JP2003067962A - Optical recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording and reproducing device that realizes the inexpensive pricing of a PU drive circuit and the stabilization of a driving voltage to temperature. SOLUTION: The optical recording and reproducing device that generates the driving voltage provided to an optical pickup recording and reproducing an optical recording medium or an optical magnetic recording medium. Then the optical recording and reproducing device is constituted of a buffer 90 outputting the driving voltage, a temperature detector 8 detecting the temperature of the device, memories 93, 94 storing setting voltage data corresponding to each mode of the device and voltage data between the input and the output of the buffer 90 to each temperature in advance, and a converter 91 DA converting the additional value of the setting voltage data and the voltage data between the input and the output of the buffer 90, where the setting voltage value of a specified mode and the voltage data between the input and the output of the buffer 90 corresponding to a temperature detected by the temperature detector 8 are provided by the memories 93, 94, to then provide it to the buffer 90.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Magneto-optical recording media (optical recording)
Optical recording and reproducing apparatus for recording and reproducing
Cost of laser pickup drive circuit
Optical voltage that stabilizes the drive voltage against power and temperature changes
The present invention relates to a recording / playback apparatus. 2. Description of the Related Art A magnetic disk is
Digital signals to magneto-optical recording media such as
Magneto-optical pickup is used as a means for recording at high density.
is there. Currently, MD is a typical example of the magneto-optical recording medium.
Hereinafter, the MD recording / reproducing apparatus will be described. FIG. 5 shows a system configuration of the MD recording / reproducing apparatus 20.
It is a block diagram showing an example. In FIG.
Is a system controller (microcomputer) that controls the whole
And 19 is a signal processing LSI circuit, which is shown in FIG.
Various circuit blocks. 2 is light
User) pickup part, 3 is RF (matrix) amplifier
4 is a high frequency superimposed on the light (laser) diode 2A
MOD drive for driving a high-frequency superposition circuit that generates signals
Bar (drive circuit), 5 is cartridge 1 of MD (1)
a to rotate the magneto-optical disk 1b stored in the
The spindle motor 6 moves the optical (laser) pickup unit 2.
A feed motor 7 for supplying current to the recording magnetic head.
Driver (drive circuit), 8 is a temperature sensor,
Reference numeral 9 denotes a recording magnetic head, and 14 denotes an anti-seismic memory. [0004] When a digital signal is recorded on the MD (1),
The analog sound supplied from the audio signal input terminal IN.
Voice signals are converted to digital data by an A / D converter (ADC).
Or read it with a playback device (not shown).
Digital signal from a CD etc.
Supplied from the terminal, and A in the signal processing LSI circuit 19.
Convert to compressed data by TRAC encoder / decoder
And the seismic memory 1 via the seismic memory controller.
4 is stored. [0005] When the storage amount of the seismic memory 14 reaches a certain amount.
After that, the compressed data from the seismic memory 14
The re-controller reads out the EFM / CIRC
EFM and Advanced CIRC (AC
IRC), and outputs this output to the magnetic head drive.
Output to the bus 7. [0006] The magnetic head driver 7 has a magnetic head for recording.
To the EFM signal data that records the direction of the current flowing through
Correspondingly, a perpendicular magnetic field (above the magnetic field) is applied to the recording magnetic head 9.
The downward direction corresponds to digital signals "1" and "0".
You. ). At the same time the laser diode 2A
The digital servo program is controlled by the microcomputer 13
A laser beam of about 5mW output through the sensor
Output to the magneto-optical disk 1b,
The magnetic film of the air disk 1b to a temperature higher than the Curie temperature.
To make the magnetization disappear. Then, the magneto-optical disk 1b is rotated and recorded.
The area to be recorded (rewritten) moves from the laser spot and
When the temperature drops below the
The part is magnetized by the magnetic field from the
Signal is recorded (magnetic field modulation overwrite method
formula). The output of the above laser beam corresponds to the ambient temperature
The MD recording / reproducing device 20
Has a temperature sensor 8. FIG. 6 shows a laser die in the photodiode section 2.
Laser diode drive circuit to drive the diode (LD) 2A
It is a block block diagram of a road. MOD driver (drive voltage
Circuit 4) is supplied to the high frequency superimposing circuit 2B.
And outputs a predetermined high-frequency signal.
Output is drive current ILC from digital servo processor
C and is supplied to the laser diode 2A.
It is good. The high-frequency superposition circuit 2B is supplied with a driving voltage (marked by
And outputs a predetermined high frequency signal. M
Drive voltage (MOD V) applied from OD driver 4
Indicates the time of recording and reproduction, for example, 2.6 V during recording, and
A different voltage is set, such as 3.3V,
During recording, the voltage lower than during playback is lower than the MOD driver drive voltage.
The high-frequency superposition circuit 2B is supplied from the
A high-frequency signal having a predetermined amplitude corresponding to the pressure is output. high frequency
The amplitude of the signal will cause variations in the performance of the laser diode element.
Consideration does not permit fluctuations, and therefore MOD driver
The output voltage of the dynamic voltage circuit 4 does not have a large allowable variation. FIG. 11 shows a conventional laser diode driving power supply.
Drive voltage circuit using two constant voltage power supplies
FIG. 3 is a block diagram of the configuration of FIG. 3.3V supply for playback
Constant voltage power supply and a variable resistor
With a constant voltage power supply that adjusts to 2.6V for recording with VR76
Two are required. During playback, switch signal PLAY terminal
Set to H level, NPN transistor Q72, PNP
Transistor Q71 is turned on, and the switch signal REC terminal is set to L level.
And turn off the NPN transistor Q75 to supply
3.3V output to the MOD voltage terminal as 3.3V
I do. During recording, the switching signal PLAY terminal is set to L level.
To turn off the NPN transistor Q72,
The REC terminal is set to the H level, and the NPN transistor Q7
5, Turn on Q73, Q74 and PNP transistor Q71 respectively
Then, the supplied 3.3 V is adjusted by the variable resistor VR76.
Then, 2.6 V is output to the output voltage terminal. Laser diode
When the mode 2A is off (when stopped), the switching signal PLAY terminal is
Set to L level to turn off NPN transistor Q72 and turn off
Set the exchange signal REC terminal to the L level and set the NPN transistor
Turn off the Q73, Q74, Q75 and PNP transistor Q71
And output 0V to the output voltage (MOD V) terminal.
You. By these operations, during reproduction, 3.1 V to 3.3 V is used.
V, 2.5 V to 2.8 V during recording, and laser
In the off state, 0 V is supplied to each of the high frequency superimposing circuits 2B. FIG. 12 shows another conventional laser diode 2A.
And a PNP transistor switch Q
81, Q82, resistors R81, R82, and semi-fixed resistors VR81, V81
It is composed of R82. During playback, the switching signal is
To the PNP transistor Q8.
1. Turn on Q82, adjust the variable resistor VR82,
The D voltage terminal is set to 3.3V. At the time of recording (recording), the switching signal is a switching signal
Only the REC supplies an L level signal, and the PNP transistor
Only the master Q81 is turned on, and the variable resistor VR81 is adjusted to
The D voltage terminal is set to 2.6V. Laser diode 2A
When the switch is off, both switching signals supply an H level signal.
The PNP transistor Q81 and the PNP transistor Q82
Both are turned off, and the MOD voltage terminal is set to 0V. Corresponding to FIG. 12, for example, the PORT shown in FIG.
Using the two terminals PO0 and PO1 as follows:
Program to be controlled in the ROM memory 9 of the microcomputer 13
3 is stored. The above description of FIG. 12 is summarized in the table below.
You. Each MOD voltage is a drive voltage circuit of the device of the present invention described later.
In the case of, use the same setting voltage. PO0 PO1 MOD voltage (switch signal REC) (switch signal PLAY) H level H level 0V (OFF) L level H level 2.6V (REC) L level L level 3.3V (PLAY) H level L level Not yet Use The circuit of FIG. 11 has two dedicated constant voltage power supplies.
Need to be prepared and the cost is considerably increased
You. Further, the circuit of FIG.
Switch to switch the recording / playback switch.
Requires two resistors, plus semi-fixed and fixed resistors
Cost increases. In addition, PNP Transis
The output voltage is controlled by the
The temperature of the stem changes. [0017] The above conventional magneto-optical recording
The reproducing device 20 superimposes a high frequency on the laser diode.
The drive circuit 4 of the high frequency superposition circuit 2A shown in FIG.
The configuration shown in the circuit diagram of FIG.
Circuit requires two constant-voltage power supplies.
It was getting up. The drive circuit of FIG.
Now, disconnect the series resistor with two PNP transistor switches
Although the output voltage is obtained instead, the PNP transistor,
Since fixed resistors and semi-fixed resistors are used, the number of parts used
Increase in cost and the drive circuit
Output voltage (MOD V) is applied to its drive circuit by PN
Because of the use of P transistors
Output voltage fluctuates. The present invention has been made in view of the above problems.
In particular, a laser diode of a magneto-optical recording / reproducing device is used.
Set the drive circuit to be driven to the set voltage value data corresponding to each mode.
Data and the input-output voltage data of the buffer unit for each temperature and
Is stored in the memory unit in advance, and the specified mode
Between the set voltage value and the temperature detected by the temperature detection unit.
The corresponding input / output voltage value of the buffer
The set voltage value and the input / output voltage supplied from the
The added value of the values is converted by the D / A conversion unit and stored in the buffer unit.
Supply, and keep the condition of the output drive voltage constant even if the temperature changes.
An object of the present invention is to provide an optical recording / reproducing device that can be secured.
You. [0019] In order to solve the above problems,
The invention described in claim 1 is an optical recording medium or
Supplied to an optical pickup that performs recording and reproduction on a magneto-optical recording medium
In the optical recording / reproducing apparatus for generating the driving voltage
A buffer unit 90 for outputting the driving voltage;
A temperature detector 8 for detecting the temperature, and a mode for each mode of the device.
The corresponding set voltage value data and the buffer
A memory section 9 for storing in advance input / output voltage value data
3, 94, the set voltage value of the designated mode and the
The buffer corresponding to the temperature detected by the temperature detection unit;
And a voltage value between input and output of the memory section is supplied from the memory section,
The added value of the set voltage value and the input / output voltage value is converted into a DA value.
And a D / A converter 91 to be supplied to the buffer unit.
Provided is an optical recording / reproducing apparatus characterized by comprising
Is what you do. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical pickup of an optical recording / reproducing apparatus according to the present invention.
Backup drive voltage circuit embodiment.
The embodiment will be described below with reference to the drawings. Optical recording of the present invention
First Embodiment of Optical Pickup Drive Voltage Circuit of Reproducing Apparatus
Will be described with reference to the drawings. The light of the first embodiment of the present invention shown in FIG.
The pickup drive voltage circuit 10 includes a D / A converter 9
1 (DA port 21) and ROM memory (data memory)
93 and a DC power supply (voltage VDD, AVREF1).
System controller (microcomputer) 13, MOD voltage terminal 2
3. NPN transistor Q11, MOD voltage terminal 23 and G
Capacitor C11 connected between ND and microcomputer 13
Temperature sensor (temperature detection unit) 8 connected and microcomputer
13 of the setting memory connected to the EEPROM (94).
Is configured. Myco in optical pickup drive voltage circuit 10
The block configuration of the microcomputer 13 is shown in FIG.
Of the voltage output type D / A converter 91 of FIG.
As shown in FIG. The configuration of the D / A converter 91 shown in FIG.
ROM 101 in the constant register (DACSO) 101
And data from the EEPROM (94). The analog power supply voltage (VDD,
AVREF1) is a DC voltage of 5V. In addition, D / A
The converter 91 has a resolution of 8 bits, from 0 to 255
It is assumed that the voltage is converted with the numerical value of Stop, re-
Each set voltage value data in raw and recording mode, for example, stop
0 V, 3.3 V in playback mode, 2.6 V in recording mode
Is stored in the ROM memory 93 or the EEPROM (9
4) can be stored in each mode.
Each set voltage value data is stored in the EEPROM (94) as follows.
And stored as an EEPROM memory table like
You. (EEPROM memory table) Mode Set voltage value Stop (OFF) mode 0 V Playback (PLAY) mode 3.3 V Recording (REC) mode 2.6 V The drive voltage circuit 10 shown in FIG.
Buffer (buffer circuit) 90
NPN transistor due to temperature change of transistor Q11
With respect to the fluctuation of the voltage Vbe between the input and output (base-emitter) of Q11
The correction method to be performed will be described below. Shown in FIG.
Optical recording / reproducing devices (systems) such as MD
The output of laser power is controlled by the disk temperature
Therefore, a temperature sensor 8 is provided. There
The NPN transistor constituting the buffer unit 90
With respect to the temperature of the voltage Vbe between the input and output (between base and emitter) of Q11
The corresponding base-emitter voltage Vbe data shown in the table below
In advance in the ROM memory 93 of the microcomputer 13, for example.
It is stored (stored) as a ROM memory table. (ROM memory table) Detected temperature -10 ° C 0 ° C 10 ° C 20 ° C Voltage Vbe 0.85V 0.8V 0.75V 0.7V Detected temperature 30 ° C 40 ° C 50 ° C 60 ° C Voltage Vbe 0.65V 6V 0.55V 0.5V The following describes the stop, reproduction, and operation of the optical recording / reproducing apparatus.
MOD voltage control shown in FIG.
Control procedure (flow chart) of the D / A converter of FIG.
This will be described with reference to the block configuration diagram. (A) When the optical recording / reproducing apparatus is stopped (STOP) In order to stop the apparatus, the laser of the optical pickup unit 2 is used.
When turning off the lighting state of the diode 2A (see FIG.
Step S21 (hereinafter referred to as S21) is Y (Yes of Yes).
Meaning), set the MOD voltage (MOD V) to 0V
The setting level of the D / A converter 91 in FIG.
EEPRO of setting memory in the register (DACSO) 101
M (94) and set the set value DACSO = 0.
(S22). This value is calculated by the D / A converter 91 as D
A conversion, 5V × 0/255 = 0V becomes D / A of FIG.
The data is converted by the converter 91 into a DA port (DA terminal).
MOD voltage (MOD V) terminal
The voltage at 23 becomes 0V. (B) The optical recording / reproducing apparatus reproduces (PLAY)
In the case of the mode, the reproduction mode (S21 in FIG. 2 is N (meaning No))
3 is Y), first, the designated recording
E in which the set voltage value data of each raw mode is stored
Read 3.3 V in the playback mode from EPROM (94)
The system temperature at that time, for example, at a temperature of 20 ° C.
The temperature is detected by the temperature sensor 8 of the device. To the detected temperature
The corresponding NPN transistor Q11 of the buffer unit 90
The input / output voltage value is stored in the ROM memory 93 in advance.
NPN tones of the buffer unit 90 corresponding to each set temperature
Input / output voltage data table for transistor Q11 (above
(See ROM memory table)
Data 0.7V (voltage Vbe at a temperature of 20 ° C.). The read voltage value of 0.7 V is designated as described above.
The recording / reproducing mode setting voltage value,
Is 3.3V + 0.7V = 4.0V in addition to 3.3V
The voltage value is stored in a setting register (DAC) of the D / A converter 91.
SO) 101, the resolution is 8 bits, and 0 to 255
Converts the DC 5V power supply voltage of the microcomputer 13 with the numerical value of
Assuming that the voltage value of 4.0 V is equal to the set value DACSO (= 255 × (3.3 + 0.7) V /
5V) = 204 is supplied to the selector 102 (S24). Setting cash register
The star (DACSO) 101 controls the selector 102,
The reference 5 V voltage is applied to the resistance ladder 1 through the selector 102.
03, weighted and added to the DA port 21
Output a DC voltage of 4.0 V (see FIG. 8). This DA
The 4.0 V of the port 21 mainly uses the NPN transistor Q11.
Between the base and the emitter in the buffer unit 90 configured as
0.7 V of the voltage Vbe is subtracted, and MO
3.3V of the target setting is output to the D drive voltage output terminal 23.
Power. Next, the temperature is changed every predetermined period (for example, one minute).
The temperature of the device was detected by the temperature sensor 8 and the temperature became high.
From the low base-emitter voltage Vbe of the NPN transistor.
Since the output voltage of the voltage terminal 23 rises by the lower part,
The output voltage of the port 21 was reduced by that much, and on the contrary, it became low temperature
Output voltage of the DA port 21 by an amount corresponding to the increase in the voltage Vbe.
Increase pressure. For this purpose, every predetermined period (for example, one minute)
A change in temperature is detected by the temperature sensor 8 (S25,
S26) If the temperature, for example, the temperature is 0 ° C.,
The input / output voltage of the buffer unit 90 corresponding to the temperature is
Input / output voltage data table in ROM memory 93
0.8 out of (see ROM memory table above)
V and read the read voltage value to the set voltage value.
In addition to 3.3V, 3.3V +
0.8 V = 4.1 V is reset, and the set value DACSO = 209 (= 255 × 4.1 V / 5
V) (S27). The setting register 101 includes a selector 102
And the reference voltage (AVREF1) 5V is applied to the D / A converter.
To the resistor ladder 103 through the selector 102 of the data 91
Is given, weighted and added, and
0.8V is subtracted, and the drive voltage is applied to the drive voltage terminal 23.
Output as 3.3V to lower 3.2V just before correction
The drive voltage was corrected by the temperature change 0.1V.
To correct the setting (target) value of the reproduction mode to 3.3 V
I can do it. Thus, the buffer section 90 is constructed.
The input-output voltage Vbe of the emitter-follower circuit
Every second (for example, for one minute).
Of the data corresponding to the detected temperature
The voltage Vbe is read, and the read voltage value is
In addition to the pressure value, reset by the setting register 101
After conversion, the DA port 21
Is set higher by the input / output voltage of the buffer unit 90.
Supply constant value. Therefore, the output of the buffer unit 90
Changes the temperature by subtracting the input-output voltage Vbe.
Even if the output voltage of the fixed output mode is
Output (S25, S26, S27, S28N (playback
The lighting state of the laser is not changed while the mode is continued))).
Finally, the reproduction mode is ended (S28Y (re-
Change the lighting state of the laser to switch from raw to another mode
)). (C) The optical recording / reproducing apparatus is a recording (REC) mode
In the case of the recording mode, the recording mode (S21 in FIG. 2 is N, S23 is N, S29 is
In the case of Y), first, the designated recording / playback
EEP storing the set voltage value data of each mode
Read 2.6V of recording mode from ROM (94)
The temperature of the system at that time, for example, a temperature of 20 ° C.
Is detected by the temperature sensor 8. Corresponds to the detected temperature
Of the buffer unit 90 that outputs the driving voltage.
The voltage between the input and output of transistor Q11 is stored in ROM memory 93.
Buffer section corresponding to each temperature stored in advance
90 input / output voltage data table of transistor Q11
Is read from the input / output voltage Vbe = 0.7V. The read voltage value of 0.7 V is designated as described above.
The recording / reproduction mode setting voltage value and the recording mode
In addition to 2.6V, 2.6V + 0.7V = 3.3V
The pressure value is set in the setting register (DACS) of the D / A converter 91.
O) For 101, the resolution is 8 bits, from 0 to 255
Converts the DC reference voltage 5V of the microcomputer 13 with
It is assumed that the voltage value of 3.3 V is set to the set value DACSO (= 255 × (2.6 + 0.7) V /
5V) = 168 (S30). This setting register 101
The selector 102 is controlled, and the reference voltage of 5 V is applied to the D / A converter.
Resistor ladder 103 through selector 102 of barter 91
To the DA port 21
Output 3.3V. 3.3V of this DA port 21
Is a buffer unit 9 composed of NPN transistors.
0, the base-emitter voltage of the buffer section 90 is
The voltage Vbe, 0.7 V, is subtracted, and the MOD drive voltage is output.
Output to the input terminal 23 as a MOD drive voltage of 2.6 V.
You. Next, the temperature is changed every predetermined period (for example, one minute).
The temperature of the device was detected by the temperature sensor 8 and the temperature became high.
From the base-emitter voltage Vbe of the transistor
Since the output voltage of the connection voltage terminal 23 rises, the DA port 2
The output voltage of 1 is reduced by that amount.
The output voltage of the DA port 21 is increased by the increase of the pressure Vbe.
To do. Therefore, the temperature change is monitored every predetermined period.
Detected by the temperature sensor 8 (S25, S26),
If the temperature is 0 ° C, for example,
The voltage between the input and output of the
Input / output voltage data table (ROM memory table
0.8V (voltage Vbe at 0 ° C)
And read the read voltage value to the set voltage value of 2.6V.
In addition, 2.6V + 0.8V
= 3.4V, and the set 3.4V is set to the set value DACSO = 173 (= 255 × 3.4V / 5
V) (S27). The setting register 101 includes a selector 102
And the reference voltage of 5 V is applied to the D / A converter 91.
Is applied to the resistance ladder 103 through the
0.8V through the buffer unit 90
The drive voltage is reduced to 2.6 V at the drive voltage terminal 23 by subtraction.
Output, and the drive was 2.5V
The dynamic voltage is corrected by the temperature change of 0.1 V, and the
To the set (target) value of 2.6V
You. Thus, the buffer section 90 is constructed.
The input-output voltage Vbe of the emitter-follower circuit
Every second (for example, for one minute).
Voltage Vbe corresponding to the temperature from the data
Read, and add the read voltage value to the set voltage value.
First, set again in the setting register 101 and perform DA conversion.
The buffer is connected to the DA port 21 which is the input of the buffer unit 90.
Supply a set value that is higher by the input / output voltage of the
I do. Therefore, the input of the buffer unit 90 is
The output voltage Vbe is subtracted, and the output is maintained even if the temperature changes.
A set voltage for a fixed recording mode is output every predetermined period
(S25, S26, S27, S28N). And last
Then, the recording mode is ended (S28Y). At the time of the first setting, the buffer unit 90
The voltage Vbe between the input and output of the NPN transistor Q31
Without specifying the mode setting voltage value of the specified recording / reproducing
In the setting register 101 of the D / A converter 91
Even if it is supplied, the drive voltage of the set
There is no problem because it is corrected. During playback and recording,
In order to obtain the required MOD voltage, the D / A
The value set in the setting register 101 of the converter 91 is
ROM memory 93 with built-in icon 13 or EEPR
It is stored in the OM (94). Transistor emitter follower buffer
Memory setting value + traffic
Figure shows the set value of the transistor base-emitter voltage Vbe
8 in the setting register 101 of the D / A converter 91
And obtain the required voltage. In this way, when stopped
Set 0 to the setting register 101 and set 0V to the DA port
Output, and at the time of recording, set values in the setting register 101.
Set 168 to output 3.3V to DA port 21
And subtract 0.7V through the buffer circuit to 2.6V
At the time of reproduction, and 204 in the setting register 101
Output 4.0V to the DA port 21
3.3V is subtracted through the road by subtracting 0.7V from the target setting.
Output as MOD voltage (MOD V)
Can be. It should be noted that each set value for reproduction and recording,
The input-output voltage value of each temperature is set in the microcomputer 13
May be stored in the ROM memory 93 which is a memory,
Using an EEPROM (94) as a memory,
When the set value is stored in the EPROM (94),
The) The optical pickup 2A of the pickup unit 2 has been changed.
Change the program of the microcomputer 13
Correction of the setting value of this EEPROM (94) without
MOD output voltage can be adjusted just by
Modification is easy and convenient. Next, the light of the magneto-optical recording / reproducing apparatus of the present invention will be described.
Block diagram of second embodiment of pickup drive voltage circuit
The configuration will be described below with reference to the drawings. Shown in FIG.
Optical pickup drive voltage circuit 3 according to second embodiment of the present invention
0 is the D / A converter (DA port 21) 91 and A /
D converter (AD port 24) 92 and DC power supply (voltage
VDD, AVREF0, AVREF1)
Roller (microcomputer) 13, drive voltage (MOD V) terminal
23, NPN transistor Q31, terminal 23 and GND
Capacitor C31 connected between AD port 24 and GN
A capacitor C32 connected between D and an EEPROM
(94). The optical pickup drive voltage circuit 30 shown in FIG.
Is the AD port 24 connected to the drive voltage terminal 23
Receives the MOD voltage of the drive voltage terminal 23, and A /
A / D conversion and read by D converter 92, designated mode
The difference between the set value corresponding to the voltage minus this read value
Find the minute value, add this difference value to the previous value and set
The converted value is DA converted by the D / A converter 91,
MOD voltage of the drive voltage terminal 23 through the DA port 21
Control and get the desired output voltage. The optical pickup driving voltage circuit 30
Is that the MOD voltage does not fluctuate even if the ambient temperature changes
Control. Change the voltage of this AD port 24 to AD
Read and control the MOD voltage of drive voltage terminal 23
The method for performing this will be described below with reference to FIGS.
You. The system of the optical pickup drive voltage circuit 30
FIG. 7 shows a block configuration of the system controller (microcomputer) 13.
Shown in Voltage output type D / A converter of microcomputer 13
FIG. 8 shows a block configuration of the A / D converter 92.
FIG. 9 shows the block configuration. D / A converter of FIG.
The setting register 101 of the converter 91 has an A / D converter
92 and data is supplied from the EEPROM (94).
You. Analog DC power supply voltage (VDD, AV
REF0 and AVREF1 power supply voltage terminals 95) are set to 5V. Ma
The D / A converter 91 and the A / D converter 92 share
The resolution is 8 bits and the voltage is a numerical value from 0 to 255
Will be described as being converted. Stopping the optical recording / reproducing apparatus of the present invention (STO)
P), playback (PLAY), and recording (REC) modes
The MOD voltage control procedure shown in FIG.
9) shows a block configuration of the A / D converter in FIG.
The description will be made with reference to the drawings. Set power in each mode
The pressure value is stored in the ROM memory 93 or the EEPROM (94).
Can be stored in the EEPROM (94).
Let it. (A) The optical recording / reproducing device is stopped (STOP)
In order to stop the device, the laser of the optical pickup unit 2
When turning off the lighting state of the diode 2A (see FIG.
Step S41 (hereinafter referred to as S41) is the place of Y
MOD), the MOD voltage (MOD V) must be 0V
However, the setting register (D
ACSO) 101 and EEPROM (94) of setting memory
And DACSO = 0 is set (S42).
This value is DA-converted by the D / A converter 91 and
× 0/255 = 0V is output from the DA port 21 in FIG.
And the voltage at the MOD voltage (MOD V) terminal 23 becomes 0V.
Become. (B) The optical recording / reproducing apparatus reproduces (PLAY)
In the case of the mode, the laser diode 2A is set to PL in order to reproduce the device.
When setting to AY power (S41 in FIG. 4 is N, S43
Is Y), the MOD voltage is set to the specified playback mode.
Must be 3.3 V for
The voltage of port 21 is connected to DA port 21 and output voltage terminal 2
3 between the NPN transistor and the buffer circuit 90.
NPN transistor is inserted because the tta follower circuit is inserted.
The base-emitter voltage Vbe of the star Q31 = 0.7V
Considering this, it is set to 3.3V + 0.7V = 4.0V. Therefore, the set value at a voltage of 3.3 V is
255 × (3.3V / 5V) = 168.
Buffer circuit 90 is inserted and the voltage is 4.0 V
Is 255 × (3.3 + 0.7) V / 5V = 2
04. Here, the buffer circuit 90 is inserted.
Therefore, the setting register 101 of the D / A converter 91
The set value DACSO = 204 is set (S44). this
In this case, the MOD voltage of the output terminal 23 becomes 3.3V.
A / D conversion result register ADCR (201) in FIG.
Supports 3.3V via AD port (terminal) 24
After a predetermined time (for example, one minute), A
It is obtained as a result of D conversion (S45, S46). The above-mentioned designation is performed every predetermined period (for example, one minute).
3.3V corresponding to the set playback mode
A voltage obtained by AD-converting the drive voltage from the set value 168
The difference value obtained by subtracting the set value 168 corresponding to the value 3.3 V is set to 0
Is detected, and the value 0 is added thereto.
The drive is reset and set as a set value 168 (S47).
The voltage is corrected by the difference value.
3.3 V, no change, and 0 correction. Here, the temperature of the surrounding system (apparatus) is
The NPN transistor which changes to constitute the buffer circuit 90
The base-emitter voltage Vbe between the input and output of the
Due to the change, the voltage from the previous 0.7V to 0.8V
When it increases, the MOD voltage of the voltage terminal 23 becomes
The voltage of the A / D converter 92 drops from 3.3 V to 3.2 V.
Of A / D conversion result register ADCR (201)
Is 255 × (3.2 V) from the set value 168 up to that point.
/ 5V) = 163. Therefore, the setting register of the D / A converter 91
The star 101 corrects the change in the AD conversion result, and
To the specified playback mode
The AD voltage of the drive voltage is converted from the corresponding set voltage value.
A value obtained by subtracting the pressure value is added, and the setting register 101 sets a value of 204+ (168-163) = 209. That
As a result, a value of 5V × (209/255) = 4.1V is output from the DA port 21 and the MOD voltage output terminal
A voltage of 4.1 V−0.8 V = 3.3 V is obtained in the element 23, and the set voltage is changed from the immediately preceding drive voltage of 3.2 V.
It is corrected to 3.3 V (during playback). On the contrary, the NPN transistor Q31
Is between 0.7V and 0.6V
If the number is reduced to
In the same way, it is possible to perform correction in accordance with the output voltage control procedure.
Can be. At the time of the first setting, the buffer unit 90
Does not consider the input-output voltage of NPN transistor Q31
In this, it is the specified mode setting voltage value of the recording / reproducing.
Is supplied to the setting register 101 of the D / A converter 91.
Even if power is supplied, the drive voltage is set to
There is no problem because it is corrected. This procedure must be amended for a specified period.
Output is constant even if the temperature changes if performed every interval, for example, every minute
Output voltage of 3.3V in MOD voltage output terminal
23 (S45, S46, S47, S
48N (The laser lighting state changes while the playback mode is
No))). And finally, end the playback mode
(S48Y (Laser point to switch from playback to another mode)
Change the lighting state)). (C) The optical recording / reproducing apparatus operates in a recording (REC) mode.
In the case of the optical disk, the laser of the optical pickup unit 2 is used to record the device.
To set the diode 2A to REC power (S4 in FIG. 4)
1 is N, S43 is N, S49 is Y), MOD voltage
Is set to 2.6 V of the determined record,
The set value in the case of 2.6 V is (2.6 V / 5 V) × 25
5 = 133, but the buffer circuit 90 is inserted.
Therefore, the set value in the case of the voltage (2.6 + 0.7) V is ((2.6 + 0.7) V / 5V) × 255 = 168 (S50). In this recording mode, the playback
Only when the set voltage value differs from the mode
If the same procedure as in the mode is corrected at predetermined intervals (S
45, S46, S47, S48N), ambient temperature changes
Even if the output voltage is set to 2.6V in the constant output recording mode,
D voltage can be obtained. And finally the recording mode
Is ended (S48Y). It is to be noted that M necessary for reproduction and recording
In order to obtain the OD voltage, the D / A converter 91 of FIG.
The value set in the setting register 101 is stored in the microcomputer 13
ROM memory 93 or EEPROM (94)
Remember it. In the embodiment of FIG.
For example, the PORT 12 of the microcomputer 13 shown in FIG.
EPROM (94) is connected. Buffer of transistor emitter follower
When the memory circuit 90 is connected, the memory setting value +
Set value of transistor base-emitter voltage Vbe
Into the setting register 101 of the D / A converter 91 in FIG.
Set to get the required voltage. As described above, at the time of stop, 0 is set to 101.
Output 0V to the DA port and set at the time of recording
3.3V is set to D by setting the set value 168 in the register 101.
A is output to the A port 21 and 0.7
2.6 V by subtracting V, and setting register at the time of reproduction
Set the setting value 204 to 101 and apply 4.0 V to the DA port
21 and subtract 0.7V through the buffer circuit
Then, 3.3 V is set to the target setting MOD voltage (MO
DV). In the present invention, the NPN transistor Q31 is provided.
Transistor emitter / follower circuit emitter
Connect the connected output voltage terminal 23 to the AD port 24 (A / D
It is connected to the input terminal AN10) of the converter 92. this
By connection, the input terminal AN10 (A
The A / D converter shown in FIG. 9 is obtained by AD converting the voltage of the D port 24).
ADCR of the AD conversion result register of the inverter 92 (20
Read the value of 1) and set the memory value.
This AD conversion is performed from the set value 133 corresponding to 2.6 V.
The value obtained by subtracting the value is added and the setting level of the D / A converter 91 is set.
The setting value is reset by the register 101 and depends on the fluctuation of the ambient temperature.
Constant MOD voltage that does not exist, 2.6 V for recording
Can be obtained by correcting Each set voltage value for stop, reproduction, recording, etc.
Is stored in the ROM memory 93 of the setting memory in the microcomputer 13.
It may be stored, but the EEPROM (9
Using 4), the set value is stored in this EEPROM (94).
When memorizing, when the optical pickup 2A is changed
Even without changing the microcomputer program, this setting
Adjusting the MOD output voltage by simply correcting the value
Can be done. The optical pickup of the first embodiment
The buffer circuit (buffer unit) 90 of the drive voltage circuit includes N
Although it is configured using the PN transistor Q11, it is not limited to this.
It is not specified, as shown in FIG.
(Q91) can also be used. The optical pickup driving voltage circuit of FIG.
The buffer unit 90 of the DA port 2 is a DA port 2 of the microcomputer 13.
1 is connected to the gate (G) of the MOS-FET (Q91),
5V voltage terminal is connected to the drain (D), MOS ・ FE
Connect the source (S) of T (Q91) to MOD voltage terminal 23
It is composed. For each temperature of the buffer unit 90
The input / output voltage data is transferred from the transistor to the MOS / FE
It should be stored in ROM memory 93 instead of T
Other configurations are the same as those of the first embodiment. As described above, according to the present invention,
Light for recording / reproducing on an optical or magneto-optical recording medium
The drive voltage supplied to the pickup is controlled by the system
Optical recording / reproducing device generated using the power supply of the
A buffer unit for outputting the drive voltage;
A temperature detecting section for detecting a temperature;
Input and output of the buffer unit for each set voltage value and each temperature
A memory unit for storing inter-voltage value data in advance, and
The set voltage value of the set mode and the temperature detection unit
The input / output power of the buffer unit corresponding to the detected temperature
Pressure value is supplied from the memory unit, and the set voltage value and
DA conversion of the sum of the input-output voltage values and the buffer
And a D / A conversion unit for supplying the
A constant drive voltage can be obtained even when the temperature changes. Also book
According to the invention, a dedicated constant voltage power supply can be eliminated,
The cost of the device can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a block configuration of a first embodiment of an optical pickup drive voltage circuit of an optical recording / reproducing apparatus according to the present invention. FIG. 2 is a flowchart showing a MOD voltage control procedure for controlling the MOD voltage of the first embodiment of the optical pickup drive voltage circuit of the optical recording / reproducing apparatus of the present invention to be constant. FIG. 3 is a diagram showing a block configuration of a second embodiment of an optical pickup drive voltage circuit of the optical recording / reproducing apparatus of the present invention. FIG. 4 is a flowchart showing a MOD voltage control procedure for controlling the MOD voltage of the optical pickup drive voltage circuit of the optical recording / reproducing apparatus of the present invention to be constant. FIG. 5 is a block diagram illustrating a system configuration example of an MD recording / reproducing apparatus. FIG. 6 is a diagram showing an example of a block configuration of a laser diode drive voltage circuit in the pickup. FIG. 7 is a diagram showing a block configuration of a system controller (microcomputer) used in the present invention. FIG. 8 shows a system controller D used in the present invention.
FIG. 3 is a diagram showing a block configuration of an / A converter. FIG. 9 shows A of a system controller used in the present invention.
FIG. 3 is a diagram illustrating a block configuration of a / D converter. FIG. 10 is a diagram illustrating a MOS • FET using the optical pickup driving voltage circuit of the first embodiment of the optical pickup driving voltage circuit of the optical recording / reproducing apparatus of the present invention as a buffer unit (buffer circuit)
FIG. 4 shows a block diagram configured using the above. FIG. 11 is a diagram showing an example of an optical pickup drive voltage circuit used in a conventional optical recording / reproducing apparatus. FIG. 12 is a diagram showing another example of an optical pickup drive voltage circuit used in a conventional optical recording / reproducing apparatus. [Description of Signs] 1 MD (mini disk) 1a Cartridge 1b Magneto-optical disk (optical recording medium) 2 Optical (laser) pickup unit 2A Optical (laser) diode 2B High frequency superposition (MOD) circuit 3 RF matrix amplifier 4 MOD driver ( Optical pickup drive voltage circuit) 5 Spindle motor 6 Feed motor 7 Magnetic head drive circuit 8 Temperature sensor (temperature detection unit) 9 Recording magnetic head 10, 50 Optical pickup drive voltage circuit 13 of first embodiment 13 System controller (microcomputer) 14 Seismic Memory 19 Signal Processing LSI Circuit 20 MD Recording / Reproducing Device 21 DA Port (DA Terminal) 23 MOD Driving Voltage Output Terminal 24 AD Port (AD Terminal) 30 Optical Pickup Driving Voltage Circuit 90 of Second Embodiment Buffer Unit ( Buffer circuit) 91 D / A converter (D / A converter) 92 A / D converter (A / D converter) 93 ROM memory (memory) 94 EEPROM (setting memory, memory) 95 Analog power supply voltage terminals (AVREF0, AVREF1) 101 Setting register ( DACSO) 102 Selector 103 Resistance ladder 201 A / D conversion result register (ADCR) AVREF0, AVREF1, VDD DC power supply voltage of microcomputer (5V) C11, C31, C32, C41, C71, C72, C81, C91, C
92 Capacitor ILCC Laser diode drive current MOD V Drive voltage Q11, Q31 NPN transistor (buffer) Q71, Q81, Q82 PNP transistor Q72-Q75 NPN transistor Q91 MOS-FET (buffer) R, R71-R77, R81, R82 Resistance Vbe Transistor base-emitter voltage VR76, VR81, VR82 Variable resistor

Continuation of front page    F term (reference) 5D090 AA01 BB10 CC01 CC04 DD03                       EE01 EE11 FF10 HH01 JJ07                       KK03                 5D119 AA06 AA23 AA40 BA01 BB05                       DA01 DA05 HA28 HA30 HA44                       HA68                 5D789 AA06 AA23 AA40 BA01 BB05                       DA01 DA05 HA28 HA30 HA44                       HA68

Claims (1)

1. An optical recording / reproducing apparatus for generating a driving voltage to be supplied to an optical pickup for recording / reproducing an optical recording medium or a magneto-optical recording medium, comprising: a buffer unit for outputting the driving voltage; A temperature detection unit that detects the temperature of the device; a memory unit that previously stores set voltage value data corresponding to each mode of the device and input / output voltage value data of the buffer unit for each temperature; The set voltage value of the set mode and the input / output voltage value of the buffer unit corresponding to the temperature detected by the temperature detection unit are supplied from the memory unit, and the set voltage value and the input / output voltage value An optical recording / reproducing apparatus, comprising: a D / A converter for DA-converting the sum of the signals and supplying the result to the buffer.