JPH1027355A - Recording medium recording / reproducing apparatus and recording medium recording / reproducing method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To record or reproduce information on or from a disk from which a high recording density and a high quality address signal can be obtained. SOLUTION: When exchanging a disk D2 in which sectors formed in the order of address pits P2, grooves G2 and lands L2 are formed on one spiral from the inner periphery to the outer periphery, the land L2 of the disk D2 or Tracking is performed only on the address pit P2 and the groove G2. Then, the boundary between the land L2 and the address pit P2 is detected using the track jump that occurs at this time, and this timing is stored using a predetermined pulse signal. Next, at the time of recording or reproducing information on the disk D2, the focus bias and the polarity of the tracking error signal are controlled at the timing of the boundary between the stored land L2 and the address pit P2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium recording / reproducing apparatus and a recording medium recording / reproducing method. When recording or reproducing information on or from a recording medium disposed on a single spiral continuous with the recording medium, a concave portion (address pit and groove) and a convex portion are formed by using a pulse signal corresponding to the rotation of the recording medium. The present invention relates to a recording medium recording / reproducing apparatus and a recording medium recording / reproducing method in which the polarity of a tracking error signal and the bias of a focus error signal at a boundary of (land) are switched to appropriate values.

[0002]

2. Description of the Related Art In recent years, it has been proposed to record data on both lands and grooves in order to realize a higher density disk.

FIG. 6 shows an example of the configuration of a disk D1 on which data is recorded on both the land L1 and the groove G1. In the disk D1 shown in FIG.
Information is recorded on both the disc G1 and the groove G1.
1 and grooves G1 are alternately arranged. That is,
The land L1 and the groove G1 each constitute one spiral.

FIG. 7 is a view showing a state where a part of the disk D1 is enlarged. FIG. 8 shows the state of FIG. 7 as viewed from above FIG. As shown in FIG. 7 and FIG. 8, the address pit P1 is composed of the land L1 and the groove G1.
Are formed between the parts constituted by. As shown in FIG. 8, the address pits P1 are formed in a portion between the tracks.

[0005] By configuring the disk in this manner, a disk with higher density can be realized as compared with a case where information is recorded only in the groove G1.

[0006]

The land L1
When recording and reproducing information on and from the disk D1 in which the and the groove G1 constitute separate spirals, it is necessary to appropriately select the tracks of the land L1 and the groove G1 (perform a track jump).

However, in such a case, in order to continuously record and reproduce data, it is necessary to perform a track jump from the end point (outermost circumference) of the land L1 to the start point (innermost circumference) of the groove G1. There was a problem that became complicated. Further, during the track jump, information cannot be recorded or reproduced, so that there is a problem that efficient recording or reproduction cannot be performed.

Further, as shown in FIG. 8, the address pits P1 are arranged between tracks. Therefore, since the signal reproduction is performed using a part of the spot, there is a problem that the SN ratio of the reproduction signal is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and it is possible to obtain a high-quality address signal and efficiently record or reproduce information on both lands and grooves efficiently and continuously. It is made possible.

[0010]

According to a first aspect of the present invention, there is provided a recording medium recording / reproducing apparatus for generating a pulse signal corresponding to the rotation of a recording medium, and for tracking an address pit and a groove or a land. Second generation means for generating a jump signal corresponding to a track jump using a tracking error signal generated by performing
Counting means for storing a timing at which a jump signal is generated, counting a pulse signal, and outputting a switching signal indicating a boundary between a land and an address pit or a boundary between a groove and a land in accordance with the counted value of the pulse signal; And a control unit for controlling at least one of tracking and focusing in response to a switching signal when recording or reproducing information on or from a recording medium.

According to a fourth aspect of the present invention, there is provided a recording medium recording / reproducing method which generates a pulse signal corresponding to the rotation of a recording medium and uses a tracking error signal generated by performing tracking on address pits and grooves or lands. A jump signal corresponding to a track jump is generated, a timing at which the jump signal is generated is stored, a pulse signal is counted, and a boundary between a land and an address pit or a groove and a land is recorded in accordance with the counted value of the pulse signal. And outputting at least one of tracking and focusing in response to the switching signal when recording or reproducing information on or from a recording medium.

In the recording medium recording / reproducing apparatus according to the first aspect, the first generating means generates a pulse signal corresponding to the rotation of the recording medium, and the second generating means generates the address pit and the groove, or Using a tracking error signal generated by performing tracking on a land, a jump signal corresponding to a track jump is generated, and counting means stores the timing at which the jump signal is generated, counts the pulse signal, and counts the pulse signal. Corresponding to the count value, outputs a switching signal indicating a boundary between a land and an address pit or a boundary between a groove and a land,
When recording or reproducing information on or from a recording medium, at least one of tracking and focusing is controlled according to the switching signal.

According to a fourth aspect of the present invention, a pulse signal corresponding to the rotation of the recording medium is generated, and a tracking error signal generated by performing tracking on address pits and grooves or lands is used. A jump signal corresponding to a track jump is generated, the timing at which the jump signal is generated is stored, the pulse signal is counted, and the boundary between the land and the address pit or the groove is determined according to the count value of the pulse signal. A switching signal indicating a land boundary is output, and when recording or reproducing information on or from a recording medium, at least one of tracking and focusing is controlled in accordance with the switching signal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. In order to clarify the correspondence between each means described in the claims and the following embodiments, parentheses after each means are described. Within
The characteristics of the present invention will be described as follows by adding a corresponding embodiment (but one example). However, of course,
It does not mean that each means is limited to those described.

According to a first aspect of the present invention, at least one of a groove or an address pit including address information and a land are alternately formed on one spiral continuous from the inner periphery to the outer periphery. In a recording medium recording / reproducing apparatus for recording / reproducing information on / from a recording medium, first generating means (for example, an FG pulse generating circuit 12 in FIG. 2) for generating a pulse signal corresponding to rotation of the recording medium, and an address A second generating means (for example, a tracking error amplitude comparison circuit 20 in FIG. 2) for generating a jump signal corresponding to a track jump by using a tracking error signal generated by performing tracking on a pit, a groove, or a land. , Stores the timing at which the jump signal is generated, counts the pulse signal, Counting means (for example, the timing generator 14 in FIG. 2) for outputting a switching signal indicating a boundary between a land and an address pit or a boundary between a groove and a land in accordance with the count value, and records or records information on a recording medium. When reproducing, a control means (for example, switch 22 in FIG. 2) for controlling at least one of tracking and focusing in response to the switching signal is provided.

FIG. 1 is a diagram showing an example of the configuration of a disk D2 for recording or reproducing information in the recording medium recording / reproducing apparatus of the present invention. In the figure, the groove G2 is indicated by a solid line, the land L2 is indicated by a dotted line, and the address pit P2 is indicated by a wavy line.

As shown in FIG. 1, in the disk D2, the address pits P2 in the concave portions, the grooves G2 in the concave portions,
One sector is formed in the order of the land L2 of the convex part and the address pit P2 and the groove G2 of the concave part and the land L2 of the convex part are arranged in the corresponding part of the adjacent track. . For example, when the configuration of the first track in FIG. 1 is compared with the configuration of the second track adjacent thereto, the first track corresponding to the sector of the address pit P2-1, the groove G2-1, and the land L2-1 of the first track. The two track portions are lands L2-2, address pits P2-2, and grooves G2-2.

FIG. 2 shows a recording medium recording / reproducing apparatus 1 according to the present invention.
FIG. 2 is a block diagram showing a configuration of one embodiment.

The spindle motor 11 rotates the disk D2 at a predetermined rotation speed. FG
The pulse generation circuit 12 responds to the rotation of the spindle motor 11 by a predetermined pulse signal,
In a period in which 2 rotates once, N pulse signals are generated and supplied to the FG detection circuit 13.
The FG detection circuit 13 detects this pulse signal and supplies it to the timing generator 14.

The tracking error detection circuit 25 generates a tracking error signal by using a push-pull method for the reflected light of the light beam applied to the disk D2. That is, of the photodiode 51 divided into four, the photodiode 51A and the photodiode 51B
Are added by the addition amplifier 41 (A + B), and the outputs of the photodiodes 51C and 51D are added by the addition amplifier 42 (C + D). The difference ((A + B)-(C + D)) between the outputs of the summing amplifiers 41 and 42 is obtained by the differential amplifier 43 to generate a tracking error signal. The tracking error signal is output to the terminal 23a of the switch 23, the input terminal of the phase inversion circuit 26, and the tracking error amplitude comparison circuit 20.

The tracking error amplitude comparison circuit 20
A jump signal is generated based on the threshold value of the tracking error signal at the time of the track jump supplied from the tracking error detection circuit 25, and the timing generator 14
Output. When this jump signal is supplied to the timing generator 14, the timing generator 14 stores the counter value counted corresponding to the pulse signal supplied from the FG detection circuit 13, and supplies the counter value again from the FG detection circuit 13. The counting is started in response to the pulse signal thus input. Also,
The timing generator 14 outputs the land L2 to the terminal 19b of the switch 19 at the timing of the stored counter value.
And address pit P2 or groove G
2 and a land L2.

The control circuit 19 controls the connection of the switch 19 in response to a predetermined operation of the operation unit 28 by the user. That is, when the disk D2 is stored in the drive 10 (for example, when replacing the disk D2), the switch 19 switches the connection to the terminal 19a side in accordance with the control signal supplied from the control device 29, When recording or reproducing information with respect to D2, the connection is switched to the terminal 19b side. That is, when recording or reproducing information on or from the disk D2, the terminal 19b is connected, and a switching signal is supplied to the switches 22 and 23.

When a changeover signal is supplied from the timing generator 14 to the changeover switch 22 via the switch 19, the switch 22 sets the land L2
And a voltage (V L) suitable for focusing the address pit P2 and groove G2 from the generation circuit 31 on the side of the terminal 22a for supplying the voltage (V L) suitable for focusing.
The connection is alternately switched between the terminal 22b for supplying G) and the terminal 22b. Then, a predetermined voltage (either the voltage VL or the voltage VG) is applied to the addition circuit 21 via the switch 22.

The focus error detection circuit 24 generates a focus error signal by using the reflected light of the light beam applied to the disk D 2, and supplies the focus error signal to the addition circuit 21. That is, when the information recording surface of the disk D2 is in the focal plane of the objective lens 27, the photodiodes 51A to 51D of the four-division photodiode 51 installed at a position where the beam cross section of the astigmatism optical system is circular.
Of the photodiodes 51A installed diagonally
And the intensity of the light beam detected by the photodiode 51C is added by the addition amplifier 52 (A + C), and the intensity of the light beam detected by the photodiodes 51B and 51D arranged diagonally is added to the addition amplifier 5
3 (B + D). Then, the differential amplifier 54 generates a focus error signal by obtaining the difference ((A + C)-(B + D)) between the output of the addition amplifier 52 and the output of the addition amplifier 53. This farcus error signal is supplied to an adder 21
, A signal of a predetermined voltage supplied from the switch 22 is added and supplied to the phase compensation circuit 17.

The phase compensating circuit 17 performs predetermined compensation on the phase of the focus error signal, and outputs the result to the focusing actuator 15.
The focusing actuator 15 performs the focusing control by optically moving the objective lens 27 using the focus error signal subjected to the phase compensation so as to obtain the optimum focusing for the disk D2. I have.

When a changeover signal is supplied from the timing generator 14 to the changeover switch 23 via the switch 19, the switch 23 sets the tracking error detection circuit 2
5 and the tracking error signal (land L2
And a signal obtained by inverting the polarity of the tracking error signal supplied from the tracking error detection circuit 25 by the phase inversion circuit 26 (signal corresponding to the address pit P2 and the groove G2).
The connection is alternately switched between the terminal 23b and the terminal 23b for supplying. Then, the tracking error signal supplied from the tracking error detection circuit 25 or a signal having a polarity opposite thereto is supplied to the phase compensation circuit 18 via the switch 23.

The phase compensating circuit 18 performs predetermined compensation on the phase of the tracking error signal, and then outputs the signal to the tracking actuator 16.
The tracking actuator 16 uses the tracking error signal subjected to the phase compensation to optically move the objective lens 27 so as to obtain optimum tracking with respect to the disk D2, and performs tracking control. I have.

Next, a specific processing operation of the recording medium recording / reproducing apparatus 1 will be described with reference to a flowchart of FIG.

In step S1 of FIG. 3, when the disk D2 is stored in the drive 10 and a recording or reproducing process is instructed by a predetermined operation of the operation unit 28, the spindle motor 11 drives the disk D2 at a predetermined speed. Rotate with. The switch 19 is connected to the terminal 19a side, and the operation mode of the recording medium recording / reproducing apparatus 1 is set to the calibration mode.

In the subsequent step S2, the FG pulse generation circuit 12 generates a predetermined pulse signal, specifically, N pulse signals for each rotation of the disk D2, corresponding to the rotation of the spindle motor 11. Then, the signal is supplied to the timing generator 14 via the FG detection circuit 13.

In the following step S3, the tracking error detection circuit 25 generates a tracking error signal using the push-pull method for the reflected light of the light beam applied to the disk D2, and outputs the tracking error signal to the terminal 23a of the switch 23 and the phase inversion circuit. 26 and tracking error amplitude comparison circuit 20
To supply. For example, when tracking is performed on the land L2-2 of the second track shown in FIG. 4A, the tracking error signal largely fluctuates in the positive and negative directions at the boundary between the land L2-2 and the address pit P2-2 (FIG. 4A).
(B)) Track jump, that is, tracking of the land L2-3 of the third track is started. At the boundary between the land L2-3 of the third track and the address pit P2-3, the tracking error signal largely swings positive and negative again (FIG. 4B), and tracking of the land L2-4 of the fourth track is started. You.

The tracking error amplitude comparison circuit 20
Using the positive and negative threshold values (Vth + and Vth-) of the tracking error signal when a track jump occurs, FIG.
A jump signal shown in (c) is generated and supplied to the timing generator 14.

In the following step S4, the timing generator 14 outputs the pulse signal (N per track) supplied from the FG detection circuit 13 at the timing of the jump signal supplied from the tracking error amplitude comparison circuit 20.
(A pulse signal) is stored. For example, the timing generator 14 counts the pulse signal of FIG. 4D and increments the count value by 1, 2, 3,..., And when the count value is i, the timing signal 14 of the jump signal of FIG. When the input is received, the count value is stored at this timing, and the counting of the pulse signal supplied from the FG detection circuit 13 is started again. Similarly, the count value j
At the time of receiving the jump signal shown in FIG.
The timing generator 14 stores the count value at this timing and starts counting again.

After the generation timing of the jump pulse is stored, the terminal 19b of the switch 19 is connected under the control of the control circuit 29 in step S5, and the operation mode of the recording medium recording / reproducing apparatus 1 is changed to , The recording / reproducing mode is set.

In the subsequent step S6, the timing generator 14 uses the timing stored in step S4, for example, the switching signal (FIG. 5A) at the count value i (FIG. 5A).
(B)), and through the switch 19, the switch 2
2 and the switch 23.

Subsequently, at step S7, the switch 22
Is connected to the timing generator 14 via the switch 19.
The focus bias supplied to the adder circuit 21 is switched in accordance with the switching signal supplied from the controller. That is, the switch 22 is either a terminal 22a for supplying a voltage VL corresponding to the land L2 or a terminal 22b for supplying a voltage VG corresponding to the address pit P2 and the groove G2 according to the switching signal.
Switch connection to one of them. Specifically, the switch 22 switches the focus bias from the voltage VL supplied from the generation circuit 30 to the voltage VG supplied from the generation circuit 31 in response to the switching signal (FIG. 5B). The voltage shown in 5 (c) is supplied to the adding circuit 21. Then, the addition circuit 21 converts the focus error signal supplied from the focus error detection circuit 24 into a signal having a level corresponding to the voltage supplied from the switch 22, and outputs the signal to the phase compensation circuit 17. The focus error signal is subjected to a predetermined phase compensation by the phase compensation circuit 17,
It is supplied to the focusing actuator 15. In this way, for example, by switching the focus bias from VL to VG at the timing of the count value i,
Address pit P following land L2-2 of the second track
Focusing optimal for 2-2 can be performed.

Similarly, the switch 23 switches the tracking error signal supplied to the phase compensation circuit 18 in accordance with the switching signal supplied from the timing generator 14 via the switch 19. That is, the switch 23
According to the switching signal, the terminal 23a for supplying the tracking error signal corresponding to the land L2 or the address pit P
The connection is switched to one of the terminals 23b for supplying the tracking error signal corresponding to the groove 2 and the groove G2.
Specifically, the switch 23 outputs a switching signal (FIG. 5B).
In response to the above, the tracking error polarity is switched from + to-, and the tracking error signal shown in FIG. This tracking error signal is subjected to a predetermined phase compensation by the phase compensation circuit 18,
It is supplied to the tracking actuator 16. In this way, for example, by switching the polarity of the tracking error signal from + to-at the timing of the count value i, it is possible to perform optimal tracking for the address pit P2-2 following the land L2-2 of the second track. it can.

In the subsequent step S8, the focusing actuator 15 and the tracking actuator 16
Represents land L2 or address pit P2, respectively.
Then, the objective lens 27 is moved so as to realize focusing servo and tracking servo corresponding to the groove G2. Then, information recording or reproduction processing is performed on the disk D2.

In this manner, information can be continuously recorded or reproduced on the disk D2 constituted by the sector formed by the address pits P2, the lands L2, and the grooves G2.

Therefore, the optimum focusing and tracking for the land L2 or the address pits P2 and the groove G2 can be quickly realized.
Information can be recorded or reproduced efficiently even at the boundary between address 2 and address pit P2.

Further, since the address pits P2 are arranged on the track, a higher quality address signal can be obtained as compared with the prior art.

In this embodiment, the focus error signal is generated based on the astigmatism method. However, another method may be used. As a method for generating the tracking error signal, any method can be applied as long as the method of generating the tracking error signal inverts the polarity between the groove and the land, such as the DPP method (differential push-pull method). In the above embodiment, both the focusing and the tracking are switched, but only one of them may be switched.

[0043]

As described above, according to the recording medium recording / reproducing apparatus according to the first aspect and the recording medium recording / reproducing method according to the fourth aspect, a jump signal corresponding to a track jump is generated by using a tracking error signal. Is generated, the count value of the pulse signal is stored at the timing when the jump signal is generated, and a switching signal indicating a boundary between a land and an address pit or a boundary between a groove and a land is output according to the count value of the pulse signal. When recording or reproducing information on or from a recording medium, at least one of tracking and focusing is controlled in response to a switching signal, so that a high-quality address signal is obtained, and address pits, grooves, and Information is recorded on a high-density disk formed of sectors arranged in the order of lands. It is possible to play.

[Brief description of the drawings]

FIG. 1 shows address pits, grooves, and lands.
Alternately, disks D2 formed on one spiral
FIG. 2 is a diagram illustrating a configuration of one embodiment.

FIG. 2 is a block diagram showing a configuration of one embodiment of a recording medium recording / reproducing apparatus 1 of the present invention.

FIG. 3 is a flowchart illustrating a processing operation of the recording medium recording / reproducing apparatus 1 of FIG. 2;

FIG. 4 is a diagram showing a relationship between a tracking error signal, a jump signal, and a pulse signal.

FIG. 5 shows a pulse signal, a switching signal, a focus bias,
FIG. 4 is a diagram showing a relationship between the tracking error polarity and the tracking error polarity.

FIG. 6 is a diagram showing a configuration example of a conventional disk D1 capable of recording information on both a land L1 and a groove G1.

FIG. 7 is an enlarged view of a disk D1 of FIG. 6;

8 is a diagram showing the disk D1 of FIG. 6 as viewed from above in FIG. 7;

[Explanation of symbols]

D1, D2 disc, 1 recording medium recording / reproducing device,
10 drive, 11 spindle motor, 12
FG pulse generation circuit, 13 FG detection circuit, 14
Timing generator, 15 focusing actuator, 16 tracking actuator, 1
7, 18 phase compensation circuit, 19 switch, 20 tracking error amplitude comparison circuit, 21 addition circuit,
22, 23 switch, 24 focus error detection circuit, 25 tracking error detection circuit, 26
Phase inversion circuit, 27 objective lens, 28 operation unit,
29 control circuit, 30, 31 generating circuit, 41,
Reference Signs List 42 addition amplifier, 43 differential amplifier, 51 quadrant photodiode, 51A to 51D photodiode, 52, 53 addition amplifier, 54 differential amplifier

Claims (4)

[Claims] 1. Information is recorded or reproduced on a recording medium in which at least one of grooves or address pits containing address information and lands are alternately formed on one spiral continuous from the inner periphery to the outer periphery. In a recording medium recording / reproducing apparatus, a first generation unit that generates a pulse signal corresponding to the rotation of the recording medium, and a tracking error signal generated by performing tracking on the address pits and grooves or lands, Second generating means for generating a jump signal corresponding to a track jump; storing timing at which the jump signal is generated; counting the pulse signal; and corresponding to the count value of the pulse signal, A switching signal indicating a boundary between address pits or a boundary between the groove and the land is output. Counting means, when recording or reproducing information on the recording medium,
A recording / reproducing apparatus for a recording medium, comprising: control means for controlling at least one of tracking and focusing in response to the switching signal. 2. The recording medium recording / reproducing apparatus according to claim 1, wherein said second generating means generates said jump signal by comparing said tracking error signal with a predetermined threshold value. 3. The recording medium recording / reproducing apparatus according to claim 1, wherein said counting means stores the timing at which said jump signal is generated by setting its count value to 0. 4. Recording or reproducing information on or from a recording medium in which at least one of grooves or address pits containing address information and lands are alternately formed on one spiral continuous from the inner periphery to the outer periphery. In a recording medium recording / reproducing method, a pulse signal corresponding to the rotation of the recording medium is generated, and a jump corresponding to a track jump is generated by using a tracking error signal generated by performing tracking on the address pits and grooves or lands. A signal is generated, a timing at which the jump signal is generated is stored, the pulse signal is counted, and a boundary between the land and the address pit or a boundary between the groove and the land is corresponding to the count value of the pulse signal. And outputs a switching signal indicating whether or not to record information on the recording medium. When you play,
A recording medium recording / reproducing method, wherein at least one of tracking and focusing is controlled in response to the switching signal.