JP2000339684A - Optical disk recording and playback device - Google Patents

Abstract

(57) [Summary] In an optical disk recording / reproducing apparatus, a recording control circuit is set to a non-operating state to reduce a rise in temperature except during a recording or erasing operation. SOLUTION: An optical disk recording / reproducing apparatus 1 has an optical pickup 30 for recording or reproducing information on an optical disk 10. The microcomputer 100 includes the laser drive circuit 12
0, the recording control circuit 110 is controlled, and the light emission amount of the optical pickup is detected by the detection circuit 140, and the signal processing circuit 15
Sent to 0. The signal processing circuit controls the recording or reproduction signal S
6. Send an abnormal laser level signal S7, tracking off signal S8, etc. to the microcomputer 100. The microcomputer 100
In response to this, the recording control circuit is deactivated except during recording or erasing, thereby reducing heat generation and power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disk recording / reproducing apparatus using an optical disk such as a digital video disk (DVD).

[0002]

2. Description of the Related Art A DVD-RAM device emits a laser beam at a high output in order to record data on a RAM disk. The light emission amount of the laser is determined by the IL characteristic (the relationship between the applied current and the laser light output), and the laser does not oscillate unless a current equal to or higher than a certain threshold is applied. This IL characteristic has temperature dependence, becomes non-linear when the temperature rises, and the optical output does not increase proportionally even when the applied current is increased. For this reason, in order to emit light with the same light output amount even when the temperature rises, the applied current value must be increased.However, the increase in the applied current greatly affects the shortening of the laser life. Prevention is an important issue.

[0003]

SUMMARY OF THE INVENTION The present invention provides an apparatus for controlling the operation of a recording control circuit (encoder) to reduce power consumption and prevent a rise in temperature.

[0004]

SUMMARY OF THE INVENTION An optical disk recording / reproducing apparatus according to the present invention comprises: an optical pickup for recording and reproducing information on and from an optical disk; a laser driving circuit for supplying a laser to the optical pickup; a recording control circuit; The optical pickup includes a light emission amount detection circuit for detecting a light emission amount of a laser of the optical pickup, a signal processing circuit, and a microcomputer that receives a signal from the signal processing circuit and outputs a signal to a recording control circuit and a laser driving circuit. The microcomputer has a function of making the recording control circuit inactive while reproducing information from the optical disk. Further, the microcomputer may have a function of disabling the recording control circuit while the laser light emission amount is the reproduction light amount. Further, the microcomputer may have a function of disabling the recording control circuit when the light emission amount of the laser becomes abnormally high. Then, the microcomputer may have a function of disabling the recording control circuit when tracking starts to deviate.

[0005]

FIG. 1 is an explanatory diagram showing the configuration of a control unit of an optical disk recording / reproducing apparatus to which the present invention is applied.
An optical disk recording / reproducing apparatus, generally denoted by reference numeral 1, includes an optical disk 10 and a spindle 20 that drives the optical disk 10 to rotate. The optical disc 10 is a so-called DVD-RAM capable of not only reproducing digital data but also recording or erasing data.

The optical disk recording / reproducing apparatus 1 has an optical pickup 30, and the optical pickup 30 is connected to a laser emitting device. The objective lens 40 provided in the optical pickup 30 irradiates the laser beam LB onto the optical disk 10 to record and erase data on the optical disk and to reproduce data recorded on the optical disk 10.

The control device of the optical disk recording / reproducing device 1 is as follows.
Microcomputer 100, recording control circuit (encoder) 110
, Laser drive circuit 120, and current / voltage conversion circuit 13
0, a light emission amount detection circuit 140, and a signal processing circuit 150.

The microcomputer 100 includes a laser drive circuit 120
And outputs a laser control signal S1 to control the laser drive. Further, the microcomputer 100 outputs a control signal S2 to the recording control circuit (encoder) 110. The recording control circuit 110 outputs a recording timing signal S3 to the laser driving circuit 120 and outputs a high-frequency superposition control signal S4 to the optical pickup 30.

The amount of laser light emitted from the optical pickup 30 is detected by a light emission amount detection circuit 140 and sent to a signal processing circuit 150 as a light emission amount detection signal S5. Further, a signal detected by the optical pickup 30 from the optical disc 10 is sent to the signal processing circuit 150 via the current / voltage conversion circuit 130.

The signal processing circuit 150 processes these input signals, and sends a recording / reproduction determination signal S6, an abnormal level detection signal S7, a tracking error detection signal S8, and the like to the microcomputer 100.

The optical disk recording / reproducing apparatus is provided with the above-mentioned control device, and the recording control circuit is not operated (sleep mode) during reproduction or the like when the operation of the recording control circuit (encoder) is not necessary.
By setting the state, power consumption is reduced and a function of preventing an increase in the temperature of the apparatus is provided. Means for achieving the above-described functions are shown in FIGS.

The means shown in FIG. 2 controls the operation of the recording control circuit 110 by a control signal output from the microcomputer 100 to the recording control circuit 110. When reproducing data from the optical disk 10, the microcomputer 100 outputs a laser control signal S1 of H level to the laser drive circuit 120, for example, as shown at timing T1 in the figure, so that the laser drive circuit 120 turns on the laser. To emit light with the reproduction light amount. Further, at timing T2, the high frequency module is turned on by outputting, for example, an H level high frequency superimposition control signal S4 from the recording control circuit 110 to a high frequency module (not shown here) provided in the optical pickup 30. The recording control circuit 110 outputs, for example, an L-level recording timing signal S3 to the laser drive circuit 120. At this time, the microcomputer 100
By outputting a control signal S2 of, for example, L level to the recording control circuit 110, the recording control circuit 110 is set to the non-operation (sleep) state during the reproduction operation.

When recording or erasing data on or from the optical disk 10, as shown at a timing T3, the high-frequency module is turned off, for example, by setting the high-frequency superposition control signal S4 to the L level, and the recording timing signal S3 is set to the H level, for example. The drive circuit 120 causes the laser to emit light with a light amount higher than the reproduction light amount. At this time, the control signal S2 is set to, for example, the H level, and the recording control circuit 110 is set to the operating state during the recording or erasing operation.

When the operation is switched to the reproducing operation again at timing T4, for example, the high-frequency superimposition control signal S4 is set to H level, the high-frequency module is turned on, the recording timing signal S3 is set to L level, and the laser is emitted by the laser driving circuit 120 with the reproducing light amount. Let it. At this time, the control signal S2 is set to the L level again, and the recording control circuit 110 is brought into a non-operation state. Further, at a timing T5, the laser is turned off by outputting, for example, an L-level laser control signal S1 to the laser drive circuit 120. In this means, the recording control circuit can be set to the non-operation state during the reproducing operation.

The means shown in FIG. 3 detects the operation state of the reproducing operation or the recording operation by detecting the light emission amount of the laser, and controls the operation of the recording control circuit 110 based on the result of the judgment. is there. The level of the light emission amount detection signal S5 detected by the light emission amount detection circuit 140 changes in accordance with the light emission amount of the laser. When the light is emitted with a light amount higher than the light amount, for example, the recording level is higher than the reproduction level. Therefore, the operation state can be determined by setting, for example, a determination level between the reproduction level and the recording level, and comparing the level of the light emission amount detection signal S5 with the determination level.

As shown in the figure, when the laser control signal S1 is set to, for example, H level at the timing T1, the laser is emitted by the laser driving circuit 120 with the reproduction light amount, so that the light emission amount detection signal S5 becomes the reproduction level corresponding to the reproduction light amount. Becomes
By comparing the level of the light emission amount detection signal S5 with a predetermined determination level in the signal processing circuit 150,
During the reproducing operation, for example, a recording / reproducing determination signal S6 which becomes L level is generated. When the microcomputer 100 detects that the recording / reproduction determination signal S6 is at the L level, it recognizes that the reproducing operation is being performed, and outputs an L level control signal S2 to the recording control circuit 110, for example.
The recording control circuit 110 is set to a non-operation (sleep) state.

When the recording operation is started at timing T2, the laser drive circuit 120 causes the laser to emit light with a light amount higher than the reproduction light amount, so that the light emission amount detection signal S5 has a recording level higher than the reproduction level. Signal processing circuit 150
By comparing the level of the light emission amount detection signal S5 with a predetermined determination level, a recording / reproduction determination signal S6 that becomes H level during the recording operation is generated. When the microcomputer 100 detects that the recording / reproduction determination signal S6 is at the H level, it recognizes that the recording operation is being performed, and outputs an H-level control signal S2 to the recording control circuit 110, for example. 11
Operate 0.

When the operation is switched to the reproducing operation again at the timing T3, the laser is emitted with the reproducing light amount, so that the recording / reproducing determination signal S6 becomes L level again, and the microcomputer 100 recognizes that the reproduction is being performed. The level control signal S2 is output to the recording control circuit 110. Therefore, the recording control circuit 110 enters the non-operation (sleep) state again. Further, at timing T4, the laser control signal S1
Is set to, for example, L level, the laser is turned off by the laser drive circuit 120, and the process ends. In this means, the recording control circuit can be set to the non-operation state during the reproducing operation.

The means shown in FIG. 4 controls the operation of the recording control circuit 110 when the laser emits abnormal light. For example, when the laser emits light with an abnormally high light intensity than the light emission amount at the time of recording, for example, an emission level detection signal S5 higher than the recording level is detected. By comparing the level of the amount detection signal S5 with the abnormal level, it can be determined whether the laser emits abnormally.

As shown in the figure, when the laser control signal S1 is set to, for example, H level at the timing T1, and the laser emits light at the reproduction light amount, the light emission amount detection signal S5 becomes the reproduction level. And outputs, for example, an L-level control signal S2 to the recording control circuit 110 to put the recording control circuit 110 in a non-operation (sleep) state.

When the recording operation is started at timing T2, the laser is emitted with a higher light amount than during reproduction.
Since the light emission amount detection signal S5 has a recording level higher than the reproduction level, the microcomputer 100 recognizes that the recording operation is being performed, and outputs an H level control signal S2 to the recording control circuit 110, for example. Make it work. Here, if the amount of laser light emission becomes abnormally high during the recording operation, the level of the light emission amount detection signal S5 also increases in accordance with the light emission amount, and the signal processing circuit 150
If it is detected that the abnormal level has exceeded a preset abnormal level, an abnormal level detection signal S7 which becomes, for example, H level when the laser emits abnormally is generated. When the microcomputer 100 detects that the abnormal level detection signal S7 is at the H level, it recognizes that the laser has abnormally emitted light, sets the laser control signal S1 to, for example, the L level, turns off the laser, and sets the control signal S2, for example, to the L level. Is output to the recording control circuit 110 so that the recording control circuit 110
To a non-operation (sleep) state. In this means, the recording control circuit can be made inoperative when the laser emits abnormally.

The means shown in FIG. 5 is to control the recording control circuit 110 when tracking starts to be lost during a recording or erasing operation.
This controls the operation of. Since tracking error signal level fluctuates when tracking starts to deviate, tracking error is set by setting a deviation detection level within a range smaller than the tracking error signal amplitude, and detecting that the tracking error signal level has deviated from the detection level range. Can be determined to have come off.

During a recording or erasing operation, the recording timing signal S3 is set to, for example, an H level to cause the laser to emit light with a light amount higher than the reproduction light amount, and a control signal S3.
2 is set to, for example, H level, and the recording control circuit 110 is operated. Here, when tracking starts to deviate, the level of the tracking error signal St fluctuates, and the timing T
When it is detected by the signal processing circuit 150 in step 1 that the signal is out of the preset deviation detection level range, for example, a tracking deviation detection signal S8 which becomes H level when tracking starts to deviate is generated. When the microcomputer 100 detects that the tracking-off detection signal S8 is at the H level, the microcomputer 100 recognizes that tracking has started to be off, and outputs, for example, an L-level control signal S2 to the recording control circuit 1.
10, the recording control circuit 110 is put into a non-operation (sleep) state. At this time, the recording control circuit 11
A value of 0 causes the laser to emit light with the reproduction light amount, for example, by outputting an L-level recording timing signal S3 to the laser drive circuit 120. In this means, the recording control circuit can be brought into a non-operating state when tracking starts to deviate.

[0024]

As described above, the present invention focuses on the fact that the light emission characteristics of a laser used in an optical pickup of an optical disk recording / reproducing apparatus have temperature dependence, and the light emission characteristics are degraded by a rise in temperature. Except during recording, the recording control circuit (encoder) is deactivated and put into a sleep state. With this function, the temperature rise of the optical disk recording / reproducing apparatus is controlled, so that the life of the laser can be improved and the power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a control block diagram of an optical disk recording / reproducing apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing functions of a control block of the optical disk recording / reproducing apparatus of the present invention.

FIG. 3 is an explanatory diagram showing functions of control blocks of the optical disc recording / reproducing apparatus of the present invention.

FIG. 4 is an explanatory diagram showing functions of control blocks of the optical disc recording / reproducing device of the present invention.

FIG. 5 is an explanatory diagram showing functions of control blocks of the optical disc recording / reproducing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk recording / reproducing apparatus 10 Optical disk 20 Spindle 30 Optical pickup 40 Objective lens 100 Microcomputer 110 Recording control circuit 120 Laser drive circuit 130 Current / voltage conversion circuit 140 Light emission amount detection circuit 150 Signal processing circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D066 DA02 DA16 5D090 AA01 BB04 CC16 DD03 DD05 FF02 HH02 JJ03 KK03 5D118 AA20 BA01 BB05 BF02 BF03 CA13 CB07 5D119 AA33 AA37 BA01 DA01 DA05 EC09 FA02 HA36

Claims (4)

[Claims] 1. An optical pickup for recording and reproducing information on and from an optical disk, a laser drive circuit for supplying a laser to the optical pickup, a recording control circuit, and a light emission detection for detecting a light emission of the laser of the optical pickup. Circuit, a signal processing circuit, and a microcomputer that receives a signal from the signal processing circuit and outputs a signal to the recording control circuit and the laser driving circuit. An optical disc recording / reproducing apparatus having a function of making a recording control circuit inoperative. 2. An optical pickup for recording and reproducing information on and from an optical disk, a laser drive circuit for supplying a laser to the optical pickup, a recording control circuit, and a light emission amount detection device for detecting a light emission amount of the laser of the optical pickup. Circuit, a signal processing circuit, and a microcomputer which receives signals from the signal processing circuit and outputs signals to a recording control circuit and a laser driving circuit. An optical disk recording / reproducing apparatus having a function of disabling the optical disk. 3. An optical pickup for recording and reproducing information on and from an optical disk, a laser drive circuit for supplying a laser to the optical pickup, a recording control circuit, and a light emission amount detection device for detecting a light emission amount of the laser of the optical pickup. Circuit, a signal processing circuit, and a microcomputer that receives signals from the signal processing circuit and outputs signals to a recording control circuit and a laser driving circuit.The microcomputer records when the light emission amount of the laser becomes abnormally high. An optical disk recording / reproducing device having a function of making a control circuit inoperative. 4. An optical pickup for recording and reproducing information on and from an optical disk, a laser drive circuit for supplying a laser to the optical pickup, a recording control circuit, and a light emission amount detection device for detecting a light emission amount of the laser of the optical pickup. Circuit, a signal processing circuit, and a microcomputer that receives signals from the signal processing circuit and outputs signals to the recording control circuit and the laser drive circuit. The microcomputer does not operate the recording control circuit when tracking starts to deviate. An optical disk recording / reproducing device having a function of: