JPH02282976A - Optical information recording medium and recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the resolution of track moving quantity and to detect a moving direction by providing a mark which cyclically changes in accordance with the change of the track. CONSTITUTION:The spiral or concentrical tracks 2 are formed on a disk-like information recording medium 1 and sample marks 3 are cyclically provided on the tracks 2. The mark 3 is constituted of two bits(a 1st wobbling bit 7 and a 2nd wobbling bit 8) which are made to wobble in an opposite direction to each other on the virtual track 2, a timing bit 9 laid in the center 2 and an access mark 11 consisting of plural bits. Then, the mark 11 is constituted, for example, according to a 4/11 modulation rule. The arrangement of the bits is cyclically changed in accordance with the change of the track in the mark 11. In such case, one cycle consists of 16 tracks.

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 disk 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.

raga■, 1986. p112-p115. p239
- p. 242).

This format uses sample marks previously provided on the disc as shown in FIG.

Obtain tracking error signal and 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 playback are performed in synchronization with the extracted clock signal.The sample mark is located at the virtual track center 6
-1.6-2, ..., a pair of wobbling pits 7-1.7-2. which are off-track in opposite directions by 1/4 track pitch. ..., 8-1.8-2,
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, . . . located at the center of the track, and the timing pit 9 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. Where is the first wobbling pit 7?

The position 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 pits. 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 consists of 2 bytes of sample mark and 1
Since it is composed of a 6-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 pits per byte into 15 channel pits (=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 0, and of the other 14 channel pits, the two odd-numbered channel pits and the two even-numbered channel pits are 1. A maximum of four consecutive 1's can occur, but if an O is inserted between 1's, at least two 0's are included. (In the data byte division, there will be only one 0, but this is always 0, so it is not a problem.
) If there are consecutive O's, there will be a maximum of 17 O's, (
For example, if the data is expressed in hexadecimal as 00, EE,
The 1.2, 5.6, and 9° io, ia, and 14th channel pits of the first data are 1, and the others are 0. ) At the time of reproduction, the reproduced signal amplitude for each channel pit is detected, and the top two reproduced signal amplitudes are selected for each odd-numbered and even-numbered pit, 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/pit, and the disk rotation speed is usually 18
The number of sample marks per trunk rotation is 1376, which is not specified, and the sampling frequency is about 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. What is the detection limit for moving speed?

It is approximately 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.

It is configured as a 4/11 modulation standard modulation end. When recording and reproducing 4/11 modulation standard modulation terminal information, 1 byte of data (8
Refers to a modulation rule for projecting data (data pits) onto 11 transmission pits and converting them into patterns marked on the four transmission pits. Figures 11 (1) to (4) show examples of modulation tables, where the left column is information data and the right column is modulated 11
It is a pit pattern. Among the access marks 11, three of the four marks from the table are arranged in the third transmission pit to the fifth transmission pit, and the remaining one pit is arranged in the first transmission pit.
Select from the pattern group arranged in the 1st transmission pit and select the 11th transmission pit in the sample mark 3 as the 1st pit.
The wobble pit 7 is configured to have a wobble pit 7 of the type.

In this embodiment, the access mark 11 has a period of 16 tracks, in which the arrangement of pits changes periodically in response to changes in the track.

FIG. 3 shows the data format of the embodiment shown in FIG.

One track consists of 22 sectors.

One sector consists of 76 segments. 1 segment is
It 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.

Outer diameter is 80mm, including lead-in and lead-out areas, inner diameter is 46mm + outer diameter is 82mm, and the number of revolutions is 180.
In the case of Orpm, the linear recording density is 1°08 μm/pit (0,785 μm/channel pit), and 1672 sample marks per track circumference (sample period 50.
16kHz), and the user data capacity is 100MB or more.

Compared to the conventional example, the m 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 use 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. Also, the track moving speed detection limit is approximately 1 m/s since up to 16 tracks can be detected in one sample period. Since the recording area is 16 mm, the average access time is io, 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 one transmission pit seen from track 1 to track 16. (2) One fixed pit or sixth transmission pit seen from track 16 to track 1 change.

Relative position change of two transmission pits with .

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 property that in N/M modulation, there are only N marks in M transmission pits corresponding to 1 byte of data, and measures the signal amplitude of each M transmission pit 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,
The triangular portions showing the respective reproduced signals for c and d show the top four 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 pits, it is possible to
Even if the signal amplitude shown by the square in the figure increases and exceeds the signal amplitude of the 11th transmission pit, within the area of the access mark, 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 in the transmission pits.

As described above, in the present invention, the sampling period is improved to approximately 2'#J more than the conventional one, and the detection resolution of the track movement amount is improved without changing the data density or redundancy, while maintaining the track movement speed with the conventional performance. is one track, and an access mark whose direction can be detected can be realized. 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, and FIG. 13 shows access from the third transmission pit to the eighth transmission pit in FIG. 12. This is a symbolic representation of an example of a pattern to be inserted into a mark. The right column of (1) selects 3 marks for 6 transmission pits 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 pit between adjacent tracks, and shows 22 types of access marks expressed as symbols each time the track moves from left to right to an adjacent track. ing. Furthermore, the pattern obtained by one reversal and backward movement has the same properties.

An example of the third access pattern is shown in FIG. 14. Similar to FIG. 13, the access pattern of 6 transmission pits 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 changes in the relative positions of the two transmission pits. There are 202 types of 202 types that are constructed by performing symmetrical transformation about the axis, and then symmetrically transforming the mark pattern from the third transmission pit to the eighth transmission pit in the track direction about the axis between the fourth transmission pit and the fifth transmission pit. The pattern obtained by allowing the relative position change of the inner two transmission pits to occur no more than twice in 16 tracks is shown. these are,
It shows 22 types of access marks expressed by symbols each time moving from left to right to an adjacent track.

Furthermore, the pattern obtained by going backwards has the same properties.

The first example is a 16-track repeat pattern obtained by always placing fixed marks between the trunks and allowing a change in the relative position of 2 to 3 transmission pits, as in the third example. For each track, the mark pattern from the 3rd transmission pit to the 8th transmission pit is the 4th transmission pit and the 5th transmission pit.
Out of 528 types of patterns that are symmetrically transformed in the track direction with the axis between the transmission pits as an axis, two patterns that allow a change in the relative position of two transmission pits are divided into 16 trunks.
This was selected as the following. The access marks shown in the first, second, and third embodiments can all achieve the same effects as those shown in the first embodiment. moreover,
The pattern obtained by going backwards also has the same properties. 7th
The figure 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 passes the laser beam irradiated from the laser 22 through a collimating lens 23, a polarizing beam splitter 24, a quarter wavelength plate 25, and so on. The light is focused on the recording surface 27 of the disk 1 through the objective lens 26. 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 splinter 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 activates 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 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 re-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, which opens the actuator 42 in the tracking direction to control the objective lens 26. The amount of track movement and the speed and direction of track movement are detected from the decoded values of the marks. Reference numeral 44 denotes a control circuit composed of a microcomputer, which controls not only the entire drive device but also track access. Reference numeral 646 is a servo circuit for a linear motor for track access, which calculates the current position from the track movement amount output from the track movement amount detection circuit 40 and outputs a linear motor control voltage through the D/A converter 48. The optical pickup 2 is driven by the linear motor 47F according to the voltage.
1 in the track direction.

Reference numeral 60 indicates an opening circuit for the semiconductor laser 22, and reference numeral 49 indicates a data modulation circuit, which modulates the input recording data by 4/11 and converts it into serial data.The drive circuit #&60 converts it into a laser beam strength signal, and then outputs the data to the disc. A thermal change is generated on the recording surface of 1 to form pits 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 by converting the transmission pit amplitude into digital data. The reproduced signal converted into digital data is input to the difference circuit S1.

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 pit, 82 to 85 are latch circuits that latch data at mark positions in 11 transmission pits, 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. control circuit.

89 is a counter that counts with the transmission lock of 11 transmission pits and outputs a synchronization signal for each byte of data.At the start of 90 symbols, it sets 1" in the first pit and shifts by the synchronization signal of counter 89 for each transmission pit. It is a shift register that always indicates which transmission pit the A/D conversion input is in. 91 latches the output data of the shift register 90 by four latch control signals output from the latch control circuit. Each of the latch circuit groups has an 11-pit configuration, and each time data with a larger amplitude value is latched as a result of comparison of A/D conversion input, the transmission pit position is indicated. 92 is the latch data of each of the latch circuit groups 91. is encoded by an OR circuit to obtain mark position data for 11 transmission pits.The encode circuit compares the A/D conversion values of the first transmission pit, which is the last one in the symbol, and at the end of the comparison, it has four mark position information. Reference numerals 1 and 93 are latch circuits that latch mark position data for each byte.

According to this circuit configuration, the A/D converted transmission pit signal is latched by the latch circuit 81, and the same data is compared with the minimum value in the latch circuits 82-85.
The latch control circuit 8B transmits the contents of the latch circuits 82 to 85 and updates them for each lock.Finally, the top four data with the largest amplitude in the 1ti-symbol are transferred to the latch circuit 8B.
At the same time, a synchronizing signal of one symbol period from the counter 89 held in the units 2 to 85 is transmitted and shifted for each lock to the latch circuit section 91. Similarly, J-+1.n is recorded by the latch control circuit 88 at 7. The mark position is decoded in one symbol period through the encoder W&92 latch circuit 93.
-It is something that acquires evening.

Returning to FIG. 9, the signal amplitude in the channel pit of the 1-symbol, which is the output of the difference circuit 51, is IN! - of value
The four mark position data, ie, the output of the latch 93, are input to the decoding ROM circuit 94. Decryption ROM
In step 194, 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 is decoded I1 according to the conversion rule.
．． The data and human power input do not follow the conversion M1 rule (merger length is 4 transmission pits, etc.) The pointer is transferred to the protection circuit 9G without indicating that 15 patterns with less modulation have been input.The result is supplied to the track movement amount detection circuit 10. The function of the protection circuit 9 (″) will be explained in times 10, 1
01. is a game 1 that detects the nature of the symbol included in the access mark (in this example, a fixed pattern except for the 3rd to 8th transmission pits).
2 indicates an error in the mark.

]'', the previous value holding circuit 100 holds the previous value α of the data. The previous value holding circuit 100 also operates using the pointer.

[previous value holding circuit] 00 is in operation (that is, the game bow 02 is used to input the knife 1-rack movement amount detection circuit 40V, and the data output of the protection circuit 9G is selected depending on the access state. can be used alone, in combination with 1.-+, 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 1-rack movement amount detection circuit 40. Prevent it, what can you do?

Reference numeral 95 denotes a tracking error calculation circuit which inputs the amplitude data of each wobble pit pair in the sample mark from the A/D converter 51, calculates the difference, and holds the difference until the next sample mark, and the output of the same circuit. is connected to the D/A conversion circuit 143.

A second embodiment is shown in the 16th embodiment. In the embodiment S2, a selection circuit]05 is connected to the input of the difference detection circuit shown in FIG. Track position detection is performed, and the selector @ 105 inputs A/D conversion data, which is the amplitude value of the mark, as data input, and data that gives the maximum value of the mark in a pseudo manner (temporarily set as IN). Input three types of data that give the minimum value of the mark (temporarily set to ``0''), and enter
It has two data selection control inputs as shown in .

The energization/selection circuit 105 supplies the output of the A/I) converter 51 to the latch 8]. Controller Kai controls the selection circuit 105 to send data +l i 11 to the latch 81 at the timing of transmission pitch I·11 within the symbol containing the access mark 1- at the sample mark position. The control input port is a symbol including the access mark 11 at the sample 7 position, and a selection circuit is used to send data "'0" to latch f31 at the timing of transmission pit 1.2.9, ]0.
Control 5. The difference detection circuit connected to the output of the selection circuit 1.05 detects the four mark positions according to the operation explained in FIG. 13 and sends them to the decoding ROM 94. At this time, due to the effect of the selection circuit, in the symbol containing 7 access marks, the third
Three marks are selected from the 8th transmission pit, and the 7th position of i-, 4-v is detected by adding the first transmission pit 1-. As a result, detection is realized on the assumption that there is always a mark at the position of the transmission pit 11, and even under the conditions explained in Fig. 6, the access mark can be detected]1-
It is possible to detect four marks from among them with a low probability of erroneously detecting them.

There is also a configuration in which the data "0゛" manual input and control input port are deleted from [1 selection circuit] 05. In the case of 0, 2, 1j, from the 1st transmission pit to the 10th transmission pit 1-: 3-: Select the mark 4-) and add the 11th transmission pit.
position is detected. By verifying this result with the gates 101 and 102 explained in Fig. 10, if marks are detected in the 1.2 and 9.10 transmission pits due to defects etc., they can be determined to be symbols with low reliability. , it is possible to avoid adopting unreliable access marks.

[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.
More stable and 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. An explanatory diagram of a sample mark. FIG. 5 is an explanatory diagram of a 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 a block diagram of an optical disc device according to an embodiment of the present invention, and FIG. 9, 10, and 16 are more detailed block diagrams of the embodiment in FIG. 7, FIG. 11 is an explanatory diagram showing an example of a modulation table for 4/11 modulation, and FIGS. 12 and 13. , FIG. 14 and FIG. 15 are schematic diagrams showing examples of other access marks,
It is. 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, 105... Selection circuit 1st time Figure 2 Figure 3 p1 Figure 5 (1 shift A/port Δ Figure 6 mouth Δ Δ Figure 8 Δ Figure 10 Data modulation pattern Data modulation pattern Figure 11 Data Modulation Pattern Data Modulation Pattern Figure 11 Data Modulation Pattern Data Modulation Pattern 126 (07E1 1 1 l 1 ij/l (J/['1 1 on 1 Data Modulation Pattern Data Modulation Pattern Figure 12 j2: Id5LlrallfOH T234B6189TON Figure 14 Track change direction No. 22 No. 104

Claims (11)

[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 in N pits out of N transmission pits. (3) In the optical information recording medium according to claim 1, the recording modulation method is 4/11 modulation (a modulation method in which marks are formed in 4 pits out of 11 transmission pits 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 a recording modulation method, the number of the pit groups is 3, and the pit groups are arranged within 6 transmission pits, and 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. An optical information recording medium characterized in that six transmission pits are arranged starting from a pit, and one of the pits occupying a specific position is arranged as an eleventh transmission pit. (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 ~3 transmission pits 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, 2 One fixed pit always adjacent to the adjacent transmission pit when the relative position of the transmission pit changes, or 3 Two fixed pits adjacent to each other always adjacent to the adjacent transmission pit when the relative position of the transmission pit 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,
It includes a wobble pit detection circuit, a tracking error detection circuit, a track movement amount detection circuit, a mark position detection circuit, and a demodulation circuit that demodulates data using the output thereof,
The data demodulation circuit detects the mark position of the pit group and a part of the pit group occupying a specific position, and based on the same result, the track movement amount detection circuit detects a relative change in the playback position. A recording and reproducing device for an optical recording medium. (9) In the recording and reproducing apparatus according to claim 8, a difference detection circuit that uses the relative amplitude value of the mark is used to detect the mark position, and the mark position is detected from the pit group by difference detection, and a specific position is detected. 1. A recording and reproducing apparatus for an optical recording medium, characterized in that the mark position of a part of a pit group occupied is added and detected by the data demodulation circuit, and the relative change in the reproduction position is detected by the track movement amount detection circuit. (10) The recording/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 modulates the data. A recording/reproducing apparatus for an optical recording medium, characterized in that when a deviation from the rule is detected, a first protection circuit controls whether or not the output result of the data demodulation circuit is accepted in the track movement amount detection circuit. . (11) 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 a part of the pit group occupying a specific position with respect to the pit group. A second protection circuit controls the acceptance or rejection of the force result of the data demodulation circuit 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.