JPH02270136A - Optical information recording medium and recording/ reproducing device - Google Patents

Abstract

PURPOSE:To improve the resolution of a track moving quantity and the reliability of moving direction detection by providing a mark which periodically changes according to the change of a track. CONSTITUTION:Tracks 2 are spirally or concentrically formed on a disk information recording medium 1, and sample marks 3 are periodically provided. The sample mark 3 consists of two pits wobbled mutually in the reverse directions with respect to a virtual track center 2, a timing pit positioned on the virtual track center 2, and access marks composed of the plural pits. The marks 3 detect clocks which are used for the recording/reproducing of data, a tracking error signal used to track an optical spot, and the track moving quantity and moving direction for access. Thus the moving direction at the time of accessing can be discriminated, and the resolution of the track moving quantity can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording medium and an apparatus for optically recording information, and particularly to recording and reproducing data based on information in pits provided in advance on a disk. The present invention relates to an optical information recording medium and a recording/reproducing apparatus suitable for recording.

[Prior Art] In recent years, so-called optical disk devices, which optically record and reproduce information on a disk-shaped recording medium, have been developed and are finally beginning to become popular. A format called a sampled format is known as one of the formats of such an optical disc system. This method is described in the Proceedings of Niss B.I.E.
Volume 695, Optical Mass Data Storage ■, 1986. Pages 112 to 115 and Pages 239 to 242 (Proceedin
g of 5PIE, vol 695.0ptica
l Mass Data St.

rage II, 1986. p112-p115.
p239-p242).

In this format, as shown in FIG. 4, sample marks provided in advance on the disc are used to obtain a tracking error signal and a timing signal.

Multiply this timing signal to extract the clock signal,
Detection of servo system error signals such as tracking and focus, and data recording and reproduction are performed in synchronization with the extracted clock signal. Sample mark is at the virtual track center 6
-1.6-2,..., a pair of wobbling pits 7-1.7-2,..., 8-1.8- which are off-tracked in opposite directions by 1/4 track pitch 2,
A tracking error signal is detected from the difference in amplitude of the reproduction signal between wobbling pits 7 and 8, which are composed of timing pits 9-1, 9-2, . Extract the clock from.

The area between pits 8 and 9 is a so-called unique pattern (18 consecutive 0's) that does not exist in the modulation pattern, and the sample mark is identified using this pattern. The position of the first wobbling pit 7 changes every 16 tracks. This is to obtain a cross-track signal during seek.

The data format is track 1 as shown in Figure 5.
The circumference is divided into 32 sectors, one sector is composed of 43 segments, and one segment is divided into 18 bytes. One byte is further divided into 15 channel bits. One of the segments is for sector identification information (ID), and the sector identification information (ID) is recorded by pre-pits. Data is recorded in the remaining 42 segments. 1 segment (・ is a 2-byte sample mark and 16
Since it is composed of a byte data area, 672 bytes of data are recorded in one sector.

The 672 bytes of data includes 512 bytes of user data, 16 bytes of control data, and 1 error correction code.
It is 44 bytes.

During recording, data is converted from 8 bits of data per byte to 15 channel bits (=1 symbol) using a modulation method called 4/15 conversion, and is recorded in the data area between sample marks. The 4/15 conversion is detailed in the aforementioned literature. In 4/15 modulation,
The 15th channel pit is always O, and of the other 14 channel bits, the two odd-numbered channel bits and the two even-numbered channel bits are 1. A maximum of four consecutive 1's can occur, but if a 0 is inserted between 1's, at least two 0's are included. (During the data byte division, there may be only one 0, but this is always 0, so this is not a problem.
) If o's are consecutive, a maximum of 17 o's will follow. (
For example, data is expressed in hexadecimal 00. In the case of EE,
The 1st, 2nd, 5th, and 6th channel bits of the first data and the 9th, 10th, 13th, and 14th channel bits of the second data become 1, and the others become 0. ) At the time of reproduction, the reproduced signal amplitude for each channel bit is detected, and the top two reproduced signal amplitudes are selected for each odd-numbered bit and even-numbered bit, and it is determined that a pit, that is, 1 exists at that position. Then, data is obtained conversely from the 4/15 modulation conversion table.

The recording area of the disk is 60 mm in inner diameter and 120 mm in outer diameter, the track density is 1.5 μm/track, the linear recording density is 0.95 μm/bit, and the disk rotation speed is usually 18
00 ppm, but it is not specified. The number of sample marks per round of the track is 1376, and the sampling frequency is approximately 41 kHz.

In this method, tracking servo is performed using only information from sample marks, so the amount of track movement at the time of access is also obtained from the sample marks.

As shown in FIG. 3, the position of the first wobbling pit 2 changes every 16 tracks, so by detecting the position of this pit, the amount of track movement every 16 tracks can be detected. The detection limit of the moving speed is about 1 m/s.

However, with this method, the amount of track movement during access is 1
There was a problem in that the resolution was low because it could only detect every 6 tracks. Furthermore, since this method uses only two patterns, there is also the problem that the direction of movement at the time of access cannot be determined.

[Problems to be Solved by the Invention] The above conventional technology has the problem that the movement direction at the time of access cannot be determined from the information of sample marks provided in advance on the disk, and the resolution of the track movement amount is low. There were also problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optimal format for an optical disk system in which the direction of movement at the time of access can be determined and the resolution of the amount of track movement is high.

[Means for Solving the Problems] The above object is achieved by providing marks that change periodically in accordance with changes in the track.

[Operation] Generally, in a sample servo type optical disk device, unique marks called sample marks are provided periodically on the disk, and the following three operations are performed.

(1) Extracting the clock used for recording and reproducing data.

(2) Detection of a tracking error signal for tracking the optical spot.

(3) Detection of track movement amount and movement direction for access.

In the present invention, the configuration of the marks provided in the sample mark makes it possible to improve the resolution of the track movement amount and to detect the movement direction with high reliability.

[Example] A first example of the present invention will be described below with reference to FIG. 1 and subsequent figures. FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows the pit arrangement of the embodiment of FIG. Note that this embodiment shows an example in which 4/11 modulation is used as the data modulation method.

1 is a disk-shaped information recording medium according to the present invention, on which a spiral or concentric track 2 is formed, and sample marks 3 are periodically provided on the track. As shown in FIG. 2, the sample mark 3 consists of two pits (a first wobbling pit 7 and a second wobbling pit 8) that are wobbled in opposite directions with respect to the virtual track center 2. The timing pit 9 is placed at the center of the track 2, and the access mark 11 is made up of a plurality of pits.

The access mark 11 in the embodiment of FIG. 2 is 4/1
It is configured as one modulation axis modulation axis. 4/11 modulation rule Refers to a modulation rule in which 1 byte of data (8 data bits) is projected onto 11 transmission bits and converted into a pattern marked in 4 transmission pits when recording and reproducing modulation axis information. An example of a modulation table is shown in FIGS. 11 (1) to (4). The left column is information data, and the right column is a modulated 11-bit pattern. The access mark 11 is a sample mark selected from a pattern group in which three of the four marks from the table are placed between the third to fifth transmission bits and the remaining one bit is placed within the 11th transmission bit. 3, the pit of the 11th transmission bit is the first wobble pit 7. The arrangement of pits in the access marks 11 changes periodically in response to changes in the tracks. In this embodiment, one period is made up of 16 tracks.

FIG. 3 shows the data format of the embodiment shown in FIG.
, one track consists of 22 sectors, and one sector consists of 76 segments. One segment consists of a total of 10 bytes, including a 2-byte sample mark and an 8-byte data area.

The disc diameter is 48mm inside the user area.

The outer diameter is 80mm, and if the lead-in and lead-out areas are included, the inner diameter is 46mm and the outer diameter is 82mm.The rotation speed is 180mm.
In the case of Orpm, the linear recording density is 1°08 μm/bit (0,785 μm/channel bit), track-
1672 sample marks per lap (sample period 50
．． 16kHz), and the user data capacity is 100MB or more.

Compared to the conventional example, the linear recording density is about 13% lower, and can be fully realized using exactly the same technology as the conventional example (laser wavelength 830 nm, lens aperture ratio 0.53). If the optical spot becomes smaller through optical improvements such as the laser wavelength and lens aperture ratio, it will be possible to utilize even the inner periphery, further increasing the user data capacity.

The user data transfer rate is 3.9Mbps in the conventional example.
However, the speed has decreased to 5.5 Mbps. However, this is due to a decrease in the disk diameter, and can be increased by increasing the disk rotation speed.

The sampling period is approximately 1.2 times that of the conventional method.

This means that the number of sample marks per track lap is approximately 1.
．． This is due to the fact that it has doubled. Therefore, in feedback control systems such as track servo, focus servo, and clock regeneration PLL, the phase delay caused by the sampler is improved by about 20%, and the stability is further increased.

The amount of track movement is detected using access marks, and its resolution is one track. Since the access mark conforms to the data modulation side, it can be decoded as data. Furthermore, the detection limit for the moving speed of the tracks is about 1 m/s since up to 16 tracks can be detected for one sample period. Since the recording area is 16 mm, the average access time is 10.7 ms assuming constant acceleration and deceleration, and sufficient performance can be achieved.

The access mark 11 in FIG. 2 has three access marks between adjacent tracks.
Only one of the pits changes its position. In this case, the change in position is limited to the following two cases. (
1) Relative position change of 1 transmission bit seen from track 1 to track 16 (2) 2 transmission bits with 1 fixed pit, i.e. the 6th transmission bit, in the middle seen from track 16 to track 1 relative position change. Assuming that data demodulation is performed by differential detection, as a result of the above, even if the reading light spot scans between tracks, the error in the read access mark is guaranteed to be within one track. Difference detection takes advantage of the fact that in N/M modulation, there are only N marks in M transmission bits corresponding to 1 byte of data, and measures the signal amplitude of each M transmission bit in 1 byte, and calculates the amplitude value. Refers to a method of demodulating the Nth transmission pit positions from the largest to the mark position.

When the reading light spot scans under the conditions (1) above in Fig. 6 (1) and under the conditions (2) above in Fig. 6 (2),
In other words, if the access special tracking servo is turned off,
I will explain about it. Locus a, b of reading spot light,
Each reproduced signal is shown for Q and d. The triangular portions indicate the top four signals with the largest signal amplitudes as a result of differential demodulation.

It can be seen that the result of differential demodulation is equal to the access mark of either adjacent track.

Furthermore, if we take advantage of the fact that there are three access marks in six transmission bits, the sixth
Even if the signal amplitude shown by the square in the figure increases and exceeds the signal amplitude of the 11th transmission bit, within the access mark area, the top three signal amplitudes are taken and the data shown by the square and the 11th
Correct access marks can be reproduced by replacing the data of the transmission bits.

As described above, in the present invention, the sampling period has been improved to about 20% more than the conventional one, and the detection resolution of the track movement amount has been improved to one track without changing the data density or redundancy, keeping the track movement speed at the conventional performance. Therefore, it is possible to realize an access mark whose direction can be detected. Furthermore, when the reading spot light scans between tracks, the track reading error can be reduced to within one track, and the reliability of reading can be improved.

Examples of the second access pattern are shown in FIGS. 12 and 13. FIG. 12 shows the configuration of 16 servo marks tracks. FIG. 13 is a symbolic representation of an example of a pattern inserted from the third transmission bit to the eighth transmission bit access mark in FIG. 12. The right column of (1) selects 3 marks for 6 transmission bits as access marks20
The left column shows the types of patterns, and the symbols that represent these patterns. (2) is a 16-track repeat pattern obtained by specifying the relative position change of one transmission bit between adjacent tracks, and shows 22 types of access marks expressed by symbols each time the track moves from left to right to an adjacent track. ing. Furthermore, patterns obtained by reversing or going backwards have the same properties.

An example of the third access pattern is shown in FIG. 14. Similarly to FIG. 13, the access pattern of 6 transmission bits is
It is a symbolic representation of the structure that spans a track. The expression symbols follow the 20 types of patterns in the right column and the symbols in the left column of (1) in FIG. This example is a 16-track repeat pattern obtained by always placing a fixed mark between adjacent tracks and allowing a change in the relative position of two transmission bits. The mark pattern from the third transmission bit to the eighth transmission bit is further symmetrically transformed in the track direction with the axis between the fourth transmission bit and the fifth transmission bit. These are represented by 15 symbols each time moving from left to right to an adjacent track.
Nine types of access marks are shown. Furthermore, patterns obtained by reversing or going backwards have the same properties.

The first embodiment is a 16-track repeating pattern obtained by always placing fixed marks between tracks and allowing relative position changes of 2 or 63 transmission bits, as in the third embodiment. For each track, the mark pattern from the 3rd transmission bit to the 8th transmission bit is the 4th transmission bit and the 5th transmission bit.
This is selected from a group formed by symmetrical transformation in the track direction with the axis between transmission bits. These first, second... All of the access marks shown in the third embodiment can achieve the same effects as those shown in the first embodiment.

FIG. 7 shows an embodiment of an optical disk recording and reproducing apparatus using the disk shown in FIG. Reference numeral 1 designates an optical disc, and as shown in the first embodiment, sample marks 3 are provided in advance on the disc surface.

A spindle motor 20 rotates the optical disc 1. Reference numeral 21 denotes an optical pickup, which converts the laser beam irradiated from the laser 22 into a collimating lens 23. Polarizing beam splitter 24. Quarter wave plate 25. Objective lens 2
6 and condenses onto the recording surface 27 of the disc 1. The light reflected from the recording surface 27 of the disk 1 travels in the opposite direction from when it was incident, is reflected by the polarizing beam splitter 24, and is focused by the detection lens 28 onto the photodetector 29. The photodetector 29 is divided into two regions and is configured so that a focus error signal can be detected based on the difference in light amount between each region.

A differential amplifier circuit 30 amplifies the difference signal between the detection signals of the photodetector 29. 32 is a sample and hold circuit that detects and holds a detected focus error signal (a value detected from the mirror surface of the middle leg of the sample mark by the astigmatism method). Reference numeral 33 denotes a servo circuit for performing focus servo, which moves an actuator 34 that drives the objective lens 26 in the focus direction to perform focus servo.

31 is an amplifier circuit that detects the total amount of light incident on the photodetector 29. Reference numeral 35 denotes a peak detection circuit composed of a differentiation circuit and a zero-cross detection circuit, which detects the peak position of the reproduction signal corresponding to the timing pit 9 from the reproduction signal detected by the amplifier circuit 31. The positions of the first wobbling pit 7, second wobbling pit 8, and timing pit 9 of the servo mark reproduction signal do not change over the disk surface and are always constant even when the tracking servo is not applied. appears in the pattern of

Furthermore, these nine pit groups can be identified because they appear at a constant cycle, and the clock regeneration circuit 36 uses the peak signal corresponding to the timing pit 9 to generate a PLL (Phase).
Multiply by 110 using Locked Loop) circuit,
Extract the clock for recording and reproducing data.

The period of sample mark 3 is 50.1 kHz (180
0 rpm), and the clock frequency is 5°5 MHz. The output of the clock recovery circuit 36 is used as a clock for the digital processing circuit 37.

38 detects the position of the transmission pit having the amplitude up to the fourth in order from the maximum value of the reproduced signal amplitude in each symbol, and at the same time as decoding the data, detects the access mark conforming to the above-mentioned modulation rule from the servo mark position. It is also a detection/decoding circuit that detects and protects errors in access marks. Details of this circuit will be described later. 43 is a D/A converter, and 41 is a track servo circuit. The tracking error signal is outputted through the D/A converter 43 and drives the actuator 42 in the tracking direction to slightly move the objective lens 26 in the tracking direction to perform tracking.

Reference numeral 40 denotes a track movement amount detection circuit, which detects the track movement amount, track movement speed, and direction from the decoded value of the access mark output from the detection decoding circuit 38. Reference numeral 44 denotes a control circuit composed of a microcomputer, which controls not only the entire drive device but also track access. The current position is calculated from the track movement amount output from the track movement amount detection circuit 40, and a linear motor control voltage is outputted through the D/A converter 48. Reference numeral 46 denotes a servo circuit for a linear motor for track access, which drives a linear motor 47 in accordance with a linear motor control voltage to move the entire optical pickup 21 in the track direction.

Reference numeral 60 indicates a drive circuit for the semiconductor laser 22, and reference numeral 49 indicates a data modulation circuit, which modulates the input recording data by 4711 and converts it into serial data. A thermal change is generated on the surface to form bits and record data.

The detection decoding circuit 38 will be explained using FIGS. 9 and 8.

First, in FIG. 9, the A/D converter 50 inputs the reproduced signal to the detection/decoding circuit 38 with the transmitted bit amplitude as digital data. The reproduced signal converted into digital data is input to the difference circuit 51.

FIG. 8 shows the configuration of the differential circuit 51.

In FIG. 8, 81 is a latch circuit that latches A/D converted data for each channel bit, 82 to 85 are latch circuits that latch data at mark positions among 11 transmission bits, and 86 is from latch circuits 82 to 85. A selection circuit 87 compares and selects the smallest data from among the four types of latch data; a comparison circuit 88 compares the output of the selection circuit 86 and the output from the latch circuit 81; A latch that controls so that when it is determined that the data latched by the latch circuit 81 is larger than the minimum data of the latch circuits 82 to 85, the data of the latch circuit 81 is relatched to the latch that holds the minimum data among the latch circuits 82 to 85. A control circuit, 89 is a counter that counts with the transmission lock of 11 transmission bits and outputs a synchronization signal for each byte of data, 90 is a shift register that transmits the synchronization signal of the counter 89 and shifts it for each lock, and 91 is a latch control circuit. This is a group of latch circuits that latch the output data of the shift register 90 using four latch control signals output from the shift register 90, each of which has an 11-bit configuration. Reference numeral 92 denotes an encoding circuit that encodes the latch data of each latch circuit group 91 using an OR circuit to obtain mark position data of 11 transmission bits, and reference numeral 93 denotes a latch circuit that latches mark position data for each byte.

According to this circuit configuration, the A/D converted transmission bit signal is latched by the latch circuit 81, the same data is always compared with the minimum value among the latch circuits 82 to 85, and the latch control circuit 88 The contents of 82 to 85 are updated for each transmission lock, and finally the four highest amplitude data in one symbol are held in the latch circuits 82 to 85. At the same time, a synchronizing signal of one symbol period from the counter 89 is transmitted and shifted for each lock, and is similarly recorded in the latch circuit group 91 by the latch control circuit 88, and then passed through the encoder circuit 92 and the latch circuit 93 in one symbol period. This is to acquire mark position data.

Returning to FIG. 9, of the one symbol output from the differential circuit 51, the four mark position data with the highest amplitude values of the signal among the channel bits, that is, the output of the latch 93, is input to the decoding ROM circuit 94. . The decoding ROM circuit 94 is
Based on the four mark position data, the data is decoded according to the conversion rules shown in FIG. 11 and output as read data.

The output of the decoding ROM circuit 94 transfers data decoded according to the conversion rules and a pointer indicating that input data does not follow the conversion rules (mark length is 4 transmission bits, etc.) and an out-of-modulation pattern is input to the protection circuit 96. The result is supplied to the track movement amount detection circuit 40. The function of the protection circuit 96 will be explained with reference to FIG. 101 is a gate that detects the nature of the symbol containing the access mark (in this example, all bits other than the 3rd to 8th transmission bits are fixed patterns); 100 is the gate that detects the character of the symbol containing the access mark; This is a previous value holding circuit that holds a value.The previous value holding circuit 100 also operates using the pointer.

The fact that the previous value holding circuit 100 has operated is inputted to the track movement amount detection circuit 40 via the gate 102 and transmitted to the protection circuit 96.
Whether or not to output data is selected depending on the access state. These protections can be used alone, in combination, or only for error detection, and by referring to this result, it is possible to effectively prevent malfunctions caused by inputting false information to the track movement amount detection circuit 40. can.

95 is a tracking error calculation circuit that inputs the amplitude data of each pair of wobble pits in a sample mark from the A/D converter 51, calculates the difference, and holds it until the next sample mark; the output of the circuit is D/A converted. Connected to circuit 43.

[Effects of the Invention] As described above, according to the present invention, in a 3.5-inch optical disc, the sample servo type 5.25
``Almost the same technology as optical disks can be used, so everything from disk recording materials to disk manufacturing techniques, as well as optical pickups and signal processing methods, can be shared.The data storage capacity is over 100MB, and the servo characteristics are the same. has been improved and high reliability can be achieved.

In particular, we have achieved an access mark that has higher track movement detection resolution than a 5.25-inch optical disc and can also detect the direction of movement. These marks can reduce the circuit size by using the same modulation as the signal, and use modulation rules to facilitate detection protection against false positives.
Faster access is possible.

[Brief explanation of drawings]

1 and 2 are a plan view and a schematic diagram of an optical information recording medium according to an embodiment of the present invention, FIG. 3 is an explanatory diagram of a data format of an embodiment of the present invention, and FIG. 4 is a diagram used in a conventional example. FIG. 5 is an explanatory diagram of the conventional data format. FIG. 6 is an explanatory diagram showing the relationship between the movement of the optical spot during access and the reproduced signal. FIG. 7 is an explanatory diagram of the data format of the conventional example. FIG. 8 is a block diagram of an example optical disk device. 9 and 10 show more details of the embodiment of FIG. 7. 1...Disc, 2...Virtual track, 3...Sample mark, 7.8...Wobbling pit. 9... Timing pit. 11...Access mark, 37...Digital processing circuit, 38...
・Detection decoding circuit, 40... Track movement amount detection circuit, 44...
... Control circuit, 50 ... A/D converter, 51 ... Differential circuit, 81 to 85 ... Latch circuit. 86...Selection circuit. 89...Pit counter. 90...Shift register. 94...Decoding ROM, 95...Tracking error calculation 96...
・Protection circuit. 1st Figure 2 Figure 3 Figure 5 Direct placement 123456 Fu 119012345123456
789012345Figure 6 ΔΔΔ Δ Δmouth ΔΔ Δ . 7o Figure 8 Figure 10 Data Modulation pattern data Modulation pattern Figure 11 data Modulation pattern data Modulation pattern Figure 11 data Modulation pattern data Modulation pattern 1tEl1 Figure data Modulation pattern data Modulation pattern Figure 12 123456 1aQjOjl 72345B 1
8111017 Track change direction Fig. 14 No. 45 111218171610 5
61314 9 3 2 1 7 8 14th
Figure No. 90 1117141310 4 1 7
121815 9 6 5 2 8 Figure 14 No. 135 1316101117181912
7 0 1 2 8 9 3 6 1st to 51:

Claims (10)

[Claims] (1) In a disk-shaped optical information recording medium, each track has a pair of pits that are shifted in opposite directions from the track center and have specific positions, and at least one pit that has one or more specific positions. A unique mark consisting of at least two or more pit groups that changes to
The mark is arranged discretely at equal angles along a concentric circle or a spiral track, and is composed of the pit group and a part of the pit group occupying a specific position, and is configured according to a modulation law when recording information. optical information recording medium. (2) In the optical information recording medium according to claim 1, the recording modulation method is N/M modulation (M
An optical information recording medium characterized in that the total number of the pit group and one of the pits occupying a specific position is N, using a modulation method in which marks are formed on N bits among the transmission bits. (3) In the optical information recording medium according to claim 1, the recording modulation method is 4/11 modulation (a modulation method that forms marks on 4 bits out of 11 transmission bits synchronized with a data transmission unit). an optical information recording medium, characterized in that the number of the pit groups is 3 and the total number of pits occupying a specific position is 4. (4) In the optical information recording medium according to claim 2, 4/11 modulation is used as the recording modulation method, the number of the pit groups is 3, the pit groups are arranged within 6 transmission bits, and a specific An optical information recording medium characterized in that the total number of pits including one pit occupying a position is four. (5) In the optical information recording medium according to claim 2, 4/11 modulation is used as the recording modulation method, the number of the pit groups is 3, and the pit group is the third transmission from the head of the fixed mark. 1. An optical information recording medium characterized in that the pits are arranged within six transmission bits starting from bit 1, and one of the pits occupying a specific position is located at the 11th transmission bit. (6) In the optical information recording medium according to claim 1, any one of the pits constituting each of the pit groups over a plurality of tracks changes its relative position between adjacent tracks by 1 in response to a change in the track. An optical information recording medium characterized in that the transmission bits are arranged so as to change and repeat periodically. (7) In the optical information recording medium according to claim 6, any one of the three pits constituting the pit group over a plurality of tracks changes its relative position between adjacent tracks according to a change in the track. 1 a continuous plurality of track groups that change and 2 one fixed bit always adjacent to the adjacent transmission bit when the relative position of the transmission bit changes, or 3 two fixed bits adjacent to each other always adjacent transmission bits when the relative position of the transmission bit changes 1 and a track group of racks or more are arranged so as to be periodically repeated. (8) A pair of pits that are shifted in opposite directions from the track center and have specific positions, at least one pit that has a specific position, and a group of at least two or more pits that change from track to track. Unique marks consisting of are arranged discretely at equal angles along concentric circles or spiral tracks, and marks consisting of the pit group and a part of the pit group occupying a specific position are used for modulation during information recording. In a recording and reproducing device using an optical information recording medium that follows the law, a peak detection circuit, a clock regeneration circuit,
A wobble pit detection circuit, a tracking error detection circuit, a track movement amount detection circuit, and a data demodulation circuit are provided, and the data demodulation circuit detects the mark position of the pit group and a part of the pit group occupying a specific position. A recording/reproducing apparatus for an optical recording medium, wherein a relative change in a reproduction position is detected by the track movement amount detection circuit based on the same result. (9) The recording and reproducing apparatus according to claim 8, further comprising a first protection circuit, wherein the data demodulation circuit detects the mark position of the pit group and a part of the pit group occupying a specific position, and performs data modulation. When detecting something that deviates from the rules,
A recording/reproducing apparatus for an optical recording medium, characterized in that a first protection circuit controls acceptance or rejection of an output result of a data demodulation circuit in the track movement amount detection circuit. (10) The recording/reproducing apparatus according to claim 8, further comprising a second protection circuit, wherein when the data demodulation circuit detects a mark position of the pit group and a part of the pit group occupying a specific position. A second protection circuit controls whether or not the output result of the data demodulation circuit is accepted in the track movement amount detection circuit based on the presence or absence of the same pit by checking the mark position of a part of the pit group occupying a specific position. A recording and reproducing device for an optical recording medium.