JPH0757289A - Optical disk device - Google Patents

Abstract

PURPOSE:To suppress the occurrence of an error even when an optical disk is used under an environment where a great deal of dust, dirt and smoke, etc., of a cigarette exist. CONSTITUTION:A hermetically sealed and housed optical power sensor is incorporated in a sensor housing part 31, and the intensity of a laser beam on a medium surface is made measurable, and a reproducing waveform decision circuit 6 deciding the size of a regenerative signal is provided. Then, when no size of the regenerative signal exists within a range of the prescribed size, the optical power sensor 22 is introduced to a laser beam irradiation position on an optical disk surface, and the intensity of the laser beam is measured. When the intensity of the laser beam is out of a prescribed power setting value, the intensity of the laser beam is adjusted to the same value as the power setting value, and when the power consumption becomes larger than the prescribed maximum value of the power consumption of a laser light source, a warning is issued, and the adjustment is performed so as to hardly become larger than the maximum value of the power consumption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device such as a magneto-optical disk device for recording and reproducing by using laser light.

In recent years, the performance of computer systems has been improved, and the processing speed and processing capacity have been remarkably improved. Along with this, improvement in the performance of external storage devices has been desired, and in particular, optical disk devices have been in the limelight. .

In the above optical disk device, about 1 μm
By irradiating the optical disc with the laser light of, the recording and reproducing in micron order are possible. Therefore, when the optical disc is compared with a magnetic disc or the like, the recording density can be made very high.

Recently, an inexpensive optical disk device that can be easily connected to a personal computer, an OA device, etc. has been developed, and the optical disk device has begun to be used in various fields.

[0005]

2. Description of the Related Art Conventionally, a magneto-optical disk device has been known as an optical disk device capable of recording and reproducing.

In such a magneto-optical disc device (hereinafter, simply referred to as "optical disc device"), the optical head is moved in a radial direction of the optical disc by a moving mechanism equipped with the optical head with respect to the optical disc which is rotationally driven by a motor. It is positioned on a desired track and recording / reproducing is performed on an optical disk (medium).

On the other hand, in the optical head, the emitted light of a semiconductor laser (for example, a laser diode) which is a laser light source is narrowed down through an optical system (lens, mirror, beam splitter, etc.), and this laser light (laser beam) is applied to an optical disk. Then, the data is recorded and reproduced.

[0008]

SUMMARY OF THE INVENTION The above-mentioned conventional devices have the following problems. : Optical discs are recorded and reproduced using laser light. Therefore, if dust, dirt, etc. adhere to the optical system through which the laser light passes, the laser power apparently decreases, and normal recording and reproduction become difficult.

[0009]: Especially in a general office,
A lot of dust, cigarette smoke, etc. are present, and when the optical disc is used in such an environment, an error easily occurs. SUMMARY OF THE INVENTION It is an object of the present invention to solve such conventional problems and to suppress the occurrence of an error even when an optical disc is used in an environment in which a lot of dust, dust, cigarette smoke, etc. are present. And

[0010]

FIG. 1 is a diagram for explaining the principle of the present invention. In FIG. 1, 1 is an optical disk device, 4 is a control unit,
5 is a read / write circuit (R / W circuit), 6 is a reproduced waveform determination circuit, 11 is a servo control unit, 12 is a light amount control unit, 1
5 is an optical head, 18 is a spindle motor, 21 is an optical disk (medium), 22 is an optical power sensor, 25 is an optical power sensor controller, 26 is an optical power sensor introducing mechanism, 31
Indicates a sensor housing.

In order to solve the above problems, the present invention has the following configuration. : An optical head 15 for irradiating the optical disc 21 with a laser beam and receiving the reflected light to obtain a received light signal; and a light amount control section 1 for controlling the intensity of the laser beam radiating on the optical disc 21.
2 is provided, and by the laser light irradiation from the optical head 15,
In the optical disc device that records and reproduces data on the optical disc 21, the optical head 15 drives the optical disc 2
An optical disc device which has a built-in optical power sensor 22 for measuring the intensity of laser light applied to the optical disc 1, and is capable of measuring the intensity of laser light on the optical disc surface (medium surface).

In the configuration, the optical power sensor 22
An optical power sensor introducing mechanism for pulling out the optical power sensor from the sensor housing 31 and introducing the optical power sensor to the laser beam irradiation position on the optical disk surface when the optical power sensor 22 and the sensor housing 31 that hermetically seals the optical disk are used. An optical disk device provided with 26.

In the configuration, a reproduction waveform judgment circuit 6 for judging the size of the reproduction signal reproduced from the optical disk 21 is provided, and as a result of the judgment by the reproduction waveform judgment circuit 6, the reproduction signal size is a preset value. An optical disk device that introduces the optical power sensor 22 at the laser light irradiation position on the optical disk surface to measure the intensity of the laser light when it is not within the range.

In the configuration, the optical power sensor 22
When measuring the intensity of the laser beam, the optical disc 21
An optical disk device for measuring the intensity of laser light at the time of recording, reproducing, and erasing.

In the configuration, the optical power sensor 22
When the intensity of the laser light is out of the preset power setting value as a result of the measurement by
2. An optical disk device for adjusting the intensity of laser light to the same value as the power setting value by 2.

In the configuration, when adjusting the intensity of the laser beam, if the preset power consumption of the laser light source exceeds the maximum value, a warning is issued so that the power consumption does not exceed the maximum value. Optical disk device to adjust.

[0017]

The operation of the present invention based on the above configuration will be described with reference to FIG. When the optical disc 21 (medium) is inserted into the optical disc device 1, first, data is sent from the read / write circuit 5 to the optical head 15 to record the data on the optical disc 21.

Next, the data recorded on the optical disk 21 is reproduced, and the reproduced waveform judgment circuit 6 checks the amplitude of the reproduced signal. By this check, it is confirmed that the value is within the range of the preset size. Also, it is confirmed that the signal is within the above range even when the signal is reproduced normally after recording.

When the magnitude of the reproduced signal is not within the above range (the magnitude of the reproduced signal is outside the upper and lower threshold ranges), the optical power sensor introducing mechanism 26 is driven to drive the optical power sensor 22. Then, the intensity of the laser beam is measured by introducing it to the laser beam irradiation position on the optical disc surface.

In this case, the light quantity control unit 12 controls the light quantity of the laser light source provided in the optical head 15 to measure light emission with each power of write, read and erase. Further, the sensor monitor value measured by the optical power sensor 22 is sent from the optical power sensor control unit 25 to the control unit 4, and the sensor monitor value is compared with a preset power set value in the control unit 4. To do.

As a result, when the measured intensity of the laser beam is out of the preset power setting value, the intensity control unit 12 sets the intensity of the laser beam to the same value as the power setting value. Adjust to.

Further, when adjusting the intensity of the laser light to the power setting value, if the power consumption of the laser light source exceeds a preset maximum value, a warning is issued to the host device and the power consumption Adjust so that it does not exceed the maximum value.

By adjusting the intensity of the laser light as described above, it is possible to prevent errors during read / write. In this case, the optical power sensor 22 is built in the sensor housing 31 in a hermetically sealed state, and is introduced to the optical disk surface only when in use. Therefore, the optical power sensor itself is dust, dust, dust, or tobacco smoke. It will not be contaminated by such things.

At the time of the measurement, the optical power sensor 2
Since No. 2 is introduced at the laser irradiation position on the optical disk surface, apparent power down due to dust, dust, dust, cigarette smoke, etc. adhering to the optical system from the laser light source to the laser irradiation position on the optical disk surface, Since it is taken into consideration, highly accurate correction is possible.

Furthermore, by not increasing the power consumption of the laser set in advance, it is possible to prevent deterioration (shortening of the life) of the laser light source (for example, diode).

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 2 to 11 are views showing an embodiment of the present invention. In FIGS. 2 to 11, the same parts as those in FIG. 1 are designated by the same reference numerals.

Reference numeral 2 is a host (host computer), 3 is a controller, 7 is a bias magnet controller, and 8
Is a sensor drive motor control unit, 9 is a sensor control unit, 10 is an eject motor control unit, 13 is a sensor drive motor, 1
4 is an eject motor, 16 is a bias magnet, 19 is a spindle motor control unit, 23 is a stopper, 24 is an eject arm, 27 is a comparing unit, 28 is a comparing and correcting unit, 29 is a ROM (for storing power setting values), and 30 is Spindle, 3
2 is a guide tube, 33 is a stopper drive arm, 34
Is a feed mechanism, 35 is a window (made of rubber), 36 is a sensor drive arm, 37 is RAM (for storing comparative values), 38 is a flag part, 39 is a diagnostic flag, 40 is a warning flag, 42 is an objective lens, 43, 44 is a beam splitter, 45 is a mirror, 46 is a semiconductor laser, 47 is a collimating lens, 4
8 is a split detector for magneto-optical disk, 49 is a Wollaston prism, 50 is a split detector for tracking servo, 51 is a split detector for focus servo, and 52 is a split detector.
Indicates a fixed optical system of the optical head.

§1: Description of Configuration of Optical Disk Device--See FIG. 2 FIG. 2 is a block diagram of the optical disk device. As shown in the figure, the optical disc device 1 includes a controller 3, a controller 4, a read / write circuit (R / W circuit) 5, a reproduction waveform determination circuit 6, a bias magnet controller 7, a sensor drive motor controller 8, and a sensor. Control unit 9, eject motor control unit 1
0, servo control unit 11, light amount control unit 12, sensor drive motor 13, eject motor 14, optical head 15, bias magnet 16, spindle motor 18, spindle motor control unit 19, optical power sensor 22, stopper 23,
An eject arm 24 and the like are provided.

This optical disk apparatus 1 is a host (HOS
T) 2 is used by connecting it, and data is read from and written to the optical disk 21 by using the optical head 15 by access from the host 2. Functions and the like of the above-mentioned respective parts are as follows.

(1): The controller 3 exchanges commands with the host 2 (host interface control)
And performing various controls inside the optical disk device (upper controller).

(2): The control unit 4 exchanges commands with the controller 3, the bias magnet control unit 7, the sensor drive motor control unit 8, the sensor control unit 9, the eject motor control unit 10, and the servo control. Section 11, light quantity control section 12
Etc. are controlled.

(3): Read / write circuit (R / W circuit)
5 is an optical disk 21 according to an instruction from the controller.
Data read / write processing for (medium) is performed.

(4): The reproduction waveform judgment circuit 6 compares the reproduction signal reproduced from the optical disk (medium) with a preset comparison value. (5): The bias magnet control unit 7 controls the bias magnet 16 when writing data to the medium.

(6): The sensor drive motor control section 8 controls the sensor drive motor 13. (7): The sensor control unit 9 controls the optical power sensor 22 when measuring the laser light. When measuring the laser light, the sensor control unit 9 detects the output signal of the optical power sensor 22 and sends the detected value to the control unit 4 as a sensor monitor value.

(8): The eject motor control section 10 controls the eject motor 14 for ejecting (discharging) the optical disk 21 according to an instruction from the control section 4.

(9): The servo control section 11 performs drive control (servo control) of the optical head 15 according to an instruction from the control section 4. (10): The light quantity control unit 12 controls the light quantity (for example, the current control of the laser diode) with respect to the light source (for example, the laser diode) in the optical head 15 according to the instruction of the control unit 4.
Is to do.

(11): The sensor drive motor 13 drives the optical power sensor 22. (12): The eject motor 14 is a motor for ejecting (discharging) the optical disk 21.

(13): The optical head 15 has a laser light source (for example, a laser diode) inside, and the optical disk 2
Data is read, written, erased, and the like for the data of 1.

(14): The bias magnet 16 is the optical disc 2
It is used when writing and erasing data in 1. (15): The spindle motor 18 is a motor for rotating the optical disc 21.

(16): The spindle motor controller 19 controls the rotation of the spindle motor 18. (17): The optical power sensor 22 is a sensor that is inserted into the laser irradiation position on the optical disc surface to measure the intensity of the laser light.

(18): The stopper 23 is a mechanism for preventing the insertion of the optical disk 21. (19): The eject arm 24 is a mechanism for ejecting (discharging) the optical disk 21.

The optical power sensor control unit 2 of FIG. 1 is controlled by the sensor drive motor control unit 8, the sensor control unit 9 and the like.
Make up 5. §2: Detailed explanation of reproduced waveform judgment circuit and control unit ...
-Refer to FIG. 3 FIG. 3 is a partial detailed view of FIG. 2, where A is a block diagram of the reproduced waveform determination circuit and B is a block diagram of the control unit. Less than,
The reproduced waveform determination circuit and the control unit will be described in more detail with reference to FIG.

RAM 37 is included in the reproduced waveform determination circuit 6.
And a comparison unit 27 is provided. The RAM 37 is a memory for setting a comparison value (upper limit value and lower limit value of reproduction signal amplitude), and the comparison value is transferred from a higher-level device and stored in the RAM 37 when the device is started up, for example. To do.

As the comparison value, the data held in the host 2 or the controller 3 is transferred to the RA via the control unit 4.
It may be transferred to M37 or may be input from an input device on the host side.

The comparison unit 27 compares the comparison value of the RAM 37 with the reproduction signal reproduced from the optical disk 21 (comparison of magnitude), and turns on a diagnostic flag (described later) based on the comparison result. To output to the control unit 4.

The control section 4 is provided with a ROM 29, a comparison correction section 28, and a flag section 38. ROM2
Reference numeral 9 is a non-volatile memory in which power setting values (power setting values for reading, writing, and erasing) are set in advance. The flag unit 38 includes a diagnostic flag 39 and a warning flag 4.
0 is set.

In this case, the diagnostic flag 39 is a flag (ON / OFF setting) set by the control unit 4 by the signal from the comparison unit 27 of the reproduction waveform judgment circuit 6, and the warning flag 4
0 is the control unit 4 based on the signal from the comparison and correction unit 28.
Is a flag (ON / OFF setting) set by

Further, the comparison / correction unit 28 includes a sensor control unit 9
In order to adjust the intensity of the laser beam to the light quantity control unit 12 by comparing the sensor monitor value (the intensity of the laser beam) sent from the optical power sensor 22 via the power set value of the ROM 29. Is output (power indication value of laser diode).

In this case, when the sensor monitor value (the intensity of the laser beam) is out of the preset power setting values of read, write and erase, the light quantity control section 1 is used.
For 2, the light intensity adjustment instruction is issued to adjust the intensity of the laser light to the same value as the power setting value.

When the intensity of the laser light is adjusted, if the power consumption of the laser light source is greater than the preset maximum value, the control unit 4 causes the warning flag based on the signal from the comparison and correction unit 28. Set 40 on. The maximum value of the power consumption of the laser light source is stored in advance in the ROM 29, for example.

Then, the control unit 4 reports to the controller 3 that the warning flag 40 is turned on, and adjusts the light amount of the laser light source so as not to exceed the maximum value of the power consumption. Give instructions.

§3: Explanation of optical power sensor introduction mechanism
-Refer to FIG. 4 and FIG. 5 FIG. 4 is an explanatory view of the optical power sensor introduction mechanism, where A is a plan view in a state where the optical power sensor is not introduced, and B is A.
Is a side view of C, a plan view of a state in which an optical power sensor is introduced, and D is a side view of C. Further, FIG. 5 is an explanatory view of the sensor storage portion, A is a sectional view of the sensor storage portion, and B is a front view of the sensor storage portion. Hereinafter, the optical power sensor introducing mechanism 26 (see FIG. 1) will be described in detail.

The optical power sensor introduction mechanism is composed of the sensor drive motor 13, the feed mechanism 34, the guide tube 32, the stopper drive arm 33 and the like. The feed mechanism 34 is a mechanism that is driven by the sensor drive motor 13 and moves the stopper drive arm 33 and the sensor drive arm 36, and is configured by, for example, a rack and a pinion.

The stopper drive arm 33 and the sensor drive arm 36 are integrated, and when the stopper drive arm 33 is driven, the sensor drive arm 36 is simultaneously driven in the same direction. The optical power sensor 22 is fixed to the tip of the sensor drive arm 36, and the movement of the sensor drive arm 36 causes the optical power sensor 2 to move.
2 is introduced on the optical disk surface.

The optical power sensor 22 is normally (when not in use) housed in the sensor housing 31 in a hermetically sealed state so that dust, dust, cigarette smoke, etc. do not enter from the outside.

From the sensor housing 31 to the optical power sensor 22
The rubber window 3 is divided into two parts from the center.
When the optical power sensor 22 is attached to the optical disc surface, the rubber window 35 is pushed out to come out.

When the optical power sensor 22 is introduced on the optical disk surface, the controller 4 issues a motor rotation instruction to the sensor drive motor 13, and the sensor drive motor 13 is
The stopper drive arm 33 is moved in the arrow direction of FIG. 4C.

When the stopper drive arm 33 moves in the direction of the arrow shown in the drawing (to the left in the drawing), the stopper 23 rotates in the direction of the arrow shown in FIG. 4D and is pushed up. In this state,
The optical disk 21 cannot be inserted.

Further, since the stopper drive arm 33 is interlocked with the optical power sensor 22 via the sensor drive arm 36, the optical power sensor 22 can be introduced into the optical disk surface at the same time.

§4: Description of Optical Power Sensor and Optical Head--See FIG. 6 FIG. 6 is an explanatory diagram of the optical power sensor and optical head. The relationship between the optical power sensor and the optical head is, for example, as shown in FIG.

In this example, an optical head in which the optical head is divided into a fixed optical system and a movable optical system is used. As illustrated, the fixed optical system 52 of the optical head 15 includes beam splitters 43 and 44, a semiconductor laser 46, a collimator lens 47, a Wollaston prism 49, a magneto-optical disk split detector 48, a focus servo split detector 51, Split detector 50 for tracking servo
Etc. are provided.

Further, the movable optical system includes an objective lens 42,
A mirror 45 and the like (in addition, a lens actuator and the like) are provided. At the time of normal read / write, the laser light from the semiconductor laser 46 proceeds in the order of the semiconductor laser 46, the collimator lens 47, the beam splitter 43, the mirror 45, the objective lens 42, and the optical disk 21, and is applied to the optical disk 21.

When the optical power sensor 22 is introduced into the optical disk surface to measure the laser light, the optical power sensor 22 is ejected and then the optical power sensor 22 is moved to the position shown in the figure, that is, via the beam splitter 43. The laser beam from the semiconductor laser 46 is received.

In this case, the laser light is the semiconductor laser 46.
The order of the collimator lens 47, the beam splitter 43, and the optical power sensor 22 is measured, and the laser light input by the optical power sensor 22 is measured.

§5: Description of Reproduced Signal Waveform--See FIG. 7 FIG. 7 is an explanatory diagram of a reproduced signal waveform, where A is a reproduced signal waveform example 1 (waveform in a ready state) and B is a reproduced signal waveform example. Two
(Waveform in Not Ready state).

In the reproduction waveform judgment circuit 6, the reproduction signal is compared with the comparison value. In this case, if the amplitude of the reproduced signal waveform is less than or equal to the upper limit and greater than or equal to the lower limit of the comparison value, the normal state is set, and the ready state (standby state for the next process) is set.

If the amplitude of the reproduced signal waveform is not more than the upper limit and not more than the lower limit of the comparison value, a signal is sent to the control unit 4 to turn on the diagnostic flag 39, and the not ready state (Not Ready) Standby state).

For example, the upper limit of the amplitude of the reproduction signal is 120 m
When v and the lower limit are 50 mv, the read signal waveform of FIG. 7A is in the ready state. Further, in the reproduction signal waveform shown in FIG. 7B, the not ready state is set, and a signal for turning on the diagnosis flag 39 is output.

§6: Description of Processing When Inserting Medium ... See FIG. 8 FIG. 8 is a flowchart of processing when inserting a medium. Less than,
Processing when an optical disc (hereinafter simply referred to as "medium") is inserted will be described based on the processing flowchart of FIG. It should be noted that S1 to S9 represent respective process numbers.

When a medium is inserted into the optical disc device,
The optical disk device detects that a medium has been inserted (detects that a medium has been inserted via a sensor or the like), and the control unit 4 and the controller 3 recognize this state.

When it is detected that the medium has been inserted (S1), the control unit 4 causes the spindle motor control unit 19 to operate.
In response, an instruction to rotate the spindle motor 18 (spindle ON) is issued to rotate the spindle motor 18 (S2).

Subsequently, the control unit 4 causes the light amount control unit 12 to LD
An instruction (S3) to turn on (laser diode ON) is issued to turn on the LD (laser light source) in the optical head 15. Further, the control unit 4 issues a servo-on instruction (S4) to the servo control unit 11 to drive the optical head 15.

Then, the data from the controller 3 is
The read / write circuit 5 sends the data to the optical head 15 to record data on the medium, and then reproduces the recorded data (S5).

At this time, the reproduced waveform determination circuit 6 compares the amplitude of the reproduced signal with the comparison value (S6).
As a result, the reproduction signal amplitude is less than or equal to the upper limit of the comparison value, and
If it is equal to or more than the lower limit, the state is ready (S).
7).

However, when the comparison value does not fall below the upper limit and above the lower limit, the diagnostic flag 39 of the control section 4 is turned on by the signal from the reproduced waveform judging circuit 6 (S8).
A not ready state is set (S9).

§7: Description of Processing During Data Read--See FIG. 9 FIG. 9 is a flowchart of processing during data read. Hereinafter, the processing at the time of data reading (processing at the time of normal data reading) will be described based on FIG. Note that S11 to S1
Reference numeral 3 indicates each processing number.

In the comparison processing of the reproduction signal amplitude, not only when the medium is inserted, but also when the data is read from the medium, the determination processing is similarly performed. Also in this case, if the reproduction signal amplitude is not within the range of the comparison value, the diagnostic flag 39
Turn on.

First, when data is read from the medium (S
11) The reproduced waveform determination circuit 6 compares the amplitude of the reproduced signal with the comparison value (S12). as a result,
If the reproduction signal amplitude is less than or equal to the upper limit and greater than or equal to the lower limit of the comparison value, the process ends.

However, if the comparison value does not fall below the upper limit and above the lower limit, the diagnostic flag 39 of the control section 4 is turned on by a signal from the reproduced waveform judging circuit 6 (S1).
3). §8: Description of processing during power calibration ... See FIGS. 10 and 11. FIG. 10 is a flowchart of processing during power calibration 1, FIG.
Is a processing flowchart 2 at the time of power calibration. Less than,
Processing at the time of power calibration will be described based on FIGS. 10 and 11. It should be noted that S21 to S30 represent respective process numbers.

When the optical disk device executes any processing, it always passes through the power calibration routine shown below. First, the controller 3 includes the flag unit 3 in the control unit 4.
Check the diagnostic flag 39 set to 8 (S2
1), diagnostic flag 39 is off (laser light is normal)
If so, the power calibration routine ends.

However, if the diagnosis flag 39 is on (ON laser light is not normal), it is confirmed that the medium is not mounted (S22). If a medium is loaded, eject the medium (optical disc) (S
23). In this case, according to an instruction from the control unit 4, the eject motor control unit 10 drives and controls the eject motor 14 to eject the medium.

When the control unit 4 confirms that the medium is not loaded (S22), it issues an instruction to the sensor drive motor control unit 8 to drive the sensor drive motor 13 under the control of the sensor drive motor control unit 8. Then, the optical power sensor 22 is introduced at the laser light irradiation position on the medium surface (S2).
4).

When the introduction of the optical power sensor 22 is completed,
From the control unit 4, the light amount control unit 12 is instructed to emit light with each power of write, read, and erase,
Laser light source (laser diode) in the optical head 15
Are caused to emit light at the respective powers. Then, the optical power sensor 22 measures the intensity of the laser beam at each power (S25).

Thereafter, the sensor monitor value measured by the optical power sensor 22 is input to the comparison and correction unit 28 in the control unit 4, and the comparison and correction unit 28 outputs the optical power sensor monitor value at that time and the power in the ROM 29. Compare with the set value.

As a result, when the sensor monitor value does not deviate from the power setting value (S26), it cannot be considered that the reproduction signal amplitude changes due to the change in the apparent intensity of the laser light (others). It is considered to be the cause), so the process ends.

However, if the sensor monitor value deviates from the power setting value (S26), the comparison and correction unit 2
It is necessary to instruct the light amount controller 12 to adjust the power to adjust the power of the laser light source.

At this time, the comparison correction unit 28 determines whether or not the power adjustment instruction value becomes larger than the preset maximum value of the power consumed by the laser light source (laser diode: LD) (S27). .

As a result, if the power adjustment instruction value does not become larger than the preset maximum value of the power consumed by the laser light source, the power of the laser light source is sent from the comparison correction unit 28 to the light amount control unit 12. , Each power setting value in the ROM 29 (each power setting value for write, read, erase)
A power adjustment instruction is issued to adjust the power of the laser light source to be equal to (S30).

However, when the power adjustment instruction value becomes larger than the preset maximum power consumption of the laser light source, the warning flag 40 set in the flag section 38 of the control section 4 is turned on. It is turned on (S28).

After that, the control section 4 reports to the controller 3 that normal correction could not be performed. Further, the controller 3 also reports to the host 2 that normal correction could not be performed.

Then, the comparison / correction unit 28 issues a power adjustment instruction to the light amount control unit 12 so that the power of the laser light source becomes equal to the maximum allowable power value, and the power of the laser light source is adjusted. (S29).

In this case, the light quantity control unit 12 sets the drive current of the laser light source (laser diode) so that the power consumption of the laser light source becomes the maximum value. (Other Embodiments) Although the embodiments have been described above, the present invention can be implemented as follows.

Not only the magneto-optical disk device but also other optical disk devices can be similarly applied. For example, it can be applied to an optical disk device that only performs reproduction. However, in the case of a read-only optical disk device, only the laser light at the time of reading is targeted.

The structure of the sensor housing portion may be any structure as long as the optical power sensor can be hermetically sealed and can be freely taken in and out.

[0095]

As described above, the present invention has the following effects. : Even if the apparent intensity of the laser beam decreases due to dust, dust, cigarette smoke, etc. adhering to the optical system in the optical disc device, the apparent intensity of the laser beam can be automatically adjusted. it can. Therefore, it is possible to suppress the occurrence of errors during read / write without performing maintenance.

As described above, when adjusting the laser light, the maximum value of the power consumed by the laser light source (semiconductor laser) is set in advance, so that the power is consumed to a level that shortens the life of the laser light source. There is no such thing. Therefore,
It is possible to prevent deterioration of the laser light source.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram of an optical disk device according to an embodiment.

FIG. 3 is a partial detailed view of FIG.

FIG. 4 is an explanatory diagram of an optical power sensor introduction mechanism in an example.

FIG. 5 is an explanatory diagram of a sensor storage unit according to the embodiment.

FIG. 6 is an explanatory diagram of an optical power sensor and an optical head in an example.

FIG. 7 is an explanatory diagram of reproduced signal waveforms in the example.

FIG. 8 is a processing flowchart when a medium is inserted in the embodiment.

FIG. 9 is a processing flowchart at the time of data reading in the embodiment.

FIG. 10 is a processing flowchart 1 at the time of power calibration in the embodiment.

FIG. 11 is a processing flowchart 2 at the time of power calibration in the embodiment.

[Explanation of symbols]

 1 Optical Disc Device 3 Controller 4 Control Unit 5 Read / Write Circuit (R / W Circuit) 6 Playback Waveform Judgment Circuit 11 Servo Control Unit 12 Light Amount Control Unit 15 Optical Head 18 Spindle Motor 21 Optical Disc (Medium) 22 Optical Power Sensor 25 Optical Power Sensor control unit 26 Optical power sensor introduction mechanism

Claims (6)

[Claims] 1. An optical head (15) for irradiating an optical disk (21) with laser light and receiving the reflected light to obtain a light reception signal, and a light amount for controlling the intensity of the laser light with which the optical disk (21) is irradiated. An optical disk device that includes a control unit (12) and records and reproduces data on and from an optical disk (21) by irradiating laser light from the optical head (15). Optical power sensor (2
An optical disk device having a built-in 2) and capable of measuring the intensity of laser light on the optical disk surface (medium surface). 2. The optical disk device according to claim 1, wherein a sensor housing portion (31) for hermetically housing the optical power sensor (22) and the sensor housing portion when the optical power sensor (22) is used. An optical disk device comprising an optical power sensor introducing mechanism (26) for extracting an optical power sensor from (31) and introducing the optical power sensor to a laser light irradiation position on the optical disk surface. 3. The optical disk device according to claim 1, further comprising a reproduction waveform judgment circuit (6) for judging the size of a reproduction signal reproduced from the optical disk (21), and the reproduction waveform judgment circuit (6) makes a judgment. As a result, when the magnitude of the reproduction signal is not within the preset magnitude range, the optical power sensor (22) is introduced at the laser light irradiation position on the optical disc surface to measure the intensity of the laser light. Optical disk device characterized by. 4. The optical disk device according to claim 3, wherein the optical power sensor (22) measures the intensity of the laser beam, and the intensity of the laser beam at the time of recording, reproducing and erasing the optical disc (21). An optical disk device characterized by measuring the height. 5. The optical disc device according to claim 3, wherein when the result of the measurement by the optical power sensor (22) shows that the intensity of the laser light is out of the preset power setting value, the light amount control unit According to (12), the optical disk device is characterized in that the intensity of the laser beam is adjusted to the same value as the power setting value. 6. The optical disc device according to claim 5, wherein, when adjusting the intensity of the laser light, if a preset maximum power consumption of the laser light source is exceeded, a warning is issued and the power consumption An optical disk device characterized by being adjusted so as not to exceed the maximum value.