JPH01229427A - Optical information recording medium and recording/ reproducing device - Google Patents

Abstract

PURPOSE:To improve the resolution of the track shift value and to detect the track shift direction by allocating the wobbling pits and timing pits at the odd and even places respectively in a sample mark. CONSTITUTION:The spiral or concentrical tracks 2 are formed on an optical information recording medium 1 and the sample marks 3 are periodically put on the tracks 2 respectively. A mark 3 contains of two pits which are wobbled opposite to each other by 1/4 track pitch to a virtual track center 6, a 1st timing pit 9 set at the center 6, a 2nd timing pit 10 set at the middle between tracks, and an access mark 11 consisting of plural pits. In this case, the two wobbling pits and two timing pits are set at the channel bits of odd and even numbers respectively. Thus it is possible to decide the track shift direction at an access and to improve the resolution of the tack shift value.

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 Proceedings of Niss B.I.E., Volume 695, Optical Mass Data Storage ■, 198G, pp. 112 to 115 and 2
Pages 39 to 242 (Proceeding o
f 5PIE, vol 695.0ptical M
ass Data St.

rage u, 1986. p112-p115. p
239-p242).

In this format, as shown in FIG. 4, sample marks provided on the disk in advance 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
A pair of wobbling pits 7-1.7-2, . . . , 8-1.8-2 which are off-tracked in opposite directions by 1/4 track pitch relative to -1.6-2, . ,
・, timing pit 9- located in the center of the track
Consisting of 1.9-2,... wobbling pit 7
A tracking error signal is detected from the reproduction signal amplitude difference between and 8, and a clock is extracted from the timing pit 9. 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.

As for the data format, as shown in FIG. 5, one round of the track 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 sector identification information (ID)
The sector identification information (ID) is recorded using 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 bits per byte to 15 channel bits (=1 symbol) using a modulation method called 4/IS conversion, and is recorded in the data area between sample marks. The 4/15 conversion is detailed in the aforementioned literature. 4/15 modulation pit patterns are shown in FIGS. 6, 7, and 8. In 4/15 modulation, the 15th channel pit is always 0, and of the other 14 channel bits, two odd-numbered channel bits and 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. (During the data byte division, there may be only one O, but this is always an O, so there is no problem.) If O's are consecutive, a maximum of 17 zeros will follow.

During 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 4715 modulation conversion table.

The recording area of the disc has an inner diameter of 60 rn m and an outer diameter of 12 m.
0 mm, track density is 1.5 μm/)-rack, linear recording density is 0.95 μm/pit (0°5 μm
/ channel pit), the disc rotation speed is usually 1800r
pm, but it is not specified. The number of sample marks per track lap is 1376,
The sampling frequency will be 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. 4, the position of the first wobbling pit 7 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, in this method, the track movement at the time of 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.

Furthermore, since the data modulation pattern and the sample mark pattern are completely different, there is a problem that dedicated circuits are required for each, making it difficult to share them.

[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.

Another object of the present invention is to enable tracking error signals, track movement amounts, etc. to be easily detected using a data decoding circuit.

[Means for solving the problem] The above object is to provide marks that change periodically according to changes in the track, to form these marks in accordance with the data modulation side, and to form wobbling pits and timing pits. This is achieved by making it possible to easily detect the tracking error signal using the data decoding circuit by devising the arrangement.

[Operations] In general, sample servo type optical disk devices use sample marks provided periodically on the disk to
Perform the following three actions.

(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, by arranging the wobbling pits and timing pits in sample marks in odd and even numbers, it is possible to share the data decoding circuit, and furthermore, the wobbling pits and timing pits are arranged in odd and even numbers in the sample mark. By providing an access mark that changes, it is possible to improve the resolution of the amount of track movement and to detect the direction of movement.

[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 4/15 modulation is used as the data modulation method.

1 is a disk-shaped optical information recording medium according to the present invention, on which a spiral or concentric track 2 is formed, and sample marks 3 are formed on the track.
are provided periodically.

As shown in FIG. 2, the sample mark 3 consists of two pits (a first wobbling pit 7 and a second wobbling pit 7) which are wobbled by one quarter of the track pitch in opposite directions with respect to the virtual track center 6. wobbling pit 8)
A first timing pit 9 is placed at the virtual track center 6, a second timing pit 10 is placed at the center of the track, and an access mark 11 is made up of a plurality of pits.

The two wobbling pits are located in odd-numbered channel pits, and the two timing pits are located in even-numbered channel pits.

The pit arrangement used for the access mark 11 is the M pattern shown in FIG. 8 among the 4/15 modulation patterns, that is, the 4/15 modulation pattern.
Although it follows the /15 modulation rule, it is a pit array that is not used for recording or reproducing data. access mark 11
The pit arrangement changes periodically according to changes in the track. In this embodiment, one cycle consists of 16 tracks. Note that the access mark 11 is not limited to the pattern shown in FIG. 2, but may have a pattern as shown in FIGS. 18 and 19, for example. Furthermore, if a pit array used for recording and reproducing information is used instead of the M pattern shown in FIG. 8, a pattern as shown in FIG. 20 can be used.

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

One track consists of 22 sectors, and one sector consists of 8
Consists of 6 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.

Outer diameter is 80mm, including lead-in and lead-out areas, inner diameter is 46mm + outer diameter is 82mm, and rotation speed is 180mm.
In the case of 0 rpm, the linear recording density is 0°99 μm/pit (0.53 μm/channel pit), 1892 sample marks per track-period (sampling frequency 56.
76 kHz), and the user data capacity is 120 MB.

Compared to the conventional example, the linear recording density is about 5% 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. Further, by further setting virtual tracks between tracks, the user data capacity can be doubled. At this time, the second timing pit 10 is located at the center of the newly added track,
Good timing detection can be performed by the second timing pit 10.

The user data transfer rate is 3.9 Mb in the conventional example.
ps, this is a decrease of 2.7 Mbps. However, this is due to a decrease in the disk diameter, and can be increased by increasing the disk rotation speed.

The sampling frequency is approximately 1.5 times higher than the conventional one. This means that the number of sample marks per track-round is approximately 1.5.
Due to the fact that it has doubled. Therefore, in a feedback control system such as a track servo, a focus servo, and a clock regeneration PLL, the phase delay caused by the sampler is reduced to about two-thirds, and the stability is further increased.

The tracking error signal is transmitted from the first wobbling pit 7.
It is detected from the difference between the reproduction signal amplitude of the second wobbling pit 8 and the second wobbling pit 8. As is clear from FIG. 2, there are no pits in the first symbol of the sample mark except for the first and second wobbling pits 7.8 in the odd-numbered positions. Therefore, the tracking error signal can be easily detected using a circuit that demodulates data.

The first and second timing pits 9.10 can be used not only for clock recovery but also for other purposes. In the first symbol of the sample mark, there are no pits other than the first and second timing pits 9.10 at even numbered positions.

Therefore, using a data demodulating circuit, it can be easily determined from the difference in amplitude of the reproduced signal between two timing pits whether the optical spot is on a track or between tracks.

The amount of track movement is detected using access marks, and its resolution is one track. Since the access mark conforms to the data modulator, it can be decoded using a data demodulation circuit or method. Furthermore, the trunk moving speed detection limit is approximately 1°28 m/s since up to 15 tracks can be detected in one sample period. Recording area is 16mm
Therefore, assuming that acceleration and deceleration are performed at a constant acceleration, the average access time (travel time of one-third of a full stroke) is approximately 8.4 ms, and sufficient performance can be achieved.

As described above, in the present invention, the sampling period is 3
The data density and redundancy are almost unchanged, the tracking error signal and the signal indicating the position of the optical spot can be easily detected using a data decoding circuit, and the detection resolution of the track movement amount is is one track, and direction detection is possible. The detection limit for track moving speed is also sufficient for access.

FIG. 9 shows an embodiment of an optical disk recording and reproducing apparatus using the disk shown in FIG. 1 is an optical disc, and as shown in the first embodiment, a sample mark 3 is previously provided 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 semiconductor laser 22 into a collimating lens 23 and a polarizing beam splitter 24.
The light is focused on the recording surface 27 of the disk 1 through the wavelength plate 25 and 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 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 hold circuit which detects and holds the detected focus error signal (the value immediately after the second timing pit 10 so as not to be influenced by data or pits). 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. A peak detection circuit 35 detects the peak position of the reproduced signal corresponding to the first timing pit 9 from the reproduced signal detected by the amplifier circuit 31. 1st
As shown in FIG. 6, the reproduced signal also changes at the positions of the first wobbling pit 7, the second wobbling pit 8, and the second timing pit 10, and the peak detection circuit 3
The output of 5 also changes. However, the first and second wobbling pits 7.8, the first and second timing pits 9.1
The zero position does not change across the disk surface and always appears in a constant pattern even when no tracking servo is applied. Further, these pit groups can be identified because they appear at regular intervals, and the first timing pit 9 appears second among them. Therefore, the clock reproducing circuit 36 uses the peak signal corresponding to the first timing pit 9 and multiplies it by 150 to extract a clock for recording and reproducing data. Similarly, when recording and reproducing between tracks, the peak signal corresponding to the second timing pit that appears third is used to extract a clock for recording and reproducing data. The period of sample mark 3 is 56.76kHz (at 1800 rpm)
The tarok frequency is 8.514 MHz. The output of the clock regeneration circuit 36 is sent to the digital processing circuit 37.
used as a clock.

38 is a detection/decoding circuit that detects the maximum value of the reproduced signal amplitude in each symbol, the next rank, and its position, and decodes the data. Details of this circuit will be described later. 43 is a D/A converter, and 41 is a tracking 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 trunk movement am and the 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.

48 is a drive circuit for the semiconductor laser 22, and 49 is a data modulation circuit, which modulates the input recording data by 4/15 and converts it into serial data. A thermal change is generated on the recording surface to form pits and record data.

The detection/decoding circuit 38 will be explained using FIG. 10 and FIG. 12.

First, in FIG. 10, a reproduced signal is inputted as a digital value by an A/D converter 50 to a detection/decoding circuit 38.

The digitalized reproduced signal is transmitted to the distributor 52.
The even-numbered data of the channel pit is sent to the differential circuit 51-1.
Then, the odd-numbered data is distributed to the difference circuit 51-2. The differential circuit 51-1 and the differential circuit 51-2 have the same configuration, and FIG. 12 shows the configuration.

In FIG. 12, the counter 60 counts up for each channel pit, and counts up 15 channel bits, or 1 channel bit.
When it counts up to the symbol, it returns to O, and at that time outputs a carry (output indicated as C). Moreover, the number of counters 60 corresponds to the channel pit number. Carry is the clock input of output latch 68.69.70.71,
Provided to clear latches 63,64. Latch 63 and latch 64 are therefore cleared every 15 lupits, and output latches 68, 69, 70, 71 are cleared every 15
Each input data is latched for each channel bit.

Comparator 65 compares the output of latch 63 and the output of latch 64, and when the output of latch 63 is smaller, outputs C!
Set it to lx++. The selector 66 selects the data of the A input, that is, the output of the latch 63 when the S input is '1'', and the data of the S input, that is, the output of the latch 63 when the S input is II OII.
Output the output of 4 to Y. Therefore, the selector 66 is
Either the output of the latch 63 or the output of the latch 64, whichever is smaller, is output.

The data from the distributor 52 is the output of the selector 66.

That is, the comparator 67 compares the output of the latch 63 with the output of the latch 64, whichever has a smaller value, and when the data from the distributor 52 is large, the carry (C)
Let the output be 11111. AND circuit 73 connects comparator 6
The carry of 5 and the carry of comparator 67 are ANDed and sent to the clock inputs of counter latch 61 and latch 63. The carry of the comparator 6S is uiu when the output of the latch 63 is smaller than the output of the latch 64, and when the data from the distributor 52 is smaller than the output of the latch 63, the carry of the comparator 67 is 1''' Therefore, when the output of the latch 63 is the smallest among the output of the latch 63, the output of the latch 64, and the data from the distributor 52, the latch 63 latches the data from the distributor 52, and simultaneously latches the data from the distributor 52. The channel pit number of the data is latched by the counter latch 61.Similarly, the AND circuit 72 performs an AND operation on the invert of the carry of the comparator 65 and the carry of the comparator 67, and performs an AND operation between the counter latch 62 and the latch 6.
4 clock input. As a result, when the output of the latch 64 is the smallest among the output of the latch 63, the output of the latch 64, and the data from the distributor 52, the data from the distributor 52 is taken into the latch 64, and at the same time the data is The channel pit number is latched by a counter latch 62.

As described above, the latch 63 and the latch 64 always hold the maximum value and the next value of the signal, and the counter latch 61 and the counter latch 62 hold the number of the channel pit to which the value is given, respectively. Further, the outputs of the counter latch 61, the counter latch 62, the latch 63, and the latch 64 are output from the output latches 68, 69, 7Q, and 71, respectively.
Accordingly, every 15 channel bits, that is, every 1 symbol, is latched. Therefore, the output latch 68.69
．． 70.71 is 1 symbol (=15 channel pits)
The maximum value of the signal, the next value, and the number of the channel pit that provides these values are determined.

Returning to FIG. 10, the output of two numbers that take the maximum value and the next value of the signal in even numbered channel pits in one symbol, which is one of the ways of outputting the difference circuit 51-1, and the difference Outputs of two numbers that take the maximum value and the next value of the signal in odd-numbered channel pits of one symbol, which is the output of the circuit 51-2, are input to the decoding circuit 53. .

The decoding circuit 53 decodes data based on these four channel pit numbers and according to the conversion rules shown in FIGS. 6, 7, and 8.

The subtraction circuit 55-2 receives 1, which is the output of the difference circuit 51-2.
A tracking error signal is output based on the maximum value and next value of the signal in the odd-numbered channel pits of the symbol, and the numbers of the channel pits that take these values. The subtraction circuit 55-1 calculates off-track from the maximum value of the signal in the even-numbered channel pits of one symbol output from the difference circuit 51-1, the next value, and the number of the channel pit that takes those values. Output quantity data. Subtraction circuit 55-
1 and the subtraction circuit 55-2 have the same configuration. The operation will be explained with reference to FIGS. 11, 13, 14, and 15.

FIG. 13 shows reproduction signals of two wobbling pits and two timing pits when the light spot follows a trajectory from I to H with respect to the virtual track center 6. Note that the arrow indicating the locus in the figure represents the center of the light spot. Among the reproduction signals of each pit in the trajectory A shifted by 172 tracks toward the inner circumference, the reproduction signal of the second timing pit 10 is the largest, the reproduction signal of the first timing pit 9 is the smallest, and the two wobbling pits are at the same level. It has become. Among the playback signals of each pit at the trajectory entrance that has been tracked 1/4 to the inner circumference side, the playback signal of the first wobbling pit 7 is the largest, the second wobbling pit 8 is the smallest, and the two timing pits are at the same level. Among the reproduction signals of each pit on the trajectory passing through the center of the virtual track, the reproduction signal of the first timing pit 9 is the largest, the second timing pit 10 is the smallest, and the two wobbling pits are at the same level. It has become. Of the reproduced signals of each pit in trajectory 2 shifted by 174 tracks toward the outer circumference,
The reproduction signal of the second wobbling pit 8 is the largest,
The first wobbling pit 7 is the smallest, and the two timing pits are on the same level. 17 on the outer circumference
Among the reproduction signals of each pit in the locus after two tracks, the reproduction signal of the second timing pit 10 is the largest, the reproduction signal of the first timing pit 9 is the smallest, and the two wobbling pits are at the same level. , this is the same as locus A, and is repeated below. FIG. 14 shows the reproduction signal level of each pit for the track. In each case, g is the regeneration of the first wobbling pit 7, h is the first timing pit 9, i is the second wobbling pit 8, and j is the regeneration of the second timing pit 10 relative to the deviation from the track center. It represents the signal level response. Here, it is assumed that k=g−i and 1=h−J. k is the reproduction signal amplitude difference between the two wobbling pits, which is O at the center of the track, 0 when the light spot shifts from the center to the inner circumference, and - when the light spot shifts from the center to the outer circumference.
Changes to Therefore, if the signal k is used as a tracking error signal and the light spot is controlled to move to the inner circumferential side when the signal k is - and to the outer circumferential side when the signal k is ten, tracking will always be performed at the center of the track. On the other hand, signal 1
is the difference between the two timing pits, which is 10 at the center of the track and - between the tracks, and since the positive/negative inversion occurs at 1/4 off-track, it can be used to determine on-track.

The first symbol of the sample mark with two wobbling pits and two timing pits has no other pits. Therefore, since both of the two wobbling pits are in odd-numbered positions, the maximum value and the next value of the signal in the odd-numbered channel pits of one symbol output from the differential circuit 51-2 are the two wobbling pits. A tracking error signal can be obtained by the subtraction circuit 55-2 based on the maximum value, the next value, and the number of the channel pit that takes these values. Similarly.

The subtraction circuit 5S-1 calculates the signal based on the maximum value of the signal in the even-numbered channel pits of one symbol output from the difference circuit 51-1, the next value, and the number of the channel pit that takes these values. Generate 1.

FIG. 11 shows the configuration of the subtraction circuit 55.

The four outputs of the difference circuit 51-1 and the difference circuit 51-2 are the maximum value and next value of the signal among the odd numbered and even numbered channel pits in one symbol, and the number of the channel pit that takes those values. It consists of two things. In FIG. 11, d and e, b and C are the corresponding signal levels and channel pit numbers, respectively.

A comparator 56 compares the two channel pit numbers. The smaller number among these is the number of the first wobbling pit 7 or the first timing bit 9. The output C becomes "0" when b is larger than C, and becomes uiu when b is smaller than C. Selector 57 and selector 58 have S inputs of 1111
When it is 1, input A is outputted, and when the S input is lIQ++, input B is outputted to Y. A subtracter 59 subtracts the output of the selector 58 from the output of the selector 57 and outputs it to Y. therefore,
When the channel pit number is smaller than C, the subtracter 59
The output of is the value obtained by subtracting the signal level e from the signal level d, that is, the output of the first wobbling pit 7 or the first
Data is obtained by subtracting the level of the second wobbling pit 8 or the second timing bit 10 from the level of the timing bit 9.

Another embodiment of the present invention will be described with reference to FIGS. 14, 15, and 17. In this embodiment, the subtracter 55 on the actual flow side in FIG. 9 is changed to the configuration shown in FIG. 17, and the control circuit 91
, selector 93 is added to control the movement of one track, and other parts are the same as the embodiment shown in FIG.

In FIG. 17, 90-1 and 90-2 are subtracters replacing the subtracter 55-1 and 55-2 in the embodiment of FIG. 9, and 93 is a subtracter 90-1 and a subtracter 90-2. A selector 91 selects and outputs one of the outputs of the subtracters 90-1 and 90-2, and a selector 91 controls the XOR circuit 94 and the selector 93 inside the subtracters 90-1 and 90-2 to execute a one-track shift @ operation. It is a control circuit. Subtractor 90-
1 and subtractor 90-2 are the same as the subtracter shown in the first embodiment except for the XOR circuit 94.

The XOR circuit 94 inverts the output of the comparator 56 when the control signal from the control circuit 91 is 1'', and the control signal becomes 11011.
In this case, the output of the comparator 56 is output as is. When the output of the comparator 56 is inverted by the XOR circuit 94, when the channel pit number is smaller than C, the output of the subtracter 59 becomes a value obtained by subtracting the signal level d from the signal level e.
That is, the data obtained by changing the level of the first wobbling pit 7 or the first timing pit 9 from the level of the second wobbling pit 8 or the second timing pit 10 is output from the output of the subtractor 59. .

This is the normal output (when the output of the comparator 56 is not inverted by the XOR circuit 94) with the positive and negative inverted. Therefore, the outputs of the subtracters 90-1 and 90-2 can be inverted under the control of the control circuit 91.

Figure 14 shows the moving operation of one track in the above configuration.
This will be explained with reference to FIG. The signal in FIG. 14 is the output of the subtracter 90-1 which is outputted via the selector 93 without being inverted, and is a normal tracking error signal. The output of the subtracter 9Q-1 is inverted and outputted as a signal -.

The signal l is sent to the selector 9 without inverting the output of the subtractor 90-2.
This is the output via 3. The output of the subtracter 90-2 is inverted and output as signal -1. In FIG. 15, the upper part shows the output of the selector 93 when moving one track in the inner circumferential direction. The control circuit 91 performs the following selection sequence. First, a virtual truck center 9
5, the signal -1 is selected, and when the signal -1 becomes 0, the signal -k is selected. Next, when signal -k becomes 0, signal 1 is selected, and when signal 1 becomes O, signal k is selected.
Return to Since the tracking control moves the light spot to the inner circumference when the signal is negative, the above selection operation moves the light spot to the trunk 96 as shown in FIG. When moving from the track center 95 to the track center 97 located one track outside, the signal 1 is selected first, and when the signal 1 becomes 0, the signal -k is selected in the same manner.

Next, when signal -k becomes 0, select signal -1,
When the signal -1 becomes 0, it returns to the signal k.

According to this embodiment, since it is possible to move to an adjacent track while keeping the tracking control active, there is no need to perform a complicated track jump operation, which has the effect of improving earthquake resistance.

In the embodiment shown in FIG. 9, a reflected light amount signal from the disk is used as a reproduction signal, but the present invention can be used as is even when using the magneto-optical effect, only the inspection system for the reproduction signal is different.

In the embodiments shown in FIG. 1 and below, 4/15 modulation is used as the modulation method, but the same effect can be obtained with other modulation methods such as 4/14 modulation as long as they have the same characteristics.

[Effects of the Invention] As described above, according to the present invention, almost the same technology as that for a 5.25-inch optical disc can be used for a 3.5-inch optical disk disc, and therefore, the recording material of the disc can be , disc manufacturing technology, and even optical pickups and signal processing methods can be shared.

The data storage capacity is over 100 Mbytes, and the servo characteristics are improved and reliability is high. Furthermore, the resolution for detecting the amount of track movement is higher than that of a 5.25-inch optical disk, and the direction of movement can also be detected, allowing faster access.

Further, the tracking error signal can be easily detected using the data decoding circuit, and the data decoding circuit can also be used to detect whether the track is on or off.

The access mark can also be detected by the data decoding circuit itself, and the amount and direction of movement of the track can be easily detected.

Furthermore, since the access mark does not appear in the data, it is possible to distinguish it from the data, thus making it easy to detect the data and the sample mark, even though the specificity of the sample mark is lost.

[Brief explanation of the drawing]

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. Figure 5 is an explanatory diagram of the conventional data format, Figures 6, 7, and 8 are 4/1
5 modulation conversion table, FIG. 9 is a block diagram of an embodiment of the optical disk recording/reproducing apparatus according to the present invention, and FIGS. 10, 11, and 12 are more detailed block diagrams of the embodiment of FIG. 9. , FIG. 13, and FIG. 14 are explanatory diagrams of the operation of the three tracking devices according to the embodiment of the present invention, FIG. 16 is an explanatory diagram of the operation of the clock recovery circuit of the present invention, and FIG. 17 is a block diagram of another embodiment. 15 are operational explanatory diagrams of other embodiments, and FIGS. 18, 19, and 20 are schematic diagrams showing other embodiments of FIG. 2. 1...disc. 2... Virtual track, 3... Sample mark, 7.8... Wobbling pit, 9.10... Timing pit, 20...
- Spindle motor, 21... Optical pickup 22... Semiconductor laser, 38... Detection/decoding circuit, 40... Track movement amount detection circuit. 44... Control circuit, Figure -, ', '- (changed internally, 50) 1.3.54. ) Cut command + O + a: Hit υ1t, KoQ3Lt (Si4
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Tomoe-Heo Procedural Amendment (Method) % Formula % Name of the invention Optical information recording medium and recording/reproducing device Person who makes the amendment 1 Relationship with the Patent Applicant Name 4510) f Final Ceremony: t Day
Subject of amendment to Figures 1, 4, and 13 of drawings Figures 1 and 4 originally attached to the application.

Claims (10)

[Claims] (1) In a disk-shaped optical information recording medium, unique marks including a pair of pits shifted in opposite directions with respect to the track center are provided on the track at equal intervals, and if each of the pit pairs An optical information recording medium characterized in that it is arranged at an odd numbered position or an even numbered position and does not change depending on changes in the track. (2) In a disk-shaped optical information recording medium, the first
Unique marks are provided on the track at equal intervals, including a pair of pits in which a pit is located at the center of the track and a second pit is shifted in a direction across the track by about half the track pitch, An optical information recording medium characterized in that each pair is arranged at an odd numbered position or an even numbered position. (3) In a disk-shaped optical information recording medium, approximately 4 of the track pitch in opposite directions with respect to the track center.
A first pit pair consists of two pits shifted by one-tenth of a pitch, and a second pit pair has two pits in which the first pit is located in the center of the track and the second pit is shifted in the direction across the track by about half the track pitch. A unique mark containing two pairs of pits,
Provided on the track at equal intervals, the first pit pair is located at an odd numbered position, the second pit pair is located at an even numbered position, or the first pit pair is located at an even numbered position, and the second pit pair is located at an even numbered position. An optical information recording medium characterized in that: is arranged at an odd numbered position. (4) In a disk-shaped optical information recording medium, a unique mark consisting of four pits located at the center of the track is provided on the track at equal intervals, and the four pits are arranged according to the data modulation law. . An optical information recording medium, wherein the arrangement of the four pits changes periodically according to changes in the track. (5) In the optical information recording medium according to claim 4, the four pits are arranged in accordance with the data modulation law and in a form that does not exist in the data, and the four pits are arranged in accordance with the data modulation law and in a form that does not exist in the data. An optical information recording medium characterized in that the arrangement changes periodically. (6) Unique marks including first and second pits shifted in opposite directions with respect to the track center are provided on the track at equal intervals, and each pair of pits is located at an odd or even numbered position. A recording and reproducing apparatus using a disc-shaped optical information recording medium arranged, comprising a distribution circuit, a difference circuit, a subtraction circuit, and a decoding circuit, and the apparatus is configured to detect reproduction signal amplitude values of the first and second pits. The distribution circuit selects and inputs the signals to the difference circuit, the difference circuit detects the reproduction signal amplitude values and pit positions of the first and second pits, and the subtraction circuit detects the reproduction signal amplitudes of the two pits. A tracking error signal is detected from the value, and similarly selected by the distribution circuit, the reproduced signal amplitude value is inputted to the difference circuit, and the difference circuit detects the maximum value, the next value, and the position of the reproduced signal amplitude value. A recording/reproducing apparatus for an optical information recording medium, characterized in that the decoding circuit decodes data. (7) A unique mark including a pair of pits in which the first pit is located at the center of the track and the second pit is shifted in the direction across the track by about half the track pitch;
In a recording/reproducing device using a disk-shaped optical information recording medium, in which the pit pairs are provided on tracks at equal intervals and are arranged at odd-numbered or even-numbered positions,
A peak detection circuit, a clock recovery circuit, a distribution circuit,
comprising a difference circuit, a subtraction circuit, and a decoding circuit;
Alternatively, the peak of the second pit is detected by the peak detection circuit, the clock is regenerated by the clock regeneration circuit, the reproduced signal amplitude values of the first and second pits are selected by the distribution circuit, and the difference circuit , the difference circuit detects the reproduction signal amplitude values and pit positions of the first and second pits, the subtraction circuit detects the position of the optical spot from the reproduction signal amplitude values of the two pits, Similarly, the distribution circuit selects and inputs the reproduced signal amplitude value to the difference circuit, the difference circuit detects the maximum value and next value of the reproduced signal amplitude value and its position, and the decoding circuit decodes the data. A recording/reproducing device for an optical information recording medium, characterized in that: (8) A first pit pair consisting of two pits shifted by about a quarter of the track pitch in opposite directions with respect to the track center; and a second pit pair with the first pit located at the track center; Unique marks are provided on the track at equal intervals, including a second pair of pits that are offset in a direction across the track by about half the track pitch, and the first pair of pits is placed in an odd-numbered position, In a recording/reproducing apparatus using a disk-shaped optical information recording medium in which pit pairs are arranged at even numbered positions, or the first pit pairs are arranged at even numbered positions and the second pit pairs are arranged at odd numbered positions. , comprising a peak detection circuit, a clock regeneration circuit, a distribution circuit, first and second difference circuits, first and second subtraction circuits, and a decoding circuit, and comprises one of the second pit pairs. detecting a peak of a pit with the peak detection circuit, regenerating a clock with the clock regeneration circuit, and selecting reproduced signal amplitude values of the first and second pits of the first pit pair with the distribution circuit. input to the first difference circuit;
detecting reproduced signal amplitude values and pit positions of the first and second pits of the first pit pair with the first difference circuit;
The first subtraction circuit detects a tracking error signal from the reproduced signal amplitude values of two pits of the first pit pair, and calculates the reproduced signal amplitude values of the first and second pits of the second pit pair. selected by the distribution circuit and input to the second difference circuit, and the second difference circuit detects reproduced signal amplitude values and pit positions of the first and second pits of the second pit pair; The second subtraction circuit detects the position of the optical spot from the reproduced signal amplitude values of the two pits, and similarly the distribution circuit selects an odd numbered value or an even numbered value of the reproduced signal amplitude value. input to the first or second differential circuit, the two differential circuits detect the maximum value and the next value of the reproduced signal amplitude values of the odd-numbered values and even-numbered values, and the position thereof, and the decoding circuit detects A recording/reproducing device for an optical information recording medium, characterized in that it decodes data. (9) A unique mark consisting of four pits located at the center of the track is provided on the track at equal intervals, and the four pits are arranged according to the data modulation law, and the four pits are A recording/reproducing apparatus using a disk-shaped optical information recording medium in which the arrangement of the four pits changes periodically, comprising a detection decoding circuit and a track movement amount detection circuit, the detection decoding circuit detecting the four pits. The unique mark pattern is detected by detecting the reproduction amplitude value and the pit position, the track movement amount is detected from the pattern signal of the unique mark by the track movement amount detection circuit, and the data is detected by the detection decoding circuit. A recording and reproducing device for an optical information recording medium, characterized in that it also performs decoding. (10) A first pit pair consisting of two pits shifted by about a quarter of the track pitch in opposite directions with respect to the track center; and a second pit pair with the first pit located at the track center; Unique marks are provided on the track at equal intervals, including a second pair of pits that are offset in a direction across the track by about half the track pitch, and the first pair of pits is placed in an odd-numbered position, In a recording/reproducing apparatus using a disk-shaped optical information recording medium in which pit pairs are arranged at even numbered positions, or the first pit pairs are arranged at even numbered positions and the second pit pairs are arranged at odd numbered positions. , comprising a difference circuit, a subtraction circuit, a polarity inversion circuit, a selection circuit, and a control circuit, and the difference circuit calculates reproduction signal amplitude values and pit positions of the first and second pits of the first pit pair. , the subtraction circuit detects a tracking error signal from the reproduced signal amplitude values of the two pits of the first pit pair, the polarity inversion circuit inverts the polarity of the detected tracking error signal, and in the same manner. The difference circuit detects the reproduction signal amplitude values and pit positions of the first and second pits of the second pit pair, and the subtraction circuit detects the reproduction signal amplitude values of the two pits of the second pit pair. A tracking error signal is detected, the polarity of the detected tracking error signal is inverted by the polarity inversion circuit, one of the two tracking signals is selected by the selection circuit, and the polarity of the tracking error signal is selected by the control circuit. A recording/reproducing apparatus for an optical information recording medium, characterized in that a track is moved by sequentially switching and controlling which tracking error signal to select.