JPS61210564A - Recording medium - Google Patents

Abstract

PURPOSE:To attain pre-format of block data simply without reducing the record ing capacity by making the number of blocks identical to each plural tracks and forming the block data on the same position. CONSTITUTION:In providing a block header A in common to each track at plural track groups (a-k), the block number of each track is made identical and the block data is formed at the same position and crosstalk between tracks is prevented. Further, one track at the groups (a-k) is made blank to prevent the crosstalk between track groups. Through the constitution above, the block data is subjected to pre-format simply without reducing the recording capacity as soon as a recording medium is made.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is used, for example, in an optical disk device,
It relates to recording media such as optical discs for recording or reproducing data.

[Technical background of the invention I! ] 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 recorded on an image recording device, or it can be searched and reproduced as needed. Recently, optical disk devices have been used as image recording devices in image information file devices that can reproduce and output as hard copies or soft copies.

Conventionally, such optical disk devices use an optical disk (recording medium) that records data in a spiral manner, and an optical head that moves directly in the radial direction of this optical disk using a linear motor records or reproduces data. It is about to be done.

In the above-mentioned optical disk, the spiral or concentric tracks are divided into blocks each containing fixed length data.
Block address data is recorded in advance at the beginning of each block.

[Problems with the background art] However, with the above-mentioned devices, when attempting to pre-record block (address) data on the master disc during the manufacture of optical discs (pre-formatting), it is necessary to make the track grooves larger or smaller. It has become. Therefore, when the reproduction signals of the block data and the recorded data are compared, there is a signal ratio of 1:10, and the signal is smaller than the crosstalk caused by the influence of the recorded bits of the adjacent track. Therefore, there is a problem that the preformatted block data cannot be reproduced accurately.

Therefore, it is not possible to preformat the block data when manufacturing the master disc, and the block data has been preformatted by setting it in the optical disc device after manufacturing and recording the recording data. As a result, manufacturing one optical disc requires wasted time and costs are high.

Furthermore, as a method for preformatting block data on a master disc, there is a method in which block data is preformatted in the same sector for each track. However, this method has the disadvantage that although the influence of crosstalk is small, the storage capacity is drastically reduced.

[Object of the Invention] This invention was made in view of the above circumstances, and its purpose is to enable preformatting of block data on a master disc without reducing the recording capacity, and to reduce the price. The goal is to provide a recording medium that can

[Summary of the Invention] In order to achieve the above object, the present invention divides concentric or spiral tracks into blocks and records data based on the block data formed at the beginning of each block. The number of blocks is the same for each of the plurality of tracks, and the block data for each track group is formed at the same location.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The drawings schematically show a recording medium, such as an optical disk, of the present invention. That is, 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, and a notch is provided near the center of the metal coating layer. That is, a reference position mark 11 is provided. Further, the optical disk 1 is divided into 256 sectors of 0 to 255, with the reference position mark 11 being ``o''.

On the optical disk 1, variable length information (image information) is stored over a plurality of blocks,
Information of 248,725 blocks is stored on 22,475 tracks on the optical disk 1. The number of sectors in one block on the optical disk 1 is, for example, 43 sectors on the innermost circumference side and 16 sectors on the outermost circumference side. Furthermore, if each block does not end at the sector switching position, a block gap is provided at the last sector so that each block always starts from the sector switching position. A block header (block address data) A consisting of a block number, track number, etc. is formed at the start position of the block at the same time as the master is manufactured. The block header A is formed by making the track groove larger or smaller.

Further, as shown in the drawing, the optical disc 1 has an actual data recording area 1a located at a distance of ro (25,00 mm) from the center.
) to rm (61,00 mm) with a width of 36, QQ mm. In this data recording area 1a, there are 11 track groups a1b, , c, d, e, from the inside.
f, g, h, i, j.

k is provided. As shown in the drawing, each track group a... has the same number of blocks, and the block header A in each track group a... is provided at the same position. That is, in each track group a..., block headers are formed at the same position on adjacent tracks, and no data is recorded, so crosstalk due to the influence of data can be prevented from occurring. Furthermore, the block header A is always recorded in the reference sector (O sector) in each track group A.

For example, as shown in Table 1, in track group a,
The number of blocks is 6, the number of tracks is 625, the diameter is 25,
It is located at a position of OO~26.044 mm. In the track group, the number of blocks is 7 and the number of tracks is 232.
5, and is located at a position with a diameter of 26.044 to 29.76 mm. In addition, the number of blocks in track groups C to j increases by one, and the number of tracks is 2,325. In the track group k, the number of blocks is 16 and the number of tracks is 925, and they are located at a position with a diameter of 59.52 mm and 61.00 mm.

Incidentally, a non-recording area is provided at the boundary between each track group and the track group, in which no data is recorded for each track. This makes it possible to prevent data crosstalk from occurring at the boundaries of track groups.

2048 bytes of data are recorded in one block, and the diameter of the recorded bits is 1.2 μm.

The width of the track is 1.6 μm.

Table 1 As mentioned above, concentric or spiral tracks are divided into blocks during master production, and based on the block data formed at the beginning of each block,
In devices that record data, each block header is recorded at the same position with the same number of programs for each track group, so when manufacturing the master optical disk, the block header is formed at the same time as the track groove is formed. can be formed. In this case, in each track group, block headers are formed at the same position on adjacent tracks, and no data is recorded, so crosstalk due to the influence of data can be prevented from occurring. Therefore, a block header that is not affected by crosstalk can be formed without reducing the capacity, and master formatting can be performed. This invention and conventional C
Comparing the capacities of the AV system and the CLV system on disks of the same size, the capacity of the present invention is 509MB (megabytes), and the capacity of the CAV system is 320MB.

The capacity of the CLV method is 525MB, which is almost the same as that of the CLV method.

By being able to format the master disc in this manner, it is possible to shorten the manufacturing time of the optical disc and reduce costs.

The optical disc 1 manufactured as described above can be processed by a CLV type optical disc device which records or reproduces data at a clock speed corresponding to the track position (145 steps, every 155 tracks). In this case, since the speed change at the boundary between each track group is within 1%, reliable reproduction is possible.

[Effects of the Invention] As described in detail above, according to this invention, it is possible to provide a recording medium that can preformat block data on a master disc without reducing its recording capacity, and that can reduce the price.

[Brief explanation of the drawing]

The drawing is a diagram for explaining the configuration of an optical disc in an embodiment of the present invention. 1... Optical disc (recording medium), 1! ...Reference position mark, 1a...Data recording area, a to k...Track group, A...Block header (block data). Applicant's representative Patent attorney Takehiko Suzue... Commissioner of the Patent Office Michibe Uga 1. Indication of the case Patent Application No. 1988-29705 2. Recording medium for the name of the invention 3. Patents related to the amended person's case Applicant (307) Toshiba Corporation 4, Agent 5, Voluntary Amendment 7, page 8, line 12 to line 13 of the statement of contents of the amendment: ``The diameter of the recording pit is 1.2 μm, the width of the track ``But'', it says ``
The recording bit pitch is 1.2 μm, and the track pitch is
I am corrected.

Claims (4)

[Claims] (1) In a device that divides concentric or spiral tracks into blocks and records data based on the block data formed at the beginning of each block, the number of blocks is the same for each of the plurality of tracks. A recording medium characterized in that block data for each track group is formed at the same location. (2) The recording medium according to claim 1, wherein the block data is composed of address data such as a track number and a block number. (3) The recording medium according to claim 1, wherein a non-recording track in which at least one track's worth of data is not recorded is provided between the track groups having different numbers of blocks. (4) The recording medium according to claim 1, wherein the block data for each track group having a different number of blocks is formed at least one location at the same reference position.