JPH0262994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing disk and a recording apparatus for producing a disk master for producing the recording/reproducing disk.

Conventionally, in order to make a recording/playback disc that can record and play back, it is first necessary to record only a tracking signal on a master disc in advance, and then create a large number of replica discs with tracking signals recorded from this master disc to use as a recording/playback disc. It was done. When recording a video signal on the unrecorded disc, it is sufficient to record it next to the above-mentioned tracking signal, but as mentioned above, a track dedicated to the tracking signal must be provided next to the track for the recording signal. First, it had the disadvantage of lower recording density.

The present invention has been made to eliminate the above-mentioned drawbacks, and the recording/reproducing disk and recording apparatus of the present invention will be explained in detail below with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing an example of an apparatus for manufacturing a recording/reproducing disk master according to the present invention. A laser beam from an Ar laser 1 is applied to an optical system 3 via an optical modulator 2. As shown in FIG. The optical system 3 has a well-known structure consisting of mirrors 3-1, 3-2 and a lens 3-3, the laser beam is focused on the master 6, and the reflected light is sent to the focus servo via the photodetector 4. added to device 7;
The focus of the lenses 3, 3 is controlled. An output 9-1 of the synchronizing signal generator 9 is applied to the modulation input terminal of the optical modulator 2, and an output 9-2 is applied to the control input terminal of the motor 5 for rotating the master 6 and the optical system 3. The master disk 6 is a well-known glass master disk coated with photoresist or metal film deposited, and the optical system 3 and motor 5 are controlled by control signals from a synchronous signal generator.

In the above configuration, the synchronization signal generator 9 is
Based on the periodic signal of the NTSC system as shown in Figure a, only the peak level period 21 of each horizontal and vertical synchronizing signal corresponds to the peak level A of the synchronizing signal or equalization pulse as shown in Figure 3 b. Generates a pulse train of FM frequency. This pulse train is generated only during each peak level period of the synchronization signal, and is stopped during the blank period 23 including the front porch, back porch, and video signal period. The optical modulator 2 modulates the laser beam according to the pulse train and irradiates the master 6 on and off at the FM frequency only during the period of the pulse train to record the synchronization signal. Next, the master disc 6 on which the synchronization signal has been recorded is used as a master disc and is transferred by a plating method or the like to create a standby, and this standby is used to create the recording/reproducing disc of the present invention.

FIG. 2 shows an example of an apparatus for recording video signals on the recording/reproducing disk thus produced. In the figure, the same reference numerals are given to parts having the same functions as in FIG. The laser beam from the semiconductor laser 11' passes through the optical system 3,
The focus is focused on the same location on the recording/reproducing disk 6' driven by the motor 5. The reflected light from the recording/reproducing disk 6' is taken out by the photodetector 4 as a video output 7 and a control output, and the control output is applied to a control system 10 to control the lens system 3, and the video output 7 is synchronized. The signal is applied to the video signal generator 12 via the separation circuit 13.

In the above configuration, the operation during recording will be explained first. First, the video signal generator 12 including a TV camera etc.
generates an FM modulated video signal, which is added to the recording semiconductor laser 11 and controls the on/off of the recording laser beam. In this case, the video signal is synchronized with the pre-recorded synchronization signal, and
It is necessary to record the video signal only in the blank period 23 in FIG. For this reason, the reproducing semiconductor laser 11' constantly irradiates the reproducing laser beam, which is so weak that it will not cause any recording, to reproduce the recording/reproducing disk 6' using the photodetector 4, and the synchronization separation circuit 13 activates the previously recorded information. The synchronizing signal that is displayed is separated and applied to the video signal generator 12 to synchronize the video signal with the synchronizing signal and set the phase so that the video signal is inserted into the blank period 23. . Furthermore, in order to prevent any recording from occurring during the peak level period 21 of the synchronizing signal, the recording laser beam is turned off during this period 21. The prerecorded synchronization signal is also reproduced by the photodetector 4 as a tracking signal, and the tracking signal causes the control system 10 to control the lens system 3 to follow the synchronization signal.

Next, in order to reproduce the recording/reproduction disk 6' on which a video signal has already been recorded, the recording laser 11 is turned off, the reproduction laser 11' irradiates the disk 6', and the photodetector 4 reproduces the signal.

In the above explanation, only the peak period of the synchronization signal is recorded in advance on the recording/reproducing disk, but the entire period of the synchronization signal including the front porch, back porch period, or pilot signal etc. of the synchronization signal can be recorded on the FM. It may be modulated and recorded. Even in this case, as described above, the laser beam is turned off and no recording is performed during the blank period 23 corresponding to the video signal period.
Note that the present invention is of course not limited to the NTSC system, and can be applied not only to optical discs but also to, for example, capacitive discs.

It should be noted that the audio signal may be time-compressed and recorded entirely in the video signal period in order to avoid omissions in the synchronization signal portion. Regarding such a recording means, a detailed description thereof will be omitted because, for example, a method of converting an audio signal into a digital signal and then compressing the time is well known. If the audio signal cannot be time-compressed, the audio signal in the synchronization signal portion is recorded alongside the synchronization signal.

That is, the recording light beam is controlled so as to record in the blank space between the track currently being recorded and the next track. In this case, a separate auxiliary beam for reproduction may be used to reproduce the synchronization signal for tracking.

As described above, according to the present invention, since the synchronization signal is recorded in advance on the recording/reproducing disk, it is possible to easily add a video signal to a position corresponding to a video period. Further, since there is no need to separately provide a track for recording a tracking signal as in the prior art, effects such as increased recording density can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a disk master manufacturing apparatus that can be used in the present invention;
FIG. 2 is a block diagram showing an example of a recording/reproducing apparatus for a recording/reproducing disk according to the present invention, and FIG. 3 is a waveform diagram showing an example of a recording signal. In the figure, 1 is a laser, 3 is an optical system, 6 is a recording master disk, and 6' is a recording/reproducing disk.

Claims (1)

[Scope of Claims] 1. In a recording/reproducing disk on which a tracking signal indicating a track on which a video signal is to be recorded has been recorded in advance, each synchronizing pulse of a horizontal and vertical synchronizing signal is recorded in the tracking signal. A blank section in which pits are not recorded is provided at a position where each video signal between the pit columns should be recorded as a pit row, and the blank section is used as an additional recording section. A recording/playback disk. 2. In a recording device that records a tracking signal on a rotating disk master by irradiating a laser beam onto the rotating disk master, means for modulating the laser beam with an FM signal that is FM modulated by a synchronization signal of a video synchronization signal; 1. A recording device for recording a tracking signal for a recording/reproducing disk master, comprising means for interrupting irradiation of the laser beam during a video signal period of a video synchronization signal.