JPH10255381A - Data reproduction method and apparatus - Google Patents

Abstract

(57) [Problem] To provide a CD-ROM drive device capable of rationally achieving high-speed data reproduction. SOLUTION: In order to determine a suitable maximum scanning speed suitable for a recording medium disk 4 loaded in a CD-ROM drive device, a light beam is applied to a first track while the disk 4 is rotated at a first rotation speed. From the position to the second track position, turn on the tracking servo, and
The address data at the track position of is read. It is determined whether the reading of the address data has been completed within a predetermined time (13 ms). From the first track position described above to the second
The operation of moving the light beam to the track position, that is, the seek operation, is repeated a plurality of times, and the maximum compatible scanning speed is determined based on the number of successful readings of the address data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-ROM drive or a similar data reproducing apparatus and a data reproducing method using the same.

[0002]

2. Description of the Related Art A CD-ROM uses a CD (Compact Disk) as a ROM (Read Only Memory), and is used in computer systems like a semiconductor ROM. Since high-speed processing is required in a computer system, the scanning speed (linear speed) of a CD-ROM is changed to the standard scanning speed of an audio CD (1.
Generally, it is set to several times as large as 2 to 1.4 m / s).

[0003]

SUMMARY OF THE INVENTION CD-RO
There are various types of CD-ROMs used in the M drive device, and there is a disk in which the center of the outer shape of the disk does not match the center of gravity of the disk (hereinafter, referred to as an eccentric disk). When the degree of eccentricity is low, reproduction can be performed with the scanning speed increased to about 16 times the standard scanning speed. However, when a disk with a large degree of eccentricity is scanned (rotated) at a high speed such as 16 times speed, not only vibration and noise are increased, but also seek operation and data reading may become impossible. In addition, in high-speed scanning, reading errors increase, and when re-reading (retry) is performed, high-speed reproduction performance is reduced.

An object of the present invention is to provide a method and an apparatus capable of easily executing data reproduction at a scanning speed suitable for the quality of a disk.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above-mentioned object, the present invention provides a method of recording main data with track address data in a spiral or concentric track form so as to be optically readable. A disk rotating means for rotating a recording medium disk which is formed so that the rotation speed can be changed and the disk can be removably mounted; and the track address data. A light source for projecting a light beam onto the disc to read the data and the main data, and a light source for detecting a reflected light beam obtained by reflecting the light beam on the disc, and A light detecting means for outputting an electric signal corresponding to the light; and the track address data and the front address based on the output of the light detecting means. Data reading means for reading main data, moving means for moving the light beam in the radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, In a method for reproducing data from the disk by a disk reproducing device including a tracking control unit for controlling the moving unit so as to reduce the deviation detected by the tracking state detecting unit, A second step of rotating the light beam from a first track position to a second track position in a radial direction of the disk, and And a third step of operating the tracking control means after the second step. And a fourth step of starting reading track address data indicating the second track position or its vicinity based on the output of the light detection means; and starting a tracking control operation by the tracking control means. A fifth step of judging whether or not the track address data indicating the second track position or the vicinity thereof can be read within a predetermined time; and, in the fifth step, changing the track address data within the predetermined time. When a determination result indicating that the reading has been successfully performed is obtained, the first
A determination result indicating that the main data is reproduced by rotating the disk so as to obtain a second scanning speed higher than the scanning speed, and the track address data could not be read within the predetermined time; And a sixth step of rotating the disk to reproduce the main data so that the first scanning speed or a third scanning speed lower than the first scanning speed is obtained when Related to a data reproducing method. Further, as set forth in claim 2, the seek operation comprising the second to sixth steps in the first aspect of the present invention is repeated a plurality of times, and based on the result of the plurality of seek operations, the data is read at a second scanning speed. It is desirable to determine whether to read. Further, as described in the third, fourth, or fifth aspect, the scanning speed can be determined with reference to the required time length from the start of the tracking control to the completion of the reading of the track address data. It is desirable that the first scanning speed is determined in consideration of the mechanical resonance frequency of the tracking control actuator. In addition, a data reproducing apparatus can be configured as described in claims 7 to 12 to execute the methods of claims 1 to 6.

[0006]

Action and effect of the present invention Claims 1, 2, 4, 5, 6,
According to the inventions of 7, 8, 10 and 11, the scanning speed suitable for the disc is determined in consideration of whether or not the reading of the track address data is possible within a predetermined time after the start of the tracking control. Claims 3, 4, 5,
In the inventions 9, 10, and 11, the scanning speed is determined in consideration of the required reading time length. Claims 4, 5, 10, 11
In, the scanning speed is determined in consideration of both the number of readings within a predetermined time and the required reading time length. In other words, in the invention of each claim, it is noted that in the case of an eccentric disk, the vibration of the disk increases as the rotational speed of the disk increases, and the time required for positioning the light beam on a predetermined track increases. Thus, the eccentricity of the disk is determined to determine the scanning speed. Therefore, the magnitude of the eccentricity of the disk and the vibration can be detected without providing a special vibration sensor or the like, and the maximum scanning speed (rotation speed) suitable for the disk can be easily determined. In the case of a low-quality disc having a large eccentricity or eccentricity, the main data is read at a scanning speed lower than a predetermined maximum scanning speed (allowable maximum scanning speed) of the data reproducing apparatus. However, when performing low-quality reproduction at a predetermined maximum scanning speed, a reading error occurs and the reproduction time (read time) becomes longer due to retry (rereading). Regeneration in the manner according to the invention results in shorter read times. Also,
The quality of the disk is checked at a lower first scanning speed without checking the quality such as the eccentricity of the disk at the maximum allowable scanning speed of the data reproducing apparatus. Therefore, the check processing time is shortened, and the operating period of the disk reproducing apparatus at the maximum allowable scanning speed is shortened, so that the life of the mechanical components can be extended. Further, by limiting the rotation speed of the disk having a large eccentricity, unpleasant vibration noise of the disk and the data reproducing device can be suppressed, and the failure rate of the components of the data reproducing device can be reduced. Further, adverse effects on nearby devices (for example, hard disk devices) can be suppressed. Claims 2, 5,
According to the eighth and eleventh aspects of the present invention, since the state of the disk is determined by performing the seek operation a plurality of times, the scanning speed suitable for the disk can be accurately determined. Claims 3, 4,
According to the inventions of the ninth and tenth aspects, the scanning speed suitable for the disc is determined with reference to the time required from the start of the track control to the completion of the reading of the track address data. Therefore, the appropriate scanning speed is determined accurately. Can be.
According to the sixth and twelfth aspects of the present invention, the rotation speed of the disk at which the actuator vibrates due to resonance is set as the rotation speed of the first scanning speed. A disc having a large eccentricity is greatly different from a disc having a small eccentricity, so that a disc having a large eccentricity can be easily distinguished.

[0007]

First Embodiment Next, a CD-R as a data reproducing apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
The OM drive device will be described. FIG. 1 shows a host computer 1 and a CD-ROM drive device 2. CD-RO
The M drive device 2 functions as a data supply source to the host computer 1, and both are connected by a bus 3.

The CD-ROM drive 2 includes an optical recording medium disk (CD-ROM) 4 composed of a CD, a disk rotation motor 5 as a part of disk rotation means, an optical pickup 6 as a signal converter, and an optical pickup 6 Optical pickup feeding means 7 as a moving means, motor servo circuit 8 as a part of disk rotating means, waveform shaping circuit 9, synchronization detection and demodulation circuit 10, PLL circuit 11, error detection and correction circuit 12, interface circuit 13 ,
The system includes a system controller 14 composed of a microprocessor (microcomputer) or a digital signal processing circuit, an FG (frequency signal generator) 15, a clock generator 16, a tracking servo circuit 17, and a focus servo circuit 18.

The disk (CD-ROM) 4 has a center hole 20 into which a spindle 19 coupled to the motor 5 is inserted. As shown in FIG. The track 21 has a spiral track 21. In this track 21, data is recorded in optical pits in the form of a number of data blocks in which 8 bits are 1 byte and 2352 bytes are 1 unit (1 data block). . One data block is the audio C
When the data is reproduced at the same standard speed as the scanning speed of D (1.2 to 1.4 m / s), the data is reproduced in 1/75 second. As is well known, data is recorded at a constant linear velocity, that is, CLV (Constant Linear Velocity) on CDs and CD-ROMs, and this data is reproduced by CLV. The relative scanning movement between the disk 4 and the optical pickup 6 is determined by CLV
The rotation speed of the disk 4 is reduced in accordance with the progress of the scanning from the inside of the disk 4 to the outside. Track 2
In 1, in addition to the main data, track address data generally called a subcode Q is written at predetermined intervals. The subcode Q is MIN (minute), SEC
(Second) and time information indicated by FRM (frame) indicate the position on the track.

The optical pickup 6 is a well-known one.
As illustrated in FIG. 2, for example, a laser light source 22 composed of a laser diode, a diffraction grating 22a, a beam splitter 23, a collimator lens 24 for obtaining a parallel light beam, a quarter-wave plate 25, and an objective lens 26, a cylindrical lens (a lens like a part of a cylinder) 27 disposed in the optical path of the reflected light beam, a photodetector 28, a tracking control actuator 29, and a focus control (interval control) actuator 30. Consists of

The optical pickup 6 includes a light source 22 as is well known.
The light beam emitted from the optical disk is converged by the objective lens 26 and projected on the main surface of the disk 4 to read data recorded on the disk 4 by optical pits. In this embodiment, one main beam used for reproduction and focus detection and two sub-beams used for tracking detection are formed by the diffraction grating 22a, and three beams are formed. Disc 4
To project. Since the optical pits are arranged on the tracks 21 so as to correspond to the data, when the unmodulated light beam is projected on the disk 4 as a reproduction beam, the reproduction beam is modulated by the pits (data) and enters the photodetector 28. The reflected light beam 31 becomes a modulated beam. Photodetector 28
Is a light detecting means for converting light into an electric signal,
In this embodiment, the photodetector 28 has first, second, third and fourth portions indicated by A, B, C and D in order to use the photodetector 28 for both reproduction and focus control. It has fifth and sixth parts for the tracking detection shown. Note that the dividing line directions of the first and second portions A and B and the dividing line directions of the third and fourth portions C and D indicated by arrows 32
1 corresponds to the tangential direction. The fifth and sixth portions E and F are arranged in the direction of arrow 32.

A tracking actuator 29 as tracking control means or beam shift control means is constituted by a moving coil 29a connected to the objective lens 26, a permanent magnet 29b, and a magnetic circuit forming member (not shown). This is a well-known voice coil type actuator, and is configured so that the objective lens 26 moves in a direction parallel to the main surface of the disk 4 as indicated by an arrow 33 in accordance with the current flowing through the moving coil 29a. Incidentally, the tracking actuator 29 and the objective lens 26 also function as moving means for moving the light beam in the radial direction of the disk.

A focus actuator 30 as a focus control means is a well-known voice coil composed of a moving coil 30a connected to the objective lens 26, a permanent magnet 30b, and a magnetic circuit forming member (not shown). Moving actuator 30a
The objective lens 26 is formed so as to move in a direction perpendicular to the main surface of the disk 4 as indicated by an arrow 34 in accordance with the current flowing through the disk 4. When the objective lens 26 moves in the direction of the arrow 34, the distance between the disk 4 and the objective lens 26 changes, and the focus state of the light beam spot 35 on the disk 4 changes. As described above, in this embodiment, three beams are projected on the disk 4. However, in order to simplify the drawing, FIG.
Only shown.

The tracking servo circuit 17 constituting the tracking control means shown schematically in FIG. 1 and shown in detail in FIG. 2 comprises one subtracter 38, a switch 39, and a phase compensation and drive circuit 40. The subtractor 38 subtracts the output of the sixth part of the light detector 28 from the output of the fifth part of the light detector 28. The output of the subtractor 38 is a tracking control signal, which is supplied to the tracking muching coil 29 via the switch 39 and the phase compensation and drive circuit 40. The method for obtaining the tracking control signal from the fifth and sixth portions E and F of the photodetector 28 is a three-spot method (th
ree spots method). In order to obtain a tracking control signal, a DPD (Differential Ph
Of course, another well-known method such as the ase detection method may be employed. In the case of the DPD method, the diffraction grating 22a,
The fifth and sixth portions E and F of the photodetector 28 are unnecessary. The switch 39 is turned on / off in response to a control signal on a line 41 derived from the system controller 14 in FIG. The phase compensation and drive circuit 40 is controlled by a signal on a line 41a derived from the system controller 14. The drive circuit portion of the phase compensation and drive circuit 40 is arranged on the output side, and a jumping signal (seek signal) at the time of seeking is input from the line 50. The output terminal of the subtractor 38 is connected to a feed means 7 for coarse movement (for coarse seek) through a line 51. The seek signal on the line 50 can be input to the sending means 7.

A focus servo circuit 18 which constitutes focus control means shown schematically in FIG. 1 and shown in detail in FIG.
Are two adders 42 and 43, one subtractor 44,
It comprises one switch 45 and a phase compensation and drive circuit 46. One adder 42 adds the outputs of the first and third portions A and C of the photodetector 28. The other adder 43 adds the outputs of the second and fourth parts B and D of the photodetector 28. The subtracter 44 subtracts the output of the other adder 43 from the output of one adder 42. The output of the subtractor 44 is supplied as a focus control signal to the focusing coil 30 via a switch 45 and a phase compensation and drive circuit 46. A method of obtaining a focus control signal from the first to fourth parts A to D of the photodetector 28 is based on an astigmatic method (astigmatic method).
method). The switch 45 is turned on / off in response to a control signal supplied from the system controller 14 through a line 47. The phase compensation and drive circuit 46 is controlled by a signal of a line 47a derived from the system controller 14.

The data read output is obtained by adding the outputs of the first to fourth parts A to D of the photodetector 28.
In FIG. 2, the two adders 4 of the focus servo circuit 18 are used.
An adder 48 for adding the outputs of 2 and 43 is provided, and an output line 49 of the adder 48 obtains a data read output. In FIG. 2, the outputs of the focus servo adders 42 and 43 are input to the adder 48.
Instead, an independent adder may be provided for data detection, and the outputs of the portions A to D of the first photodetector 28 may be added. Note that the connection relationship between the optical pickup 6 and the waveform shaping circuit 9, the tracking servo circuit 17, and the focus servo circuit 18 in FIG. 1 is schematically shown.
In FIG. 2, adders 42, 43 and 48, and a subtractor 3
At least some or all of 8 and 44 can be included in the optical pickup 6.

The feed means 7 shown in FIG. 1 includes a feed motor and means (for example, a pinion and a rack or a lead screw) for converting the rotational motion of the feed motor into a linear motion of the optical pickup 6. The feeder 7 passes a tracking control signal supplied from the tracking servo circuit 17 via a line 51 through a low-pass filter (LPF) to thereby displace the light spot 35 based on the spiral track 21 in the disk radial direction (DC component). And a function of gradually moving the optical pickup 6 in the radial direction of the disk 4 so as to enable scanning of the spiral track.

The output line 49 of the optical pickup 6 shown in FIG.
The waveform shaping circuit 9 connected to the amplifier amplifies a high-frequency (RF) signal corresponding to the array of optical pits obtained from the optical pickup 6 and then shapes the waveform to output a binarized signal. The well-known EFM (Eight to Fourtee)
Since the data is recorded by the modulation of the (n Modulation) method, the output of the waveform shaping circuit 9 when the data is normally read is an EFM signal.

A line 52 connected to the output line 49 of the optical pickup 6 is provided for detecting the attachment / detachment of the disk 4. The state of incidence of the reflected light beam 31 shown in FIG.
The presence or absence of the disk 4 can be detected from the output of the optical pickup 6.

The waveform shaping circuit 9 is a synchronous detection and demodulation circuit 1
0 and a PLL (Phase Locked Loop) circuit 11. The PLL circuit 11 generates a reproduced clock signal (synchronous signal) synchronized with each bit of the EFM signal obtained from the waveform shaping circuit 9. Note that the PLL circuit 11
To control the switching of the center frequency of the VCO at
The LL circuit 11 is also connected to the system controller 14.

The synchronization detection and demodulation circuit 10 detects whether the PLL circuit 11 is in a locked state, that is, the PLL circuit 1
1 detects whether or not 1 is operating in synchronization with the EFM signal, and sends a reproduction clock signal (synchronization signal) obtained from the PLL circuit 11 to the motor servo circuit 8 via a line 53 when the operation is synchronized. Further, the synchronization detection and demodulation circuit 10
When the LL circuit 11 is synchronized with the EFM signal, that is, in a locked state, the EFM signal is converted to, for example, NRZ (Non Return to Zero) by using the reproduced clock signal, ie, the synchronization signal.
o) The signal is demodulated into a digital signal and output to a line 54. The synchronization detection and demodulation circuit 10 sends a demodulated signal of an address recorded on the disk 4 together with the data block in accordance with the CD format to the system controller 14 via a line 55. The address on line 55 is used in a known manner for seeking to position the optical pickup 6 at the target address.

A well-known error detection and correction circuit 12 connected to the synchronization detection and demodulation circuit 10 detects an error in the demodulated data (reproduced data), and corrects the error if it can be corrected. I do. The error detection and correction circuit 12 is connected to the interface circuit 13 and the system controller 14. When an uncorrectable reproduction error occurs, data re-reading (retry) is executed by a known method. The waveform shaping circuit 9, the synchronization detection and demodulation circuit 10, and the error detection and correction circuit together can be called a reproduction signal processing means.

The interface circuit 13 is connected between the error detection and correction circuit 12 and the host computer 1, and is connected between the host computer 1 and the system controller 14.

Clock generator 16 is connected to system controller 14 by line 56 and
7 is connected to a motor servo circuit 8 and is connected to an error detection and correction circuit 12 by a line 58. Under the control of the system controller 14, the reference clock signal of the standard frequency f1 and the standard frequency f1 are twice, four times, and four times. 8 times and 12 times the frequencies f2, f4, f8,
Any one of the reference clock signals f12 is supplied to the motor servo circuit 8 and the error detection and correction circuit 12.

The motor servo circuit 8 includes a synchronous signal line 5
3, connected to the speed command bus 56, clock line 57, FG pulse line 59, CAV / CLV switching control line 60, and output line 61. As shown in FIG. 3, the motor servo circuit 8 includes an fv (frequency-voltage) converter 62 for CLV control, a reference voltage generator 63, an error amplifier 64, a phase comparator 65, and an adder 66. CLV consisting of
In addition to the servo circuit 8a, CAV (Constant Angular Veclo
city), that is, a CAV including an fv converter 67, a reference voltage generator 68, and an error amplifier 69 for constant rotation angle control.
It has a servo circuit 8b. The fv converter 64 in the CLV servo circuit 8a is connected to the reproduced clock signal output line 53 of the synchronization detection and demodulation circuit 10, and outputs a voltage signal corresponding to the frequency of the reproduced clock signal, that is, an fv converted output signal. To form The reference voltage generator 63 is connected to the system controller 14, for example, based on reference frequency designation data supplied from the system controller 14 via the bus 56, that is, speed command data, for example, a standard (1.2).
.About.1.4 m / s) consisting of first, second, third, fourth, fifth and sixth speed data corresponding to scanning speeds of 2, 4, 6, 10, and 16 times. 6 levels (7 including zero)
) Is selectively generated. fv converter 6
4 and an error amplifier 66 connected to the reference voltage generator 65 generate a voltage corresponding to the difference between the frequency-corresponding voltage obtained from the fv converter 64 and the reference voltage (speed command voltage), that is, a frequency error signal. . The phase comparator 65 is connected to the reproduced clock signal output line 53 of the synchronization detection and demodulation circuit 10 and the output line 57 of the clock generator 16, and outputs a voltage corresponding to the phase difference between the reproduced clock signal and the reference clock signal, that is, a phase error signal. Occurs. The adder 68 is an error amplifier 6
4 and the phase comparator 65 to form a signal obtained by adding the frequency error signal and the phase error signal, that is, a combined error signal. The fv converter 67 of the CAV servo circuit 8b is connected to the FG pulse line 59 and outputs a voltage corresponding to the frequency of the FG pulse, that is, the rotation speed of the motor 5. The reference voltage generator 68 is connected to the speed command bus 56, and generates a reference voltage corresponding to the speed commanded by the controller 14.
The error amplifier 69 generates a voltage corresponding to the difference between the output of the fv converter 67 and the output of the reference voltage generator 68. CL
A CLV servo circuit 8 is connected to one terminal 71 of a switch 70 to selectively output a V control signal and a CAV control signal.
a of the CAV servo circuit 8b is connected to the other terminal 72, and the switch 7
The 0 output terminal 73 is connected to the motor 5 via the drive amplifier 74 and the line 61. The switch 70 is controlled by a signal on a CAV / CLV switching control line 60 derived from the system controller 14.

The motor 5 has an FG (frequency signal generator) 1
The FG 15 generates a pulse at a frequency corresponding to the rotation of the motor 5. In this embodiment, when the motor 5 makes one rotation, the FG 15 generates six pulses. The FG 15 is connected to the system controller 14 and the fv converter 6 of the CAV servo circuit 8b by an output line 59.
7 is connected. The output pulse of this FG15 is CA
It is used not only for V control but also for detecting the rotational speed of the disk 4. Therefore, the FG 15 is a part of the rotation speed detecting means of the disk 4.

The system controller 14 as a reproduction control means comprises a microprocessor, and stores a CPU (central processing unit) 77, a RAM (random access memory) 78 for performing various operations, programs and tables. ROM (read only memory)
79 and operates according to the operation control program stored in the ROM 79.

FIG. 4 is a block diagram showing a part of the system controller 14 equivalently or functionally. As is apparent from FIG. 4, the system controller 14 comprises a mode switching signal generating means 80, a disk attaching / detaching detecting means 81, a speed command data generating means 82, a speed detecting means 83, a tracking and focus servo control means 84, a seek command. It has a generating means 85, an address reading circuit 86, a comparing means 87, a first counter 88, a timer 89, and a second counter 90.

The mode switching signal generating means 80 forms a signal for executing the switching between the adaptive maximum rotational speed determining mode and the data reproducing mode. The motor for the disk 4 obtained from the disk attaching / detaching detecting means 81 5 is output in response to the signal indicating the attachment to the control unit 5. The disk attachment / detachment detecting means 81 is connected to the optical pickup 6 via a line 52, and generates an output indicating the presence or absence of the disk 4 based on the output of the optical pickup 6. Mode switching signal generating means 80
Outputs a mode discrimination signal that distinguishes between the conformable maximum rotation speed determination mode and the normal data reproduction mode on line 91,
This is sent to the speed command data generating means 82 and the tracking and focus servo control means 84. The speed command data generating means 82 sequentially generates data indicating normal, double, quadruple, six-fold, ten-fold and sixteen-fold speeds in the adaptive maximum rotational speed determination mode, and determines the adaptive maximum rotational speed in the normal reproduction mode. It generates data commanding the adapted maximum rotational speed determined in the mode or a lower rotational speed.

The speed detecting means 83 is connected to the FG output line 59, and generates an output indicating the rotational speed by periodically counting the FG pulses by a built-in counter.

The tracking and focus servo control means 84 is connected to the line 4 in the adaptive maximum rotation speed determination mode.
A signal for turning off the tracking switch 39 and the focus switch 45 shown in FIG. 2 is output to the first and the 47, and the switch 3 is turned on only during the period in which the tracking and focus control is required in the normal reproduction mode period.
Signals for turning on 9 and 45 are output to lines 41 and 47. Further, the tracking and focus servo control means 84 controls the phase compensation and drive circuits 40 and 46 of the tracking and focus servo circuits 17 and 18 in FIG. 2 in response to the output of the speed detection means 83 in the normal data reproduction mode. Lines 41a, 47
a.

The mode switching signal generating means 80 outputs
The CLV switching signal is supplied to the switch 7 of FIG.
Send to 0. In the adaptive maximum rotational speed determination mode according to the present invention, a signal indicating CAV is supplied to the switch 70 via the line 60, and the second terminal 72 of the switch 70 is connected to the output terminal 73. CL in normal data playback mode
A signal for performing V control is sent to line 70,
Terminal 71 is connected to the output terminal 73.

The seek command generator 85 shown in FIG. 4 generates a seek command in the normal reproduction mode and also generates an LBA (Logical
0 minute 2 indicating the first position where Block Address) is 0
A first seek command for positioning a light beam at a track address of frame 0 second, and a second track 150 (turn 150) in an outer circumferential direction from the first position.
And a second seek command for positioning the light beam at the track address indicating the position of the light beam, and a known jumping signal of the light beam corresponding to these seek commands is formed. The light beam is supplied to the drive circuit of the tracking servo circuit 17 to move the light beam in the radial direction of the disk 4.

The address reading circuit 86 extracts the read address signal of the disk 4 obtained from the line 55, and outputs it to the seek command generating means 85 and the comparing means 8
Send to 7.

The comparing means 87 is a seek command generating means 8
5, the second seek command for 150 tracks in the above-mentioned adaptive maximum rotational speed determination mode and the reproduction address extracted by the address reading circuit 86 are compared to determine whether or not they match, and An output indicating that the address was successfully read is sometimes sent to the first counter 88. Note that, without giving the second seek command to the comparing means 87, address data in the vicinity of the track address specified by the second seek command or an address in a predetermined range including an address according to the second seek command is sent to the comparing means 87. The address reading may be completed when a read address signal corresponding thereto is obtained.

In this embodiment, the seek operation is repeated five times in order to determine the optimum maximum rotation speed. First counter 8
Reference numeral 8 denotes how many times address data has been read by five seek operations. The count value of the first counter 88 is sent to the speed command data generating means 82 in order to determine an appropriate maximum rotational speed.

The timer 89 is for limiting the time of one seek operation for determining the adaptive rotation speed. A signal for turning on the tracking control is sent to the switch 39 of FIG.
At the time when 13 ms (milliseconds) have been measured, an output indicating completion of the time measurement is generated, and one seek operation is completed.

The second counter 90 counts the number of seek operations for determining a suitable maximum rotational speed. When the timer 89 completes 13 ms, and when the comparator 87 outputs a coincidence output. Thus, when the first counter 88 is incremented, the count value of the second counter 80 is incremented. The second counter 90 is connected to a seek command generator 85 to repeat the seek operation a predetermined number of times (five times). The seek command generating means 85 repeats the seek operation by the first seek command (LBA = 0) and the second seek command (150 tracks) every time the output of the second counter 90 goes up by one stage,
This seek operation is performed up to five times.

Next, the CD-ROM drive device 2 shown in FIG. 1 will be described with reference to flowcharts for determining a suitable maximum rotation speed (scanning speed) shown in FIGS. FIG. 5 shows an overall flow chart for determining the adapted maximum rotational speed, and FIG. 6 details the operation of part of FIG. The operation of the flowchart of FIG. 5 is performed when the power of the CD-ROM drive device 2 is turned on while the disk 4 is inserted.
The process starts when the disk 4 is inserted while the power of the drive device 2 is on. For example, when the recording medium disk 4 is mounted on the spindle 19 while the power of the CD-ROM drive device 2 is turned on, this is detected by the disk attachment / detachment detecting means 81, and the maximum rotation of the disk 4 before the main data is reproduced. The speed (scanning speed) is determined, and the determination result is stored in, for example, the RAM 78 of the system controller 14 and held until the disk 4 is detached from the CD-ROM drive 2 or the power of the drive 2 is turned off. You. Therefore, even when the main data is reproduced intermittently, it is only necessary to determine the maximum rotation speed suitable for the loaded disk 4 once.

First, when a signal indicating the loading of the disk 4 is obtained from the disk attaching / detaching detecting means 81 in FIG. 4, a program for determining an allowable maximum rotational speed is started in step S0 in FIG. 5, and then in step S1. Thus, initialization (reset) of the first and second counters 88 and 90 is executed.

Next, as shown in step S2, the rotation speed of the disk 4 is set so that the scanning speed by the light beam is six times the standard speed. In this embodiment, LBA is 0
The rotation speed is set so that a scanning speed six times faster than the standard scanning speed can be obtained at the position of 0 minute 2 second 0 frame. The setting of the six-fold rotation speed is performed by the speed command data generating means 82 in FIG. At this time, the contact 72 of the switch 70 in FIG. 3 is turned on, and a 6 × speed control loop by the CAV servo circuit 86 is formed. CD of this embodiment
-In the ROM drive device 2, the mechanical system including the tracking actuator 29, the focus actuator 30, and the objective lens 26 resonates based on the vibration generated by rotating the disk 4 at 6 times speed. In other words, the disk rotation speed that can cause resonance in the mechanical system is defined as the rotation speed of the disk 1 at the time of determining the appropriate maximum rotation speed. FIG. 7 illustrates the resonance at 6 × speed. The horizontal axis in FIG. 7 indicates the double speed of the rotation speed of the disk 4, and the vertical axis indicates the relative speed of the light beam to the disk 4 in the radial direction of the disk 4. That is, the disk 4 also vibrates in the radial direction of the disk 4 due to the eccentricity, and the light beam also vibrates due to the vibration of the objective lens 26. Therefore, the vertical axis of FIG. This indicates a difference from the above. When the relative speed of the light beam in the radial direction of the disk 4 is high, it is difficult to lock the tracking servo. When the relative speed of the light beam in the radial direction of the disk is large, the deviation amount of the light beam from a predetermined track is generally large. In FIG. 7, a characteristic line A indicates the characteristics of a disk having substantially no eccentricity, and a characteristic line B indicates the characteristics of a disk having an eccentricity. Regardless of the magnitude of the eccentricity, the relative speed of the light beam to the disk 4 increases as the rotational speed of the disk increases. At the 6 × speed at which the mechanical system resonates, the relative speed of the light beam increases at both characteristic lines A and B. However, the relative speed of the light beam at or near the resonance point at 6 × speed is greater for a disk having an eccentricity than for a disk having no eccentricity. Accordingly, the difference between the relative velocities of the light beams at the 6 × speed (resonance point) in the characteristic lines A and B is larger than the difference between the relative velocities at the non-resonance point near the 6 × speed, and the magnitude of the eccentricity is discriminated. Becomes easier.

Next, as shown in step S3, it is determined whether or not the rotation speed of the disk 4 has become six times as high. The determination of the 6 × speed is performed by the seek command generating means 85 of FIG. Of course, an independent 6 × speed judging means can be provided between the speed detecting means 83 and the seek command generating means 85 in FIG.

If an output of YES indicating that the speed has been increased to 6 times is obtained in step S3, the predetermined seek operation is repeated five times in step S4. FIG. 6 shows the predetermined seek operation in step S4 of FIG. 5 in detail.

If it is determined in step S3 of FIG. 5 that the speed has become six times as fast, in response to this, the operation shifts to the operation of step S41 in FIG. The light beam is positioned at the track address. The positioning of the light beam to the first track address is achieved by generating a first seek command from the seek command generating means 85 of FIG. In this embodiment, the seek reference position is set to 0 minute, 2 second, 0 frame of LBA = 0, but may be an arbitrary track address such as 1 or 2 of LBA.

Even if the seek operation to LBA = 0 is executed, the light beam is not immediately positioned at LBA = 0. Therefore, a wait (wait time) of 150 ms is set as shown in step S42. After the elapse of 150 ms, the objective lens 26 becomes the operation center position, and the light beam is located substantially at the center of the track.

Next, as shown in step S43, the light beam jumps toward the outer periphery of 150 tracks (turns).
That is, a jumping signal is generated from the seek command generating means 85 of FIG. The voltage is applied to the moving coil 29a via the drive circuit portion of the drive circuit 40.

Next, as shown in step S44, 35 ms
Set the weight (waiting time) of. This weight is for facilitating discrimination between a disk having a small eccentricity and a disk having a large eccentricity, and is a waiting time until the tracking servo circuit 17 is turned on. The wait time in step S44 is determined so as to be compatible with the mechanical system of the tracking actuator 29 and the objective lens 26. FIG. 8 shows a change in the relative speed of the light beam during a seek. 8, the horizontal axis represents time, and the vertical axis represents the relative speed of the light beam to the disk in the disk radial direction, as in FIG. If a jumping signal of 150 tracks is generated at 0 ms in FIG. 8, the deflection of the objective lens 26 in the disk radial direction occurs, and the light beam also shifts in the disk radial direction at the same time. 150 for discs with no eccentricity
The displacement of the light beam based on the displacement of the objective lens 26 caused by the track jumping signal causes the relative speed of the light beam to change as shown by the characteristic line C in FIG. When the objective lens 26 is displaced so as to move the light beam by 150 tracks, the light beam vibrates based on the free vibration of the mechanical system of the objective lens 26 and the actuator 29, and the relative speed of the light beam periodically changes. . When the relative speed of the light beam on the characteristic line C falls below the tracking servo pull-in possible level L, the switch 3 in FIG.
When 9 is turned on, the locked state of the tracking servo is immediately established. The wait time of 35 ms in step S44 of this embodiment is determined in consideration of the servo lock. The change of the characteristic line C in FIG. 8 is not fixed but changes depending on the characteristics of the actuator of the drive device 2. A characteristic line D in FIG. 8 shows a change in the relative speed of the light beam based on a jump operation of 150 tracks on a disc having a center of gravity. When an eccentric disk is used, the disk 4 vibrates, and this vibration extends to the mechanical systems of the tracking actuator 29, the focus actuator 30, and the objective lens 26. As a result, 15
The vibration based on the center of gravity is added to the change due to the original deviation of the objective lens 26 for the jumping of the zero track,
The relative speed of the light beam becomes higher than the tracking servo pull-in possible level L as shown by the characteristic line D in FIG.
The time required for this to converge to a value lower than level L is 3
It is longer than 5 ms.

Next, as shown in step S45, a command for turning on the tracking servo circuit 17 is shown in FIG.
Is issued from the tracking and focus servo control means 84, and is sent to the switch 39 via the line 41 to start the tracking servo.

Next, in step S46, it is determined whether or not the address data of 150 tracks has been read. As described with reference to FIG. 8, the relative speed and the vibration width of the light beam in the radial direction of the disk change depending on the degree of eccentricity. 3 in FIG.
At 5 ms, the tracking servo is turned on, and after a while, the relative speed of the light beam becomes equal to or lower than the drawable level L. The locked state of the tracking servo is established, and the track address data of the disk can be read. In this embodiment, in order to determine the degree of eccentricity, the address reading ends at 48 ms, which is 13 ms after the tracking servo ON time (35 ms). In order to execute this, the time length during which the output of NO indicating that the address could not be read from step S46 is obtained is 1
It is determined in step S47 whether or not the time is 3 ms or longer. Whether the address has been read or not is determined by the timer 89 shown in FIG.
This is performed by the comparing means 87 to which time information of 3 ms is given. That is, when an output indicating that the detected address obtained from the address reading circuit 86 matches the address of 150 tracks generated by the seek command generating means 85 is obtained, the comparing means 87 outputs an output indicating that the address has been read. Occur. Even if the jump of 150 tracks is executed in step S43, the optical beam may not be accurately positioned on 150 tracks. In this case, in step S46, an address near 150 tracks is read first. Therefore, a jump signal for moving the light beam to 150 tracks is given to the coil 29a. This makes it possible to read the address of 150 tracks. Instead of determining whether or not the address of the 150 track could be read in step S46 in this manner, it is determined in step S46 whether or not the address near the 150 track could be read.
An output of YES or NO can also be generated. Fifteen
Since there is not much difference between the time to read the address of track 0 and the time to read the address in the vicinity of track 150, there is no substantial difference even if any of the above two methods is adopted in the determination in step S46. When a YES output indicating that the address has been read is generated in step S46, the count value of the first counter 88 in FIG. 4 increases by one step. Further, the timer 89 for 13 ms is reset.

When a YES output indicating that the address could not be read occurs between step S47 and 13 ms,
That is, when a timer output of 13 ms is generated from the timer 89, and when the first counter 88 is incremented by one in step S48, the second counter 90 is incremented by one in step S49. The second counter 90 counts the number of executions of the seek operation.

In step S50, the seek operation is 5
It is determined whether the process has been repeated a number of times. That is, whether or not the count value of the second counter 90 indicates five times is determined by the seek command generating means 85, and when the output of NO indicating that the five times is not completed is obtained, step S41 is performed. And the same seek operation as described above is repeated again. The address is read at most five times by repeating these five seeks. However, if the disc 4 is of low quality, it may not be read even once. Therefore, the value of the first counter 88 in step S48 falls within the range of 0 to 5 times after the completion of the five seek operations.

After the above-mentioned five seek operations are completed, the flow shifts to step S5 in FIG.
Is determined to be 4 or more. If a YES output indicating 4 or more is obtained in step S5, this is used as a signal indicating that the disc can be scanned at 16 times speed (second scanning speed), and the speed command data shown in FIG. The generation means 82 generates 16-times speed command data, and the reproduction of the main data by the 16-times speed operation is started as shown in step S6. The signal indicating that scanning at 16 times speed is possible, that is, the maximum compatible scanning speed, is a signal indicating that the disc 4 is a CD-ROM.
It is held in the memory until it is detached from the ROM drive device 2. When an output of NO indicating that the value of the first counter 88 is smaller than 4 is obtained in step S5, this is used as a signal indicating that the disk has a large eccentricity, and in step S7, the quadruple speed scanning is performed. The main data is commanded to be reproduced by the speed (rotational speed), and the reproduction by this is started. Note that the quadruple speed command signal, that is, the signal indicating that the disc is unsuitable for 16x speed, is the maximum compatible speed of the loaded disc.
It is held in the memory until it is detached from the drive device 2. After the 16 × speed or the 4 × speed is set in steps S6 and S7, the discrimination operation of the eccentric disk is terminated in step S8.

As is clear from the above, this embodiment has the following effects. (1) An eccentric disk can be easily identified without using a special vibration sensor, and a scanning speed suitable for the mounted disk can be easily determined. (2) Since the eccentricity of the disc is determined at 6 × speed lower than the maximum scanning speed (16 × speed) of the CD-ROM drive device 2, the eccentricity can be determined quickly.
That is, since the 6 × speed is an intermediate stage for the 16 × speed, the 6 × speed can be obtained in a shorter time than the 16 × speed, and the determination can be made at an earlier opportunity. In addition, when the eccentricity is determined at 16 × speed, the rotation speed is high, so that the life of the drive mechanism components is shortened. However, when the determination is performed at 6 × speed, there is little problem of this kind. (3) Since the 6 × speed at which mechanical resonance of the actuator is generated is used as the scanning speed for determining the eccentricity, the magnitude of the eccentricity can be clearly distinguished. (4) Even if the maximum speed of the drive device 2 is 16 times, in the case of a disk with a large eccentricity, the disk 4 is rotated at a lower speed, so that not only unpleasant noise can be suppressed but also data Read errors are reduced, resulting in shorter read times. (5) Since the eccentricity is determined by repeating the seek operation a plurality of times (five times), the determination accuracy is increased.

[0054]

Second Embodiment Next, a CD-ROM drive device according to a second embodiment will be described with reference to FIGS. However,
The overall configuration of the CD-ROM drive is substantially the same as that of the CD-ROM drive 2 of the first embodiment shown in FIG. Only the difference from the first embodiment is that the CD-ROM of the second embodiment is different from the first embodiment.
Illustration of the entire configuration of the ROM drive device is omitted, and FIG. 1 is referred to for the entire configuration. FIG. 9 shows a part of the system controller 14a of the second embodiment in the same manner as FIG. In FIG. 9, substantially the same parts as those in FIG. The flowcharts of the second embodiment shown in FIGS. 10 and 11 are partially modified from the flowcharts of FIGS. 5 and 6 showing the first embodiment. The same steps are denoted by the same reference numerals and description thereof will be omitted.

The system controller 14a of the second embodiment shown in FIG. 9 is different from the system controller 14 of the first embodiment of FIG.
And the timer 89 of 13 ms is replaced with the timer 8 of 28 ms.
The configuration is substantially the same as that of FIG. 4 except that the configuration is changed to 9a. The time counter 92 is connected to the tracking and focus servo control means 84, the comparing means 87 and the 28 ms timer 89a, and is generated at the time of the tracking servo start signal generated from the tracking and focus servo control means, that is, at the time of 35 ms in FIG. In response to the signal for turning on the switch 39 in FIG. 2, the time measurement is started, and the time until the output indicating that the address has been read from the comparing means 87 is generated. Note that the time counter 92 is stopped by the output of the timer 89 when the output indicating the address reading is not generated from the comparing means 87 even if 28 ms has elapsed from the start of the tracking servo, and the clocking of 28 ms is invalidated. The time counter 92 outputs the total (integrated value) of the required reading time when reading is successful during five seek operations. The speed determining means 93 is connected to the first counter 88 and the time counter 92, and calculates an average reading time T by dividing the total required reading time by the number of successful readings, and FIG.
2 is included. The table 12 in FIG. 12 shows the average reading time T and the scanning speed (rotation speed) corresponding thereto.
Is stored. When the average reading time T is determined, the speed determining means 93 sends data indicating the scanning speed suitable for the average reading time T to the speed command data generating means 82.

Next, the system controller 1 shown in FIG.
FIG. 10 shows the operation of the CD-ROM drive device having
And the flowchart of FIG. FIG. 10 shows the second
The operation of the CD-ROM drive device of the embodiment is shown in the same manner as in FIG. 5, and FIG. 11 shows the details of step S14 in which the seek operation is repeated five times in FIG. 10 as in FIG. FIG.
Steps S10, S12, S13 and S20 of 0 are substantially the same as steps S0, S2, S3 and S8 of FIG. FIG.
A step S11 of 0 initializes the first and second counters 88 and 89 and a time counter 92 at the same time as the step S1 of FIG. Step S14 in which the seek operation is repeated five times in the second embodiment includes the steps of the flowchart shown in FIG. Step S41 in FIG.
Steps S42, S43, S44, S45, S46, S48, S49 and S50 are substantially the same as the steps indicated by the same reference numerals in FIG. The flowchart of FIG. 11 differs from the flowchart of FIG. 11 in that step S51 indicated by the time counter + X is newly provided.
It is the same as FIG. 6 except that the timeout time is changed to 28 ms at 47 '.

In step S47 ', the maximum time length for judging whether or not an address has been read is set to 1 in the first embodiment.
The reason for changing from 3 ms to 28 ms is to increase the number of readable addresses. The newly provided step S51 is arranged next to step S48 of the first counter + 1. Step S51 is the time counter 9 of FIG.
2 is a step of measuring the time required for address reading by the second method. X shown in step S51 is the time required for one address reading. Therefore, in step S51, the total value (integrated value) of the address reading required times for a plurality of times is obtained.

When step S14 in which the seek operation is repeated five times is completed, it is determined in step S15 in the flowchart of FIG. 10 whether the value of the first counter 88 is 0 or not.
When the output of YES indicating that the value of the first counter 88 is 0 is obtained in step S15, the process proceeds to step S16.
Outputs a signal indicating that an error has occurred, and interrupts data reading. When a NO output indicating that the value of the first counter 88 is not zero is obtained in step S15, it is determined in step S17 whether the value of the first counter 88 is 3 or less. If a YES output indicating 3 or less is obtained in step S17, the adaptive maximum scanning speed is set to double speed in step S18, and main data is read at this speed. Also, in step S17, if the value of the first counter 88 is not smaller than 3, ie, 4
When an output indicating the above is obtained, the process proceeds to the next step S19.

In step S19, an appropriate maximum scanning speed (rotation speed) is determined with reference to the table shown in FIG. That is, the integrated value of the time counter 92 obtained in step S51 is divided by the integrated number of the first counter 88 obtained in step S48 of the flowchart of FIG. The speed shown in the table of FIG. 12 is read using T as an address, and this is set as the maximum applicable scanning speed of the disk. The speed determination in step S19 is executed by the speed determination means 93 in FIG. The data of the adaptive maximum scanning speed determined in step S19, the error data in step S16, and the data indicating the double speed in step S18 are held in the memory until the disk 4 is detached, and then the check of the eccentric disk is performed in step S20. The process ends. When the maximum scanning speed suitable for the disk 4 mounted on the CD-ROM drive device is determined in step S19, thereafter, the main data is reproduced from the disk 4 at a scanning speed within a range not exceeding the maximum speed.

The second embodiment has the same functions and effects as those of the first embodiment, and also has the functions and effects based on the time counter 92. That is, the required reading time is measured by the time counter 92, and the scanning speed is determined based on the measured time. Therefore, the maximum applicable scanning speed can be more accurately determined.

[0061]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) The CAV servo circuit 8b shown in FIG.
The disk 4 can be rotated only by the V servo circuit 8a. (2) The photodetector 28 can be divided into two parts. (3) The present invention is not limited to a reproducing apparatus using an optical disk, but is also applicable to a magnetic disk reproducing apparatus. (4) A playback device that reads a disk recorded by CAV with CAV servo, and a disk that is recorded by CLV
The present invention can also be applied to a playback device that reads in V. (5) A part or all of the speed detecting means 83 and the disk attaching / detaching detecting means 81 shown in FIGS.
It can be provided independently outside of 4 or 14a. (6) A light-emitting element and a light-receiving element are provided as means for detecting attachment / detachment of the disk, and the light from the light-emitting element is projected onto the disk, and the presence or absence of the reflected light can be detected by the light-receiving element. (7) Instead of performing a seek by a jumping pulse of 150 tracks, an optical beam is sent at high speed to or near 150 tracks (desired track) by the feeding means in FIG. The lens 26 can be used to make a jump to the desired track to accurately position the light beam at the center of the desired track. That is, the light beam can be positioned at a desired track by a combination of the coarse seek and the fine seek. In this case, after the light beam is jumped by the fine seek, the tracking servo is turned on, and whether the address data has been read within a predetermined time with reference to the starting time of the tracking servo being turned on. Determine whether or not. In short, the tracking servo ON point of the fine seek can be made to correspond to the tracking servo ON point after the jumping of 150 tracks of the embodiment is completed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a computer system including a CD-ROM drive device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a disk, an optical pickup, a tracking servo circuit, a focus servo circuit, and a read output circuit of FIG.

FIG. 3 is a circuit diagram showing the motor servo circuit of FIG. 1 in detail.

FIG. 4 is a block diagram equivalently showing an apparatus for determining an adaptive maximum scanning speed in the system controller of FIG. 1;

FIG. 5 is a flowchart showing an operation of determining a suitable maximum scanning speed by the system controller of FIG. 1;

FIG. 6 is a flowchart showing a part of FIG. 5 in detail.

FIG. 7 is a diagram showing a relationship between a rotation speed of a disk and a vibration speed of a light beam.

FIG. 8 is a diagram illustrating a relationship between a lapse of time during a seek and a vibration speed of a light beam.

FIG. 9 is a block diagram equivalently showing a part of a system controller of the CD-ROM drive device of the second embodiment.

FIG. 10 is a flowchart showing an adaptive scanning speed determination according to the second embodiment.

FIG. 11 is a flowchart showing a part of FIG. 10 in detail.

FIG. 12 is a diagram showing the contents of a table in the second embodiment.

[Explanation of symbols]

 4 Disc (CD-ROM) 5 Motor 6 Optical Pickup 8 Motor Servo Circuit 88 First Counter 90 Second Counter 92 Time Counter

Claims (12)

[Claims] An apparatus for rotating a recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. A disk rotating means formed so that the disk can be removably mounted thereon; and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. A method for reproducing data from the disk by a disk reproducing apparatus having a tracking control means for controlling the moving means as described above, wherein a first step of rotating the disk so as to obtain a first scanning speed A second step of controlling the moving means to move the light beam from a first track position to a second track position in a radial direction of the disk; and the tracking control after the second step. A third step of starting the operation of the means, and the second step based on an output of the light detecting means. A fourth step of starting to read track address data indicating a track position or its vicinity, and a track indicating the second track position or its vicinity within a predetermined time after starting the tracking control operation by the tracking control means. A fifth step of determining whether or not the address data has been successfully read; and a determination result indicating that the track address data has been successfully read within the predetermined time is obtained in the fifth step. The disk is rotated so that the second scanning speed higher than the first scanning speed is obtained, the main data is reproduced, and the track address data cannot be read within the predetermined time. When the determination result shown is obtained, the first scanning speed or the third scanning speed lower than the first scanning speed Data reproducing method, wherein a sixth and a step of said rotating disc for reproducing the main data so. 2. A method for rotating a recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. A method for reproducing data from the disk by a disk reproducing apparatus having a tracking control means for controlling the moving means as described above, wherein a first step of rotating the disk so as to obtain a first scanning speed A second step of controlling the moving means to move the light beam from a first track position to a second track position in a radial direction of the disk; and the tracking control after the second step. A third step of starting the operation of the means, and the second step based on an output of the light detecting means. A fourth step of starting to read track address data indicating a track position or its vicinity, and a track indicating the second track position or its vicinity within a predetermined time after starting the tracking control operation by the tracking control means. A fifth step of determining whether or not the address data could be read; and a step of determining whether the track address data could be read in the fifth step by the first counter. A sixth step of increasing the count value by one step and not updating the count value of the first counter when a determination result indicating that the reading could not be performed is obtained, and the second, third, fourth, The seek operation including the fifth and sixth steps is repeated a predetermined number of times, and the number of times of the repetition is counted by a second counter. And after the repetition of the predetermined number of times of the seek operation, it is determined whether or not the output of the first counter is equal to or more than a predetermined value set to be equal to or less than the number of times of the seek operation. And when the value of the first counter is determined to be equal to or greater than the predetermined value in the eighth step, the disc is controlled to have a second scanning speed higher than the first scanning speed. And rotating the disk so as to be the first scanning speed or a third scanning speed lower than the first scanning speed when it is determined that the value of the first counter is not more than the predetermined value. And a ninth step of reading data. 3. A rotating recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. A method for reproducing data from the disk by a disk reproducing apparatus having a tracking control means for controlling the moving means as described above, wherein a first step of rotating the disk so as to obtain a first scanning speed A second step of controlling the moving means to move the light beam from a first track position to a second track position in a radial direction of the disk; and the tracking control after the second step. A third step of starting the operation of the means, and the second step based on an output of the light detecting means. A fourth step of starting to read track address data indicating the track position or its vicinity, and reading the track address data indicating the second track position or its vicinity from the time when the tracking control operation by the tracking control means is started. A fifth step of measuring a time length up to a given time point, and determining a scanning speed suitable for the disk with reference to the time length, rotating the disk so as to have the suitable scanning speed, and And a sixth step of reproducing main data. 4. A rotating recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. A disk rotating means formed so that the disk can be removably mounted thereon; and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. A method for reproducing data from the disk by a disk reproducing apparatus having a tracking control means for controlling the moving means as described above, wherein a first step of rotating the disk so as to obtain a first scanning speed A second step of controlling the moving means to move the light beam from a first track position to a second track position in a radial direction of the disk; and the tracking control after the second step. A third step of starting the operation of the means, and the second step based on an output of the light detecting means. A fourth step of starting to read track address data indicating a track position or its vicinity, and a track indicating the second track position or its vicinity within a predetermined time after starting the tracking control operation by the tracking control means. A fifth step of determining whether or not the address data has been successfully read; and the track address data indicating the second track position or its vicinity from the time when the tracking control operation is started in the fifth step is A sixth step of measuring a required read time length up to a point in time when the track is read; and a fifth step in which a determination result indicating that the track address data has been read within the predetermined time is obtained. Referring to the required reading time length, the first scanning speed A high second scanning speed was determined, and the main data was reproduced by rotating the disk so as to obtain the second scanning speed, and the track address data could not be read within the predetermined time. And a sixth step of rotating the disk to reproduce the main data so that the first scanning speed or the third scanning speed lower than the first scanning speed is obtained when a determination result indicating the above is obtained. A data reproducing method, characterized in that: 5. A rotating recording medium disk in which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. A method for reproducing data from the disk by a disk reproducing apparatus having a tracking control means for controlling the moving means as described above, wherein a first step of rotating the disk so as to obtain a first scanning speed A second step of controlling the moving means to move the light beam from a first track position to a second track position in a radial direction of the disk; and the tracking control after the second step. A third step of starting the operation of the means, and the second step based on an output of the light detecting means. A fourth step of starting to read track address data indicating the track position or its vicinity, and reading the track address data indicating the second track position or its vicinity from the time when the tracking control operation by the tracking control means is started. A fifth step of measuring a time length up to the time point obtained, and reading track address data indicating the second track position or its vicinity within a predetermined time after starting the tracking control operation by the tracking control means. A sixth step of determining whether or not the track address data has been read in the sixth step; when a determination result indicating that the track address data has been successfully read is obtained, the count value of the first counter is incremented by one. And a judgment result indicating that it could not be read was obtained. A seek operation consisting of a seventh step in which the count value of the first counter is not updated, and a seek operation comprising the second, third, fourth, fifth, sixth and seventh steps are repeated a predetermined number of times. An eighth step of counting the number of times of the seek operation by a second counter, and after the end of the repetition of the predetermined number of times of the seek operation, the output of the first counter is set to be equal to or less than the number of times of the seek operation. A ninth step of determining whether the value is equal to or greater than a value, and when the value of the first counter is determined to be equal to or greater than the predetermined value in the ninth step, the seek operation of the predetermined number of times is performed. Determining a scanning speed suitable for the disc by referring to the total of the time lengths measured in the fifth step or the average value of the time lengths, reproducing the main data at this scanning speed; of When it is determined in step that the value of the first counter is smaller than the predetermined value, a tenth step of reproducing the main data at the first scanning speed or at a second scanning speed lower than the first scanning speed. Provided data reproduction method. 6. The light source has an objective lens for projecting the light beam onto the disk, the moving means has an actuator for displacing the objective lens in a radial direction of the disk, 6. The data reproducing method according to claim 1, wherein the first scanning speed is set to a value that can cause resonance in the actuator. 7. A rotating recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. Tracking control means for controlling the moving means, and controlling the rotating means so as to obtain a first scanning speed of the disk, and applying the light beam to a first track position in a radial direction of the disk. From the second track position to the second track position, to start the operation of the tracking control means, and within a predetermined time from the start of the tracking control operation by the tracking control means, the second track It is determined whether or not the track address data indicating the position or the vicinity thereof has been read, and When a determination result indicating that the rack address data could be read within the predetermined time is obtained, a second scanning speed higher than the first scanning speed is set to a scanning speed suitable for the disk, and When a determination result indicating that the address data could not be read within the predetermined time is obtained, the first scanning speed or a third scanning speed lower than this is set as a scanning speed suitable for the disk. A data reproducing device comprising: a scanning speed determining unit. 8. A rotating recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. Tracking control means for controlling the moving means, and controlling the rotating means so as to obtain a first scanning speed of the disk, and applying the light beam to a first track position in a radial direction of the disk. From the second track position to the second track position, to start the operation of the tracking control means, and within a predetermined time from the start of the tracking control operation by the tracking control means, the second track It is determined whether or not the track address data indicating the position or the vicinity thereof has been read, and When a determination result indicating that the rack address data could be read was obtained, the count value of the first counter was increased by one step, and when a determination result indicating that the rack address data could not be read was obtained, the first counter was read. The control for moving the light beam to the second track position without updating the count value of the counter, the control for operating the tracking control means, the determination as to whether or not the track address data could be read, and the A series of seek operations consisting of counting by a counter of 1 are repeated a predetermined number of times, and the number of repetitions of the seek operation is counted by a second counter;
After the repetition of the predetermined number of times of the seek operation is completed, it is determined whether or not the first counter is equal to or more than a predetermined value set to be equal to or less than the number of repetitions of the seek operation. When it is determined that the value is equal to or greater than the predetermined value, a second scanning speed higher than the first scanning speed is set to a scanning speed suitable for the disk, and the value of the first counter is not equal to or greater than the predetermined value. A scanning speed determining means for setting the first scanning speed or a third scanning speed lower than the first scanning speed to a scanning speed suitable for the disc. 9. A method for rotating a recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving in a radial direction of the disk, tracking state detecting means for detecting a deviation between the light beam and a track on the disk, and reducing the deviation detected by the tracking state detecting means. Tracking control means for controlling the moving means, and controlling the rotating means so as to obtain a first scanning speed of the disk, and applying the light beam to a first track position in a radial direction of the disk. To move to the second track position, to start the operation of the tracking control means, and based on the output of the light detection means, the track address indicating the second track position or its vicinity. Start reading data and start tracking control by the tracking control means. Scanning speed determination means for measuring a time length up to a point in time when track address data indicating the second track position or its vicinity is read, and determining a scanning speed suitable for the disk by referring to the time length. Data playback device. 10. A rotating recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving the disc in a radial direction; tracking state detecting means for detecting a deviation between the light beam and a track on the disk; and reducing the deviation detected by the tracking state detecting means. Tracking control means for controlling the moving means, and controlling the rotating means so as to obtain a first scanning speed of the disk, and applying the light beam to a first track position in a radial direction of the disk. To move to the second track position, to start the operation of the tracking control means, and based on the output of the light detection means, the track address indicating the second track position or its vicinity. At a predetermined time after data reading is started and the tracking control operation by the tracking control means is started. It is determined whether or not the track address data indicating the second track position or the vicinity thereof can be read within the interval, and the second track position or the vicinity indicating the second track position or the vicinity from the time when the tracking control operation is started. The required read time length up to the point where the track address data is read is measured, and when a determination result indicating that the track address data was successfully read within the predetermined time is obtained, refer to the required read time length. Then, a second scanning speed higher than the first scanning speed is determined as a scanning speed suitable for the disk, and a determination result indicating that the track address data could not be read within the predetermined time is obtained. When obtained, the first scanning speed or a lower third scanning speed.
A data reproducing apparatus comprising: a scanning speed determining means for determining a scanning speed of the disk as a scanning speed suitable for the disk. 11. A rotating recording medium disk on which main data is recorded in a spiral or concentric track form so as to be optically readable together with track address data, and the rotation speed can be changed. Disk rotating means formed so that the disk can be removably mounted, and a light source for projecting a light beam onto the disk to read the track address data and the main data. A light detection unit for detecting a reflected light beam obtained by the light beam being reflected by the disk, and outputting an electric signal corresponding to incident light; and an output of the light detection unit. Data reading means for reading the track address data and the main data based on the light beam; Moving means for moving the disc in a radial direction; tracking state detecting means for detecting a deviation between the light beam and a track on the disk; and reducing the deviation detected by the tracking state detecting means. Tracking control means for controlling the moving means, and controlling the rotating means so as to obtain a first scanning speed of the disk, and applying the light beam to a first track position in a radial direction of the disk. To move to the second track position, to start the operation of the tracking control means, and based on the output of the light detection means, the track address indicating the second track position or its vicinity. From the time when the data reading is started and the tracking control operation by the tracking control means is started. The time length up to the point at which the track address data indicating the second track position or its vicinity is read is measured by a timer counter, and the second control is performed within a predetermined time from the start of the tracking control operation by the tracking control means. It is determined whether or not the track address data indicating the track position or the vicinity thereof could be read, and when a determination result indicating that the track address data could be read was obtained, the count value of the first counter was determined. Control to move the light beam to the second track position while maintaining the count value of the first counter at the previous value when a determination result indicating that reading could not be performed is obtained. And controlling the tracking control means to operate and determining whether or not the track address data has been successfully read. A series of seek operations consisting of counting by the first counter is repeated a predetermined number of times, and the number of times of this repetition is counted by a second counter. After the repetition of the predetermined number of times of the seek operation, the first counter It is determined whether or not the output of the first counter is equal to or more than a predetermined value set to be equal to or less than the number of repetitions of the seek operation, and when it is determined that the value of the first counter is equal to or more than the predetermined value, the predetermined A scan speed suitable for the disk is determined by referring to the total of the time lengths measured by the timer counter or the average value of the time lengths in the seek operation of the number of times, and the value of the first counter is the predetermined value. Scanning speed determining means for determining the first scanning speed or the second scanning speed lower than the first scanning speed as a scanning speed suitable for the disk when it is determined that the scanning speed is lower than the first scanning speed. For example was the data reproducing apparatus. 12. The light source has an objective lens for projecting the light beam onto the disk, the moving means has an actuator for displacing the objective lens in a radial direction of the disk, 10. The first scanning speed is set to a value that can cause resonance in the actuator.
Or the data reproducing device according to 10 or 11.