JPH0793803A - Optical disk device - Google Patents

Abstract

PURPOSE:To prevent unstable recording, reproducing and erasing by detecting deterioration of a semiconductor laser of an optical head before recording information on an-optical disk. CONSTITUTION:The optical disk device is provided with a checking reflecting surface for reflecting irradiating light from the optical head 3 at a constant rate in a movable range of the optical head 3 by a moving means. This optical head 3 is moved by the moving means into a checking range for irradiating the checking reflecting surface with the light, and the light is projected from the optical head 3 to read out intensity of its reflected light from the checking reflecting surface, so as to compare it with a preset reference value, and if the intensity of the reflected light is lower than the reference value, it is decided that the semiconductor laser is deteriorated in performance, and informed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting the performance of a light source of an optical disk device for recording or reproducing information on or from an optical disk, such as a semiconductor laser, an optical disk device and an optical disk.

[0002]

2. Description of the Related Art As is well known, various optical disk devices have been developed which record information on an optical disk or read information recorded on an optical disk by laser light output from a semiconductor laser in an optical head.

Here, the semiconductor laser has a temperature / humidity change,
The output light amount may decrease due to deterioration due to aging (lifetime) and the like.

Conventionally, there is no special means for detecting this,
The data that should have been recorded on the optical disk cannot be read, that is, the semiconductor laser has deteriorated during recording, and the data was not recorded because the data was recorded with a power below the specified value. It was judged that the laser had deteriorated only when I noticed it at the time of reading.

[0005]

However, even if the semiconductor laser of the optical head deteriorates, there is no detection means, so that the semiconductor laser deteriorates and data is recorded in a state where the output is small. There is a problem that the detection value is unstable and unreadable, or that it is later known that the data that should have been recorded (pits are formed on the optical disc) is not recorded (pits are not formed on the optical disc). there were.

Therefore, the present invention provides an apparatus and method capable of detecting deterioration of a light source of an optical head, for example, a semiconductor laser before recording / reproducing information on / from an optical disc, and preventing unstable recording or reproducing. The purpose is to do.

[0007]

According to a first aspect of the present invention, an optical head having a light source for writing and reading data by irradiating a rotating optical disk with light, and the optical head described above are provided. In an optical disc device having a moving unit that moves in the radial direction of the optical disc, an inspection reflecting surface that reflects the irradiation light from the optical head at a constant ratio is provided within a movable range of the optical unit by the moving unit. A method of inspecting the performance of a light source, wherein the optical head is moved to an inspection range for irradiating the inspection reflective surface with light by a moving means, and light is emitted from the optical head,
Reading the intensity of the reflected light from the inspection reflective surface, comparing with a predetermined reference value, when the intensity of the reflected light is less than the reference value, it is determined that the performance of the semiconductor laser is deteriorated,
There is provided a light source performance inspection method for an optical disk device, which is characterized by notifying.

According to another aspect of the present invention, an optical head having a semiconductor laser for writing and reading data by irradiating a rotating optical disc with light,
In an optical disk device having a moving means for moving the optical head in the radial direction of the optical disk, the optical head is provided within a movable range of the moving means of the optical head, and reflects irradiation light from the optical head at a constant ratio. The inspection reflective surface, and the irradiation light is provided with a determination means for comparing the intensity of light reflected from the inspection reflective surface and a predetermined value to determine the performance of the semiconductor laser. An optical disc device is provided.

The reflecting surface for inspection can be provided on the optical disk, a part of the case of the optical disk, or the main body of the optical disk device.

The above-described apparatus and method of the present invention are
It is possible to use an optical disk having a reflective surface for inspection of a semiconductor laser of an optical disk device on at least a part of a surface irradiated with light from an optical head, and the reflective surface for inspection is preferably formed as a mirror surface. To be done.

[0011]

According to the present invention, within the movable range of the optical head by the moving means, that is, at least a part of the optical disk,
A part of the case of the optical disk, the main body of the optical disk device, or a reflection surface for inspection, which is, for example, a mirror surface, which reflects the irradiation light from the optical head, is provided. Is moved to the inspection range where the light is radiated to, the light is emitted from the optical head, the intensity of the reflected light from the inspection reflective surface is read and compared with a predetermined reference value, and the intensity of the reflected light is less than or equal to the reference value. If it is, it is determined that the performance of the light source, for example, the semiconductor laser is deteriorated, and the notification is given.

Therefore, the deterioration of the light source of the optical head, for example, the semiconductor laser can be detected before the information is recorded / reproduced on the optical disc, and the unstable recording / reproduction can be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an optical disk device. That is, grooves (recording tracks) are spirally formed on the surface of an optical disk (recording medium) 1 formed of an optical disk or the like, and the optical disk 1 is rotated by a motor 2 at a constant speed, for example. The motor 2 is controlled by a motor control circuit 18.

The optical disk 1 has a donut-shaped metal coating layer such as a surface of a substrate formed of glass or plastic in a circular shape.
A notch, that is, a reference position mark, is provided near the center of the metal coating layer.

Further, as shown in FIG. 4, the optical disc 1 has a mirror area 1a of a mirror surface which is a reflection surface for inspection and a characteristic data recording area provided on the inner peripheral side of the mirror area 1a and having no guide groove. 1b and.

In the characteristic data recording area 1b, as shown in FIG.
As shown in, the characteristic data is recorded in advance in the form of a bar code in the circumferential direction at the time of manufacturing. As the characteristic data, the characteristic (reflectance) of the film of the optical disc 1, the power at the time of semiconductor laser recording and reproducing, and the like are recorded. As shown in FIG. 3, the characteristic data recording area 1b indicates information in a continuous or discontinuous pit row and is recorded radially in the radial direction of the optical disc 1, and the recording position is from the center of the optical disc 1. It is defined by the distance (radial position).

Irradiation of the laser beam onto the optical disc 1 is carried out by an optical head 3 provided below the optical disc 1 as shown in FIG.

An objective lens 6 is held on the optical head 3 by a wire or a leaf spring (not shown). The objective lens 6 is moved by a driving coil 5 in the focusing direction (optical axis direction of the lens) and driven. The coil 4 allows movement in the tracking direction (direction orthogonal to the optical axis of the lens).

A shielding plate 3a is provided below the optical head 3 as shown in FIG. 4, and the shielding plate 3a is provided.
Due to this, the detector 36 is shielded from light.

The detector 36 detects that the moving position of the optical head 3 is located at the innermost circumference (inner circumference end) of the optical disk 1 when the light is shielded by the shield plate 3a. The laser beam is the characteristic data recording area 1b.
It is provided at a position where it can be detected that it is being irradiated.

The laser light generated by the semiconductor laser oscillator 9 driven by the laser control circuit 14 is
The optical disc 1 is irradiated with light through the collimator lens 11a, the half prism 11b, and the objective lens 6, and the reflected light from the optical disc 1 passes through the objective lens 6, the half prism 11b, the condenser lens 10a, and the cylindrical lens 10b. It is guided to the photodetector 8.

The photodetector 8 is a 4-division photodetector cell 8.
It is composed of a, 8b, 8c and 8d.

The output signal of the photodetector cell 8a of the photodetector 8 is supplied to one end of the adders 30a and 30c through the amplifier 12a, and the output signal of the photodetector cell 8b is supplied to the amplifier 1.
Is supplied to one end of the adders 30b and 30d via 2b,
The output signal of the photo detection cell 8c is supplied to the other ends of the adders 30b and 30c via the amplifier 12c, and the photo detection cell 8d
Output signal of the adder 30a, 3 via the amplifier 12d.
It is supplied to the other end of 0d.

The output signal of the adder 30a is supplied to the inverting input terminal of the differential amplifier OP1.
The output signal of the adder 30b is supplied to the non-inverting input terminal of. As a result, the differential amplifier OP1 supplies the track difference signal to the tracking control circuit 16 according to the difference between the adders 30a and 30b. The tracking control circuit 16 creates a track drive signal according to the track difference signal supplied from the differential amplifier OP1.

The track drive signal output from the tracking control circuit 16 is supplied to the drive coil 4 in the tracking direction. Further, the track difference signal used in the tracking control circuit 16 is supplied to the linear motor control circuit 17.

The linear motor control circuit 17 responds to the track difference signal from the tracking control circuit 16 and the movement control signal from the CPU 23 to apply a voltage corresponding to the moving speed to a drive coil (conductor) 13 in a linear motor 31 described later. Is applied.

The linear motor control circuit 17 utilizes an electric change inside the drive coil 13 at the moment when the drive coil 13 in the linear motor 31 described later crosses a magnetic flux generated by a magnetic member (not shown). , Drive coil 1
A speed detection circuit (not shown) for detecting the relative speed between the magnetic member 3 and the magnetic member, that is, the moving speed of the linear motor 31 is provided.

The output signal of the adder 30c is supplied to the inverting input terminal of the differential amplifier OP2, and the output signal of the adder 30d is supplied to the non-inverting input terminal of the differential amplifier OP2. As a result, the differential amplifier OP2 supplies a signal regarding the focus point to the focusing control circuit 15 according to the difference between the adders 30c and 30d. The output signal of the focusing control circuit 15 is supplied to the focusing drive coil 5 and is controlled so that the laser light is always just focused on the optical disc 1.

Each of the photodetectors 8a, 8a of the photodetector 8 in the state where focusing and tracking are performed as described above.
The sum signal of the outputs of d, that is, the output signals from the adders 30a and 30b reflect the change in the reflectance from the pits (recording information) formed on the track. This signal is supplied to the signal processing circuit 19, and this signal processing circuit 1
At 9, recorded information and address information (track number, sector number, etc.) are reproduced. In addition, the laser control circuit 14
A recording signal generation circuit 34 as a modulation circuit for modulating the recording signal is provided in the preceding stage.

The reproduction signal (reproduction information) reproduced by the signal processing circuit 19 is output to the recording medium control device 33 as an external device through the interface circuit 32.

Further, the video signal of the signal processing circuit 19 is supplied to the reading circuit 35. The reading circuit 35 receives the video signal from the signal processing circuit 19 and then the envelope 2 corresponding to the recording data in the characteristic data recording area 1b.
It outputs a binarization signal, and is composed of an envelope detection circuit and an envelope binarization circuit (not shown).

Further, the optical disk device has a focusing control circuit 15 and a tracking control circuit 1, respectively.
6. A D / A converter 22 used for exchanging information between the linear motor control circuit 17 and the CPU 23 is provided.

Further, the tracking control circuit 16 is
The objective lens 6 is moved according to a track jump signal supplied from the CPU 23 via the D / A converter 22, and the beam light is moved by one track.

The laser control circuit 14, focusing control circuit 15, tracking control circuit 16, linear motor control circuit 17, motor control circuit 18, signal control circuit 1
9, the reading circuit 35, etc. are connected to the CP via the bus line 20.
It is controlled by U23, and this CP
The U23 is adapted to perform a predetermined operation according to a program stored in the memory 24.

When the characteristic data recording area 1b is accessed, the CPU 23 moves the optical head 3 from the innermost movable side of the optical head 3 to the outer side, and thereafter, the detector 3
When the detection signal is supplied from 5, it is determined that the moving position of the optical head 3 is located at the innermost circumference (inner end portion) of the optical disc 1. Further, the CPU 23 moves the laser light from the optical head 3 from the innermost circumference of the optical disc 1, and when the detection signal from the detector 35 has an intermediate value,
The laser light emitted from the optical head 3 is recorded in the characteristic data recording area 1
The movement of the optical head 3 is stopped when it is determined that the light is irradiated near the center of the radial position of b.

At this time, the characteristic data in the characteristic data recording area 1b is read by checking the time interval between the high level and the low level of the envelope binarized signal supplied from the reading circuit 35, and the read characteristic data is read. The control corresponding to is performed.

Next, the medium control device 3 of this optical disk device
The configuration of No. 3 will be described. FIG. 11 shows the configuration of an image filing device which is the medium control device 33 of this optical disc device. This image filing device includes a control module 40, a memory module 42, an image processing module 44, a communication control module 46, and a scanner device 4.
8, keyboard 53, CRT display device 54, printer device 55, magnetic disk 56 and magnetic disk device 57, mouse 59, system bus 90, image bus 6
2, the character recognition unit 59, and the optical disc 4 according to the present invention
9 and the optical disk device 50.

The control module 40 connects the CPU 64 for performing various controls for image storage, search and edit processing on the optical disc 49, the optical disc device 50, the magnetic disc device 57 and the CPU 64, and the CP.
It is composed of an interface control unit 66 which gives an instruction to read the optical disk data to the magnetic disk device 57 using the function of U64. A keyboard 53 and a mouse 59 are connected to the CPU 64.

The memory module 42 serves as a main memory 68 for storing various control programs for image storage, retrieval, editing, etc. and management information, and as an image memory having a storage capacity corresponding to images of several pages of A4 size document. Page memory 70, a display memory 72 as a display interface, a display controller 74, and the like. A buffer memory 70 is provided in a part of the page memory 70.
The area a is provided. The page memory 70 is, for example, image data stored on the optical disc 49 or the optical disc 4.
9 is a memory for temporarily storing the image data read from the optical disc 9, and the buffer memory 70a is a memory for temporarily storing the data read from the optical disc 49.

The display memory 72 is for temporarily storing the image displayed by the CRT display device 54. The display control unit 74 controls the display processing of the CRT display device 54 and the like.

The image processing module 44 enlarges an image,
Enlargement / reduction circuit 76 for performing reduction processing, vertical / horizontal conversion circuit 78 for performing image rotation processing, compression / decompression circuit (CODEC) 80 for performing image compression / decompression, scanner interface 82 for scanner device 48, printer interface for printer device 55. 84, the enlargement / reduction circuit 76, the vertical / horizontal conversion circuit 78, the compression / expansion circuit 80, the scanner interface 82, and the printer interface 84.
It is constituted by an internal bus 86 for connecting to.

The compression / expansion circuit 80 uses an MH (Modified Huff).
Band compression or band expansion is performed using a man (man) method, an MR (Modified Read) method, or the like. The communication control module (interface) 46 is
For example, Local Area Network
BCP (Bus Communication) connected to a communication line such as ork)
A communication interface 88 such as a processor), and a host computer (not shown) is connected via this communication line. In addition, the communication control module 4
6 is a UCP connected to an external device such as an FCP (facsimile connection mechanism) or a personal computer through an interface.
(Universal Communication Processor) may be provided.

The system bus 90 is a bus for control signals of various devices, and connects the control module 40 with the memory module 42, the image processing module 44, and the communication control module 46. The image bus 62 is an image bus, and connects the memory module 42, the image processing module 44, and the communication control module 46.

The scanner device 48 is, for example, a two-dimensional scanning device and obtains an electric signal according to an image on the original by scanning the original (document) two-dimensionally with a laser beam.

Further, the optical disc device 50 uses the image read by the scanner device 48 as described above for the optical disc 4.
9 are sequentially stored, and the keyboard 53
The image corresponding to the search code designated by the above is searched from the optical disk 49.

The keyboard 53 is used to input a unique search code corresponding to an image stored in the optical disk 49 and various operation commands for storage, search, edit processing and the like. In addition, the mouse 59 moves the cursor (not shown) displayed on the display window of the CRT display device 54, for example, vertically and horizontally to give an instruction at a desired position so that the cursor is positioned. The display contents are selected or instructed.

The CRT display device 54 displays the image read by the scanner device 48 and the image retrieved from the optical disk 49. Icons and the like are displayed at the upper end, lower end, and right end of the display window of the CRT display device 54. The printer device 55 prints out (hardcopy) the image read by the scanner device 48, the image retrieved from the optical disk 49, or the image displayed on the CRT display device 54.

The magnetic disk device 57 stores various control programs on the magnetic disk 56 mounted on the magnetic disk device 57, and also stores a search code input from the keyboard 53 and an image corresponding to the search code. It stores search data (search information) including a storage address on the optical disk 49, an image size, a search frequency, and the like.

The search data is managed by a document management table. In this document management table, one document number is stored for each search code (image name) consisting of a plurality of search keys. A title management table 56a, a page management table 56b in which record numbers are stored in page units of one document, a storage address (storage start position) of an image on the optical disk 49 for each record number, a document size (image size), The record management table 56c stores image attributes such as compression method and resolution, and search frequency (access frequency).

The storage address is a logical address, and the physical track address and the physical sector address are calculated from this at the time of access.

The character recognizing section 69 performs character recognition on the dot image data of the image, converts it into a character code, and outputs it. For example, one line unit of the image data stored in the page memory 70 is taken out and recognized for each character. As a result, the character code for searching when performing the character search is output.

Next, the operation of accessing the characteristic data recording area 1b of the optical disc 1 in such a configuration will be described.

For example, the instruction to access the characteristic data recording area 1b shown in FIG.
23. Then, the CPU 23 controls the linear motor control circuit 17 to move the optical head 3 from the inside to the outside. When the detector 36 is shielded from light by the shield plate 3 a of the optical head 3, the detection signal from the detector 36 is supplied to the CPU 23. Then, the CPU 23 determines that the moving position of the optical head 3 is the disk 1
It is judged that it was located on the innermost circumference (inner end).

Further, the CPU 23 controls the optical disk 1
The laser light from the optical head 3 is moved from the innermost circumference of
When the detection signal of the detector 36 becomes an intermediate value ((a + b) / 2) between a and b shown in FIG. 4B, the optical head 3
Of the optical head 3 is determined to have been positioned on the innermost circumference of the optical disc 1, and the laser beam from the optical head 3 has been irradiated to the vicinity of the center of the radial position of the characteristic data recording area 1b. Stop moving.

Then, the CPU 23 reads the characteristic data in the characteristic data recording area 1b by checking the time interval between the high level and the low level of the envelope binary signal from the reading circuit 35 at this time. The control corresponding to the read characteristic data is performed. That is, the control corresponding to the optical disc 1 having various specifications is performed.

For example, the characteristics of the film of the optical disc 1 (reflectance), the power of the semiconductor laser for recording and reproducing, and the like are controlled by corresponding specifications.

As described above, the characteristic data recording area 1b
When accessing the optical head 3, the optical head 3 is moved from the inside, and then, based on the detection signal supplied from the detector 36, it is determined that the moving position of the optical head 3 is located at the innermost circumference of the optical disc 1, and The movement of the optical head 3 is stopped when it is determined that the laser light of the head 3 is applied to the center of the radial position of the characteristic data recording area 1b.

As a result, the detector 36 for detecting the innermost circumference as the movable range of the optical head 3 is used.
The irradiation position of the laser beam by the characteristic data recording area 1b
The center of the radial position is aligned.

In this embodiment, the case where the characteristic data recording area is moved from the inner side has been described, but the present invention is not limited to this, and the movement may be started from the outer side or an arbitrary position. good.

Next, the control means for detecting the deterioration of the semiconductor laser will be described with reference to FIG. A linear motor 31 for moving the optical head 3 in the radial direction of the optical disc 1 moves the optical head 3 to the mirror area 1a in the outer peripheral direction of the optical disc 1. (See FIG. 1B. A detector 42 for detecting that the optical head 3 has moved to the position of the mirror area 1a is installed at an arbitrary position.

The operation of accessing the mirror area 1a will now be described.

For example, an instruction to access the mirror area 1a from the recording medium control device 33 is supplied to the CPU 23. Then, the CPU 23 controls the linear motor control circuit 17 to move the optical head 3 from the inside to the outside.

When the detector 42 is shielded from light by the shield plate 3a of the optical head 3, a detection signal from the detector 42 is supplied to the CPU 23. Then, the CPU 23 determines that the moving position of the optical head 3 is located at the mirror area 1a (FIG. 3) outside the optical disc 1.

Further, the CPU 23 controls the optical disk 1
The laser light from the optical head 3 of the
4 becomes the value of b shown in (b) of FIG. 4, the moving position of the optical head 3 moves to the mirror area 1 of the optical disc 1.
It is determined that the optical head 3 is positioned at a and that the laser light from the optical head 3 is applied to the mirror area 1a, and the movement of the optical head 3 is stopped.

Next, the CPU 23 reads the characteristic data of the mirror area 1a by checking the high level of the envelope binarization signal from the reading circuit 35 at this time, and performs the control corresponding to the read characteristic data. To do.

For example, the reflectance of the mirror and the power of the semiconductor laser during recording are controlled by corresponding specifications.

As described above, when accessing the mirror area 1a, the optical head 3 is moved from the inside, and then the detection signal supplied from the detector 42 causes the optical head 3 to move.
It is determined that the moving position of the optical head 3 is located on the outer periphery of the optical disc 1, and the laser light of the optical head 3 is reflected by the mirror area 1.
The movement of the optical head 3 is determined to be stopped when it is determined that the light is irradiated to a.

Here, when the characteristic data of the mirror area 1a is read, when the output signal cannot be read as a normal waveform, or when the designated recording power is output, this power can be detected by the signal processing circuit 19. It is possible to judge that the semiconductor laser 9 is deteriorated by judging whether there is a large difference by comparing with the characteristic data stored in advance in the memory 24 (when it is a value other than the specified value).

When it is determined that the semiconductor laser 9 is deteriorated, the CPU 32 sends a message to that effect to the recording medium control device 33 of FIG. 11 via the interface circuit 32, and the recording medium control device 33 informs that effect. The message is displayed on the CRT display device 54 from the display controller 74.

From this display, the operator can recognize that the semiconductor laser 9 has deteriorated and request the replacement of the semiconductor laser 9.

Therefore, according to the present embodiment, it is possible to determine that the semiconductor laser 9 is deteriorated, so that the optical disc 1
There is no need to record in an unstable state, that is,
It is possible to always emit a laser with normal recording, reading or erasing power, and it is possible to read the recorded data on the optical disc 1 accurately.

The optical disc 1 is not used for conventional recording / reproducing, but is executed as a dedicated optical disc for inspection and maintenance to detect the abnormality of the optical head mechanism and the abnormality of the semiconductor laser. It is meant to be done.

Next, a second embodiment of the present invention will be described.

5 and 6 show the second embodiment of the present invention. In this embodiment, the mirror area 1c is provided on the upper surface of the normal recording optical disc 1 and further inside the characteristic data recording area 1b inside the data recording area 1a.
Is the same as that of the first embodiment except that it is provided. Then, as shown in FIG. 5, the detector 42 is provided at a position corresponding to the mirror area 1c, and the optical head 3 is moved in the radial direction of the optical disc 1 by the linear motor 31 to drive the optical disc 1.
The optical head 3 is moved to the mirror area 1c in the outer peripheral direction. (See FIG. 5 (b)). The detector 42 detects that the optical head 3 has moved to the position of the mirror area 1c, performs the same processing as in the first embodiment, and detects and displays the deterioration of the semiconductor laser.

FIG. 9 shows a third embodiment of the present invention.

In this embodiment, similar to the second embodiment, the mirror area 1c is provided between the recording area 1a and the characteristic data recording area 1b on the upper surface of the recording optical disk, except that the mirror area 1c is provided. Since it is similar to the embodiment, detailed description thereof will be omitted.

Further, FIGS. 9 and 10 show the fourth embodiment of the present invention.
FIG.

In this embodiment, as shown in FIG. 10B, the mirror portion 1c, which is the reflection surface for inspection, is the opening portion of the shutter 92 of the case 91 of the optical disc 1 in the tracking direction of the optical head 3. The linear motor 31 is extended to this portion as shown in FIG. 9, the detector 42 is provided at a portion corresponding to this mirror area 1c, and the optical head 3 is controlled to be positioned at this portion. Then, the deterioration of the semiconductor laser is detected as in the first embodiment.

FIG. 8 shows a fifth embodiment of the present invention.

In this embodiment, the mirror portion 1c, which is a reflection surface for inspection, is provided at an extension of the optical head 3 in the tracking direction inside the main body 95 of the optical disk device, and the linear motor 31 is provided as in the fourth embodiment. The detector 42 is extended to this portion, a detector 42 is provided at a portion corresponding to the mirror area 1c, and the optical head 3 is controlled to be positioned at this portion, and the deterioration of the semiconductor laser is detected as in the first embodiment. .

[0082]

As described above, according to the present invention, the semiconductor laser deterioration of the optical disk device is caused before the inspection reflective surface is irradiated with light from the semiconductor laser and the optical disk is recorded depending on the state of the reflected light. If the semiconductor laser can be detected early and the semiconductor laser is replaced when it starts to deteriorate, the error occurrence rate of the optical disk device can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a portion of an optical head of an optical disk device of the present invention.

FIG. 2 is a circuit block diagram of a drive mechanism of the optical disk device.

FIG. 3 is a plan view of an example of an optical disc used in the optical disc device of the present invention.

FIG. 4 is a diagram showing a relationship between an optical disc and an optical head according to an embodiment.

FIG. 5 is a diagram showing a relationship between an optical disc and an optical head of another embodiment.

FIG. 6 is a plan view of an example of an optical disc of still another embodiment.

FIG. 7 is a plan view of an example of an optical disc of still another embodiment.

FIG. 8 is a plan view of an example of an optical disc of still another embodiment.

FIG. 9 is a plan view of an example of an optical disc of still another embodiment.

FIG. 10 is a plan view of an example of an optical disc of still another embodiment.

FIG. 11 is a circuit block diagram of an optical medium control device used in the optical disk device of the present invention.

FIG. 12 is a flowchart for explaining the principle operation of the present invention.

[Explanation of symbols]

1 ... Optical disc, 1a ... Data area, 1b ... Characteristic data area, 1c ... Mirror area, 3 ... Optical head, 9 ...
Semiconductor laser, 23 ... CPU, 33 ... Recording medium control device, 35 ... Read circuit, 42 ... Mirror area detector.

Claims (12)

[Claims] 1. An optical disk apparatus comprising a light source, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. A method for inspecting the performance of the light source by providing an inspection reflective surface for reflecting the irradiation light from the optical head at a constant ratio within a movable range of the optical head by the moving means, The moving means is moved to the inspection range where the inspection reflective surface is irradiated with light, the light is emitted from the optical head, the intensity of the reflected light from the inspection reflective surface is read, and the intensity of the read reflected light is determined in advance. Compared with the reference value, when the intensity of the reflected light is less than or equal to the reference value, it is determined that the performance of the light source is deteriorated, and the notification is given. Performance test method. 2. An optical disk apparatus comprising a light source, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. A method for inspecting the performance of the light source by providing an inspection reflecting mirror surface for reflecting irradiation light from the optical head within a movable range of the optical head by the moving means, wherein the optical head is the inspection reflecting mirror surface. Move to the inspection range to irradiate with light, irradiate the light from the optical head, read the intensity of the reflected light from the inspection reflecting mirror surface, compare the read reflected light intensity with a predetermined reference value, A method for inspecting a light source performance of an optical disk device, characterized in that when the intensity of reflected light is equal to or lower than a reference value, it is determined that the performance of the light source has deteriorated and a notification is given. 3. An optical disk device comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, the inspection reflection surface for reflecting the irradiation light from the optical head at a constant rate, and the irradiated light is reflected from the inspection reflection surface. An optical disc apparatus comprising: a determination unit that determines the performance of a semiconductor laser by comparing the intensity of light with a predetermined value. 4. An optical disk apparatus comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, a reflection mirror surface for inspection that reflects the irradiation light from the optical head, and the intensity of the light that is irradiated from the reflection mirror surface for inspection. An optical disc device comprising: a determination unit that determines the performance of the semiconductor laser by comparing a predetermined value. 5. An optical disk apparatus comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, the inspection reflection surface for reflecting the irradiation light from the optical head at a constant rate, and the irradiated light is reflected from the inspection reflection surface. An optical disk device comprising: a judging means for judging the performance of a semiconductor laser by comparing a light intensity with a predetermined value, wherein the reflecting surface for inspection is provided on an optical disk. 6. An optical disk apparatus comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, a reflection mirror surface for inspection that reflects the irradiation light from the optical head, and the intensity of the light that is irradiated from the reflection mirror surface for inspection. An optical disk device comprising: a judging unit for judging the performance of the semiconductor laser by comparing a predetermined value with the reflecting mirror surface for inspection. 7. An optical disk apparatus comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, the inspection reflection surface for reflecting the irradiation light from the optical head at a constant rate, and the irradiated light is reflected from the inspection reflection surface. An optical disk comprising: a judging means for judging the performance of a semiconductor laser by comparing a light intensity with a predetermined value, wherein the reflecting surface for inspection is provided on a part of a case of the optical disk. apparatus. 8. An optical disk apparatus comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, a reflection mirror surface for inspection that reflects the irradiation light from the optical head, and the intensity of the light that is irradiated from the reflection mirror surface for inspection. An optical disk device comprising: a judging means for judging the performance of the semiconductor laser by comparing a predetermined value with the inspection reflecting mirror surface provided on a part of a case of the optical disk. 9. An optical disk device comprising a semiconductor laser, comprising an optical head for writing and reading data by irradiating a rotating optical disk with light, and a moving means for moving the optical head in the radial direction of the disk. In, in the movable range of the optical head by the moving means, the inspection reflection surface for reflecting the irradiation light from the optical head at a constant rate, and the irradiated light is reflected from the inspection reflection surface. An optical disc device comprising: a determination means for comparing the intensity of light with a predetermined value to determine the performance of a semiconductor laser, wherein the inspection reflection surface is provided in the main body of the optical disc device. 10. An optical disk device comprising a semiconductor laser, comprising: an optical head for writing and reading data by irradiating a rotating optical disk with light; and a moving means for moving the optical head in a radial direction of the disk. In, in the movable range of the optical head by the moving means, a reflection mirror surface for inspection that reflects the irradiation light from the optical head, and the intensity of the light that is irradiated from the reflection mirror surface for inspection. An optical disk device comprising: a judging means for judging the performance of the semiconductor laser by comparing a predetermined value with the inspection reflecting mirror surface provided in the main body of the optical disk device. 11. An optical disk having a reflection surface for inspecting the light source performance of an optical disk device on at least a part of a surface irradiated with light from an optical head. 12. An optical disc having a reflection surface for inspecting the light source performance of an optical disk device on at least a part of a surface irradiated with light from an optical head, and the reflection surface for inspection is a mirror surface.