JP2002298353A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device by which write output of laser light is surely set at a proper value. SOLUTION: The optical disk device 1 is provided with rotational driving mechanism on which an optical disk 2 is loaded and to rotate it with a plurality of stages of rotational speed and an optical head 3 capable of recording information by irradiating the laser light to the optical disk 2, test write is performed in the optical disk by changing output of the laser light in steps and the output of the laser light when the information is recorded in the optical disk 2 is determined. When the output of the laser light according to the rotational speed of the optical disk 2 is determined, the maximum output value of the laser light according to the rotational speed of the optical disk 2 and the minimum output value of the laser light larger than zero are first set respectively. Then, a change quantity of the output of the laser light when the output of the laser light is changed by the minimum unit is defined as a value obtained by dividing a difference value between the maximum output value of the laser light and the minimum output value of the laser light by a prescribed value and the test write is performed to the optical disk 2 based on the value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical disk device.

[0002]

2. Description of the Related Art There is known an optical disk apparatus for recording / reproducing a recordable / reproducible optical disk such as a CD-R.

This optical disk device is provided with a rotation drive mechanism for mounting an optical disk and rotating the disk at a plurality of rotational speeds (number of rotations), and movably in a radial direction with respect to the mounted optical disk. It has an optical head (optical pickup) capable of recording information (data) by irradiating a laser beam, and an optical head moving mechanism provided with a thread motor for moving the optical head in the radial direction.

The optical head includes an optical head body (optical pickup base) having a laser diode and a divided photodiode, and the optical head body is displaced (moved) in the radial direction and the optical axis direction (rotation axis direction) of the optical disk. The objective lens (condensing lens) supported by a suspension spring so as to be able to perform the operation, a focus actuator for displacing the objective lens in the optical axis direction, and a tracking actuator for displacing the objective lens in the radial direction. .

In an optical disk device having such an information recording function, before actually writing (recording) the information, an optimum recording power (writing of a laser beam) suitable for the characteristic and environmental conditions specific to the optical disk. Output).

[0006] Finding the optimum recording power is called OP.
It is called C (Optimum Power Control). In OPC, test writing is performed by changing the writing output (laser output) of a laser beam in a stepwise manner, and the laser output capable of writing most appropriately is determined (determined) as an appropriate (optimum) laser output. .

However, in the conventional optical disk apparatus, the amount of change in the output of the laser light when the write output of the laser light is changed by one step during the test writing is large.
For this reason, an appropriate laser output may not be accurately determined.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disk apparatus capable of surely setting a laser beam writing output to an appropriate value.

[0009]

This and other objects are achieved by the present invention which is defined below as (1) to (19).

(1) A rotation drive mechanism for mounting and rotating an optical disk, and an optical head capable of recording information by irradiating the optical disk with a laser beam. An optical disk device for recording / reproducing, wherein test writing is performed on the optical disk by changing the output of the laser light in a stepwise manner, and the output of the laser light when information is recorded on the optical disk is determined. The change amount of the output of the laser light when the output of the laser light is changed by the minimum unit is configured to be a value obtained by dividing a difference value between the maximum output value of the laser light and the minimum output value of the laser light by a predetermined value. An optical disk device, wherein the minimum output value of the laser beam is set to be larger than 0.

(2) The amount of change in the output of the laser light when the output of the laser light is changed by one step at the time of the test writing is the maximum output value of the laser light and the minimum output value of the laser light. The optical disk device according to the above (1), wherein the optical disk device is configured to be a value n (n is a natural number) times a value obtained by dividing the difference value of the above by a predetermined value.

(3) The amount of change in the output of the laser light when the output of the laser light is changed by one step at the time of the test writing is a maximum output value of the laser light and a minimum output value of the laser light. The optical disc device according to the above (1), which is configured to be a value obtained by dividing the difference value of the above by a predetermined value.

(4) A rotation drive mechanism for mounting an optical disk and rotating the optical disk at a plurality of rotational speeds, and an optical head capable of recording information by irradiating the optical disk with a laser beam, via the optical head An optical disc device for recording or recording / reproducing data on or from the optical disc, performing test writing on the optical disc by changing the output of the laser light in a stepwise manner, and outputting the laser light when recording information on the optical disc. Is determined, and the amount of change in the output of the laser light when the output of the laser light is changed by the minimum unit is the maximum output value of the laser light and the minimum of the laser light set according to the rotation speed of the optical disk. The minimum value of the laser light, which is set according to the rotation speed of the optical disc, is configured to be a value obtained by dividing a difference value from the output value by a predetermined value. An optical disk device, wherein at least one of a plurality of rotation speeds of a disk is set to be larger than 0.

(5) The amount of change in the output of the laser light when the output of the laser light is changed by one step at the time of the test writing is the maximum output value of the laser light and the minimum output value of the laser light. The optical disk device according to the above (4), which is configured to be a value n (n is a natural number) times a value obtained by dividing the difference value of the above by a predetermined value.

(6) The optical disk device according to (5), wherein the value of n is constant regardless of the rotation speed of the optical disk.

(7) The amount of change in the output of the laser light when the output of the laser light is changed by one step during the test writing is the maximum output value of the laser light and the minimum output value of the laser light. The optical disc device according to the above (4), which is configured to be a value obtained by dividing the difference value of the above by a predetermined value.

(8) The minimum output value of the laser beam set according to the rotation speed of the optical disk is set to 0 at the lowest rotation speed among the plurality of stages of rotation speed of the optical disk. The optical disk device according to any one of the above (4) to (7).

(9) The optical disk device according to any one of (4) to (8), wherein the maximum output value of the laser beam is set according to a rotation speed of the optical disk.

(10) The maximum output value of the laser light is:
The optical disk device according to any one of (4) to (9), wherein the lower the rotation speed of the optical disk, the lower the value.

(11) The difference value between the maximum output value of the laser light and the minimum output value of the laser light is configured to decrease as the rotation speed of the optical disk is set lower. The optical disk device according to any one of (10) to (10).

(12) The amount of change in the output of the laser beam when the output of the laser beam is changed by the minimum unit becomes smaller as the rotation speed of the optical disk is set lower. The optical disk device according to any one of (1) to (11).

(13) The maximum output value of the laser light is:
The optical disk device according to any one of (4) to (8), wherein the optical disk device is configured to be constant regardless of the rotation speed of the optical disk.

(14) The minimum output value of the laser light is:
The optical disk device according to any one of (4) to (13), wherein the lower the rotation speed of the optical disk, the lower the value.

(15) The optical disk device according to any one of (4) to (14), wherein the predetermined value is constant irrespective of the rotation speed of the optical disk.

(16) The optical disk device according to any one of (1) to (15), wherein the test writing is performed on the optical disk by changing the output of the laser light at 15 levels.

(17) The optical disk device according to any one of (1) to (16), further including an adjusting digital / analog converter for adjusting a change amount of the output of the laser beam.

(18) The optical disk device according to (17), wherein the adjustment digital / analog converter is a digital / analog converter capable of processing 8-bit data.

(19) The optical disk device according to any one of (1) to (18), wherein the test writing is performed in a test area provided on an inner peripheral side of the optical disk.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk drive according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of the optical disk apparatus of the present invention. An optical disk device 1 shown in FIG. 1 is a drive device for recording and reproducing an optical disk (CD-R, CD-RW, etc.) 2.

A spiral pre-groove (WOBBLE: not shown) is formed on the optical disk 2.

The pre-groove meanders at a predetermined cycle (22.05 kHz at 1 × speed), and the pre-groove has an ATIP (Absolute Time In Pre-Groove).
) Information (time information) is recorded. In this case, A
The TIP information is bi-phase modulated.
It is FM-modulated and recorded at a carrier frequency of 05 kHz.

The pregroove functions as a guide groove when forming pits / lands on the optical disc 2 (pit / land recording). Also, this pre-groove is played,
It is used for controlling the rotation speed of the optical disc 2 and for specifying the recording position (absolute time) on the optical disc 2.

The optical disk apparatus 1 has a rotation drive mechanism for mounting the optical disk 2 and rotating the optical disk 2 at a plurality of rotational speeds (rotations). The rotation drive mechanism mainly includes a spindle motor 11 for rotating the turntable, a driver 23 for driving the spindle motor 11, a turntable (not shown) fixed to the rotation shaft of the spindle motor 11, and the optical disk 2 mounted thereon. It is composed of

The optical disk device 1 has an optical head (optical pickup) 3 that can move in the radial direction of the optical disk 2 (radial direction of the turntable) with respect to the loaded optical disk 2 (turntable). An optical head moving mechanism for moving the head 3 in the radial direction, a control unit (CPU) 9, an RF amplifier IC 40, a servo processor (DSP) 51, a decoder 52, a memory (for example, RAM) 53, It has a laser control unit 54 and an encoder 55. Hereinafter, the optical disk 2
Is simply referred to as “radial direction”.

The optical head moving mechanism mainly includes a sled motor 7 and a driver 2 for driving the sled motor 7.
2 and a power transmission mechanism (not shown) for transmitting the rotation of the sled motor 7 at a reduced speed and converting the rotation to a linear movement of the optical head 3.

The optical head 3 includes an optical head body (optical pickup base) (not shown) having a laser diode (light source) 5 and a split photodiode (light receiving section) 6 for emitting laser light, and an objective lens (condenser lens) not shown. ). The driving of the laser diode 5 is controlled by the laser control unit 54.

The laser control unit 54 has an adjustment D / A converter (digital / analog converter) 541, and changes the output of the laser beam by the minimum unit by the adjustment D / A converter 541. The amount of change in the output of the laser light when the laser beam is turned on is adjusted.

The objective lens is supported by a not-shown suspension spring (biasing means) provided on the optical head main body, and is moved relative to the optical head main body in the radial direction and the optical axis direction of the objective lens (in the optical disk 2 (turntable)). (Rotational axis direction). Hereinafter, the optical axis direction of the objective lens is simply referred to as “optical axis direction”, and the rotation axis direction of the optical disc 2 is simply referred to as “rotation axis direction”.

The objective lens is arranged at a reference position (middle point) of the objective lens preset in the optical head body, that is, at a neutral position. Hereinafter, the reference position of the objective lens is simply referred to as “reference position”.

When the objective lens deviates from the reference position, the objective lens is urged toward the reference position by the restoring force of the suspension spring.

The optical head 3 has an actuator 4 for displacing (moving) the objective lens with respect to the optical head main body. The actuator 4 includes a tracking actuator 41 for displacing the objective lens in the radial direction and a focus actuator 42 for displacing the objective lens in the optical axis direction (rotation axis direction) with respect to the optical head body.
It is composed of

The actuator 4, that is, the tracking actuator 41 and the focus actuator 42 are each driven by the driver 21.

The control means 9 is usually constituted by a microcomputer (CPU), and comprises the optical head 3 (actuator 4, laser diode 5, etc.), thread motor 7, spindle motor 11, RF amplifier IC 40, servo processor 51, decoder 52 , The memory 53, the laser control unit 54, the encoder 55, and the like.

The control means 9 controls the OPC (Optimum
Power control), an appropriate laser beam writing output (laser output) is determined. OPC will be described later.

An external device (for example, a computer) is detachably connected to the optical disk device 1 via an interface control unit (not shown), and communication can be performed between the optical disk device 1 and the external device.

The optical disk device 1 sets the data writing speed (recording speed), that is, the rotational speed (number of rotations) of the optical disk 2 when writing data (signal) from the optical disk 2 (at the time of recording) in m steps (m). Is an integer greater than or equal to 2).

For example, the rotation speed of the optical disk 2 can be set to any one of 1 × speed (minimum speed), 2 × speed, 4 × speed, 16 × speed, and the like.

The N-times speed (N is an integer of 2 or more) means a normal speed (minimum speed) as a reference rotation speed (reference rotation speed), and refers to a rotation speed N times this reference rotation speed.

Next, the operation of the optical disk device 1 will be described. The optical disk device 1 moves the optical head 3 to a target track (target address), and performs focus control, tracking control, sled control, rotation speed control (rotation speed control), and the like on the target track. Writing (recording) information (data);
Reading (reproduction) of information (data) from the optical disk 2
And so on.

When data (signal) is recorded on the optical disk 2, a pre-groove formed on the optical disk 2 is reproduced (read), and thereafter, data is recorded along the pre-groove.

When data (signal) to be recorded on the optical disk 2 is input to the optical disk device 1 via an interface control unit (not shown), the data is input to the encoder 55.

In this encoder 55, the data is
Encoded and EFM (Eight to Fourteen Modulatio
n) is modulated (EFM) by a modulation method called
It is an ENCODE EFM signal.

This ENCODE EFM signal is 3T
It is a signal composed of pulses having a length (period) of up to 11T, and is input from the encoder 55 to the laser control unit 54.

The analog signal WRITE P
An OWER signal (voltage) is output from a D / A converter (not shown) built in the control means 9 and input to the laser control unit 54.

The laser control unit 54 has an ENCODE E
Based on the FM signal, the WRITE P
The level of the OWER signal is switched between a high level (H) and a low level (L) and output, whereby the driving of the laser diode 5 of the optical head 3 is controlled.

More specifically, the laser control unit 54
While the level of the ORDE EFM signal is high (H), the level of the WRITE POWER signal is set to high (H) and output. That is, the output of the laser is increased (write output). And ENCODE
While the level of the EFM signal is low (L), the WRI
The level of the TE POWER signal is set to a low level (L) and output. That is, the output of the laser is reduced (return to read output).

Thus, the optical disc 2 has ENCO
When the level of the RDE EFM signal is high (H), a pit of a predetermined length is written, and ENCODE EF
When the level of the M signal is low (L), a land of a predetermined length is written.

In this manner, data is written (recorded) on a predetermined track of the optical disc 2.

The recording of data on the optical disk 2 is performed sequentially from the inner circumference to the outer circumference along the pregroove.

In the encoder 55, the above-mentioned ENCODE
In addition to the E EFM signal, a predetermined ENCODE EFM signal (random EFM signal) is generated. This random EFM signal is used to determine the write output of the laser light.
In C (Optimum Power Control), it is used for laser output adjustment (power control) at the time of test writing to a test area.

The OPC will be described. CD-R (Comp
In the optical disc 2 by act Disc-Recordable, a lead-in area having ATIP special information, a PMA (Program Memory Area),
CA (Power Calibration Area) is sequentially set in this order from the outer peripheral side to the inner peripheral side. PMA,
This is an area where the start and end times of the track are written.

The PCA is further divided into a test area (Test Area) for performing test writing and a count area (Count Area) for recording the count number.

In OPC, test writing is performed in a test area. At the time of test writing in the test area, the random EFM signal is transmitted from the encoder 55 to the laser control unit 5.
4 is input. Further, the control means 9 generates a WRITE POWER signal of 15 levels (a plurality of levels), and outputs the WRITE POWER signal to the control means 9.
Is output from a D / A converter (not shown) incorporated in the controller, and is input to the laser controller 54.

Then, the laser control section 54 outputs the WRIT from the control means 9 based on the random EFM signal.
The level of the E POWER signal is switched between a high level (H) and a low level (L) and output, whereby the driving of the laser diode 5 of the optical head 3 is controlled. This is performed for each of the WRITE POWER signals of 15 levels.

In this way, the test writing to the test area is performed with the laser light having the output of 15 steps (by changing the output of the laser light step by step). This test writing can be performed a plurality of times (for example, 100 times). Trial writing 1
Each time it is performed, a flag indicating that fact is set in the count area.

In the OPC, when the shift amount between the centers of the waveforms of the 3T signal and the 11T signal in the random EFM signal is represented by β, the WRITE POWER in these 15 levels is obtained.
Out of the fifteen types of β corresponding to the signal, the output (laser output) of the laser beam corresponding to β closest to the preset predetermined value β0 (for example, 4%) is determined (determined) as an appropriate laser output. .

In this way, an appropriate laser beam writing output (laser output) is determined.
Data is written to the optical disc 2.

Here, the appropriate laser output depends on the rotation speed of the optical disk 2, and for example, the lower the rotation speed of the optical disk 2, the lower the appropriate laser output is set.

Therefore, the adjustment D of the laser control unit 54
In the / A converter 541, first, before the test writing is performed on the test area, when the rotation speed of the optical disk 2 is set, the maximum output value A of the laser beam according to the rotation speed is set to
A minimum output value B of the laser light is set according to the rotation speed, and the output of the laser light is changed by a minimum unit based on a difference value between the maximum output value A of the laser light and the minimum output value of the laser light. The change amount D of the output of the laser light when the laser beam is turned on is set.

Conceptually, the value obtained by dividing the difference between the maximum output value A of the laser light and the minimum output value B of the laser light by a predetermined value C is the laser output when the output of the laser light is changed by the minimum unit. The amount of change in light output is D. Hereinafter, the amount of change in the output of the laser light when the output of the laser light is changed by the minimum unit will be simply referred to as “the amount of change in the minimum unit”.

In the optical disk device 1, the optical disk 2
Minimum output value B of laser light set according to the rotation speed of
Is set to be larger than 0 in at least one of the rotational speeds in a plurality of stages.

However, it is preferable that the minimum output value B of the laser beam is set to 0 at the lowest rotation speed (minimum speed) of the rotation speed of the optical disk 2, for example, at 1 × speed.

In particular, it is preferable that the minimum output value B of the laser beam is set to 0 when the rotation speed of the optical disk 2 is the lowest, and to be larger than 0 at other rotation speeds.

The maximum output value A of the laser beam and the minimum output value B of the laser beam are set to lower values as the rotation speed of the optical disk 2 is set lower.

Here, the maximum output value A of the laser beam is set so that the difference between the maximum output value A of the laser beam and the minimum output value B of the laser beam becomes smaller as the rotation speed of the optical disk 2 is set lower. Preferably, the minimum output value B of the laser beam is set. That is, it is preferable that the minimum amount of change D be configured to be smaller as the rotation speed of the optical disc 2 is set lower.

As a result, at all the rotation speeds of the optical disc 2, the variation D of the minimum unit can be set sufficiently small with respect to an appropriate laser output.

In the present embodiment, the maximum output value A of the laser beam is set according to the rotation speed of the optical disk 2. However, the present invention is not limited to this.
May be configured to be constant regardless of the rotation speed.

The predetermined value C is determined by the performance of the adjusting D / A converter 541. In the present embodiment, the adjustment D / A converter 541 is configured to process 8-bit (256) data. That is, in the present embodiment, the predetermined value C is, for example, 256.

The predetermined value C is configured to be constant regardless of the rotation speed of the optical disk 2.

In the present embodiment, the adjusting D / A converter 541 is capable of processing 8-bit data. However, the present invention is not limited to this.
Or 4 bit data may be processed.

At the time of test writing in the test area, the amount of change in the output of the laser beam when it is changed by one step is n times (n is a natural number) times the amount of change D in the minimum unit. In the present embodiment, description will be made on the assumption that n = 1.

The value of n is determined, for example, when the optical disk 2 is loaded, and is constant irrespective of the rotational speed of the optical disk 2 and is constant within the same rotational speed. May not be constant.

As described above, the variation D of the minimum unit is set according to the rotation speed of the optical disk 2. This allows
At all rotation speeds of the optical disc 2, an appropriate laser output can be determined with high accuracy.

At the time of reproduction, a laser beam is emitted from the laser diode 5 of the optical head 3 onto a predetermined track of the optical disk 2. This laser light is reflected by the optical disk 2, and the reflected light is received by the split photodiode 6 of the optical head 3.

A current corresponding to the amount of received light is output from the split photodiode 6, and this current is
-V amplifier (current-voltage conversion unit) is converted to voltage,
Output from the optical head 3.

The voltage (detection signal) output from the optical head 3 is input to an RF amplifier IC 40, and the RF amplifier IC 40 performs addition, amplification, and the like to obtain an HF signal.
An (RF) signal is generated. This HF signal is an analog signal corresponding to pits and lands written on the optical disc 2.

The HF signal is input to a servo processor 51, which binarizes the HF signal,
M (Eight to Fourteen Modulation) demodulation, decoding (conversion) to data (DATA signal) of a predetermined format, and input to the decoder 52.

Then, this data is supplied to the decoder 52 by the decoder 52.
The data is decoded into data of a predetermined format for communication (transmission) and transmitted to an external device (for example, a computer) via an interface control unit (not shown).

The tracking control, sled control, focus control, and rotation speed control in the above-described reproducing operation are performed as follows.

As described above, the signal (voltage) after the current-voltage conversion from the divided photodiode 6 of the optical head 3
Is input to the RF amplifier IC 40.

The RF amplifier IC 40 receives the current-voltage converted signal from the divided photodiode 6 and
A tracking error signal (TE) (voltage) is generated.

The tracking error signal is a signal indicating the magnitude and direction of the displacement of the objective lens in the radial direction from the center of the track (the amount of displacement from the center of the track).

The tracking error signal is input to the servo processor 51. The servo processor 51 performs predetermined signal processing such as phase inversion and amplification on the tracking error signal, thereby generating a tracking servo signal (voltage). A predetermined drive voltage is applied to the tracking actuator 41 via the driver 21 based on the tracking servo signal, and the objective lens moves toward the center of the track by driving the tracking actuator 41. That is,
Tracking servo is applied.

There is a limit in driving the objective lens to follow the track only by driving the tracking actuator 41. To cover this, the sled motor 7 is driven via the driver 22 to move the optical head body to the objective lens. Moves in the same direction as the direction in which the object lens has moved, and controls the objective lens to return to the neutral position (performs thread control).

The RF amplifier IC 40 generates a focus error signal (FE) (voltage) based on the current-voltage converted signal from the divided photodiode 6.

The focus error signal indicates the magnitude of the displacement of the objective lens in the optical axis direction (rotation axis direction) from the in-focus position and the direction (in the optical axis direction (rotation axis direction) of the objective lens from the in-focus position). (Amount of deviation).

The focus error signal is input to the servo processor 51. The servo processor 51 performs predetermined signal processing such as phase inversion and amplification on the focus error signal, thereby generating a focus servo signal (voltage). A predetermined drive voltage is applied to the focus actuator 42 via the driver 21 based on the focus servo signal, and the objective lens moves toward the focus position by driving the focus actuator 42. That is, focus servo is applied.

The servo processor 51 generates a control signal (voltage) for controlling the rotation speed (rotation speed) of the spindle motor 11, that is, a control signal for setting the rotation speed of the spindle motor 11 to a target value. The data is input to the driver 23.

The driver 23 generates a drive signal (voltage) for driving the spindle motor 11 based on the control signal.

The drive signal output from the driver 23 is input to the spindle motor 11, and the spindle motor 11 is driven based on the drive signal, and the rotation speed of the spindle motor 11 becomes a target value (target rotation speed). Spindle servo is applied.

In the spindle servo described above, that is, in the rotation speed control, the target rotation speed of the spindle motor 11 is set so that the linear velocity on the optical disk 2 is constant (CLV servo (CLV: Constant Linear)).
Velocity)).

Next, the control operation of the control means 9 in determining an appropriate laser output (write output of laser light) will be described.

FIG. 2 is a flowchart showing the control operation of the control means 9 when determining an appropriate laser output according to the rotation speed of the optical disk 2. Hereinafter, description will be made based on this flowchart.

First, the optical disk 2 is mounted on the optical disk device 1, and n = 1 is set (step S101).

Next, the rotation speed of the optical disk 2 at the time of performing the test writing is set to N times speed (step S102).

Next, the adjusting D / A converter 541
The maximum output value A of the laser beam and the minimum output value B of the laser beam at N times speed are set (steps S103 and S104), and based on the maximum output value A of the laser output and the minimum output value B of the laser beam. The minimum unit change amount D is set (step S105). This minimum unit change amount D
Is a value obtained by dividing the difference value (A−B) between the maximum output value A of the laser light and the minimum output value B of the laser light by the predetermined value C, as described above.

Then, the optical disk 2 is rotated at the set rotation speed of the optical disk 2, that is, N times speed (step S106), and test writing is performed on the test area (step S107). At the time of test writing, as described above, the amount of change in the output of the laser light when the level is changed by one step is the amount of change D in the minimum unit.

Next, the information written in the test area (test writing) is read, and as described above, fifteen types of β are obtained, and the output of the laser beam corresponding to β closest to the predetermined value β0 is obtained. An appropriate laser output is determined (step S108).

As described above, according to the optical disk device 1, an appropriate laser output can be reliably determined at each rotation speed of all the optical disks 2.

As a result, it is possible to write the actual data and read the written data satisfactorily.

The optical disk device of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and each component may have any configuration having the same function. Can be replaced by

For example, the optical disk device of the present invention can be applied not only to a device capable of recording / reproducing, but also to a device dedicated to recording.

Further, the optical disk device of the present invention can be applied to various optical disk devices for recording or recording / reproducing a plurality of types of optical disks.

The optical disk device of the present invention is a device which can rotate an optical disk at a plurality of rotational speeds, but may be a device which rotates an optical disk at a single rotational speed.

[0116]

As described above, according to the optical disk apparatus of the present invention, the write output of laser light can be set to an appropriate value without fail.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an optical disk device of the present invention.

FIG. 2 is a flowchart illustrating a control operation of a control unit when determining a write output of a laser beam according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 2 Optical disk 3 Optical head 4 Actuator 41 Tracking actuator 42 Focus actuator 5 Laser diode 6 Split photodiode 7 Thread motor 9 Control means 11 Spindle motor 21-23 Driver 40 RF amplifier IC 51 Servo processor 52 Decoder 53 Memory 54 Laser control Unit 541 adjustment D / A converter 55 encoder S101 to S108 step

Continuation of the front page F term (reference) 5D090 AA01 BB03 BB04 CC01 CC14 DD01 EE02 GG21 HH01 JJ12 KK03 5D119 AA23 BB02 BB03 DA01 EC09 HA19 HA45

Claims (19)

[Claims] An optical disk for irradiating a laser beam onto the optical disk to record information; and recording or recording on the optical disk via the optical head. An optical disc device for reproducing, wherein test writing is performed on the optical disc by changing the output of the laser light in a stepwise manner, and the output of the laser light when recording information on the optical disc is determined; The amount of change in the output of the laser light when the output is changed by the minimum unit is configured to be a value obtained by dividing the difference between the maximum output value of the laser light and the minimum output value of the laser light by a predetermined value. An optical disk device, wherein the minimum output value of the laser beam is set to be larger than 0. 2. The amount of change in the output of the laser beam when the output of the laser beam is changed by one stage during the test writing is:
N (n is a natural number) obtained by dividing the difference between the maximum output value of the laser beam and the minimum output value of the laser beam by a predetermined value
2. The optical disk device according to claim 1, wherein the optical disk device is configured to have a double value. 3. The amount of change in the output of the laser light when the output of the laser light is changed by one step at the time of the test writing,
2. The optical disk device according to claim 1, wherein the optical disk device is configured to be a value obtained by dividing a difference value between a maximum output value of the laser light and a minimum output value of the laser light by a predetermined value. 4. A rotating drive mechanism for mounting an optical disk and rotating the optical disk at a plurality of rotational speeds, and an optical head capable of irradiating a laser beam onto the optical disk to record information, wherein the optical head An optical disc device for recording or recording / reproducing information on / from an optical disc, wherein test output is performed on the optical disc by changing the output of the laser light in a stepwise manner, and output of the laser light when information is recorded on the optical disc is determined. The amount of change in the output of the laser light when the output of the laser light is changed by the minimum unit is the maximum output value of the laser light, and the minimum output of the laser light set according to the rotation speed of the optical disk. A difference value between the laser light value and a predetermined value. The minimum output value of the laser light set according to the rotation speed of the optical disk is determined by the optical disk. An optical disk apparatus, wherein at least one of a plurality of rotation speeds of a disk is set to be larger than 0. 5. The amount of change in the output of the laser light when the output of the laser light is changed by one step at the time of the test writing,
N (n is a natural number) obtained by dividing the difference between the maximum output value of the laser beam and the minimum output value of the laser beam by a predetermined value
5. The optical disk device according to claim 4, wherein the optical disk device is configured to have a double value. 6. The optical disk device according to claim 5, wherein the value of n is constant irrespective of the rotation speed of the optical disk. 7. The amount of change in the output of the laser beam when the output of the laser beam is changed by one step at the time of the test writing,
The optical disc device according to claim 4, wherein the optical disc device is configured to be a value obtained by dividing a difference value between a maximum output value of the laser light and a minimum output value of the laser light by a predetermined value. 8. The minimum output value of the laser light set according to the rotation speed of the optical disk, the minimum output value of the plurality of stages of rotation speed of the optical disk being:
8. The optical disk device according to claim 4, wherein the optical disk device is configured to be set to zero. 9. The optical disc device according to claim 4, wherein a maximum output value of the laser beam is set according to a rotation speed of the optical disc. 10. The optical disk apparatus according to claim 4, wherein the maximum output value of the laser beam is set to a lower value as the rotation speed of the optical disk is set lower. . 11. A configuration in which a difference value between a maximum output value of the laser beam and a minimum output value of the laser beam becomes smaller as a rotation speed of the optical disc is set lower. An optical disc device according to any one of the above. 12. The apparatus according to claim 4, wherein an amount of change in the output of the laser beam when the output of the laser beam is changed by a minimum unit becomes smaller as the rotation speed of the optical disk is set lower. 12. The optical disk device according to any one of items 11. 13. The optical disk device according to claim 4, wherein a maximum output value of the laser beam is constant irrespective of a rotation speed of the optical disk. 14. The optical disk apparatus according to claim 4, wherein the minimum output value of the laser beam is set to a lower value as the rotation speed of the optical disk is set lower. . 15. The optical disk device according to claim 4, wherein the predetermined value is constant irrespective of the rotation speed of the optical disk. 16. The optical disc apparatus according to claim 1, wherein test writing is performed on the optical disc by changing the output of the laser light at 15 levels. 17. The optical disk device according to claim 1, further comprising an adjustment digital / analog converter for adjusting an amount of change in the output of the laser beam. 18. The optical disk device according to claim 17, wherein the adjustment digital / analog converter is a digital / analog converter capable of processing 8-bit data. 19. The optical disk apparatus according to claim 1, wherein the test writing is performed in a test area provided on an inner peripheral side of the optical disk.