JPS5829150A - Master disc manufacturing device for optical disc - Google Patents

Abstract

PURPOSE:To make high-speed cutting possible, by reproducing information from an optical disc device possible for recording and reproduction at high spees and supplying this reproduced signal to a master disc cutting device. CONSTITUTION:An output reproduced from an optical disc device possible for recording and reproduction at high speeds is converted into a format of a digital audio signal at a decoder 19, given to an electrooptic modulator 23, where an output of a laser 25 is modulated for recording on an optical disc 27 through an optica system 26. A clock is extracted from an output of the decoder 19 and the control of a rotating system 34 is executed so that the line speed of a recording track can be made constant. A signal is reproduced from a disc recorder and reproducer instead of a tape recorder at high speeds for cutting, allowing to attain high-speed cutting without giving damage to a recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical disc master manufacturing device, and is particularly suitable for use in a system that supplies high-speed playback signals to an optical disc cutting device. 1 is a boot diagram of a general digital audio e-disk master production system to which the present invention is applied. As is well known, conventionally, an audio signal is converted into a digital signal using an A/D converter/IA device (1).

- Record using the i-yoshiki tape with the fIk playback device (2) (digital audio recorder). Next, the recording/reproducing device (2) is set to playback mode, and a playback signal is sent to the optical disc cutting machine (3) to create a master disc.

In addition, at the stage of playing back the recording/playback machine (2), editing may be performed using two record/playback machines.・Recording/playback machine (2)
will be played back at the same speed as when it was normally recorded. When high-speed playback is performed, the playback signal tends to deteriorate and the tape wears out rapidly. Therefore, when cutting a music signal of 60 minutes, a cutting time of %68 minutes is required.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to stably perform high-speed cutting.

Figure 2 shows the optical disc master manufacturing system of the present invention.
FIG. 2 is a four-dimensional diagram of an optical disc recording/reproducing apparatus (2) used in the optical disc recording and reproducing apparatus (2). This recording and reproducing machine uses an optical disc (4) that can be recorded and reproduced. As the recording medium, a deposited film of tellurium, selenium, etc. is used, and a laser beam (5) modulated with recording information is emitted onto the film to form bits. The input digital audio signal is supplied from the terminal to the encoder (7), where it is converted into a signal that matches the recording format of the optical disc.
The output of 7) is passed through a laser driver (8) to an optical head (9) consisting of a laser (9) and a lens (1 (I us).
11, and a laser beam (gloss) that is on-off modulated according to the recording signal is irradiated onto the disk (4).

The digital audio signal 1 applied to the terminal (6) has a self-clock format, and is applied to the clock extracting circuit a, from which the clock b (for example, 1) is extracted. The clock b is given to the N output 11a4, where it is output at 1/10, for example. The output (100Hz) of the frequency divider α◆ is the CPU α of the microcomputer.
The output is applied to the rotating servo yarn wheel through the output, and the rotating system (17) (DC motor, etc.) is locked (phase locked) to the clock divided by 1710. As a result, the disk (4) is driven to rotate at a constant angular velocity [(CAW) of, for example, SOOrpm.

During playback, the optical head α2 is operated as a pickup, and its playback output is delivered as a digital audio signal C from a terminal (2) to a cutting machine (3) through a playback amplifier Kasumi and a decoder.

The output of the reproduction amplifier a is also given to a clock extracting circuit 9, from which the reproduction signal d is extracted. During playback, the disk (4) is rotated, for example, at five times the speed of recording. Therefore, the frequency of the reproduced clock d is, for example, three times (
3KH! ,)It has become. The extracted clock d is supplied to (mxN) branching devices, and for example, when m=3, 1
/! The frequency is divided by l×10.

The output of the frequency divider (to) is the same as the frequency of the output of the N frequency divider (14) on the recording side (for example, 100H2). This frequency divided clock is given to the rotation servo system aQ via the CPU α9, and its output is As a result, the rotation system aη is locked (phase fixed).Therefore, the disk (4) stably rotates at a rotation speed six times that of recording (for example, 900 rpm).This reduces the cutting time to 1/S (60 minutes). If it is a music signal, it will be shortened to 20 minutes).

From the CPU-, playback speed information m corresponding to m of the frequency division ratio m×N in the frequency divider 4 is sent to the cutting machine (33
K is output.

FIG. 3 is a block diagram of an optical disc cutting machine. The playback output of the recorder/player (2) of the 2nd figure is the 2nd
The decoder 4 also shown in the figure converts the signal into a general digital audio signal format and sends it to the electro-optical converter 146@. With this variable mWh @, the output of the laser (to) that continuously generates a laser beam (to) is on-off modulated, and the optical disc (to) is transmitted through the optical system (to).
b). In this cutting machine, only the optical system is moved in the radial direction of the disk by a feed system including a feed screw.

The recording signal C output from the decoder is sent to the clock readout circuit (
(to) from which the clock d is extracted. This clock d is given to a counter C31).

By measuring its j@ period or frequency, mV (
Information corresponding to V is the disk rotational angular velocity during recording in the recording/reproducing apparatus shown in FIG. 2, and m is the double speed ratio during reproduction. This information is given to the CPU.

Information r regarding the recording position in the radial direction of the disk surface is sent from the feed 9 system (2) of the optical system (c) to the CPU U. The CPU ■ calculates gr based on the above information mV and r, and keeps the linear velocity of the recording track constant (CLM).
Sends rotation speed information N such that The output of the rotating servo system (to) is sent to the rotating system (b),
CLV recording is performed at a constant linear velocity. The recorded disc is used as a DAD (digital audio disc) master.

In addition, the reproduction speed information m from the cp Utti of the recording and reproducing device in FIG. 2 is transferred to the CPU I33 in FIG. The rotation speed N at which the speed is constant may be calculated by the CPU.

Naori ADj [When editing music signals before creating a disc, two recording and reproducing apparatuses shown in FIG. 2 are used, and information is edited while performing high-speed reproduction in the same way as described above.

According to this embodiment, even if high-speed playback is performed when obtaining the input signal of the cutting machine or when editing, the playback signal will not be disturbed because the non-contact recording and playback method is adopted, and the recording medium will There is no risk of wear. In addition, high-speed playback can greatly reduce the amount of work involved in manufacturing master discs.

The recording/reproducing machine shown in FIG. 2 used in the above embodiment is as follows:
It can also be used in other application fields, such as video recorders, audio recorders, data recorders, and computer peripheral memories.

According to the present invention, as described above, when the rotational drive system of the optical disc recording/reproducing device is locked with a clock of a predetermined frequency and the recording is performed in row-1, the clock obtained from the reproduction signal is adjusted according to the reproduction speed ratio. Therefore, high-speed playback can be performed extremely stably without wearing out the recording medium or disrupting the playback signal.

It is possible to significantly shorten the cutting time during master production.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a general digital audio disc manufacturing system to which the present invention is applied, and FIG. 2 is a block diagram of an optical disc recording/reproducing machine used in the disc master manufacturing system of the present invention. , FIG. 6 is a block diagram of the optical disc cutting scissors body. The symbols used in the drawings are (1)...A/D converter (
2)・・・・・・・・・・・・ Recording and reproducing machine (3)
・・・・・・・・・・・・・Optical disk cutting machine (4)・・・・・・・・・・・・-Optical disk (shun・・・・・・・・・・・Laser beam a・・・・・・・・・・・・・Optical head (
IQ・・・・・・・・・・・・Rotary servo system aη
・・・・・・・・・・・・・・・It is a rotating system. Agent Katsu I Ueya Osamu Matsuzai (Voluntary) Procedural Amendment to the Commissioner of the Patent Office"': s56 * *'* m *127214 % (
21B) Sony Corporation 6, Number of Inventions Increased by Amendment In the Detailed Description of the Invention column (2) on page 6, line 14 of the same book, ``Send.Rotation'' is changed to ``Send. α is the linear velocity. Correct to "Rotation" which is a coefficient for setting to a predetermined value. −1 or more

Claims (1)

[Claims] A recordable and reproducible disk consisting of a recordable and reproducible optical disk driven by a rotary drive system and an optical head system for recording and reproducing, and an optical disk** cutting device to which a reproduction signal of the disk recording and reproducing device is supplied. When information is to be recorded on the disc in a manner capable of being recorded and reproduced, the rotary drive system is locked at a predetermined frequency to rotate the optical disc at a reference speed, and at the time of reproduction, a clock component is extracted from the reproduction signal. An apparatus for manufacturing an optical disc master, characterized in that the optical disc is rotated at a speed ratio of 1.