JPS6069865A - Disc device - Google Patents

Abstract

PURPOSE:To prevent data from being recorded in a block having a high error probability, by recording preliminarily address data of defective blocks in the prescribed recording area on a disc. CONSTITUTION:A control circuit 15 uses a timer 22 and a timer 23 to detect head frames of individual blocks and detects defective blocks and stores detection results in a storage circuit 16. When the detection of the last block is closed, the control circuit 15 reads out defective block data in the storage circuit 16 and calculates addresses of defective blocks and the number of continuous defective blocks in accordance with this data and drives a laser driver 21 in accordance with calculated data to record this data. Then, defective block addresses and the number of continuous defective blocks are recorded in a defective block management information recording area on an optical disc 1. Thus, defective block data is referred to record data in blocks other than defective blocks when data is recorded on the optical disc 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk device such as an optical disk device that records or reproduces information onto or from an optical disk.

[Technical background of the invention]

In recent years, image information such as documents, which are generated in large quantities, is photoelectrically converted by two-dimensional optical scanning, and this photoelectrically converted image information is stored in an image storage device1.7, or it can be retrieved as needed. Recently, optical disk devices have been used as image storage devices in image information file devices that can reproduce and output images as hard copies or soft copies.

Conventionally, such an optical disk device WE uses an optical disk that stores information in a spiral manner, and records or reproduces a large amount of information using an optical head that moves linearly in the radial direction of the optical disk using a linear motor. In the optical disks mentioned above, the spiral or concentric tracks are divided into blocks of fixed length data, and block address information is recorded in advance at the beginning of each block. [Problems with the background art] 1. However, in the above optical disk device,
Since data is recorded in each block, there is a possibility that data will be recorded in defective blocks where data cannot be recorded accurately due to dents or scratches, resulting in the problem of poor data reliability. Ta.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to improve the reliability of recorded data by preventing data from being recorded in blocks on the disk that have a high probability of error. There is a need to provide disk devices.

[Summary of the Invention] In the present invention, address data of a defective block is recorded in advance in a predetermined recording area on a disk.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an optical disk (disc) 1 is connected to a motor 2.
It is designed to be rotationally driven by. As shown in FIG. 2, the optical disc 1 has a donut-shaped metal coating layer such as tellurium or bismuth coated on the surface of a circular substrate made of, for example, glass or plastic. A notch, that is, a reference position mark of 1°, is provided near the center of the layer. Further, on the optical disk 1, the reference position mark II is set at 1.
It is divided into 256 sectors of 10 to 255'' by 0'' and 17''.

On the optical disk 1, fixed length information is recorded over a plurality of blocks.
300,000 blocks of information are recorded on the 36,000 tracks above. The number of sectors in one block on the optical disc 1 is, for example, 40 sectors on the inner side and 20 sectors on the outer side. Also, each block is the sector switching position [ending with N,
If not, a block gap is provided, as shown by the O-th block and the t1 block shown in FIG. 2, so that each block always starts from the sector switching position. A block header A consisting of a block number, track number, etc. is recorded at the start position of the block, for example, when the optical disc 1 is manufactured.

Further, as shown in FIG. 3, the optical disc 1 is composed of a non-recording track area 1a, a user-inaccessible area Ib, and a user-accessible area ICK from the innermost track. - One-track recording track area 1a consists of, for example, the innermost 10 tracks, and is provided as a margin area for detection and eccentricity correction of the innermost track. The above user-inaccessible area IC
When accessing, the optical head 12, which will be described later, is accessed, so it is made up of blocks corresponding to an access error, and is made up of, for example, 200 blocks (hex). In each block of this user-inaccessible area 1b, only the block header name is recorded.

The user accessible area IC is composed of a defective block management information recording area 1d and a data block recording area 1e. In the defective block management information recording area 1d, defective block management information consisting of the (start) address of the defective block and the number of consecutive defective blocks is recorded. The defective block management information is recorded as shown in Table 1, for example.

Table 1 m4 diagram (al, (bl) is 8 self-f-+ along the track groove on the optical disk 1, and indicates the recording former format of the RuPro. The above block shows the block header area and data. The block header area is composed of 39 bytes of preamble data indicated by 'B3', a preheader consisting of 8 frames, and an additional recording header consisting of 4 frames. Between the pre-header and the additional aLr record, there is one frame with a splice gap caused by a time lag.

The above pre-header is a header that is written in advance before the user records data on the optical disc 1, and the additional recording header is a header that is written after the pre-header of that block and before the encoded data when the data is recorded in this block. Each frame of the above header consists of 39 bytes,
It consists of a 1-byte header frame synchronization code, 8-byte forward and reverse polarity header address data, and 22-byte dummy data 'B3'. For example, if positive polarity is rloloJ, reverse polarity is 1. Reverse the polarity. It has become a rololJ. The above header address data is a 1-byte frame number in the header,
It consists of a 3-byte block number, a 2-byte track number, and a 2-byte data '00' as dummy data. The frame number in the header is a number for identifying 12 frames in the same block header, and is divided into 4 digits from 1 to 12 to 7118. The above header frame synchronization code is, for example, 'B3' data modulated 2-7 1. [0100100OOOQOO1
The data 00-1 is now recorded.

In addition, a frame with a splice gap includes a 1-byte header frame synchronization code on the pre-header side, 8-byte forward and reverse polarity head/end address data, 2-byte dummy data, and a 2-byte splice gap. It consists of 18 bytes of dummy data on the recording side and the ivy side.

The data area consists of 152 data frames, and each data frame consists of a 1-byte frame synchronization code and 38 bytes of frame extraction data. , J-record frame synchronization code is, for example, I'0100100 (10000
The data 1000j is recorded at 81:. As a result, the fixed length data in the data block is divided into 152 fixed length data, and each frame is given an ECC code (error correction code) for error checking. It has become.

The motor 2 shown in FIG. 1 is a Hall motor whose rotational speed is controlled by a speed control section 17, which will be described later.The shaft 3 of the motor 2 has a shaft 3, as shown in FIG.
A disk 4 on which signal generation marks 4M are provided at regular intervals is fixed, and the marks 4M on this disk 4 are optically detected by a detector 7 consisting of a light emitting diode and a light receiving element. ing. Further, a detector 8 consisting of a light emitting diode and a light receiving element is provided below the disk 1 to optically detect the reference position mark. - The output of the output light receiving element of the detector 7 is supplied to the clock pulse input line of the sector counter 10 via the amplifier 9 17, and the reset input line of the sector counter 10 is connected to the clock pulse input line of the sector counter 10. The output of the light receiving element is supplied via the amplifier section 11 to the output terminals 1 to 1.

Further, an optical head 12 for recording and reproducing information is provided below the optical disc 1 so as to be movable in the radial direction of the optical disc 1. This optical head is well known and includes, for example, a semiconductor laser oscillator, a collimating lens, a beam splitter, a quarter-wave plate objective lens, a light receiver, and the like. To the above optics 4
The output of the output terminal 12 is supplied to a digitizing circuit 13, and the signal binarized by the binarizing circuit 13 is demodulated by a demodulating circuit 14 and supplied to a control circuit 15. This control circuit 15 controls the entire apparatus in response to signals from an external device, that is, a post computer (not shown). For example, when the control circuit 1.5 is supplied with a block number for recording or reproducing, the control circuit 1.5 sends a signal to the memory circuit 16.
The track number to be accessed and the starting sector number of 130 are calculated according to the conversion table set in p.

As shown in FIG. 6, the 314 memory circuit 16 has 256
Information on the speed of the optical disc 1 for each track, the number of sectors in one block at this speed, and the number of sectors in one block at this speed.
A conversion table is stored in which the number of the first block in a No. 56 track corresponds to the starting sector of that block. For example, when the control circuit 15 is supplied with block number "10" from the host computer, the block number is set to 0 according to the memory contents of the memory circuit 16.
~255 tracks, the block number of the first block in that track is "0" and the starting sector is "0".
0", the number of sectors in the second block is "40", and the number of tracks and the number of sectors of the block number rlOj are calculated accordingly. In other words, "((target program number - first block number) x number of sectors l - starting sector) ÷
256+track number of the first block], the quotient obtained is the number of tracks and the remainder is the number of sectors, and in this case, the track number (11, start sector r144J is calculated 11.).

The control circuit 15 rotates the motor 2 so that the track of the optical disk 1 relative to the optical head 12 has a constant linear velocity by controlling the speed control unit 17 according to the speed information obtained at the time of access. It is something that can be enjoyed. Further, the control circuit 15 calculates the track number l,
Convert to the scale value of the track number 1-5,
This scale value and illustration 1. The linear motor driver 18 is driven and controlled until the position detected by the output of the position detector matches the position detected. The linear motor driver 18 is configured to move the optical head 12 using a linear motor mechanism 19 under the control of the control circuit 15, so that the light beam from the optical head 12 is caused to follow a predetermined track in principle. The linear motor mechanism 19 moves the optical head 12 in the radial direction above the optical disk l. The control circuit 15 also controls the access ++y.
, the optical head 12 corresponds to the target track 1-1. When the start sector and the count value of the sector counter 10 match 1. When the optical head 12 records,
This is to start the playback operation.

Further, the control circuit 15 modulates the recording data from the host computer with the modulation circuit 20 [- and the laser driver 2
1, this laser driver 21 records information by driving a semiconductor laser (not shown) in the optical head 12 in accordance with the supplied modulated signal.

Furthermore, the control circuit 15 detects a defective block by detecting a solid frame using the timer 22 and the timer 23, and stores the detection result of the defective block in the memory circuit I6 (second defect At the end of block detection,
This is to be recorded in the defective block management information recording area 1d. The control circuit 15 also causes a header counter 24 to count the number of detected header frames for each program.The timer 22 counts the number of detected header frames for each block. Made 1. The tie 723 defines the block header reading time for each program.

Next, the operation of such configuration buttons will be explained. first,
When the optical disc 1 is manufactured, the optical disc 1 is set in the optical disc apparatus of the present invention, and the block number in which the block header is to be recorded is supplied from the host computer (not shown) to the control mj circuit 15. Then, the control The circuit 15 uses the conversion table in the memory circuit 16 to calculate the track, start sector, and speed information of a target block.
put out In other words, the control circuit 15 determines the range of the track including the target block number in the conversion table and the speed information...111. 1 depending on the range data of that track
((Target block number is the first block number) x tens of sectors (starting sector) ÷ 256 + track number of the first block", and based on the calculation result, each track number and starting sector of the target block are calculated. and is served,
Thereby, the rhyme control 1 circuit 15 controls the speed control section I7 according to the speed information. Then, the speed control section 17 drives the motor 2 to rotate the optical disc 1 at a rotation speed corresponding to the track. In addition, according to the track number, the control circuit 15 directly converts the track number to a scale value 12, and then drives the linear motor driver until this scale value matches the position detected by the output of the position detector shown in the figure (7). By driving 18, the optical head 12 is moved.Then, the control circuit 1
5 indicates that the count value of the sector counter 10 and the start sector match 1. At this time, the laser driver 21 is driven and the above-mentioned 1. Preamble data and eight header frames are recorded as a preheader in L2.

Thereafter, the headers for other blocks will also be recorded on the optical disc 1 as described above. In this way, the header is recorded in exactly 300,000 blocks over the entire surface of the optical disc 1.

This optical disc 1 is issued 1+9 to the user.

In such a state, the recorded j and tab headers in each block can be reproduced without error, but Judgment 1. .

iE 1. , <g A block having a block header that cannot be generated is determined to be a defective block 17, and this determination result is stored in the defective block management information recording area 1d of the optical disc 1. In other words, first, the host computer (1. not shown) controls the control circuit. 15 to access the first block. Then, the control circuit 15 uses the conversion table in the memory circuit 16 to calculate the track of the first block and the 01/1 starting sector speed information.
5 is the velocity product fJ3. ) 11 and speed control section 17
control. Then, speed control? The II section 12 rotates the optical disc 1 at a rotational speed corresponding to the track by driving the motor 2.1. 8 Also, depending on the smell of the delivery truck, the control circuit 15 converts the truck No. 2 into a scale value 1-1 This scale value matches the one detected by the output of the position detector shown in the figure. By driving the linear motor driver 18 until K, the optical head 12 is moved to the sector (, 2).Then, the control unit i1'815 sets the count (i
When the start sector and the above start sector match, the ray→]4 driver 2 is driven 1. Then, the optical head 72) reproduces the data on the 10 disk 1. Then, it is detected whether the header frame in the pre-header in the block header of the first block on the optical disk 1 has been read. Tsumashi,
By comparing 8 bytes of opposite-phase header address data and positive-phase header address data, which are reproduced following the header frame synchronization code, one pit at a time, the exclusive OR is calculated. All calculation results are
1", it is determined that the header frame has been read correctly [7]. When even one of the calculation results is "0", it is determined that the header frame is incorrect. As a result, when detecting the header frame for the first block,
If the predetermined time has elapsed 1 but no detection is detected, the control circuit 15
determines that the optical disc 1 is defective j7, notifies the operator to that effect [7, and ends the process.

Further, when detecting the ~ladder frame for the first block frame ζ, when the head frame 1)-- is read correctly, the control circuit 15 activates the timer 22 and the timer 23. Next, the control circuit 15 counts up the header counter 23 (2), and when another header frame is read correctly (2) by the reproduction position of the optical disc 1, it counts up the lag counter 24 again. In this manner, when the timer 23 is tied up by 11, the control circuit 15 determines that the first block is a defective block if the count of the HELAG counter 24 is "4" or less, and stores the block number. 6 is stored in the circuit 16. Also, when the count content of the header counter 240 is "5" or more, the control circuit 1
5, the first block is city 1. It is determined that the block is invalid (1
, determine the access to the second block, thereby:
The control circuit 15 controls the speed control section 17 in accordance with the speed information for the second block to rotate the optical disk 1 at a rotation speed corresponding to 1tIn+-1.

Part 1. before timer 22 expires, or
2, when the header frame for the second block is detected, the control circuit 15 starts the timer 22 and the timer 2.
Activate 3 [set 7. Next, the control circuit 15 counts up the header counter 24, and then counts up the optical disc 1.
When another header frame is correctly read by the reproduced signal, the lag counter 24 is counted up again.

In this way, when the timer 23 ends 1°, the control circuit 1
If the count content of the header lag counter 24 is "4" or less, it is determined that the second block is a defective plotter 17, and its block number is stored in the memory circuit 16. Also, if the count content of the header counter 24 is "5" In the above case, the control circuit 15 determines 17 that the second block is the correct block, and determines whether to access the third block. As a result, the control circuit 15 causes the speed limiter 117 to rotate 111 in accordance with the speed information for the third block, and rotates the optical disk J at the corresponding rotational speed. Also, depending on the track number of the third block, the control circuit 15 converts the track number into a scale value, and continues linearly until this scale value and the position detected by the output of the position detector 7 (not shown) match. By driving the motor driver 18, the optical head 12 is moved. Then, the timer 22 returns to the end check of timer 1, and returns to the soda detection section of the second program. However, when the soda frame is not detected in step 5, the second program determines that the block is defective (17) and stores the program number (17) in the memory circuit 16.Then, the control circuit 15
determines the access to the third block, and controls the speed control section 17 according to the speed information for the third block to rotate the optical disk 1 at the corresponding rotational speed. Also,
Based on the track number of the third processor, the control circuit 15 converts the track number into a scale value! 1. The gutter 12 is moved towards the optical system by driving the linear motor dryer I/1B until this scale value matches the position detected by the output of a position detector (not shown). Then, the control circuit 15 activates the timer 22 1. After that, the process returns to the end check of timer 22.

Thereafter, the frame under frame is detected for each block as described above, and when the final program is completed, the control circuit 15 determines whether there is a defective program (5, Linear Motor Drino 418). 1), the optical system 2 is made to access the defective program recording area 1e. In b), the control circuit 15 reads out the defective program recording area 12 of the memory circuit 16 and uses this data. Accordingly, the address of the defective program and the number of consecutive defective programs are calculated. Further, the control circuit 15 drives the laser diode 21 in accordance with the calculated data to record the data. As a result, the defective block address and the number of consecutive defective blocks as shown in Table 1 above are recorded in the defective block management information i recording area 1d on the optical disk 1. The key points of the above operation are explained in the broach yard shown in FIGS. 7(a) and (bl).

Therefore, when the user sets the optical disc 1 to the image information recording and retrieval device (not shown), the control program software disc (not shown) shows the defective program of the optical disc 1. Tsuku management information 9 Store defective block data of self-bell area 1d1. I'll leave it there. For this, optical disc 1
When recording data to , data can be recorded in areas other than the defective block using the defective block data as a reference.

Data can be prevented from being recorded in defective blocks.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a disk device that prevents data from being recorded in blocks on the disk that have a high probability of error, and that can improve the reliability of recorded data.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic configuration diagram, FIGS. 2, 2F, and 3 are plan views showing the configuration of an optical disk, and FIG. 4 is a diagram showing an example of a block format. FIG. 5 is a diagram for explaining the relationship between the disk and the detector, FIG. 6 is a diagram showing an example of storage of conversion data, and FIG. 7 is a flowchart for explaining the main part of the operation. DESCRIPTION OF SYMBOLS 1... Optical disk (disc), 1d... Defective block management information recording area, 2... Motor, 12...
Optical head, 15...Control circuit, 16...Storage circuit, 17...Speed control section 519...Linear motor mechanism, 21...Laser driver, 22.23...Timer, 24... - Header counter. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 (a) Figure 4 (b) ] Figure 5 Figure 6 Commissioner of the Patent Office Kazuo Wakasugi Dear 1. Indication of the case Patent application Sho F) 8-177396 No. 3, Relationship with the Nagisa case to be amended Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4, engraving of the agent's specification (no change in content)゛-

Claims (1)

[Claims] fi+ For a disk in which a spiral or concentric track is divided into blocks and block address data is recorded in advance at the beginning of each block,
In a device that reproduces or records data, there is a detection means for detecting defects in each data block, and defective block address data indicating a defective block is recorded in a predetermined recording area on the disk according to the detection result of the detection means. What is claimed is: 1. A disk device comprising a recording means for recording. (2) The disk device according to claim 1, wherein the detection means detects defects based on block address data indicating data blocks. (3) The disk device according to claim 2, wherein the block address data is composed of at least normal-phase and reverse-phase data.