JP2002237075A - Laser diode light amount control device and optical disk device - Google Patents

Abstract

(57) [Summary] [Problem] To provide a laser diode light amount control device that can immediately perform a recording process on an optical disc even at a stage immediately before startup of light amount control feedback immediately after startup. A write power servo current converter reads a predetermined value from a storage area and supplies a drive current determined in accordance with the read value until a predetermined time ts elapses from a start by a recording operation instruction; Laser diode 12 that irradiates laser light at a predetermined wavelength
A photodetector light quantity measuring device 11 that receives the laser light and generates a current S1 corresponding to the light quantity; a difference element 24 that compares the current S1 with a reference value to generate a difference signal; Is a laser diode light quantity control device having a write power servo voltage / current converter 28 for supplying a drive current of a value determined according to the difference signal S4 to the laser diode 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser diode light amount control device, and more particularly to a device used for an optical disk device.

[0002]

2. Description of the Related Art Recently, a DVD (Digital Versatile Dis
c)-RAM (Random Access Memory), CD-R (Com
pact Disc-Recordable), CD-RW (Compact Disc-R)
2. Description of the Related Art An optical disk recording / reproducing apparatus for recording and reproducing an optical disk such as an ewritable optical disk has been experimentally manufactured and widely used. In such an optical disk recording / reproducing apparatus, information is reproduced and recorded on the signal recording layer by irradiating the signal recording layer of the optical disk with a laser beam. Such DVD-RAM, CD-R, CD-
In order to accurately control the amount of recording pulses in a recordable optical disk device such as an RW, a laser diode (Lazar Diode) control method of monitoring the amount of light and providing feedback in synchronization with the pulse emission timing is performed.

In general, in the method of monitoring and feeding back the light amount by sampling, a control delay accompanying sampling occurs, and the sampling frequency is reduced from 1/4 to 1/10 of the sampling frequency.
Only the following control bands can be obtained. The usual control of the recording light amount is mainly for the purpose of suppressing the disturbance of the operating temperature change of the laser diode and the fluctuation of the circuit power supply voltage, or the correction of the recording medium sensitivity, and can be sufficiently satisfied even in the above-mentioned band.

[0004]

However, DVD-R
Random recording system represented by AM, CD-R /
In the operation of avoiding a buffer underrun error in the RW, recording may need to be started instantaneously. At this time, there is a problem that the feedback cannot instantaneously converge to the proper recording light amount state due to the influence of the control band, and an unstable area of 10 or more sampling periods occurs before the proper recording state is obtained. .

The present invention relates to a laser diode light amount control device used for recording processing on an optical disk, for example,
It is an object of the present invention to provide a laser diode light amount control device that can immediately perform information recording processing even when light amount control feedback has not been established immediately after startup.

[0006]

SUMMARY OF THE INVENTION The present invention provides a laser diode light quantity control device for irradiating a laser beam by supplying a predetermined current of an optimum value to a laser diode. Until then, a first supply means for reading a predetermined value from the storage area and supplying a drive current determined according to the read value, and an irradiation for receiving the drive current from the first supply means and irradiating a laser beam with a predetermined wavelength Means, a generating means for receiving a laser beam irradiated by the irradiating means and generating a current corresponding to the amount of light, and a difference generating means for comparing the current generated by the generating means with a reference value to generate a difference signal And after the predetermined time has elapsed from the activation by the instruction of the recording operation, the irradiating means outputs a driving current having a value determined according to the difference signal generated by the difference generating means. It is provided with a second supply means for outputting as a laser diode light quantity control device according to claim.

As described above, the present invention provides a laser diode light amount control device that determines the magnitude of the drive current based on a value prepared in advance before the feedback is established, and performs normal servo control after the feedback is established. Thus, the recording process on the optical disk immediately after the start command can be performed stably and reliably.

According to the present invention, there is provided an optical disk device for reproducing or recording predetermined information by rotating an optical disk having a plurality of tracks at a predetermined speed and irradiating a laser beam to the signal recording layer. A rotation unit that rotates at a speed, a first supply unit that reads a predetermined value from a storage area and supplies a drive current determined according to the read value until a predetermined time elapses from the start by the instruction of the recording operation; (1) Irradiation means for receiving the driving current from the supply means and irradiating the optical disc on which the rotating means rotates with laser light at a predetermined wavelength; and receiving the laser light radiated by the irradiation means and receiving a current corresponding to the light quantity. Generating means for generating, a difference generating means for comparing a current generated by the generating means with a reference value to generate a difference signal, and activation by an instruction of the recording operation After the elapse of the predetermined time, a second supply unit that outputs a drive current having a value determined according to the difference signal generated by the difference generation unit to the irradiation unit, the first supply unit, Processing means for performing reproduction processing or recording processing of predetermined information with respect to a storage area on the optical disk by the laser light irradiated by the irradiation means based on the drive current supplied by the second supply means. This is an optical disk device characterized by the following.

As described above, according to the present invention, before the feedback is established, the magnitude of the drive current is determined by a value prepared in advance, and after the feedback is established, the optical disk using the laser diode light amount control device which performs the normal servo control is used. providing. Thus, the recording process on the optical disk immediately after the start command can be performed stably and reliably.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment> The first embodiment is a first feature of the present invention, in which a control amount prepared in a memory or the like is given before a light amount control feedback is established, thereby enabling a rapid laser diode operation. This enables light quantity control. FIG. 1 is a block diagram showing a first embodiment of a laser diode light amount control system according to the present invention, FIG. 2 is a block diagram showing one embodiment of an optical disk device using the laser diode control system according to the present invention, and FIG. Timing chart of laser diode control, FIG. 4 shows control band fb
FIG. 5 is a graph showing the relationship between the sampling frequency fs and FIG.
Is a block diagram illustrating an example of the write power corrector according to the first embodiment, and FIG. 6 is a timing chart illustrating an operation of the write power corrector according to the first embodiment.

As a first embodiment of a laser diode light amount control system according to the present invention, FIG.
The laser diode light quantity control system includes the pickup 1
02 and a laser control unit 105. The pickup 102 includes a photodetector light amount measuring device 11 and a laser diode 12, and is connected to a laser control unit 105. Laser control unit 105
Is configured in parallel with a read system used for the reproduction process and a write system provided for the recording process, and the control unit 31 performs overall control.

As a read system used in the reproduction processing of the optical disk device, a read power sample hold 13 for receiving a monitor signal S1 corresponding to the light amount from the photodetector light amount measuring device 11 and sampling and holding the monitor signal S1; And a difference calculator 14 for receiving the output of the power reference value 17 and detecting and outputting the difference. Further, an appropriate control amount is determined by the read power servo operation amplifier 15 which receives the output of the difference calculator 14, and a control signal S 2 corresponding to this is supplied to the read power servo voltage / current converter 16. In accordance with this, the read power servo voltage / current converter 16 supplies an appropriate drive current S3 to the laser diode 12, and the laser diode 12 emits a laser beam having a predetermined wavelength. This laser light is monitored by the photodetector light quantity measuring device 11 described above, and a monitor signal S1 is supplied.

On the other hand, a photodetector light amount measuring device 1 is used as a write system used in the recording process of the optical disk device.
1, a write power sample and hold 23 that receives the monitor signal S1 supplied by 1 and a difference calculator 24 that receives this output, further receives the write power reference value 27, and calculates and outputs the difference between them. . Further, an appropriate control amount is determined by a write power servo operation amplifier 25 receiving the output of the difference operation unit 24, and a control signal S4 corresponding to the control amount is supplied to a write power correction unit 26 which is a feature of the present invention. . The write power corrector 26 has a structure as shown in FIG.
The control value for determining the drive current is given by a predetermined value prepared in the memory 43 in advance without waiting for the stage where the monitor signal S1 from the photodetector light quantity measuring device 11 returns and the control signal S4 is given as feedback.
Therefore, it is possible to stably irradiate the light amount of the laser diode immediately after the activation of the laser diode 12, so that, for example, a writing process to a predetermined area of the optical disk can be performed quickly and stably. .

The control unit 31 controls the entire operation of the laser diode light quantity control system. A control signal C1 is supplied to the read power sample / hold 13 and a control signal C2 is supplied to the write power sample / hold 23.
, The control signal C5 is supplied to the write power corrector 26, the control signal C3 is supplied to the read power servo voltage / current converter 16, and the control signal C4 is supplied to the write power servo voltage / current converter 28, respectively. .

(Optical Disk Recording / Reproducing Apparatus) An example of an optical disk recording / reproducing apparatus to which the laser diode light amount control system according to the present invention is applied will be described below with reference to the drawings. In FIG. 2, the optical disc recording / reproducing device 130
An optical pickup (optical head) 102 is provided to irradiate a light beam to the storage area of the optical disk.

The optical disk D is an optical disk recording / reproducing device 1
When loaded into the optical disc D, the optical head 102 and the laser control unit 105 irradiate a laser beam, and the data is recorded in the control data zone in the emboss data zone of the lead-in area of the optical disc D using the data processing unit 106. The control information of the optical disc D is read and supplied to a CPU 125 described later.

In the optical disk recording / reproducing apparatus 130 of the present invention, the CPU 12 is controlled on the basis of operation information by a user operation, control information of the optical disk D recorded in a control data zone in the optical disk, current status, and the like.
Under the control of 5, the laser beam is generated by being energized by the laser control unit 105.

The generated laser beam is applied to the objective lens 10.
3 and irradiates the recording area of the disk. Thereby, data is written to the storage area of the optical disk D (generation of a mark sequence: data is recorded on the optical disk D by the interval between marks of variable length and the length of each mark of variable length), or The reflected wave corresponding to the stored data is reflected and detected, and the data is reproduced.

The laser control unit 105 can set each setting by the control unit 31 as described above. For the setting, for example, an erasing power for erasing data can be set in addition to a reproducing power for obtaining a reproducing signal and a recording power for recording data. The laser beam has three different levels of power, i.e., reproduction power, recording power, and erasing power, and the driving current is controlled by the voltage / current converters 16 and 28 so that laser beams of each power are generated. It is supplied to the laser diode 12.

The optical disk D faces the objective lens 103.
This optical disk D is stored directly or in the disk cartridge 101a so that the tray 10
7 transported into the apparatus. A tray motor 108 for driving the tray 107 is provided in the apparatus. Further, the loaded optical disk D is mounted on the clamper 10.
9 and is rotatably held on a spindle motor 110 by the spindle motor 110.

The optical pickup 102 includes the above-described photodetector light amount measuring device 1 for detecting a laser beam therein.
One. This photodetector detects the laser beam reflected by the optical disc D and returned via the objective lens 103.

The detected signal is supplied to a preamplifier (RF amplifier) 113 and a servo amplifier 114. From the preamplifier 113, a signal for reproducing data in the header portion and a signal for reproducing data in the recording area are output to the DVD data processing unit 106. Servo signal (track error signal, focus error signal) from servo amplifier 114
Is output to the servo seek control unit 115.

Here, as a method for optically detecting the amount of defocus, there is, for example, the following method.

[Astigmatism Method] An optical element (not shown) for generating astigmatism is arranged on a detection optical path of laser light reflected by the light reflection film layer or the light reflection recording film of the optical disk D, This is a method for detecting a change in the shape of the laser light irradiated on the detector. The light detection area is divided into four diagonally. For the detection signal obtained from each detection area, DVD
The difference between the diagonal sums is obtained in the servo seek control unit 15 to obtain a focus error detection signal (focus signal).

[Knife Edge Method] This is a method of arranging a knife edge that asymmetrically shields a part of the laser light reflected from the optical disk D. The light detection area is divided into two parts, and a difference between detection signals obtained from each detection area is obtained to obtain a focus error detection signal.

Usually, either the astigmatism method or the knife edge method is employed.

The optical disk D has a spiral or concentric track, and information is recorded on the track.
Information is reproduced or recorded / erased by tracing the converged spot along this track. In order to stably trace the focused spot along the track, it is necessary to optically detect the relative displacement between the track and the focused spot.

The following method is generally used as a track shift detecting method. [Differential Phase Detection Method]
A change in the intensity distribution of the laser light reflected by the light reflection film layer or the light reflection recording film of the optical disk D on the photodetector is detected. The light detection area is divided into four on a diagonal line. The DVD servo seek control unit 15 calculates the phase difference between the diagonal sums of the detection signals obtained from the respective detection areas to obtain a track error detection signal (tracking signal).

[Push-Pull Method] A change in the intensity distribution of the laser beam reflected by the optical disk D on the photodetector is detected. The light detection area is divided into two parts, and a difference between detection signals obtained from each detection area is obtained to obtain a track error detection signal.

[Twin-Spot Method] A diffractive element or the like is arranged in a light transmission system between the semiconductor laser element and the optical disk D to split the light into a plurality of wavefronts, and to irradiate the optical disk D with ± first-order diffracted light. The change in reflected light amount is detected. A light detection area for individually detecting the reflected light amount of the + 1st-order diffracted light and the reflected light amount of the -1st-order diffracted light is arranged separately from the light detection area for detecting the reproduction signal. Get.

In the DVD mode, a focus signal, a tracking signal, and a feed signal are sent from the DVD servo seek control unit 115 to a focus and tracking actuator driver and a feed motor driver 117, and the objective lens 103 is subjected to focus servo control by the driver 117. Further, tracking servo control is performed.

Further, the driver 11 responds to the access signal.
The urging signal is supplied from 7 to the feed motor 111 to control the transport of the optical pickup 102.

The servo seek control unit 115 includes:
Controlled by the data processing unit 106. For example, an access signal is supplied from the data processing unit 106 to the servo seek control unit 115 to generate a feed signal.

The spindle motor driver 118 and the tray motor driver 119 are controlled by a control signal from the data processing unit 106, and the spindle motor 11
0 and the tray motor 108 are energized, the spindle motor 110 is rotated at a predetermined speed, and the tray motor 108 controls the tray appropriately.

A reproduction signal corresponding to the data in the header supplied to the data processing unit 106 is supplied to a CPU (to be described later).
125. Thereby, the CPU 125
Determines the sector number as an address of the header part based on the reproduced signal, and compares it with the sector number as an address to access (record data or reproduce recorded data). .

As for the reproduction signal corresponding to the data of the recording area supplied to the data processing unit 106, necessary data is stored in the RAM 120, and the reproduction signal is processed by the data processing unit 106 and the RAM 12 as a buffer is processed.
The reproduction control signal is supplied to the interface control unit 122 having the number 1 and an external device such as a personal computer, for example.

(Operation of Laser Diode Light Amount Control System) The operation of the laser diode light amount control system corresponding to the above-described optical disk device will be described in detail below. According to the present invention, the laser control unit 105, the photodetector light amount measuring device 11 and the laser diode 12 described above with reference to FIGS. Is what you do.

That is, in the laser control unit 105 according to the present invention, immediately after the start of the recording operation, the value of the light amount monitor signal is not used immediately. Drive. FIG. 3 shows a timing chart of each signal of the laser diode light quantity control system of FIG.

In FIG. 3, the laser diode emission starts at the reproduction light amount from time t1. The recording operation starts at time t2. At this time, the write gate becomes active as a signal indicating the recording mode as a start signal. In addition,
Although not shown in FIG. 1, the write gate is used as a status signal inside the write pulse selector. The recording mode starts at time t2. In this case, when the write power corrector 26 is not used, that is, in the recording light amount control system based on the conventional sampling, the signal amplitude gradually increases during the period tw as shown by the signal S4 in FIG. It shows a response that increases and converges on the target drive voltage Vw. This is because a phase delay due to sampling occurs in principle, and control must be performed at least within a control band corresponding to at least two sampling periods. It is for this reason that the pulses P1 and P2 of the signal S6 in FIG. 3 have not reached the predetermined amplitude. Actually, as shown in FIG. 4, since the control band fb needs to be sufficiently lower than the sampling frequency fs, it is difficult to set a response speed shorter than 10 sampling periods.

Therefore, in the present invention, the write power corrector 2
6, the drive signal S5 is driven by an estimated value instead of using the signal S4 from the feedback system immediately after entering the recording mode meaning start-up. In the write power corrector 26 shown in FIG. 5, the drive voltage in the previous recording mode is sampled and held as an estimated value, and immediately after the start of the recording mode, which means activation, the previous hold value is used as a signal S5. Is shown. That is, an analog signal S4 is received from the write power servo operation amplifier 25 and converted into a digital signal.
A D converter 42 and a memory 43 to which a digital signal is supplied and which is controlled by a control signal C5-1 to the control unit 31
And a D / A converter 44 to which the output is applied and converts the digital signal into an analog signal and outputs the analog signal. Further, the switch element 45 is a write power servo operation amplifier 25.
, And the output from the D / A converter 44, and one of them is selected by the control signal C5-2.

Under the control of the control unit 31 in the write power compensator 26, the A / D converter 42
4 is stored in the memory as a digital signal in advance.
1 is written in the memory. These operations are shown in FIG.
In the timing chart showing the operation of the write power corrector according to the first embodiment, the memory value is output as a signal Vc by the D / A converter 44 when the recording mode in which the write gate rises starts, that is, when the laser diode starts. . At the start of the recording mode, the switch element 45 is connected to the B terminal to output a D / A signal. Then, after a lapse of a predetermined time ts, the terminal A of the switch element 45 is selected to shift to control of the feedback system, and the drive current S5 indicates the potential of Vw. The time ts is selected to be longer than the time tw. In the signal S5, a level difference between the estimated value (hold value at the previous recording operation) Vc and the feedback value Vw occurs at time ts, but it can be estimated at a practical level without any problem.

By the operation of the write power corrector 26, an appropriate drive current can be supplied to the laser diode 12 even before the feedback servo control of the laser diode is established. It becomes possible.

In the standby state before the start of recording, level control is performed so that the monitor sampling value has a polarity that does not drive the laser diode. In the case of an analog sampling hold, the level control is realized by, for example, providing a leak resistor so as to discharge in an appropriate direction. Digital memory hold is realized by subtracting a numerical value in an appropriate direction.

With this function, even if the switching timing between the drive and the feedback based on the estimated value is too early and the feedback is applied in an unstable state, the laser diode is erroneously driven at a high current and the improper recording on the optical disk is performed. Irradiating a considerable amount of light may destroy data,
Prevents the laser diode itself from being destroyed.
This enables a safe device from the viewpoint of data security.

<Second Embodiment> A second embodiment is a modification of the above-described write power corrector 26, which detects a driver drive voltage value of a reproduction light amount control system and, based on this, drives the laser diode immediately after the laser diode is started. The method is characterized in that the current is determined. FIG. 7 is a block diagram showing an example of the write power corrector according to the second embodiment of the laser diode light quantity control system according to the present invention.

In the write power compensator 26 of the second embodiment, the signal S2 from the read power servo operation amplifier 13 is received, converted into a digital signal by the A / D converter 42, and supplied to the memory / operation unit 47. . That is,
In the optical disc recording / reproducing apparatus, since the reproducing level always emits light even if no recording pulse is generated, the state of the laser diode is always reflected in the driving voltage of the reproducing level. If a predetermined correction operation is performed, this can be used as an estimated value. FIG. 11 shows the relationship between the write potential as the recording level and the read potential as the reproduction level.

As an operation at this time, for example, an operation of adding an offset p by multiplying the reproduction system drive voltage by a constant g is simple. g is a drive stage gain ratio between the reproducing system and the recording system, and p is a value corresponding to a laser diode voltage for compensating for the difference between the reproducing light amount and the recording light amount. Subsequent operations of the D / A converter 44, the switching element 45, and the like are the same as in the first embodiment.

That is, in the first embodiment, when the time interval between the recording modes increases, the state of the laser diode changes (temperature, wavelength, etc.) and the drive level at the end of the previous operation is the drive level at the start of the current recording. Large errors may occur with the level. In the second embodiment,
Since the recording drive level is estimated from the reproduction signal drive level, it is possible to provide an optical disk recording / reproducing apparatus capable of performing a quick writing process at the time of starting the write gate without generating such a large error. .

<Third Embodiment> In the third embodiment, a result calculated in advance by a predetermined method is used as a control value of a drive current at the time of startup. For example, the method uses a monitor signal without using a monitor signal. It is obtained from the transfer function between the driver and the laser diode (S5 to S7), that is, from the driver drive sensitivity.

That is, the write power correction value 2 shown in FIG.
In 6, the monitor signal is not used in the memory 43,
Transfer function between driver and laser diode (from S5 to S
The result obtained by calculating the drive voltage for a predetermined output light amount from 7) is stored. When the write gate is activated, this memory 4 is used only during the time ts from the start.
The control signal is directly output from the D / A converter in accordance with the transfer function of the driver and the laser diode stored in 3.

In the third embodiment, the error (step between Vc and Vw) is larger than in the first and second embodiments because the state of the laser diode is not monitored in real time. If the value is wide, the error is practically no problem, so it can be said that the method is structurally simple and convenient.

<Fourth Embodiment> In the fourth embodiment, unlike the first to third embodiments, the timing at which the light quantity feedback control is established after starting is accurately detected using a comparator, and the memory and the like are used at this timing. And the actual feedback servo is switched.

That is, in each of the above-described embodiments, the switch element 45 is switched with a specific time ts fixed. However, in the fourth embodiment, as shown in FIG. And switches accordingly. FIG. 10 is a timing chart showing the operation of the write power corrector according to the fourth embodiment. The flip-flop 48 is set by the signal C5-2 at the start of the recording mode meaning start-up, and the B terminal is selected by the switch element 45. The error between the signal S4 and the estimated value (in this case, the value of the previous signal S4 stored in the memory) is compared by the comparator 47, and when the signal S4 becomes a predetermined error from the estimated value, the flip-flop 48 is reset. Then, the terminal is switched to the A terminal by the switch element 45. In this example, this error (step between Vc and Vw) is the same, but if there is no step below the set value of the comparator 47 at the switching timing time tc, there is no step below the set value of the write power corrector. , Large steps can be prevented.

Therefore, according to the fourth embodiment, it is possible to switch between the estimated value and the feedback signal at an ideal timing. Therefore, it is possible to provide a laser diode light amount control system capable of performing a quick and stable recording operation and an optical disk apparatus using the same, as compared with the first to third embodiments.

[0056]

As described above in detail, according to the present invention, the drive current is supplied to the laser diode based on the control value prepared in advance for a predetermined time from the start of the recording mode, which means the start, thereby starting the apparatus. It is possible to provide a laser diode control light amount control device capable of irradiating an appropriate light amount even immediately after, and an optical disk recording / reproducing device equipped with the same.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a laser diode light quantity control system according to the present invention.

FIG. 2 is a block diagram showing an embodiment of an optical disk device using the laser diode control system according to the present invention.

FIG. 3 is a timing chart of laser diode control according to the present invention.

FIG. 4 is a graph showing a relationship between a control band fb and a sampling frequency fs.

FIG. 5 is a block diagram showing an example of a write power compensator according to the first embodiment of the laser diode light quantity control system according to the present invention.

FIG. 6 is a timing chart showing the operation of the write power corrector according to the first embodiment of the laser diode light amount control system according to the present invention.

FIG. 7 is a block diagram showing an example of a write power corrector according to a second embodiment of the laser diode light amount control system according to the present invention.

FIG. 8 is a block diagram showing an example of a write power compensator according to a third embodiment of the laser diode light quantity control system according to the present invention.

FIG. 9 is a block diagram showing an example of a write power corrector according to a fourth embodiment of the laser diode light amount control system according to the present invention.

FIG. 10 is a timing chart showing an operation of a write power corrector according to a fourth embodiment of the laser diode light amount control system according to the present invention.

FIG. 11 is a diagram showing a relationship between a read potential tri and a potential in the laser diode light amount control system according to the present invention.

[Explanation of symbols]

 11 photodetector light amount measuring device 12 laser diode 13 read power sample hold 14 difference calculator 15 read power servo operation amplifier 16 read power servo voltage / current converter 17 read power reference Value 23: Write power sample hold 24: Difference calculator 25: Write power servo operation amplifier 26: Write power corrector 27: Write power reference value 28: Write power servo voltage / current converter 31: Control Unit 42 A / D converter 43 Memory 44 D / A converter 45 Switch element 102 Pickup 105 Laser control unit

Claims (10)

[Claims] 1. A laser diode light quantity control device for irradiating a laser beam by supplying a predetermined current of an optimum value to a laser diode, wherein a predetermined value is stored in a storage area until a predetermined time elapses from a start by a recording operation instruction. A first supply unit for reading the read current and supplying a drive current determined in response thereto; an irradiation unit receiving the drive current from the first supply unit and irradiating a laser beam at a predetermined wavelength; Generating means for receiving the generated laser light and generating a current corresponding to the light amount; comparing the current generated by the generating means with a reference value to generate a difference signal; After the predetermined time has elapsed from the start, the second supply means for outputting a drive current having a value determined according to the difference signal generated by the difference generation means to the irradiation means. A laser diode light quantity control apparatus characterized by comprising the, the. 2. A laser diode light quantity control device for irradiating a laser beam by supplying a predetermined current of an optimum value to a laser diode, wherein a predetermined time from the start by a recording operation instruction elapses from a storage area until a predetermined time elapses. A first supply unit that reads a predetermined value corresponding to an activation state and supplies a drive current determined according to the read value; and an irradiation unit that receives the drive current from the first supply unit and irradiates a laser beam at a predetermined wavelength. A generating unit that receives the laser beam emitted by the irradiating unit and generates a current according to the amount of light; a difference generating unit that compares the current generated by the generating unit with a reference value to generate a difference signal; After the lapse of the predetermined time from the start by the instruction of the recording operation, the irradiating unit outputs a driving current having a value determined according to the difference signal generated by the difference generating unit. A laser diode light quantity control apparatus characterized by comprising a second feed means for outputting a. 3. A laser diode light quantity control device for performing recording and reproduction processing of predetermined information on a recording medium using a laser beam, wherein a reference value is used for reproducing the predetermined information stored in the recording medium. A first supply unit that supplies a drive current according to the following: a first irradiation unit that receives the drive current from the first supply unit and irradiates a laser beam at a predetermined wavelength; First generating means for generating a current in accordance with the amount of received light, and for storing the given predetermined information in a storage area of the recording medium until a predetermined time elapses from activation by a recording operation instruction. A second supply unit for supplying a drive current determined by a proportional calculation based on a current value generated by the first generation unit; and a predetermined wave receiving the drive current from the second supply unit. A second irradiating means for irradiating the laser light with the second irradiating means, a second generating means for receiving the laser light radiated by the second irradiating means and generating a current according to the amount of light, A difference generation unit that compares the difference value with the value, and after the predetermined time has elapsed from the start by the instruction of the recording operation, the difference is determined according to the difference signal generated by the difference generation unit. And a third supply unit for outputting a drive current of a value to the irradiation unit. 4. A laser diode light quantity control device that irradiates a laser beam by supplying an optimum value of a predetermined current to a laser diode, seems to be most appropriate until a predetermined time elapses from a start by a recording operation instruction. A first supply unit that reads out the ideal value obtained in advance from the storage area and supplies a drive current determined according to the ideal value, and receives the drive current from the first supply unit, and Irradiating means for irradiating laser light at a wavelength, generating means for receiving the laser light irradiated by the irradiating means and generating a current corresponding to the amount of light, comparing the current generated by the generating means with a reference value, A difference generating means for generating a difference signal, and after the predetermined time has elapsed from the activation by the instruction of the recording operation, a determination is made according to the difference signal generated by the difference generating means A laser diode light quantity control device comprising a second supply means for outputting a drive current value to the irradiation unit, that comprises a. 5. A laser diode light amount control device for irradiating a laser beam by supplying a predetermined current of an optimum value to a laser diode, wherein after starting by a recording operation instruction, a predetermined value is read from a storage area and the corresponding value is read. A first supply unit for supplying the determined drive current, an irradiation unit for receiving the drive current from the first supply unit, and irradiating a laser beam at a predetermined wavelength, and receiving the laser beam emitted by the irradiation unit. Generating means for generating a current corresponding to the light amount; difference generating means for comparing the current generated by the generating means with a reference value to generate a difference signal; A second supply unit configured to output, to the irradiation unit, a drive current having a value determined according to the difference signal generated by the difference generation unit, after the predetermined value or more. And a laser diode light amount control device. 6. An optical disk device for rotating or rotating an optical disk having a plurality of tracks at a predetermined speed and irradiating the signal recording layer with laser light to reproduce or record predetermined information, wherein the optical disk is rotated at a predetermined speed. Rotating means for performing, a first supply means for reading a predetermined value from a storage area and supplying a drive current determined according to the read value until a predetermined time elapses from the start by the instruction of the recording operation; and the first supply means An irradiating means for receiving the driving current from the optical disc and irradiating the optical disc on which the rotating means rotates with a laser beam at a predetermined wavelength; and receiving the laser light emitted from the irradiating means and generating a current corresponding to the light quantity. Means for comparing a current generated by the generating means with a reference value to generate a difference signal; and A second supply unit configured to output, to the irradiation unit, a drive current having a value determined according to the difference signal generated by the difference generation unit after a predetermined time has elapsed; Processing means for performing a reproduction process or a recording process of predetermined information on a storage area on the optical disk by the laser beam irradiated by the irradiation unit based on a drive current supplied by the supply unit. Optical disk device. 7. An optical disk apparatus for rotating or rotating an optical disk having a plurality of tracks at a predetermined speed and irradiating a laser beam to the signal recording layer to reproduce or record predetermined information, wherein the optical disk is rotated at a predetermined speed. Rotating means for performing a first operation for reading a predetermined value corresponding to the immediately preceding activation state from the storage area until a predetermined time elapses from the activation by the instruction of the recording operation; and supplying a driving current determined accordingly. Irradiating means for receiving the drive current from the first supply means and irradiating the optical disc on which the rotating means rotates with laser light at a predetermined wavelength; and Generating means for generating a corresponding current; difference generating means for comparing a current generated by the generating means with a reference value to generate a difference signal; A second supply unit configured to output, to the irradiation unit, a drive current having a value determined according to the difference signal generated by the difference generation unit after the predetermined time has elapsed from the start by the instruction; Processing means for performing, based on the drive current supplied by the supply means and the second supply means, a reproduction process or a recording process of predetermined information with respect to a storage area on the optical disc by the laser light irradiated by the irradiation means; An optical disk device comprising: 8. An optical disk apparatus for rotating or rotating an optical disk having a plurality of tracks at a predetermined speed and irradiating a laser beam to the signal recording layer to reproduce or record predetermined information, wherein the optical disk is rotated at a predetermined speed. Rotating means for performing, a first supply means for supplying a drive current according to a reference value in order to reproduce predetermined information stored in the recording medium, and receiving the drive current from the first supply means, First irradiating means for irradiating a laser beam at a predetermined wavelength to the optical disk on which a rotating means rotates; first generating means for receiving the laser light irradiated by the irradiating means and generating a current according to the light amount; In order to record the given information in the storage area of the recording medium, the first generating means operates until the given time elapses from the start by the recording operation instruction. A second supply unit that supplies a drive current determined by a proportional calculation based on a generated current value; a second irradiation unit that receives the drive current from the second supply unit and irradiates a laser beam at a predetermined wavelength; A second generating unit that receives the laser beam emitted by the second irradiating unit and generates a current corresponding to the amount of the laser beam; and compares the current generated by the second generating unit with a reference value to generate a difference signal. After the predetermined time has elapsed from the activation by the instruction of the recording operation, the difference generator outputs a drive current having a value determined according to the difference signal generated by the difference generator to the irradiation unit. A third supply unit, and a reproduction process or a recording process of predetermined information in a storage area on the optical disk by the laser beam irradiated by the irradiation unit based on a drive current supplied by the first to third supply units. An optical disk device comprising: a processing unit that performs processing. 9. An optical disk apparatus for rotating or rotating an optical disk having a plurality of tracks at a predetermined speed and irradiating a laser beam to the signal recording layer to reproduce or record predetermined information, wherein the optical disk is rotated at a predetermined speed. Until a predetermined time elapses from the activation by the recording operation instruction, the ideal value considered to be the most appropriate is obtained in advance and the stored ideal value is read out from the storage area and determined accordingly. A first supply unit that supplies a drive current, an irradiation unit that receives the drive current from the first supply unit, and irradiates the optical disc on which the rotation unit rotates with a laser beam at a predetermined wavelength; Generating means for receiving the irradiated laser light and generating a current corresponding to the amount of light; and comparing the current generated by the generating means with a reference value to generate a difference signal. After the predetermined time has elapsed from the activation by the instruction of the recording operation, the difference generator outputs a drive current having a value determined according to the difference signal generated by the difference generator to the irradiation unit. A second supply unit, and a reproduction process or a recording process of predetermined information in a storage area on the optical disc by the laser light irradiated by the irradiation unit based on the drive current supplied by the first and second supply units. An optical disk device comprising: processing means for performing the following. 10. An optical disk device for rotating or rotating an optical disk having a plurality of tracks at a predetermined speed and irradiating a laser beam to the signal recording layer to reproduce or record predetermined information, wherein the optical disk is rotated at a predetermined speed. Rotating means for performing, a start-up according to a recording operation instruction, a first supply means for reading a predetermined value from a storage area and supplying a drive current determined according to the predetermined value, and a drive current from the first supply means. Receiving means for irradiating the optical disc on which the rotating means rotates with laser light at a predetermined wavelength; generating means for receiving the laser light radiated by the irradiating means and generating a current according to the amount of light; Means for comparing a current generated by the means with a reference value to generate a difference signal; and wherein the difference signal generated by the difference generation means is equal to or greater than a predetermined value. After that, a second supply unit that outputs a drive current having a value determined according to the difference signal generated by the difference generation unit to the irradiation unit, and a drive supplied by the first and second supply units. An optical disk device, comprising: a processing unit that performs a reproduction process or a recording process of predetermined information on a storage area on the optical disk by the laser light irradiated by the irradiation unit based on the current.