JPS60239924A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To record animations or the like continuously by counting recording positioning mark pulses and terminating recording when the counted value coincides with a prescribed value and performing continuous recording after the number of tracks to be recorded continuously is set optionally. CONSTITUTION:When pictures are recorded continuously on N-number of tracks of a disc, the number of recording tracks is preset to a resister 30 from a system control 10. Next, a trigger pulse (k) is outputted to a tracking control circuit 24 from the system by the recording start command from a console, and a trigger pulse (a) is outputted to a REC gate circuit 33 and a down-counter 31 after a light spot is moved temporarily one track inward from the recording start track, and the preset number N of recording tracks is set. While a recording gate signal (f) is in the high level, a laser driving circuit 11 modulates the intensity of the output of a diode 12 in accordance with input video and records it on a disc 1. A disc motor 6 is rotated and controlled so that recording positioning mark pulse is within a vertical blanking interval, and thereby, the number of tracks is set optionally to perform continuous recording.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an optical recording/reproducing device, and more specifically, an optical recording/reproducing device equipped with a recording control circuit that enables continuous recording of moving images, etc. on a television receiver screen. This invention relates to an optical recording/reproducing device.

[Background of the invention]

Now, as a device for recording video signals, audio signals, or digital signals at high density on a recording medium and reproducing the recorded signals, for example, there is an optical recording/reproducing device.

This device irradiates a disc-shaped record carrier (hereinafter referred to as a disk) coated with a photosensitive material with a light beam (hereinafter referred to as a light spot) from a laser light source, and converts the light output intensity into a recording signal. By modulating the light irradiation area to melt and evaporate it, or by changing the light reflectance or transmittance, it is recorded as a change in optical characteristics, and the recorded information is reproduced by detecting the change in optical characteristics. This is what we do.

For the purpose of increasing the density of recording tracks and eliminating the effects of eccentricity, optically detectable guide grooves (hereinafter referred to as guide tracks) are provided in advance on the disk, and the optical spot is formed on this guide track. Recording and reproduction are performed while focusing and applying tracking control to follow the meandering of the guide track due to eccentricity.

FIG. 1 is an explanatory diagram showing an example of such a disk.

In the figure, only two adjacent concentric tracks 2 and 3 are shown to simplify the explanation.

On the disk, along with tracks (groove-shaped guide tracks) applied during manufacture, address signals 4 for mutually identifying each track are formed in a concave-convex form attached to each track. In addition, recording alignment marks 5 used to align the recording start positions for each track are also formed in a concave and convex shape.

FIG. 2 is an explanatory diagram showing an example of a general recording/reproducing apparatus for recording information on a disk having concentric guide tracks.

In the figure, 1 is a disk, 6 is a disk motor that rotationally drives the disk 1, 7 is a photosensor, 8 is a waveform shaping circuit, 9 is a recording control circuit, 10 is a system control circuit, 11 is a laser drive circuit, and 12 is a A laser diode, 13 a condensing lens, 14 a concave cylindrical lens, 15 a convex cylindrical lens, 16 a deflection beam splitter, 17 a quarter wavelength plate, 18 an actuator, 19 an objective lens, 20 a convex lens, 21 is a mirror, 22.25 is a two-split photodiode, 23.26 is a differential amplifier, 28 is an amplifier, 24 is a tracking control circuit, 27 is a focus control circuit, and 29 is an address demodulation circuit.

FIG. 3 is a circuit diagram showing details of the recording control circuit 9 in FIG. 2. In the same figure, 9a is an R-8 flip-flop, 9b and 9e are each an AND circuit, 9C is a flip-flop, 9d is an OR circuit, 9f and 9h are each a resistor, 9g and 9i are each a capacitor, and 9j is an NO
It is a T circuit.

FIG. 4 is a timing chart showing the waveforms of the various signals in FIGS. 2 and 3. FIG.

The circuit operation will be explained with reference to FIGS. 2 to 4. When recording information, the system control circuit 10 comprising a microphone, a computer, etc. first outputs a REC trigger pulse (a) to the recording control circuit 9 as a signal instructing the start of recording.

On the other hand, an output (c
) is subjected to waveform shaping in the waveform shaping circuit 8, and the waveform shaped output signal (d) thus obtained is input to the recording control circuit 9. In the recording control circuit 9, the REC trigger pulse (a) is applied to the set terminal S of the R-S flip-flop 7'9a.
This set output (b) and the output (d) from the waveform shaping circuit 8 are input to the AND circuit 9b.

The output (e) of the AND circuit 9b is output from the flip-flop 9c.
As a result, the output (f) of the flip-flop 9c rises to a high level. The output (f) is set to 5 so that it falls and changes to a low level when the second signal (e) is input to the CK terminal.

Therefore, the output (f) is used as a REC gate signal.
REC) During one rotation of the disk 1 from when the first recording positioning mark pulse (d) after the trigger pulse (a) is input until when the next recording positioning mark pulse (d) is detected By maintaining the high level, the laser drive circuit 116 is driven to record one track on the disk 1.

The falling edge of the REC gate signal (f) is detected by the resistor 9f, capacitor 9g and AND circuit 9e,
The detection output port) is inputted to each reset terminal R of the flip-flops 9a and 9C through the OR circuit 9d, and the recording operation for one track is completed.

Note that the resistor 9h, capacitor 91, and NOT circuit 9j are circuits provided to reset the flip-flops 9a and 9C when the power is turned on.

In the laser drive circuit 11, while the REC gate signal (f) is at a high level, the output of the laser diode 12 is intensity-modulated in accordance with a separately input video signal.

The light beam generated from the laser diode 12 is converted into parallel light by a condensing lens 13, and further converted from a light beam having an elliptical cross section to a light beam having a substantially circular cross section by a concave cylindrical lens 14 and a convex cylindrical lens 15. be done.

The light beam converted into a circular cross section is incident on the objective lens 19 attached to the actuator 18 through the polarizing beam sinter 16 and the quarter-wave plate 17, and after being narrowed down by the objective lens 19, it is focused on the optical sensitivity of the disk 1. A light spot is irradiated onto the material surface, and the light irradiated area is melted and evaporated, or the reflectance or transmittance of that area is changed to record on the disc.

The reflected light from the disk 1 is again passed through the objective lens 19°1/
The beam is then guided to a convex lens 20 by a polarizing beam splitter 16 through a four-wavelength plate 17, and is split by a mirror 21, one of which is a two-split photo I/F for tracking error detection.
The light is input to the diode 22. The output of the two-split photodiode 22 is input to the left-hand amplifier 23, which detects the deviation of the optical spot from the guide track due to the imbalance of the diffracted light in the groove-shaped guide track of the disk 1, and outputs an output t representing this deviation. The actuator 18 is driven via the tracking control circuit 24 to move the objective lens 19 in the radial direction of the disk 10 so that the light spot follows the meandering of the guide track caused by the eccentricity of the disk 1.

On the other hand, the other light beam split by the mirror 21 is
The light is incident on a two-split photodiode 25 for focus error detection. The output of the two-split photodiode 25 is input to the differential amplifier 26, which detects the distance between the objective lens 19 and the disk 1, and this detection output is input to the focus control circuit 2.
7 to drive the actuator 18, and the objective lens 1
9 is moved in a direction perpendicular to the disk 1, and control is performed so that a light spot with a diameter of about 1 μm is obtained on the disk surface.

The output of the two-divided diode 25 is also input to an amplifier 28, and this output (j) is input to the system control circuit 10 through an address demodulation circuit 29 as an address signal representing a track address.

In this way, when recording is to be continued on the next track after one track has been recorded, the track jump trigger signal (k) from the system control circuit 10 is used to move the light spot to the track that is currently being followed. After moving from the track to the adjacent track, the system control circuit 10 outputs the REC) trigger pulse (a) again.

In this case, with conventional recording control circuits, it is necessary to output a REC trigger pulse for each track recording, so it is possible to record only every other rotation of the disk, and it is not possible to continuously record moving images such as those on a TV screen. The problem was that it was not possible. Further, when the guide track of the disk is formed into a spiral shape, it inherently has the characteristic that continuous recording can be easily performed, but this has not been possible with conventional recording control circuits.

Hereinafter, the above-mentioned problems in the prior art will be explained in more detail with reference to FIG.

FIG. 5 is an explanatory diagram of the recording surface of the disc 1 similar to FIG. 1. In the figure, the guide tracks are 2a, 2b, 2
It is assumed that three of c are formed.

Direction aM extending in the radial direction from the recording alignment mark 5
The points A, B, and C where the tracks intersect are the recording start positions of the tracks 2a, 2b, and 2c, respectively (time points at which the waveform shaping output (d) described above is generated).

First, considering track 2a, after the REC trigger pulse (a) is output from the system control circuit 10, when the optical spot comes to point A, a waveform shaping output (d) as a positioning signal is generated and recording is started. will be started.

When the light spot goes around the track 2a once and returns to point A, recording on the track 2a is completed, the light spot jumps to point B, and now goes around the track 2b.

At this time, if the system control circuit 10 generates the REC) trigger pulse (a) without any time delay, it is possible to start the recording operation on the track 2b, but in general, the conventional method of applying the RFCEC trigger pulse every track recording is possible. In the recording control circuit, the RFC) trigger pulse is not output immediately after the recording of the track 2a is completed, but the trigger pulse is output with a slight time delay. In the meantime, the light spot passes the point B on the track 2b.

Conventionally, recording was started when the optical spot returned to point B after the disk had rotated once.

That is, after the track 2a is recorded, recording is not performed until the disk rotates once, and no video signal is recorded during that time.

This is fine when the target of recording is a still image, but in the case of a video, the screen changes while the recording is paused until the disk rotates once.
You can't hope to faithfully record the video, and focus on the problems that occur.

Although the above explanation has been given for the case where the guide tracks are formed in a concentric circle shape, the situation is exactly the same when the guide track is formed in a spiral shape.

[Purpose of the invention]

The present invention has been made in order to solve the problems of the prior art as described above, and an object of the present invention is to solve the problems of the prior art as described above, and therefore, an object of the present invention is to provide a track 1 for a disk in which guide tracks are formed concentrically or spirally. The object of the present invention is to provide an optical recording/reproducing device that enables continuous recording on all tracks without any alternation.

[Outline and summary of the invention]

Therefore, in the present invention, in order to achieve the above object, information is recorded on an information recording track formed spirally or concentrically on a disk-shaped recording medium (hereinafter referred to as a disk), or information is extracted from the track. Number of tracks that should be continuously recorded in an optical recording/playback device for playback (one track is the trunk length corresponding to one revolution of the disk)
means for setting in advance the information recording means for the disk by a logical AND output of a reference position signal and a recording start command signal generated for each rotation of the disk; means for detecting a generated reference position signal and subtracting that number from the number of tracks set in the setting means; and means for turning off the information recording means when the subtraction result reaches a specific value;
It is characterized by having the following.

[Embodiments of the invention]

The present invention will now be described in detail with reference to the drawings.

FIG. 6 is an explanatory diagram showing an embodiment of the present invention.

In this figure, the same or corresponding elements as in FIG. 2 are given the same reference numerals.

The embodiment shown in FIG. 6 differs from the conventional apparatus shown in FIG. 2 in the configuration of the recording control circuit 9.

The recording control circuit 9 includes a register 30 and a down counter 31.
, a zero detection circuit 32, and a FLEC gate circuit 33.

In the apparatus shown in FIG. 6, the circuit operation will be described assuming that N tracks are continuously recorded on a disk having concentric guide tracks.

First, the desired number N of tracks is input to the system control 10 using an operation console (not shown), and the number N of recording tracks is preset in the register 30 from the system control 10. Next, in response to a command to start REC from the operation console, the system controller 10 outputs a track jump trigger pulse (k) to the tracking control circuit 24, and the light spot is temporarily moved from the recording start track to the inner track (see Fig. 5). In other words, after moving the REC) trigger pulse (a) to a track (not shown) that is one track further inward than track 2a,
It is output to the gate circuit 33 and the down counter 31, and the number N of recording tracks preset in the register 30 is set in the down counter 31.

After inputting the REC trigger pulse (a), the RFC gate circuit 33 sets the REC gate signal (f) to a high level at the rising edge of the first recording position alignment mark pulse (d). In the laser drive circuit 11, the REC gate signal (f)
While the signal is at a high level, the output of the laser diode 12 is intensity-modulated according to the input video signal, and recording is performed on the disc 1.

The tracking control circuit 24 generates a track jump trigger pulse (
k) is input, and a track jump of the light spot from track to track is performed.

Since the input video signal is not recorded on the track while a track jump is being performed, when recording the video signal, the rotational speed of the def/sf motor 6 should be adjusted so that the recording position alignment mark pulse falls within the vertical retrace period. It is necessary to control the screen so that the screen does not become distorted during playback.

On the other hand, the recording position alignment mark pulse; /(d) is input to the clock input terminal of the down counter 31, and when the disk rotates N times and recording is completed for N1-racks, the value of the down counter 31 becomes zero.

The zero detection circuit 32 detects that the count of the down counter 31 has reached zero, outputs a reset pulse (1) to the REC gate circuit 33, resets the REC gate signal (f) to low level, and switches the laser diode The output of No. 12 is assumed to be a constant output during reproduction.

FIG. 7 shows a specific example of the tEC gate circuit 33.

FIG. 8 shows the timing of each part signal at the time of REC when the number of recording tracks to be set in the down counter 31 is set to 2.

The circuit operation will be explained with reference to FIGS. 7 and 8.

In FIG. 7, during REC, the REC) trigger pulse (°a) from the system control circuit 10 causes R
The -8 flip-flops 33a and 33h are set, and the number N of recording tracks preset in the register 30 is set in the down counter 31. The output (b) of the R-8 flip-flop 33a is input to the recording position alignment mark pulse (d) and an AND circuit 33b. A
The output (e) of the ND circuit 33b is the flip-flop 33c.
and the clock terminal CK of the down counter 31.

I'(-S The Q output (u') of the flip-flop 33a and the output (m) of the flip-flop 33c are connected to the OR circuit 33d.
This output (n) is input to the flip-flop 33e.
The signal is input to the clock terminal CK and the NOT circuit 33f. The output (o) of the flip-flop 33e and the recording position alignment mark pulse (d) are input to an AND circuit 33i,
This output (p) is input to AND circuits 33g and 33j. Output of NOT circuit 33f, flip-flop 33
The output (0) of e and the output (p) of the AN17-D circuit 33i are ANDed by an AND circuit 33j, and this output (q) is sent to the R-S flip-flop 3.
It is input to the reset terminal H of 3h.

The output (r) of the R-S flip-flop 33h and the output (p) of the AND circuit 33i are ANDed by an AND circuit 33j, and this AND output (S) is used as the REC trigger pulse (
The signal is obtained by extracting the first recording position alignment mark pulse (d) after input of signal a). R
-8 flip-flop 33 has this AND circuit 33j
It is set by the output (S) of the REC gate signal (f) and makes the REC gate signal (f) high level.

On the other hand, the value of the counter 31 is counted down each time the disk rotates once and one track is recorded, and becomes zero when N tracks have been recorded. The zero detection circuit 32 detects this and outputs a reset pulse (t) to the OR circuit 331. The output of the OR circuit is R-8 flip-flop 3.
3, the REC gate signal (
f) to low level and flip-flop 3
3a, 33c.

33e to each reset terminal R, and each frit 18- Reset the block to its initial state.

The resistor 33n1 capacitor 33p and NOT circuit 33m connect the flip-flop 33a when the power is turned on so that the REC gate signal (f) does not go to high level when the power is turned on.
, 33c, 33e, and 33k.

In this embodiment, the guide tracks of the disk are concentric circles, but they may also be spiral. Figure 9 shows a timing diagram when N tracks are continuously recorded on a disk having a spiral guide track. In the case of a spiral guide track, it is not necessary to perform a track jump every time a recording position alignment mark is detected during the recording period.

Further, after outputting the track jump trigger pulse (k) during recording, it is desirable to read the track address signal on the disk and confirm that the track jump has been reliably performed.

In addition, in this embodiment, the number of recording tracks N is input to the system control using the console, but the address N1 of the recording start track and the address N2 of the recording end track are input to the system control using the console. The difference (N2-N1) may be calculated by a system control microcomputer or the like and set in a register. Alternatively, the required recording time T may be input into the system control via the console, the number of revolutions per TX unit time may be calculated, and this may be set in the register 30 (1°. Although the number of tracks was counted using the signal detected by the recording positioning mark 5 recorded in advance on the disk, the count is not limited to this. Good too.

〔Effect of the invention〕

As explained above, according to the present invention, in an optical recording/reproducing apparatus, recording is continuously performed by counting each recording positioning mark detected and terminating recording when this value matches a predetermined value. You can arbitrarily set the number of tracks to be recorded and perform continuous recording.
It is possible to continuously record videos, etc. on a TV screen.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a disk, FIG. 2 is an explanatory diagram showing an example of a conventional recording/reproducing device, FIG. 3 is a circuit diagram showing details of the recording control circuit 9 in FIG. 2, and FIG. is the second
, a timing diagram showing the waveforms of various signals in FIG. 3, FIG. 5 is an explanatory diagram of the disk surface for explaining the problems of the prior art, and FIG. 6 is an explanatory diagram showing one embodiment of the present invention.
FIG. 7 is a circuit diagram showing a specific example of the REC gate circuit 33 in FIG. 6, FIG. 8 is a timing diagram of various signals in FIGS. 6 and 7, and FIG. 9 is a circuit diagram showing a specific example of the REC gate circuit 33 in FIG. This is a timing diagram when recording. Description of symbols 1...Disc, 5...Recording position alignment mark, 6...Disc motor, 7...
・Photo sensor, 8...Waveform shaping circuit, 9...
... Recording control circuit, 10 ... System control circuit, 11 ... Laser drive circuit, 12
... Laser diode, 30 ... Register, 31 ... Down counter, 32 ...
...Zero detection circuit, 33...REC gate circuit agent Patent attorney Akio Namiki Figure 4 tIE5 Figure

Claims (1)

[Claims] 1) Optical recording in which information is recorded on an information recording track formed in a spiral or concentric manner on a disk-shaped recording medium (hereinafter referred to as a disk), or in which information is reproduced from the track. In a playback device, means for presetting the number of tracks to be continuously recorded (one track is a track length corresponding to one revolution of the disc), a reference position signal generated every one revolution of the disc, and a recording start. means for turning on information recording means for the disk by outputting a logical product of command signals; and a means for detecting a reference position signal generated every rotation of the disk after that, and the number of tracks set in the setting means by that number; 1. An optical recording/reproducing apparatus comprising: means for subtracting from the information recording means; and means for turning off the information recording means when the subtraction result reaches a specific value. 2. In the optical recording/reproducing apparatus according to claim 1, the information recording means is moved to a track position one track before the recording start track on the disk (in the opposite direction to the recording direction), and then the An optical recording/reproducing device characterized in that it generates a recording start command signal. 3) In the optical recording and reproducing apparatus according to claim 2, the fact that the information recording means has moved to a track position one track before the recording start track on the disc is detected by a track recorded on the disc. An optical recording/reproducing device characterized in that confirmation is performed using an address signal.