DE3604916A1 - Recording carrier - Google Patents

Abstract

An optical disc has spirally or coaxially (concentrically) arranged tracks, which are subdivided into a number of track groups. Each track group contains a predetermined number of tracks, in each case provided with a block head. The block heads of the respective tracks are aligned with one another in the radial direction of the optical disc.

Description

Recording media

The invention relates to a recording medium, in particular for Used in a constant linear velocity recording disk device working type.

Currently, a document filing arrangement is widely used which is designed for recording and playback of document information. At this Filing or also filing arrangement is optically from one image information Receipt or document read out and the optically read image information on recorded on a recording medium. The recorded information can are retrieved from the recording medium in order to be reproduced on a display device or to be printed out by means of a printer.

Said receipt storage arrangement is provided with a disk device, in which by optical means the receipt information on an optical disk recorded and read out the recorded receipt information from the disk be (can). The disk device can be classified into two types, namely a those of the constant linear velocity or CLV type and those of the constant angular velocity or CAV type. In the former type, the number of revolutions of the optical disk increases continuously while the optical (record / read) head moves from the inside to the outside of the optical disk shifts so that the track of the optical disk is always with passes the optical head at a predetermined speed. The disk device of the CAV type, on the other hand, is characterized in that the rotational speed of the optical disk always remains the same.

With the CLV-type disk device, receipt information can be stored on the entire Uniform size track or Density (rate) are recorded, because the relative speed between the (recording) track of the optical Disk and the optical head always remains the same. The CLV device thus offers the Advantage that information with a high density of e.g.

Record 525 Mbytes on an optical disk. The previous one However, the CLV device has the following defects.

A master disc is made in a manufacturing plant, before finally making an optical disk. In this case are on spiral or coaxial tracks are formed on the mother disk. The tracks are there divided into blocks (each) of a predetermined track length. At the head block address data are impressed on each block. A final optical disk becomes made on the basis of the mother plate by embossing or pressing and forming processes.

In the previous optical disk with the structure described are the positions of the block data as viewed in the radial direction of the optical disk from Track to track offset from one another. Therefore, if on the previous optical disk Data is or is being recorded, the recording data may not be accurate are reproduced because due to the influence of the block address data bits of neighboring Crosstalk occurs in the traces.

The object of the invention is thus to create a for use in a disk device of the constant linear velocity type or CLV-type suitable recording medium, which is only slightly affected by crosstalk can be influenced.

This task is characterized by that in claim 1 Features solved.

The invention relates to a recording medium that thereby characterized in that a plurality of spiral or coaxial tracks in the radial direction of an optical disk are grouped and the respective track groups (each) one Having a plurality of tracks each having the same number of blocks. The leading one The block of the relevant track groups is provided with a block header. The block heads of the track groups are arranged linearly in the radial direction of the optical disk.

The following is a preferred embodiment of the invention the drawing explained in more detail. They show: FIG. 1 a cross section through an optical one Disk in a recording medium according to the invention, FIG. 2 is an illustration of the format of the optical disk according to FIG. 1, FIG. 3 is an enlarged scale Partial representation of the optical disk according to FIG. 1 and FIG. 4 is a block diagram an apparatus for manufacturing the optical disk according to the invention.

The production of the optical disk according to FIG. 1 takes place in the manner that circular, transparent substrates or supports 12, 13 by means of a glass material or plastic and with the interposition of inner and outer spacers 14 or 15 can be set one above the other. Made from tellurium or bismuth standing Metal films or layers 16, 17 are thermally formed in a circular ring deposited on the inner surfaces of the transparent substrates 12,13.

According to Fig. 2, notches or recesses 18, 19 in the vicinity of the Central region of the metal layers 16, 17 is formed. These recesses 18, 19 serve as reference position marks. Starting from the reference position marks 18, 19 the disk 11 is divided into 256 sectors from 0 to 255.

Furthermore, in the optical disk 11, they are spiral or concentric Form 22 475 tracks are formed, which are further divided into 248 725 blocks. In this way, the inner to the outer circumference of the plate 11 becomes different Numbers of sectors formed so that the respective blocks (each) have a predetermined Have record length. The tracks are divided into blocks in such a way that that one block at the innermost periphery of an effective recording area is 43 sectors and one block at the outermost periphery of the effective recording area is 16 sectors having. If the blocks in question at the sector boundary are not completely separated from each other can be severed, a block gap is created in the last sector of the block provided so that the relevant blocks necessarily start from the sector boundary can.

According to FIGS. 2 and 3 is in each block start or start position a block header A (for specifying a block address data unit) is provided. This block head A contains address data such as block number and track number.

In the optical disk 11 shown in FIG. 2, there is an actual one or actual recording area 20 from an area between a point ro (25.00 mm from the center of the plate 11) and a point rm (61.00 mm from the center). This data recording area 20 is from the inside as seen, divided into eleven track groups a to k. As shown in Fig. 3, take the block heads A of the respective tracks (each) the same position, in the radial direction of the optical Plate seen a. According to FIG. 2, a block header A is in each case on the reference sector (O-th sector) of the track groups a to k present. By the arrangement of the block heads A becomes an influence or deterioration of the block data by between neighboring ones Prevents traces of crosstalk.

As can be seen from the following table, the track groups take a is a recording surface, which in the radial direction at a distance of 25.00 - 26.044 mm from the center of the optical disk 11 and the 6 blocks and 625 tracks includes. The group b occupies a recording surface at a radial distance is 26.044-29.76 mm from the center and comprises 7 blocks and 2325 tracks. Similarly, track groups c to j contain 8 to 15 blocks and, respectively the same number of tracks in each case (2325). The track group k contains 16 blocks and 925 tracks. The track group k occupies a recording area at a radial pitch of 59.52 - 61.00 mm from the center of the optical disk 11. A group of the 2325 tracks is divided into 15 track subsets to avoid the occurrence of a sudden change the recording density at the boundary between adjacent track groups Data is recorded in each track at the same rate for all Traces of the subgroup.

In all of the track groups a to k, there is a record-free area M a width corresponding to one track in the border area between adjacent track groups intended. Due to the presence of the record-free Area M is the occurrence of crosstalk in the boundaries between the respective track groups suppressed.

One track allows data of 2048 bytes to be recorded. A recorded Bit has a diameter of 1.2 µm, while a track has a width of 1.6 ijm owns.

Tabel Track block number | Track number diameter (mm) group a 6 | 625 25.00-26.044 b 7 2325 26.044 - 29.76 c 8 2325 29.76 - 33.48 d 9 2325 33.48 - 37.20 e 10 1 2325 37.20 - 40.92 f 11 2325 40.92 - 44.64 g 12 2325 44.64-48.36 h 13 2325 48.36 - 52.08 i 14 2325 52.08-55.80 j 15 2325 55.80 - 59.52 k 16 925 59.52 - 61.00 The manufacture of an optical disk 1 of the format described above is preceded by the manufacture of an original disk of the (same) format. An apparatus for producing the original plate is described below with reference to FIG. First, a glass plate 31, the surface of which is coated with a photoresist, is provided. The glass plate 31 is connected to the shaft of a motor 32. A laser head 33 opposed to the photoresist layer of the glass plate 31 comprises a laser 34 and a laser modulator 35 for modulating the laser beams in accordance with the contents of the input data. The laser head 33 can be displaced radially to the glass plate 31 by a drive motor 36.

The laser modulator 35 is connected to the output terminal of a 2-7 code modulation circuit 37 of a control part connected. The modulation circuit 37 is connected to a central unit (CPU) 38 and a programmable frequency generator (or synthesizer) 39 connected.

The latter consists of a frequency divider and takes clock data from the central unit 38 and clock pulses from a reference clock circuit 40. An output signal from the reference clock circuit 40 is fed to a sector counter 41 which is controlled by a pulse is reset, which is output per revolution of the motor 32, which is in synchronism with an original pulse supplied by an encoder 42 connected to the motor 32 (origin pulse), i.e. a reference clock pulse, is driven or controlled, wherein the reference clock pulses are counted.

When in the device according to FIG. 4, the drive motor 36 with that designated or predetermined by a division (distance) designation unit 43 Drive pitch starts to rotate, the laser head will move in Correspondence with the designated track pitch shifted radially. In the meantime The central unit 38 ends an initialization step and it is ready to start made. If the Central unit 38 is set ready to start (is set starting), the formation of the block head begins. The central unit 38 leads writing a block header in accordance with the table above Data content through. When the displacement of the laser head 33 is under surveillance has, is or will be swept over by the central unit 38, 25 mm of the diameter the initial (first) block header is written in the reference sector (O sector). At the time of writing, the central processing unit 38 supplies pre-format data, i. Block address data, to the 2-7 code modulation circuit 37 and also clock data to the programmable Normal frequency generator 39. The latter sets a modulation clock signal from the by the central unit 38 supplied clock data and one supplied by the reference clock circuit 40 Clock pulse signal together. The modulation clock signal becomes the 2-7 code modulation circuit 37 supplied.

The 2-7 code modulation circuit 37 modulates one of the programmable Normal frequency generator 39 output modulation clock signal in accordance with the content of the pre-format data received from the central unit 38, and he supplies a block address data signal to the laser modulator 35 in accordance with the from Central unit 38 delivered clock or timing pulse.

The laser modulator 35 modulates the laser radiation from the laser 34 in Match the content of a block address data signal. When modulated laser beams are focused on the glass plate 31, the photoresist layer applied to the latter becomes exposed in accordance with the content of the block address data.

If the central processing unit 38 while it is counting or the count of the sector counter 41 monitors the number of sectors constituting a given block is detected, the following block address data is stored in a Photoresist layer recorded. If in the photoresist layer, block heads for dividing a track are recorded in six parts, the sector counter 41 is set by the original pulse reset. At this point in time, the drive motor 36 switches by one track pitch further so that the laser head 33 is shifted to a second track. Then will the same operation as described above is repeated by six block heads in the second track. Here the block heads are in the second track formed so that they are radially aligned with the block heads of the first track.

When the block heads are on a layer of photoresist over 625 tracks are formed, the blocking of the track group a is brought to the end.

Then block headers corresponding to the 2325 tracks of the block group b is formed on a photoresist layer. If a signal is detected that the sector number 7 indicates into which a track is to be divided is supplied by the central unit (CPU) 38 a block header write-in signal, i.e., a timing pulse. If that Writing of a block header in track group b is finished, generation starts a block head in track group c. When block heads on photoresist layers for all track groups a to k are generated becomes or is a photoresist mother board (board), from which a die is produced, which in turn is an original board for making an optical disk according to FIG.

In the original disc, numerous tracks are concentric or spiral educated. Each of these tracks is divided into several blocks. The track groups are formed from (each) the same number of blocks. Take the block heads in Direction of the radius of the plate seen, (each) the same position a. As a result, the block heads will be impaired in all track groups by crosstalk due to data recorded in the adjacent tracks prevented.

An optical disk according to the invention has a recording capacity of 509 megabytes and allows recording and playback by means of a disk device of the CLV type, in which the rotating speed of the optical disk increases in 145 steps for each 155 tracks can be changed using the clock frequency according to the track position can. In this case, the disk speed varies in the border area of track groups in a range of 1%, which allows recording and playback without impairment is guaranteed by possible changes in the disk speed.

Claims (5)

Claims 1. A recording medium having one on a substrate (or carrier) intended recording area with a plurality of coaxial (concentric) or spiral tracks, characterized in that the tracks are divided into a number of Track groups (a to k) each having a predetermined number of tracks are divided and each of the tracks included in each of the track groups into a predetermined one Number of blocks different from that (number) of another track group is, and the blocks each have a block head (A) which, in the radial direction seen, occupies the same position as that in other blocks in the same track group intended block head. 2. Recording medium according to claim 1, characterized in that the block header (A) is formed from address data including a track number and a block number indicate. 3. Recording medium according to claim 1, characterized in that at least one record-free track is formed between adjacent tracks is. 4. Recording medium according to claim 1, characterized in that the respective track groups (a to k) have address headers which, in the radial direction seen of the recording medium, take (each) the same position. 5. Recording medium according to claim 1, characterized in that the substrate (12 or 13) from a made of transparent material and the recording area (16 or 17) is formed by a metal layer is.