JP3112535B2 - Optical disc master exposure system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk master exposing apparatus, and more particularly, to a signal generating unit of an optical disk master exposing apparatus suitable for producing a read-only optical disk which is driven to rotate at a constant angular velocity mode. Regarding the configuration.

[0002]

2. Description of the Related Art As is well known, an optical disk is duplicated from an optical disk master on which a desired preformat pattern has been cut.
This is performed by an optical disk master exposure apparatus.

Conventionally, optical disks of the constant angular velocity type provided on the market are of a write-once type or a rewritable type, and a plurality of recording tracks are arranged at equal angular intervals in a circumferential direction of a recording track based on a specific position on the optical disk. Divided into sectors,
Recording and reproduction of information can be performed for each sector. Each sector is divided into a header section, a data section, and a buffer section from the head side. In the header section, a sector mark indicating the delimitation of each sector, an address of each sector, and recording and reproduction of information for each sector. Clock pits for drawing in a reference clock necessary for performing the above operation are recorded in the form of pre-pits in advance, and data is not recorded in the data part and the buffer part in the form of the pre-pits.

[0004] An optical disk master exposure apparatus for cutting an optical disk master, which is the basis of such an optical disk of the constant angular velocity system, includes a spindle motor for rotating the optical disk master in a constant angular velocity mode, a laser light source, and a laser light source. An optical modulator that modulates a laser beam with a signal, a signal generator that supplies a recording signal to the optical modulator, and an objective lens that focuses the laser beam signal-modulated on the master optical disc are provided. The signal generator includes a counter circuit that outputs a sector start signal at a timing corresponding to a start position of each sector with reference to a specific position of the master optical disc, and each time the sector start signal is output from the counter circuit, An address signal generating circuit for generating and outputting an address signal peculiar to the memory, and a read-only semiconductor memory (RO) storing a certain signal corresponding to the sector mark, clock pit, or the like.
M), a signal synthesizing circuit for synthesizing the address signal and the ROM signal (sector mark and clock pit), and a central processing unit for controlling the entire device. Each time the sector start signal is output from the counter circuit, an address signal is output from the address signal generation circuit, and a ROM signal is read from the ROM and synthesized by a signal synthesizing circuit. By applying the voltage to the modulator, data can be recorded on the master optical disc. In this type of optical disc master exposure apparatus, it is sufficient that the signal generation unit includes a small-capacity semiconductor memory capable of storing signals corresponding to sector marks, clock pits, and the like.

Recently, there has been proposed a read-only type optical disk of a constant angular velocity type, in which a data signal is previously recorded in the data portion in the form of a pre-pit. In order to cut this kind of optical disk, it is necessary to provide a signal generation section of the optical disk master exposure apparatus with a memory in which a data signal to be recorded in the data section is stored. Examples of such a memory include a static information storage medium such as a semiconductor memory, and a dynamic information storage medium such as an optical disk, a magnetic disk, and a magnetic tape. Actually, a signal generating section of an optical disc master exposure apparatus that cuts a read-only optical disc (for example, a compact disc) of a constant linear velocity system has a disk-shaped recording medium or tape-shaped recording medium as a large-capacity memory in which data signals are stored. Medium is used.

[0006]

A dynamic recording medium such as a disk-shaped recording medium or a tape-shaped recording medium reads data signals by driving the medium relative to a head, and is therefore arranged in the track direction. It is easy to read the data signal continuously, but it is extremely difficult to intermittently read the data signal for one sector in accordance with the head position of each sector to be cut on the master optical disc. Therefore, even if only a dynamic recording medium is provided as a data source in the signal generation unit of the optical disc master exposure apparatus,
It is not possible to efficiently cut a read-only optical disk of a constant angular velocity system. In the read-only optical disk of the constant linear velocity system, the track is not divided into sectors, and an operation of intermittently supplying a data signal of one sector in accordance with the head position of each sector is unnecessary. The optical disc master can be efficiently cut using the dynamic recording medium as a data source. In this respect, an apparatus for cutting a read-only optical disk of a constant angular velocity method is fundamentally different from an apparatus for cutting a read-only optical disk of a constant linear velocity method.

On the other hand, a static information storage medium such as a semiconductor memory has excellent random access characteristics, and can read out data signals for one sector intermittently and supply them to an optical modulator. When used as a source, cutting of a read-only optical disk of a constant angular velocity system can be facilitated. However, semiconductor memories are expensive,
If a data source with a huge storage capacity comparable to an optical disk is constructed using only semiconductor memory, the device becomes extremely expensive, and the capacity of a recordable read-only optical disk is limited by the capacity of the semiconductor memory. There is. In order to store a data signal to be cut on an optical disk master in a semiconductor memory device as a data source, first, a master medium (for example, an optical disk or the like) on which a desired data signal is stored is manufactured, and then the data signal is stored. In such a case, there is a problem that it takes a long time to prepare before cutting.

SUMMARY OF THE INVENTION The present invention has been made in order to improve the deficiencies of the prior art, and an object of the present invention is to provide an optical disc master disc exposure apparatus capable of cutting a read-only optical disc of a constant angular velocity system at high efficiency at a low cost. To provide.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a spindle motor for rotating a master optical disc in a constant angular velocity mode, a laser light source, and a signal modulation on a laser beam emitted from the laser light source. An optical disc master exposure apparatus comprising: an optical modulator for applying a laser beam; a signal generator for supplying a recording signal to the optical modulator; and an objective lens for focusing a laser beam signal-modulated on the optical disc master. A drive device for mounting a master medium on which all data signals to be recorded on the optical disc master are recorded and reading out data signals recorded on the master medium, and a semiconductor memory connected to an output end of the drive device And a controller for controlling the input and output of data signals to and from the buffer memory group. A counter circuit for outputting a sector start signal at a timing corresponding to a start position of each sector with reference to a specific position of the master optical disc, and a counter specific to each sector every time the sector start signal is output from the counter circuit. A header signal generation circuit that generates and outputs a header signal; a signal synthesis circuit that synthesizes the data signal and the header signal; and a central processing unit that controls the entire device. Each time a signal is output, a header signal is output from the header signal generation circuit, and one sector of the buffer memory in the buffer memory group is sent to the signal synthesis circuit from one of the buffer memories based on a command from the central processing unit. To record data on the master optical disc, and during the data recording. And to perform the transfer of data signals between the transfer and the buffer memory of the next data signal to the buffer memory group from the master medium.

[0010]

As described above, even when a dynamic information storage medium such as an optical disk is used as a data source (master medium) and a data signal read from the dynamic information storage medium is directly transferred to a signal synthesizing circuit, Since a data signal cannot be transferred one sector at a time to the master optical disc, a read-only optical disc of a constant angular velocity method cannot be cut. Therefore, a buffer memory group including a plurality of buffer memories is provided between the master medium and the signal synthesizing circuit, and data transfer from the master medium to the buffer memory group, data transfer between the buffer memories, and signal transfer from the buffer memory are performed. When the timing of data transfer to the combining circuit is controlled by the CPU, a data signal can be transferred to the master optical disc one sector at a time, so that a read-only optical disc of a constant angular velocity system can be cut.

Since the buffer memory only needs to have a storage capacity of several sectors, the signal generator is much cheaper than a semiconductor memory device capable of storing all data signals to be recorded on the master optical disc. Can be configured. Further, since the cutting of the master optical disc can be performed while reading the data signal from the master medium, the cutting is required as compared with a case where the cutting is started after the data signal recorded on the master medium is once stored in the semiconductor memory device. You can save time.

[0012]

【Example】

<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of a signal generator according to the first embodiment, FIG. 2 is an explanatory diagram of an optical disk master exposure apparatus,
FIG. 3 is a timing chart showing the operation of the signal generator according to the first embodiment.

As shown in FIG. 2, the optical disk master exposure apparatus of this embodiment includes a spindle motor 2 for driving the optical disk master 1 to rotate at a constant angular velocity mode, a laser light source 3, and a laser beam 4a emitted from the laser light source 3. , A signal generator 6 for supplying a recording signal s to the optical modulator 5, and an objective lens 7 for focusing a laser beam 4 b modulated on the optical disk master 1. It is configured. The components of the apparatus other than the signal generating unit 6 are the same as those of the conventionally known optical disk master exposure apparatus, and are not the gist of the present invention, so that the description will be omitted.

As shown in FIG. 1, a master medium 11 on which all data signals to be recorded on the optical disk master 1 are detachably mounted on the signal generating section 6 and recorded on the master medium 11. A drive device 12 for reading out a data signal a, an upper buffer memory 14 connected to an output terminal of the drive device 12 via a drive interface 13, and two lower buffers connected in parallel to an output terminal of the upper buffer memory 14. Buffer memories 15 and 16 are provided. Upper buffer memory 14
Comprises a semiconductor memory having a storage capacity of at least a plurality of sectors, and includes lower buffer memories 15 and 16.
Is composed of a semiconductor memory having a storage capacity of at least one sector.

A buffer memory 14 is provided between the drive interface 13 and buffer memories 14 to 16.
, A data controller 17 for controlling writing and reading of data signal a to and from buffer memory 1
Storage position (address) of data signal a for 4 to 16
An address controller 18 for designating the drive interface 13, the data controller 17, and the address controller 18 are controlled by a central processing unit (CPU) 19.

The signal generator 6 further includes a counter circuit 20 that counts sector lengths based on a specific position of the master optical disc 1 and outputs a sector start signal b at a timing corresponding to the start position of each sector. A header signal generating circuit 21 for generating and outputting a header signal c unique to each sector each time the sector start signal b is output from the counter circuit 20, and a signal for synthesizing the data signal a and the header signal c There is provided a synthesizing circuit 22 and a modulation circuit 23 which modulates the synthesized signal d output from the signal synthesizing circuit 22 in a desired manner and supplies a recording signal s to the optical modulator 5. The counter circuit 20 is provided on the rotating shaft of the spindle motor 2 and generates a one-pulse signal each time the optical disc master 1 makes one rotation.
For example, it can be connected to a rotational position detecting device (not shown) such as a rotary encoder and activated by a signal from the device. The header signal generation circuit 21 is the same as the signal generation section described in the section of the related art, and includes an address signal generation circuit for generating and outputting an address signal unique to each sector; Read-only semiconductor memory (ROM) that stores a certain signal corresponding to a clock and a clock pit, etc., and an address signal output from an address signal generation circuit and a ROM signal (sector mark and clock pit) output from the ROM. And a signal synthesizing circuit for synthesizing and outputting the result (not shown).

The operation of the optical disk master exposure apparatus according to this embodiment will be described below with reference to FIG. First, before cutting the optical disc master 1, a master medium 11 on which data signals to be recorded on the optical disc master 1 are recorded is manufactured. When an optical disk or a magnetic disk of a constant angular velocity system is used as the master medium 11, one sector of the optical disk master 1 is provided for each sector of the master medium 11.
A recordable amount of data signal is recorded in the sector. At this time, it is preferable that an error correction code is also recorded in the data portion of the master medium 11 in order to facilitate processing at the time of cutting. When the master medium 11 is mounted on the drive device 12 and driven under the control of the CPU 19, the data signal a read from the master medium 11 is transmitted to the data controller 1 controlled by the CPU 19.
7 and are sequentially stored in the buffer memories 14 to 16 under the control of the address controller 18.

As shown in FIG. 3, a one-pulse sector start signal b is output from the counter circuit 20 at intervals corresponding to the sector length. When the sector start signal b is output from the counter circuit 20, the header signal c to be recorded in the first sector of the first track is output from the header signal generation circuit 21, and the header signal c is output from the first lower buffer memory 15. A data signal a to be recorded in the first sector of the first track is output. The header signal c and the data signal a are combined by the signal combining circuit 22 and output from the signal combining circuit 22 as a combined signal d. The composite signal d is modulated by the modulation circuit 23,
Is output as a desired recording signal s. Optical modulator 5
Modulates the intensity of the laser beam 4a emitted from the laser light source 3 according to the recording signal s, and turns the laser beam 4a having a constant intensity into a pulsed laser beam 4b corresponding to the recording signal s. The objective lens 7 is positioned at a first track forming portion of the optical disc master 1 which is rotated and driven under the control of the CPU 19, focuses the intensity-modulated laser beam 4b on this portion, and records data for the first sector. Make a record.

When the next sector start signal b is output from the counter circuit 20, a header signal c corresponding to the second sector of the first track is output from the header signal generation circuit 21, and the second lower buffer is output. The memory 16 outputs a data signal a to be recorded in the second sector of the first track. Thereafter, data recording for the second sector is performed in the same manner. After the data signal a is output from the first lower buffer memory 15, at least the next sector start signal b
Is output from the upper buffer memory 14 to the first lower buffer memory 15 before is output from the counter circuit 20.
The data signal a to be recorded is transferred to the third sector of the track. At the same time, if necessary, the data signal read from the master medium 11 is written to the upper buffer memory 14. The data transfer from the master medium 11 to the upper buffer memory 14 can be performed for each data signal of one sector, or can be performed for each data signal of an arbitrary plurality of sectors.

When the flow of data is followed by focusing on the data of a certain sector, the data is first recorded from the master medium 11 to the upper buffer memory 14 (FIG. 3) and then transferred to the lower buffer memory 15 which does not output a signal. (FIG. 3), and finally combined with the header signal c to become a signal for master recording (FIG. 3).

Hereinafter, data transfer from the first lower buffer memory 15 to the signal synthesizing circuit 22 and data transfer from the second lower buffer memory 16 to the signal synthesizing circuit 22 are alternately repeated, so that each track is A header signal c, a data signal a, and an error correction code are recorded in each sector.

In this embodiment, a dedicated circuit is used for generating a header signal. However, the header signal c may be recorded on the master medium 11 and recorded in the same manner as the data section.

The optical disk master exposure apparatus of the above embodiment is
The signal generator 6 includes a drive device 12 for reading a data signal from a master medium 11 as a data source. An output terminal of the drive device 12 is connected to an upper buffer memory 14 having a storage capacity for a plurality of sectors. Two lower buffer memories 15 and 16 having a storage capacity of one sector are connected to the output terminal of the memory 14, and the signal combining circuit 2 is connected to the first lower buffer memory 15.
2 and the data transfer from the second lower buffer memory 16 to the signal synthesizing circuit 22 are alternately repeated, so that a large-capacity semiconductor capable of storing all data signals to be recorded on the optical disc master 1. Data recording for each sector can be realized without using a memory device, and cutting of a read-only type optical disc master of a constant angular velocity system can be performed. Therefore, the storage capacity of the semiconductor memory device to be provided in the signal generator 6 can be reduced, and the signal generator 6 and, consequently, the optical disk master exposure apparatus can be configured at low cost. In addition, since the cutting of the optical disc master 1 can be performed while the data signal a is read from the master medium 11, the data signal a recorded on the master medium 11 does not need to be temporarily stored in the semiconductor memory device. Can be shortened.

<Second Embodiment> A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a block diagram of the signal generator according to the second embodiment, and FIG. 5 is a timing chart showing the operation of the signal generator according to the second embodiment. The optical disc master exposure apparatus of the present embodiment is characterized in that the internal configuration of the signal generator 6 is changed as shown in FIG.
The overall configuration is the same as that of the first embodiment (see FIG. 2).

As shown in FIG. 4, two buffer memories 31 and 32 are connected in parallel to the output terminal of the drive device 12 in the signal generator 6 according to the present embodiment. Each of these two buffer memories 31 and 32 is composed of a semiconductor memory having a storage capacity of a plurality of sectors. The other parts are the same as those of the signal generating unit of the first embodiment, and therefore, in order to avoid duplication, corresponding parts are denoted by the same reference numerals and description thereof is omitted.

The operation of the optical disk master exposure apparatus according to this embodiment will be described below with reference to FIG. A master medium 11 on which all data signals to be recorded on the optical disc master 1 are recorded is mounted on a drive device 12, and the data signals a read by the drive device 12 are stored in two buffer memories 3.
When the sector start signal b is output from the counter circuit 20 in a state where the optical disk master 1 is rotationally driven, the header signal generation circuit 2
1 outputs a header signal c to be recorded in the first sector of the first track, and the first buffer memory 31 outputs a data signal a to be recorded in the first sector of the first track. These header signal c and data signal a
Are synthesized by the signal synthesis circuit 22 and the signal synthesis circuit 22
Is output as a composite signal d. The composite signal d is modulated by the modulation circuit 23, and is output from the modulation circuit 23 as a desired recording signal s. The optical modulator 5 outputs the recording signal s
The laser beam 4a emitted from the laser light source 3 is intensity-modulated according to the formula (1), and the laser beam 4a having a constant intensity is converted into a pulsed laser beam 4b corresponding to the recording signal s. The objective lens 7 is positioned at a first track forming portion of the optical disc master 1 which is rotated and driven under the control of the CPU 19, focuses the intensity-modulated laser beam 4b on this portion, and records data for the first sector. Make a record.

Subsequently, when the next sector start signal b is output from the counter circuit 20, the header signal generation circuit 21
Outputs a header signal c to be recorded in the second sector of the first track, and a first buffer memory 31 outputs a data signal a to be recorded in the second sector of the first track. Is recorded in the second sector. Thereafter, until all the data signals stored in the first buffer memory 31 are output, data recording for the third and subsequent sectors of the first track is performed in the same procedure as described above.

Further, when the next sector start signal b is output from the counter circuit 20, the data signal a to be recorded on the optical disk master 1 from the second buffer memory 32 this time.
Is output, and data recording on the optical disc master 1 is performed. Hereinafter, the counter circuit 2 is operated until all the data signals stored in the second buffer memory 32 are output.
Each time a sector start signal b is output from 0, a data signal a to be recorded on the optical disk master 1 is output from the second buffer memory 32, and data recording on the optical disk master 1 is performed. Then, the first buffer memory 3
1 after all the data signals stored in the first buffer memory 31 have been output until the transfer of the data signals stored in the first buffer memory 31 is started again. The data is written to the first buffer memory 31.

Hereinafter, similarly, the data transfer from the first buffer memory 31 to the signal synthesizing circuit 22 and the data transfer from the second buffer memory 32 to the signal synthesizing circuit 22 are alternately repeated. A header signal c, a data signal a, and an error correction code are recorded in each sector of the track. The optical disk master exposure apparatus of the present embodiment also has the same effects as the optical disk master exposure apparatus of the first embodiment.

Third Embodiment A third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a block diagram of the signal generator according to the third embodiment, and FIG. 7 is a timing chart illustrating the operation of the signal generator according to the third embodiment. The optical disk master exposure apparatus of the present example is characterized in that the internal configuration of the signal generator 6 is changed as shown in FIG.
The overall configuration is the same as that of the first embodiment (see FIG. 2).

As shown in FIG. 6, in the signal generator 6 according to the present embodiment, an upper buffer memory 33 is connected to an output terminal of the drive device 12, and a lower buffer memory 34 is connected to an output terminal of the upper buffer memory 33. It is connected. The upper buffer memory 33 is composed of a semiconductor memory having a storage capacity of a plurality of sectors, and the lower buffer memory 34 is
It is composed of a semiconductor memory having a storage capacity for sectors. The other parts are the same as those of the signal generating unit of the first embodiment, and therefore, in order to avoid duplication, corresponding parts are denoted by the same reference numerals and description thereof is omitted.

Hereinafter, the operation of the optical disk master exposure apparatus according to this embodiment will be described with reference to FIG. The master medium 11 on which all data signals to be recorded on the optical disc master 1 are recorded is mounted on the drive device 12, and the data signal a read by the drive device 12 is stored in the upper and lower buffer memories 33 and 34, Further, when the optical disc master 1 is driven to rotate, the counter circuit 20
Outputs a header signal c to be recorded in the first sector of the first track from the lower buffer memory 34.
Outputs a data signal a to be recorded in the first sector of the first track. The header signal c and the data signal a are combined by the signal combining circuit 22 and output from the signal combining circuit 22 as a combined signal d. Composite signal d
Is modulated by the modulation circuit 23 and output from the modulation circuit 23 as a desired recording signal s. The optical modulator 5 modulates the intensity of the laser beam 4a emitted from the laser light source 3 according to the recording signal s, and turns the laser beam 4a having a constant intensity into a pulsed laser beam 4b corresponding to the recording signal s. The objective lens 7 is positioned at a first track forming portion of the optical disc master 1 which is rotated and driven under the control of the CPU 19, focuses the intensity-modulated laser beam 4b on this portion, and records data for the first sector. Make a record.

The data signal to be recorded in the second sector of the first track after the data signal stored in the lower buffer memory 34 is output and before at least the next sector start signal b is output from the counter circuit 20. Is transferred from the upper buffer memory 33 to the lower buffer memory 34 to prepare for the next recording operation. Then, the counter circuit 20
When the next sector start signal b is output from, the data signal to be recorded in the second sector of the first track is recorded in the same procedure as described above. Further, the data signal read from the master medium 11 is written to the upper buffer memory 33 at a necessary timing. Hereinafter, similarly, the data transfer from the lower buffer memory 34 to the signal combining circuit 22 and the data transfer from the upper buffer memory 32 to the lower buffer memory 34 are alternately repeated, so that the header signal is added to each sector of each track. c, the data signal a, and the error correction code are recorded. The optical disk master exposure apparatus of the present embodiment also has the same effects as the optical disk master exposure apparatus of the first embodiment.

In each of the above embodiments, a master exposure apparatus for manufacturing an optical disk of a constant angular velocity type has been described. However, the present invention can be applied to a master exposure apparatus for manufacturing an optical disk of a constant linear velocity type. it can.

[0035]

As described above, according to the present invention,
The signal generator includes a drive device for reading a data signal from a master medium as a data source, and a plurality of buffer memories are connected to an output end of the drive device, and the data signal read from the drive device is stored in the buffer memory. Transfer to the optical modulator via the optical modulator, so that data recording for each sector can be realized without using a large-capacity semiconductor memory device capable of storing all data signals to be recorded on the master optical disc, and a constant angular velocity method. Of the read-only type optical disc master can be performed. Therefore, the storage capacity of the semiconductor memory device to be provided in the signal generation unit can be reduced, and the signal generation unit and, consequently, the optical disk master exposure apparatus can be configured at low cost. Also,
Since the cutting of the master optical disc can be performed while reading the data signal from the master medium, it is not necessary to temporarily store the data signal recorded on the master medium in the semiconductor memory device, and the time required for cutting the master optical disc can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a signal generation unit according to a first embodiment.

FIG. 2 is an explanatory diagram of an optical disk master exposure apparatus.

FIG. 3 is a timing chart showing the operation of the signal generator according to the first embodiment.

FIG. 4 is a block diagram illustrating a configuration of a signal generator according to a second embodiment.

FIG. 5 is a timing chart showing an operation of a signal generator according to a second embodiment.

FIG. 6 is a block diagram illustrating a configuration of a signal generator according to a third embodiment.

FIG. 7 is a timing chart showing the operation of the signal generator according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk master 2 Spindle motor 3 Laser light source 5 Optical modulator 6 Signal generator 7 Objective lens 11 Master medium 12 Drive device 14-16 Buffer memory 19 Central processing unit (CPU) 20 Counter circuit 21 Header signal generation circuit 22 Signal synthesis circuit 23 Modulation circuit 31-34 Buffer memory

Continuation of the front page (72) Inventor Tamotsu Iida 1-88 Ushitora, Ibaraki-shi, Osaka Hitachi Maxell, Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 20/10 311 G11B 7 / 00

Claims (4)

(57) [Claims] 1. A spindle motor for rotating a master optical disc in a constant angular velocity mode, a laser light source, an optical modulator for modulating a laser beam emitted from the laser light source, and a recording signal supplied to the optical modulator. In an optical disc master exposure apparatus, comprising: a signal generation unit; and an objective lens for focusing a laser beam signal-modulated on the optical disc master, wherein the signal generation unit records all data signals to be recorded on the optical disc master. Device for reading a data signal recorded on the master medium by mounting the master medium, a plurality of buffer memory groups composed of semiconductor memories connected to the output end of the drive device, and a data signal for the buffer memory group. A controller for controlling the input and output of the A counter circuit for outputting a sector start signal at a timing corresponding to a start position of a sector, and a header signal generating circuit for generating and outputting a header signal unique to each sector each time the sector start signal is output from the counter circuit A signal synthesis circuit that synthesizes the data signal and the header signal, and a central processing unit that controls the entire device. Each time the sector start signal is output from the counter circuit, the header signal generation circuit A header signal is output, and a data signal for one sector is transferred from any one of the buffer memories in the buffer memory group to the signal synthesizing circuit based on a command from the central processing unit, and the data for the optical disk master is transferred. Recording, and during the data recording, the next transfer from the master medium to the buffer memory group is performed. Transfer of the data signal and the optical disc master exposure apparatus, characterized in that the transfer of data signals between the buffer memory. 2. The high-order buffer memory according to claim 1, wherein said buffer memory group is connected to an output terminal of said drive device and has a storage capacity of at least a plurality of sectors and is parallel to an output terminal of said high-order buffer memory. And two lower buffer memories each having a storage capacity of at least one sector connected to the first circuit. Each time the sector start signal is output from the counter circuit,
The data signal for one sector is alternately transferred from the lower buffer memory or the second lower buffer memory to the signal synthesizing circuit to record data on the optical disk master. An optical disk wherein data transfer from the upper buffer memory to the other lower buffer memory and transfer of a data signal from the master medium to the upper buffer memory are performed while data is being transferred to the lower buffer memory. Master exposure equipment. 3. The buffer memory group according to claim 1, wherein the buffer memory group includes two buffer memories having a storage capacity of at least a plurality of sectors connected in parallel to an output terminal of the drive device. Each time the sector start signal is output, the data signal is sequentially transferred from one of the buffer memories to the signal synthesizing circuit by one sector at a time, and data is recorded on the optical disc master. After all the stored data signals have been transferred to the signal synthesizing circuit, the data signals are sequentially transferred from the other buffer memory to the signal synthesizing circuit one sector at a time to record data on the optical disk master. During data transfer from one of the buffer memories to the signal synthesis circuit To the other buffer memory
An optical disk master exposure apparatus, wherein data is transferred from the master medium . 4. The high-order buffer memory according to claim 1, wherein the buffer memory group is connected to an output terminal of the drive device and has a storage capacity of at least a plurality of sectors and is connected to an output terminal of the high-order buffer memory. One lower buffer memory having a storage capacity of at least one sector, and each time the sector start signal is output from the counter circuit, a data signal of one sector is output from the lower buffer memory to the signal. The data is transferred to the synthesizing circuit to record data on the master optical disc. After the data transfer from the lower buffer memory to the signal synthesizing circuit is completed, the data transfer from the lower buffer memory to the signal synthesizing circuit is started again. Data transfer from the upper buffer memory to the lower buffer memory during An optical disk master exposure apparatus, wherein a data signal is transferred from the master medium to the upper buffer memory during data transfer from the lower buffer memory to the signal synthesizing circuit.