JPH06150329A - Optical disk and recording and reproducing device for optical disk - Google Patents

Abstract

(57) [Summary] [Structure] In an optical disk of the sample servo system, the servo pits formed at predetermined intervals of the sample servo system correspond to the resync signal in the data format of the continuous composite servo system. It is provided in the servo byte SB indicating the position. [Effect] The continuous composite servo type optical disc and the sample servo type are regarded as wobble pits that correspond to, for example, the resync portion of the continuous composite servo type optical disc, and are regarded as wobble pits. Compatibility with other optical discs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having compatibility with an optical disk of continuous composite servo system and an optical disk of sample servo system,
The present invention relates to an optical disk and an optical disk recording / reproducing apparatus suitable for use in an optical recording / reproducing apparatus that externally writes or reads information in accordance with each method.

[0002]

2. Description of the Related Art At present, as optical discs, continuous composite servo (Continuous Composite Servo) type optical discs and sample servo (Sample Servo) optical discs are commercially available.

Various design specifications have been proposed for a recording area of digital data on an optical disk. The continuous composite servo type optical disc shown in FIG. 8A shows a case of a so-called continuous groove servo type in which tracking servo is performed with the center between the pre-grooves PG in which grooves are formed in advance as the track center TC.

When tracking servo control is performed on this optical disk using the push-pull method, FIG.
It has each area shown in (b). An area Ph indicates a phase flag area, an area F indicates a focus area, and an area Tr indicates a tracking area. The focus area F corresponds to, for example, a mirror mark portion, and detects the amount of light reflected at this portion to servo-control an actuator incorporated in the optical pickup to adjust the objective lens to an appropriate position. . The section of the mirror mark portion has no groove. The reflected light at the mirror mark is
It is conventionally known to be used for offset adjustment of a tracking error signal. As described above, the continuous composite servo type optical disc can be various optical discs depending on the combination of the adopted systems.

Further, the optical disk of the continuous servo system,
For example, there is an optical disk divided into sectors like the ISO / IEC DIS 10090 standard shown in FIG. Above ISO / IEC
In the case of DIS 10090 standard, the physical sector PS is 725
It is set for each byte. This 725 bytes consists of 52 bytes in the pre-formatted portion PF, 6 bytes as an offset detection flag area offset detection flag (hereinafter referred to as ODF), or 6 bytes as a mirror mark, and 654 bytes as the data area D. It is 12 bytes.

In the sector mark provided in the preformat portion PF shown in FIG. 9, a data pattern which does not exist in the data in the data area D is written. The above-mentioned mirror mark portion corresponds to ODF. In the data area D shown in FIG. 10 after this ODF, a resync (RESYNC) for preventing loss of byte synchronization is provided every 15 bytes, and a 1-byte pattern is written in this resync.

By the way, for example, when a bit is lost on the optical disk during reproduction and the data is erroneously shifted by 1 bit, the data cannot be read due to the loss or the like. I will end up.
For this reason, the data area D is provided with a resync area having a 1-byte pattern. This resync area is
By providing the area, the optical disk can save subsequent data by performing error correction or the like.

An optical disk of the sample servo system, which is another system, uses the track wobbling method. The wobble pits used in this method are shifted by 1/4 TP of the track pitch TP of the optical disc with respect to the track center TC shown in FIG. Is forming.

Further, when the track servo is performed by the push-pull method on the optical disk of this method, the phase flag area Ph, the focus area F, and the tracking area Tr are respectively provided as in FIG. 11B. In the case of FIG. 11B, the wobble pits in the tracking area Tr are arranged displaced from the track center as described above.

An optical disk recording / reproducing apparatus for recording or reproducing an optical disk of this system generates a clock from data obtained by sampling a signal corresponding to reflected light from a pit formed on the optical disk. Therefore, since this optical disk recording / reproducing apparatus uses the clock in which the seek operation is synchronized with the optical disk, the address can be easily confirmed and the seek settling time of the head can be shortened.

[0011]

By the way, when an optical disk recording / reproducing apparatus for recording / reproducing an optical disk of a continuous composite servo system is made to perform recording / reproducing by using an optical disk of a sample servo system, the optical disk recording / reproducing apparatus described above becomes Usually, for example, the pre-pit portion of the optical disc is detected as an RF signal by the device, and the data area M
At the time of writing to or reading from the O portion, recording / reproducing is performed by magneto-optical.

However, the continuous composite servo type optical disk recording / reproducing apparatus uses a voltage frequency controlled oscillator (VFO) for voltage-controlling the frequency of the self-clock system to perform sampling even if recording / reproducing is attempted.・ Servo type optical disk and continuous composite ・
Recording and reproduction cannot be performed due to the difference in format from the servo type optical disk.

As described above, an optical disk recording / reproducing apparatus for recording / reproducing data on / from the continuous composite servo type optical disk and the sampling type optical disk is an optical disk recording / reproducing apparatus for a corresponding format because the formats of the optical disks are different from each other. You will need it. It is economically burdensome for the user to purchase a recording / reproducing device that takes advantage of each method.

Recently, as a demand from the user side, the demand for an optical disc having a higher recording capacity, for example, a recording capacity of 500 Mbytes or more, and an optical disc recording / reproducing apparatus for driving the optical disc is increasing.

Therefore, the present invention has been made in view of such a situation, and it is a conventional continuous composite.
An object of the present invention is to provide an optical disc having a high recording capacity compatible with the ISO standard in the servo system and compatible with the sample servo system, and an optical disc recording / reproducing apparatus for recording / reproducing this optical disc.

[0016]

The optical disk according to the present invention is a sample servo type optical disk in which servo pit portions are formed in advance at discrete predetermined intervals, and at a predetermined interval of the sample servo method. The above-mentioned problem is solved by providing the servo pits formed at the positions corresponding to the resync signals in the data format in the continuous composite servo system.

Further, in this sample servo type optical disk, a mirror surface portion is provided in an area subsequent to the servo pits provided in advance in an area divided in the circumferential direction.

Here, the physical parameters of the optical disk have a recording area of, for example, 20-41 mm. Further, in order to increase the recording capacity, the optical disc is subjected to zoning, and a so-called quasi-CLV (QCLV) system or a zoned CAV (ZCAV) system is used. This type of switching operation is performed by the optical disk drive. Each sector has 512 bytes, the linear density is 0.56 μm / bit, the track pitch is 1.4 μm, and the overhead is 1.
The recording capacity of the optical disk is set to 500 Mbytes by setting 28 and coding to 2-7 modulation. The cartridge of this optical disk is housed in a cartridge of ISO standard.

Further, the sample servo type optical disk is an optical disk having no groove, and the number of user bytes per sector is set to 512 bytes and the overhead is set to 1.28 to set 6 per sector.
Set to 56 bytes. If one segment is 16 bytes, the number of segments per sector will be 41 segments. The number of bytes per segment is set to 16 bytes. Breakdown of this segment is 1 servo byte
Bytes and the following 15 bytes are set as data bytes.

An optical disk recording / reproducing apparatus for recording / reproducing an optical disk compatible with the continuous composite servo system has passed through servo pits formed at predetermined discrete intervals during recording / reproduction of an optical disk of the sample servo system. A light detecting means for detecting the reflected light from the optical disk surface obtained at this time and detecting the reflected light from the mirror surface portion provided at a position subsequent to the servo pits provided in advance in the circumferentially divided area of the optical disk. Having tracking control according to a tracking error signal obtained from a difference in detection output of reflected light obtained when passing through the servo pit and performing offset adjustment of the tracking signal based on the reflected light from the mirror surface portion. The above-mentioned problem is solved by.

Further, the above problem is solved by using a clock whose phase is adjusted based on the clock component in the reproduced signal from the recording area output from the photodetection means, as the data read clock.

Here, specifically, the data read clock determines the frequency based on the signal which detects the servo byte and the signal which is 1 / N the signal from the built-in voltage controlled oscillator, and the voltage controlled oscillator is The phase of the frequency output by may be generated by performing phase matching with the clock component from the recording area.

Further, the optical disk recording / reproducing apparatus generates the switching timing for each area corresponding to the format of the optical disk based on the reference clock from the self-clock supplying means and the output signal from the pattern detecting means. A generating unit and a switching control unit for switching the focus error signal, the tracking error signal from the light detecting unit, and the output signal for performing the offset adjustment of the tracking error signal at the switching timing from the timing generating unit are provided. .

Tracking is performed by the sample servo using the push-pull method in this way, and the optical disk recording / reproducing apparatus of the continuous composite servo method ensures compatibility between the optical disk of the continuous composite servo method and the optical disk of the sample servo method. For recording and reproduction, the polarity of the tracking error signal is switched in the switching control unit so as to correspond to each system.

[0025]

The optical disc of the present invention is a sample servo type optical disc in which servo pit portions are formed in advance at discrete predetermined intervals, and the servo pits formed at predetermined intervals of the sample servo system are It is provided at a position corresponding to the resync signal in the data format in the continuous composite servo system, and the formats of the sample servo system and the continuous composite servo system are made compatible with each other by the corresponding position of the resync signal.

Further, the optical disc is provided with a mirror surface portion in a region subsequent to the servo pit to provide a continuous composite disc.
Servo type offset detection flag (OD
The offset adjustment of the tracking error signal by F) is performed.

The optical disk recording / reproducing apparatus detects the reflected light from the optical disk surface obtained when passing through the servo pits formed at predetermined discrete intervals at the time of recording / reproducing the optical disk of the sample servo system, and detects the optical disk. The reflected light obtained when passing through the servo pits has a light detecting means for detecting the reflected light from the mirror surface portion provided at a position subsequent to the servo pits previously provided in the circumferentially divided area The tracking control is performed according to the tracking error signal obtained from the difference between the detection outputs and the offset adjustment of the tracking signal is performed based on the reflected light from the mirror surface portion.

Further, a clock whose phase is adjusted based on the clock component in the reproduction signal from the recording area output from the light detecting means of the optical disk recording / reproducing apparatus is used for data reading, and the continuous composite servo system and sample The reading of compatible output signals of the servo type optical disk is controlled, and the data is read by the decoder while maintaining compatibility, and reproduction is performed.

Further, this optical disc recording / reproducing apparatus also records data based on the phase-controlled self clock even when recording in the recording area of the optical disc.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical disk and an optical disk recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.

First, the optical disc of the present invention will be described with reference to the sample servo system format shown in FIG. The optical disc shown in FIG. 1 is a sample servo type optical disc in which servo pit portions are formed in advance at discrete predetermined intervals, and the servo pits formed at predetermined intervals of the sample servo system are continuous composites. It is provided at the position SB corresponding to the resync signal in the data format in the servo system. This pit position is a servo byte at the head position of each segment in the sample servo type optical disc. This pit position is the continuous composite of Figure 2.
It can be seen that this corresponds to the resync position in the data recording area as shown by the format of the servo type optical disk.

In this optical disc, a mirror surface portion M is provided in an area subsequent to the servo pits provided in advance in an area divided in the circumferential direction (see FIG. 1). A specific format for making the optical disc of the present invention compatible with the current ISO standard optical disc will be described.

Regarding the current recording capacity of the optical disk, there is an optical disk of ISO standard having an recording capacity of 128 Mbytes. Since users handle large amounts of data,
Further, an optical disc having a high recording capacity is desired. If the large-capacity optical disk is an optical disk and a driver compatible with the ISO standard, the optical disk can be effectively used, and it is not necessary to provide two corresponding drivers, which is also effective in terms of cost. .

In consideration of such compatibility, it is advisable to make the circuits used as common as possible and refrain from using new circuits in terms of increasing capacity and manufacturing at low cost. Therefore, in the driver, tracking servo uses push-pull and coding uses 2-7 modulation.

As a method of increasing the capacity of the optical disk, first, there is a method of expanding the recording area, zoning, reducing the overhead, increasing the numerical aperture NA, and further narrowing the track pitch. For example, if the recording area is 20-4
If the linear density LD by laser is 0.56μm / bit, which is the same as the compact disc, the overhead OH is 1.28, and the track pitch TP is 1.4μm, the recording capacity is (2π × 20 × 10 ³ ) / (LD × 8 × OH ) × 21 × 10 ³ /TP×1.52 (1) gives approximately 500 MB.

At present, the sample servo type optical disc is not so well recognized, but this optical disc is
This is a good method to reduce the overhead.
That is, since the sample servo type optical disc uses the perfect synchronization type, the gap part in the format is unnecessary, and the overhead part can be utilized by taking advantage of the simplification of the address part due to the time axis content. Can be made smaller. For example, in a 3.5-inch continuous composite servo optical disc, the overhead is 7
It becomes 1.41 from 25 bytes / 512 bytes.

Such a method is called quasi-CLV (QCLV).
Other than the zoning of the system or the zoned CAV (ZCAV) system, the values of the conventional parameters are only changed. Based on these points, a sector format compatible with the ISO standard in a sample servo type optical disc having no groove will be described with reference to FIG.

In the sector format shown in FIG. 1, one sector is set to 512 bytes and the overhead is set to 1.28 to set 656 bytes per sector. If one segment is 16 bytes, the number of segments per sector will be 41 segments. Here, one byte of servo byte is arranged at the head position of each segment, and in particular, only segment 0 has various address information recorded in advance in a 15-byte area as a header. Subsequent segments 1 to 40 are separated by 16 bytes as a data recording area, and 1 byte of servo bytes is provided at the head position of each segment.

This servo byte pattern is composed of out-of-rule pre-pits having a length of 10 channels. Therefore, the 1-byte servo byte is provided with the mirror mark portion M after the length of 10 channels. At the time of writing on the optical disc, a verify check (hereinafter referred to as VF) pattern for clamping is written. In the write sector, the laser output keeps the write output over all one sector.

The optical disc recording / reproducing apparatus, which will be described later, performs switching control so that the resync pattern is added so that the prepit signal includes the resync pattern when the servo byte part, which is the prepit part PF corresponding to the write-once recording medium, is read.

Further, in the data recording area MO corresponding to a rewritable magneto-optical recording medium, the data signal read from the servo byte SB of this area also includes a resync pattern when the data recording area MO is read, which will be described later. The optical disc recording / reproducing apparatus is controlled so that the resync pattern is added.

Actually, the resync pattern is, for example, a 16-bit VF03 pattern "00010010010010".
Uses 10 ”channel length of 00”. Also, other VF
01 and VF02 use "0010010010010010" and "0100100100100100", respectively. In this way, the servo bit SB of the sample servo type optical disk and the resync RS of the continuous composite servo type are associated with each other so that the prepit signal and the data signal include the resync pattern. Even if there is, the decoder built in the continuous composite servo type optical disc recording / reproducing apparatus can be used as it is.

In this sample servo type optical disc, focus servo is performed by a mirror mark portion M which is a mirror surface portion following a servo byte SB provided at the beginning of each segment described later. In order to perform this focus servo, sampling is performed with a 3-channel clock. At the same time, the tracking error signal obtained by sampling the mirror mark portion M cancels the offset amount generated in the push-pull signal.

Further, the segment format for dividing the sector of the optical disk will be described. It can be divided into a segment 0 shown in FIG. 1 and a region other than the segment 0 (segment 1 to segment 40). Here, the format of the segment 0 is that the servo byte SB is 1 byte, the address mark AM is 1 byte, VF01 and VF02 are 1 byte each, the track address TA is 7 bytes, the sector address SA is 3 bytes and VF01, from the beginning. The VF02 is composed of 16 bytes of 1 byte each. The address mark AM is the servo byte SB
Use the same VF03 pattern as.

The track address TA uses a pulse width modulation (PWM) gray code. This code
"00" is "01000100" and "01" is "0100001".
"0010" for "0" and "02" and "00100100" for "03"
It is converted to and used. In this track address, TA and the four's complement of TA are inserted every 2 bits in a length of 1 byte.
The track address indicates 0 to 16383 tracks (2 ¹⁴ ) in 7 bytes, and the sector address indicates 0 to 63 (2 ⁶ ) in 3 bytes.

On the other hand, for formats other than segment 0, the VF03 pattern is written in the servo byte at the beginning of the segment. The 15 bytes after the servo byte SB are written as a data area.

By formatting the optical disk of the sample servo system in this manner, the servo bytes SB of each segment of the optical disk of the present invention become the sync and resync RS1 to RS39 of the sector format of the continuous composite servo system shown in FIG. Data can be recorded in 40 data areas in correspondence with each other, and the data area in each segment is set to 15 bytes each, so it can be understood that each segment area can be easily corresponded. In other words, this correspondence is equivalent to writing wobble pits on the resync portion of the continuous composite servo type optical disc. By adopting such a format, this optical disc can be made compatible by making the data areas of the sample servo system and the ISO standard continuous composite servo system the same.

Next, the optical disk recording / reproducing apparatus of the present invention will be described with reference to the block diagram shown in FIG.
Here, this optical disk recording / reproducing apparatus is an apparatus for recording / reproducing the sample servo type optical disk 10 compatible with the ISO standard of the present invention by using a circuit used for recording / reproducing of a continuous composite servo type optical disk. Is.

This optical disk recording / reproducing apparatus uses, as a data read clock, a clock whose phase is adjusted based on the clock component in the reproduced signal from the recording area output from the photodetection means.

In order to generate this data read clock, the optical disk recording / reproducing apparatus detects the control status of the apparatus from the return light which is the reflected light from the optical disk when recording / reproducing the optical disk of the sample servo system. A signal obtained by adding 1 / N to the output frequency from the optical signal detection unit 11 which is means for controlling the phase based on the reproduction signals from the RF region and the recording region output from the optical signal detection unit 11. And PL, which is a self-clock supply means for outputting a self-clock generated by comparing the phase of the reproduction signal with each of the areas of the optical disc.
And an L circuit section 14.

Further, this optical disk recording / reproducing apparatus is provided with a resync generator 12 which is a resync pattern supplying means for supplying a resync pattern to the servo pit as sync loss prevention information of the data area, and the optical signal detecting section 11. In the servo pit area of the output signal, the resync generator 12
It has a servo byte decoder 13 which is a pattern detecting means for detecting the resync pattern supplied from

Based on the output signal from the servo byte decoder 13 (that is, the signal from the RF area) and the reproduction signal from the recording area, the output from the built-in voltage controlled oscillator (hereinafter referred to as VCO) 14B is set to 1. The phase of the PLL circuit section 14 is controlled by the / N signal.
Switches and outputs the plurality of phase-controlled self clocks, and uses the output from the VCO 14B as a reference clock. Here, the PLL circuit unit 14 is
The frequency is determined based on the signal from the F region and the VCO 14B. In particular, the PLL circuit unit 14 controls the phase of the self-clock based on the clock component in the reproduction signal from the recording area.

Further, the optical disc recording / reproducing apparatus outputs the focus error signal, the tracking error signal and the output signal for performing the offset adjustment of the tracking error signal from the VCO 14B of the PLL circuit section 14 from the optical signal detecting section 11. And a timing generator 15 that is a timing generator that generates a switching timing for each area corresponding to the format of the optical disk based on the output signals from the servo byte decoder 13 and the MO detector 11e using the output of the above as a reference clock. There is also provided a signal switching control unit 16 which is switching control means for switching at each switching timing from the timing generation unit 15.

The signal switching control unit 16 is provided with a polarity reversing unit 161 for switching the polarities of the tracking error signals of the continuous composite servo system and the sample servo system, and controls the switching so that the continuous composite servo system can be operated by one device. It is possible to record and reproduce while satisfying the compatibility of the data recording areas of both the system and the sample servo system.

In this optical disc recording / reproducing apparatus, a tracking error signal and a focus error signal are reflected from the reflected light when passing through servo pits formed in advance at discrete predetermined intervals, and the tracking error signal and the focus error signal are detected as the optical signal detecting section. 11, the tracking servo control and the focus servo control are performed according to the output signals, and the offset of the tracking error signal is adjusted based on the reflected light from the mirror mark portion M.

Further, the configuration and operation of each part in the optical disk recording / reproducing apparatus of the present invention will be described with reference to FIGS. The optical disk 10 is rotated by the rotation of the spindle motor 23 to a certain number of rotations. With the rotation of the optical disc 10, the optical pickup 11a of the optical signal detector and / or the overwrite magnetic head 22 moves to the write or read position of the optical disc 10.

The optical signal detecting section 11 irradiates a desired position of the optical disc of the present invention with laser light emitted from a laser light source, and returns light reflected by the optical disc surface to, for example, a light having a 6-division photodetector The pickup 11a, the extraction units 11b and 11c for supplying and outputting the outputs I and J from the optical pickup 11a, respectively, and the outputs from the extraction units 11b and 11c detect the pre-pit portion PF area. An RF detector 11d, an MO detector 11e for detecting a data recording area, and a calculator 11f for calculating four output signals from a four-divided area arranged in the center of the six-division photodetector. It is composed of 11g.

The computing units 11f and 11g perform the computation A + B- (C + D) by using the four detection signals A, B, C and D from the four-divided detectors and the tracking error signal and the computation A + C-. (B + D) is performed to supply the focus error signal and the signal switching control unit 16, respectively.

The outputs of the RF detector 11d and the MO detector 11e are supplied to the terminals a and b of the changeover switch 17, respectively. The terminal c of this changeover switch 17
Is supplied with a resync pattern from a resync generator 12 that generates a sync loss prevention pattern. The RF detector 11d also supplies an output signal to the servo byte decoder 13.

The servo byte decoder 13 detects the start position of the sector by decoding whether the servo bytes SB and the servo marks SM shown in FIGS. 1 and 2 match the corresponding patterns (FIG. 4 ( See e)). The servo byte decoder 13 outputs the output signal to the PLL.
They are supplied to the circuit section 14 and the timing generation section 15, respectively.

The PLL circuit section 14 controls the phase with a signal supplied from the servo byte decoder 13 and outputs a self clock. Therefore, the PLL circuit unit 14 includes a phase control unit 14A and a voltage controlled oscillator (hereinafter referred to as VCO).
14B, 1 / N circuit 14C, and signal changeover switch 14D
It consists of. The phase comparison circuit 141 shown in FIG. 6 inputs the output of the servo byte decoder to one end side,
A signal whose frequency is 1 / N by the 1 / N circuit 14C of the output of B is input to the other end of the phase comparison circuit 141. The phase comparison circuit 141 feeds back the output from the 1 / N circuit 14C to the other end side to form a loop and controls the phase.

This phase comparison circuit 141 has a VCO 14B.
Is compared with the signal corresponding to the read pattern of the servo byte. The phase comparison circuit 141 outputs the output signal to the low pass filter 14
2 to the VCO 14B. VCO 14B
Adjusts the oscillation frequency as a self-clock according to the supplied voltage and adjusts the timing generator 15 and the encoder 2.
It outputs to 0 and supplies to the above-mentioned 1 / N circuit 14C, signal changeover switch 14D, and voltage phase control circuit 145, respectively. When supplied to the terminal a of the signal changeover switch 14D, this signal is supplied as a prepit clock.

The PLL circuit section 14 shown in FIG.
Has another phase comparison circuit 143. The phase comparison circuit 143 inputs the output from the MO detection unit 11e to one end side, and feeds back the output from the voltage phase control circuit 145 described later to the other end side. The phase comparison circuit 143 is
Phase comparison is performed on the output from the MO detector 11e and L
It is output to the voltage phase control circuit 145 via the PF 144.

The voltage phase control circuit 145 uses the LPF1.
The output from the VCO 14B is phase-controlled according to the output voltage from the switch 44 and is supplied to the terminals b and c of the signal changeover switch 14D. The signal changeover switch 14D is a switching control signal RF / RF which is supplied from the timing generator 15.
Three signals are selectively switched by the MO / RESSYNC switching control signal. FIG. 4A shows the changeover order of each changeover selection and the terminal position of the changeover switch over time. The signal changeover switch 14D is supplied to the decoder 18 as a read clock by the signal which has been selected and changed.

The voltage phase control circuit 145 outputs the output signal to MO.
It is output as a clock. VC of PLL circuit unit 14
The self-clock from O14B is supplied not only to the timing generator 15 provided outside this circuit as described above, but also to the resync generator 12 and the encoder 20. The resync generator 12 generates a resync pattern based on the self clock.

Next, the timing generating section 15 will be described. The timing generating section 15 is composed of a timing generating circuit 15a and an address decoder 15b. A self clock is input to each of them as a reference timing. The timing generation circuit 15a and the address decoder 15b recognize the head position of each sector based on the pattern from the servo byte decoder 13. Further, the address decoder 15b decodes the supplied address of the pre-pit portion PF area and outputs it to the control unit 19.

The timing generation circuit 15a generates various timings for switching and selecting the header portion corresponding to the format of each sample servo system shown in FIG. 1 from the self clock based on this position. In the case of the sample servo system shown in FIG. 1, the address decoder 1
5b is an address mark AM from the servo byte decoder 13 as an address area written after the servo byte area by the servo byte pattern shown in FIG.
Track address TA 7 bytes and sector address SA
The 3-byte area is set to level "H" (Fig. 4 (f))
See). The signal of FIG. 4 (f) is supplied to the timing generation circuit 15a.

The timing generation circuit 15a is shown in FIG.
The pre-formatted pre-pit portion PF (or RF area as a signal) and the data recording area (or MO area as a signal) shown in FIG.
The F / MO / RESYNC changeover control signal is supplied to the signal changeover switch 14D and the signal changeover switch 17 in the PLL circuit section 14. This signal changeover switch 17
A signal corresponding to each timing can be supplied from the optical signal detection unit 11 to the decoder 18 by switching the RF / MO / RESSYNC switching control signal.

Here, FIG. 4A shows a section of selection switching.
, The resync (RESYNC) section is switched to the resync generator 12 side so that the servo byte SB
Instead of reading the data from, the resync pattern is output to the decoder 18. Since the resync pattern is supplied corresponding to the servo byte area in this way, recording / reproduction is performed by the continuous composite servo type optical disc recording / reproducing apparatus compatible with the ISO standard even though it is a sample servo type optical disc. Will be able to. Further, at this time, the data recording area of the optical disc to be used is compatible because the formats such as the number of segments and the number of bytes of one segment are the same.

Further, the timing generation circuit 15a outputs a changeover control signal (see FIGS. 4B, 4C and 4D) for turning on / off the signal to the signal changeover control section 16 as well. , 16b, 16c, respectively. The change-over switch 16a supplies the signal of the address mark AM area sampled as shown in FIG. 4B as a focus error signal to the buffer 16d via the hold circuit 16h and outputs it to the focus servo system. As shown in FIG. 4C, the changeover switch 16b uses the hold circuit 1 as a mirror level with a signal obtained by sampling the mirror mark area following the servo byte pattern.
It is supplied to the other end side of the buffer 16f via 6i.

Further, the changeover switch 16c is shown in FIG.
The tracking error signal obtained by sampling each prepit written in the servo byte SB area as shown in FIG.
It is supplied to one end side of the buffer 16f via e. The buffer 16f adjusts the offset of the tracking error signal according to the output from the mirror level to cancel the offset generated in the tracking error signal.

On the other hand, when this optical disk recording / reproducing apparatus records / reproduces an optical disk of the continuous composite servo system, the RF area showing the preformat of FIG. 5A from the format of the continuous composite servo system has the level "H". The MO area indicating the data area to level "L"
I have to. At this time, the switching control signals (FIGS. 5B and 5D) for switching the sampling timings of the focus error signal and the tracking error signal from the timing generation circuit 15a are always turned on.
That is, when this optical disc is used, the optical disc recording / reproducing apparatus only needs to read the signal written on the optical disc as it is, and it is not necessary to distinguish the RF region, the MO region, and the resync region. Further, the offset adjustment by the mirror mark portion M is performed by the control to turn it on in the ODF area shown in FIG. 5C to cancel the offset generated in the tracking error signal.

In this way, the changeover switch is controlled by switching the timing to be set according to each method. Depending on the recording capacity, it is compatible with the conventional ISO standard 128 MB optical disk and ISO standard, for example, 5
The optical disc of the present invention having a recording capacity of 00 Mbytes uses optical modulation and magnetic field modulation, respectively. At this time, the two optical disks have different tracking polarities. This is because the reflection areas of the continuous composite servo type optical disc and the sample servo type optical disc shown in FIG. 7 become reflections between the grooves and from the pre-pit portion to the mirror mark portion M, respectively, so that a tracking error from the sample servo type optical disc. The polarity of the signal is
Contrary to the polarity of the tracking error signal from the continuous composite servo type optical disc, it is inverted.

In order to correspond to the tracking error signals of the 128 Mbyte and 500 Mbyte optical discs,
The buffers 16f and 16g respectively supply the outputs of the tracking error signals whose levels are inverted by grounding the other ends of the buffers 16f and 16f to the changeover switch 16h.

The change-over switch 16h is changed over when the terminals a and b reach the ODF and the mirror mark portion of the sample servo system depending on the recording capacity of the optical disk used. This switching operation maintains compatibility between both types of optical disks. The output from the changeover switch 16h is supplied to the tracking servo system as a tracking error signal and used for servo control.

The decoder 18 reads the data of the signals in each region corresponding to the format at the timing of the read clock and supplies the data to the control unit 19. Also, this optical disk recording / reproducing apparatus records data based on the phase-controlled self-clock even during recording in the recording area of the optical disk. At this time, the control unit 19 supplies write data to the overwrite magnetic head 22 via the encoder 20 and the head drive circuit unit 21. In the case of the sample servo type optical disk, the magnetic head 22 writes on the optical disk 10 using magnetic field modulation.

As described above, the optical modulation is used for the conventional ISO standard optical disk and the magnetic field modulation is used for the sample servo type optical disk of the present invention to effectively use the area having the format compatibility. By using the conventional circuit configuration using the self-clock, by simply changing the switching timing, it is possible to generally perform recording / reproduction on the incompatible continuous composite servo type and sample servo type optical discs. . Further, the optical disk recording / reproducing apparatus uses a servo byte of a portion common to optical disks of different formats, that is, a portion corresponding to a resync of a continuous composite servo system as a wobble pit, for example, using an IC of a continuous composite servo system. By effectively utilizing the circuit configuration described above, it is possible to realize an optical disc having a high recording capacity with a small number of circuit changes, simultaneously reduce the manufacturing cost of the apparatus itself, and simplify the circuit configuration.

Although the resync generator is used to supply the resync pattern in this embodiment, the present invention is not limited to this method, and the decoder is reset at the resync timing to input the resync pattern to the decoder. Obviously, the same action as described above may be performed.

[0079]

As is apparent from the above description, according to the optical disc of the present invention, in the sample servo type optical disc in which the servo pit portions are formed in advance at discrete predetermined intervals, Servo pits formed at predetermined intervals of the servo system are provided at positions corresponding to the resync signal in the data format of the continuous composite servo system, so that, for example, the resync part of the optical disk of the continuous composite servo system is formed. Correspondence can be taken. By considering the resync pattern supplied corresponding to this position as a wobble pit, compatibility between the continuous composite servo type optical disc and the sample servo type optical disc can be achieved, and further division in the circumferential direction is possible. By providing the mirror surface portion at least in the area subsequent to the first prepit of the prepit portion previously provided in the above area, the offset adjustment of the tracking error signal and the focus error signal can be sampled and contributed to the servo control.

Further, in the optical disc recording / reproducing apparatus for recording / reproducing the optical disc, the optical disc recording / reproducing apparatus is
Tracking control is provided in accordance with a tracking error signal obtained from a difference between detection outputs of reflected light obtained when the light detecting unit passes through the servo pits. By adjusting the offset of the tracking signal based on the reflected light from the mirror surface part, the wobble pits of the servo bytes of the part common to the optical discs of different formats, that is, the part corresponding to the resync of the continuous composite servo system are performed. For example, by effectively using the conventional circuit configuration by using an IC of a continuous composite servo system, an optical disc having a high recording capacity can be realized with a small circuit change, and at the same time, the manufacturing cost of the device itself can be reduced. be able to.

Further, by using a clock whose phase is adjusted based on the clock component in the reproduced signal from the recording area output from the photodetection means as a data read clock, for example, a signal in which a servo byte is detected and a built-in signal The frequency is determined based on the signal from the voltage-controlled oscillator that is 1 / N, and the phase of the frequency output from the voltage-controlled oscillator is self-locked by phase matching with the clock component from the recording area. Can be used in both of the above formulas to realize a device having compatibility between the two formulas, and the circuit configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a format of a sample servo system in an optical disc according to the present invention.

FIG. 2 is a schematic diagram illustrating a format of a continuous composite servo system according to the ISO standard with respect to the format of the sample servo system shown in FIG.

FIG. 3 is a diagram showing a schematic block circuit in the optical disc recording / reproducing apparatus of the present invention.

FIG. 4 is a timing chart when the block circuit shown in FIG. 3 is operated using a sample servo type optical disc.

5 is a timing chart when the block circuit shown in FIG. 3 is operated using an optical disk of a continuous composite servo system.

6 is a block diagram showing a circuit configuration of a PLL circuit unit shown in FIG.

FIG. 7 is a schematic diagram showing a pit arrangement of a tracking method with a pre-groove and a method of a push-pull composite method, and explaining a difference in polarity between these methods.

FIG. 8A is a schematic diagram illustrating a pit arrangement of a continuous composite servo type optical disc tracking method and a push-pull composite flag tracking servo type pit arrangement of FIG. 8B.

FIG. 9 is a schematic diagram for explaining a sector format in an ISO standard optical disc format.

10 is a schematic diagram for explaining a format of a data area in a sector format in the ISO standard optical disc shown in FIG.

FIG. 11A is a schematic diagram illustrating a tracking method in an optical disk of a sample servo method and a pit arrangement of a push-pull wobble pit pit tracking servo method in FIG. 11B, and explaining these methods.

[Explanation of symbols]

 10 --- Optical disk 11 --- Optical signal detector 12 --- Resync generator 13 --- Servo byte decoder 14 ---・ ・ ・ ・ PLL circuit section 15 ・ ・ ・ ・ ・ ・ Timing generation section 16 ・ ・ ・ ・ ・ ・ Signal switching control section 14D ・ ・ ・ ・ Signal switching switch 17 ・ ・ ・・ ・ ・ ・ Changeover switch 18 ・ ・ ・ ・ ・ ・ ・ ・ Decoder 19 ・ ・ ・ ・ ・ ・ Control unit 20 ・ ・ ・ ・ ・ ・ Encoder 21 ・ ・ ・ ・ ・ ・ Head drive circuit unit 22 ... ・ ・ ・ Magnetic head for overwriting 23 ・ ・ ・ ・ ・ ・ Spindle motor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location G11B 20/14 351 A 8322-5D

Claims (4)

[Claims] 1. In a sample servo type optical disc in which servo pit portions are formed in advance at discrete predetermined intervals, servo pits formed at predetermined intervals of the sample servo method are continuous composite servos. An optical disc, which is provided at a position corresponding to a resync signal in a data format in the method. 2. The optical disk according to claim 1, wherein a mirror surface portion is provided in a region subsequent to the servo pit. 3. An optical disk recording / reproducing apparatus for recording / reproducing an optical disk, comprising a light detecting means for detecting a reflected light from the optical disk surface, and the reflected light obtained when the light detecting means passes through the servo pit. The optical disc recording / reproducing apparatus is characterized in that tracking control is performed according to a tracking error signal obtained from the difference between the detection outputs of the above, and the offset of the tracking signal is adjusted based on the reflected light from the mirror surface portion. 4. The optical disk recording / reproducing according to claim 3, wherein a clock whose phase is adjusted based on a clock component in a reproduced signal from the recording area output from the photodetecting means is used as a data reading clock. apparatus.