JPH0636323A - Optical disk and optical disk device - Google Patents

Abstract

PURPOSE:To record/reproduce data even at the time of using a cleaning disk. CONSTITUTION:A normal optical disk 1 where data can be recorded and reproduced is partially provided with a brush area in the radial direction. The optical disk is preliminarily divided into an ID area 2 where address information or the like is recorded and a data area 3 where data is recorded. Though the brush area 4 can be provided in any place (or places) on the optical disk, it is provided in a position preliminarily determined to the ID area 2 or the data area 3. The brush area 4 is provided with a brush; and when focus control is applied, it is brought into contact with the surface of an objective lens to clean this surface by rotation of the optical disk 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an optical disk and an optical disk device, and more particularly to an optical disk for lens cleaning and an optical disk device.

[0002]

2. Description of the Related Art In an optical disk as a recording / reproducing system using a laser beam, high-density concave and convex signals called pits are recorded as concentric or spiral tracks on one surface of a transparent body of acrylic resin or polycarbonate resin. A metal reflective film is formed on the uneven surface to form an information recording surface. When reproducing information, a laser beam is usually used, an objective lens composed of an optical lens is used to focus on the information recording surface, and the optical lens system is electrically controlled to correctly track the track. And then regenerate the signal. If dust adheres to the objective lens for reproducing such a high-density signal or various foreign matters existing in the air adhere, the optical performance is deteriorated immediately.

In order to solve this problem, for example, Japanese Patent Publication No. 1-43386 proposes an "optical disk for lens cleaning". In this publication, a disc on which optical information is recorded and a brush made of fiber are provided on one surface of the disc facing the objective lens, and the objective lens and the brush are brought into contact with each other when the disc is rotated. It was done.

Generally, in an optical disk device, highly accurate servo control of the light spot is performed by the reflected light from the optical disk. In order to reproduce the data from the optical disk (or store the data in the optical disk), this highly accurate servo control allows the light spot to be about 1 on the optical disk.
It is necessary to focus on a micron diameter and perform positioning (tracking) with submicron accuracy.

FIG. 6 is a diagram showing a conventional optical disk for lens cleaning. In the figure, 31 is a light spot, 32 is a track, 33a and 33b are brushes, 34 is an ID area,
Reference numeral 35 is a data area, and 36 is a brush area. The bristles of the brushes 33a and 33b planted on the surface of the optical disk are much larger than the light spot 31, and when the light spot 31 passes through the brush area 36, normal reflected light cannot be obtained. Therefore, in the brush area 36, a normal servo signal cannot be obtained, the servo is lost, and it becomes impossible to reproduce data from the optical disc (or record data from the optical disc).

Therefore, since a normal servo signal cannot be obtained in the brush area 36, it is necessary to make the time for the spot to pass through the brush area 36 as short as possible (thus making the width of the brush area 36 as narrow as possible). Further, in the conventional example, the degree of lens cleaning is detected by reproducing a prerecorded signal, but in general, the deterioration of the characteristics when the lens is contaminated is more remarkable in the recording characteristics than in the reproduction characteristics. / There is a problem that it is not possible to confirm a sufficient degree of cleaning for a reproducible optical disc.

[0007]

[Object] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical disk device and an optical disk capable of recording / reproducing data even when a cleaning disk is used.

[0008]

In order to achieve the above object, the present invention provides (1)
The information is divided into predetermined information units, and the recording and / or reproduction of the information in which the address information indicating the address of the divided area is recorded in advance is performed optically.
The address information is recorded in advance on an optical disc in which a brush made of a fibrous material is provided on one surface and a surface facing the objective lens, and the surface of the objective lens is cleaned by bringing the brush light into contact with the objective lens during rotation. A brush is provided along a radial direction at a predetermined position with respect to a predetermined area, or (2) an optical disc apparatus for recording / reproducing information using the optical disc according to claim 1, Control means for performing tracking and / or focusing control of a light spot by the reflected light of the optical disc; information reading means for reading address information and recorded information; and synchronizing means for synchronizing the output of the information reading means with a clock. Generating means for generating a timing signal indicating the area where the brush is provided from the output of the synchronizing means, Discontinuing the tracking and / or focusing control according to the output of the generating means, and (3) in (2), cleaning the surface of the objective lens in the area where the brush is provided. After that, the area other than the area where the brush is provided is recorded, and the recorded information is reproduced to detect the cleaning degree of the objective lens. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining an embodiment of an optical disc according to the present invention, in which 1 is an optical disc,
2 is an ID area, 3 is a data area, and 4 is a brush area. A part of the normal optical disk 1 that can be recorded and reproduced
The brush area 4 is provided along the radial direction. The optical disc 1 is divided into an ID area 2 in which address information and the like are recorded in advance and a data area 3 in which data is recorded. The brush area 4 may be located anywhere on the optical disk 1 (a plurality of brush areas may be provided), but it must be provided at a predetermined position with respect to the ID area 2 and the data area 3. Here, as an example, an optical disc having a brush area 4 instead of one ID area 2 will be described. The brush 5 in the brush area 4 contacts the surface of the objective lens under the focus control as shown in FIG. 2, and the surface of the objective lens 6 is cleaned by the rotation of the optical disk 1.

FIG. 3 is a block diagram of an optical disk device according to the present invention. In the figure, 11 is an optical pickup, 12 is a reproduction signal detection circuit, 13 is a synchronizing circuit, 14 is a reproduction signal demodulation circuit, and 15 is a timing generation circuit. Reference numeral 16 is a servo signal detection circuit, 17 is a servo circuit, and 18 is a lens drive mechanism. From the reflected light detected by the optical pickup 11, the reproduction signal is detected by the reproduction signal detection circuit 12, and the servo signal is detected by the servo signal detection circuit 16.
The output of the reproduction signal detection circuit 12 becomes reproduction data by the synchronization circuit 13 and the reproduction signal demodulation circuit 14. On the other hand, the servo signal detected by the servo signal detection circuit 16 is transmitted via the servo circuit 17 to the lens driving mechanism (actuator) 1
8, the lens is driven and servo control is performed.

The timing generation circuit 15 generates the ID area signal (c) and the brush area signal (d) in FIGS. 4A to 4D from the output of the synchronization circuit 13. I
The D area signal is a timing signal indicating the ID area 2, and the brush area signal is also a timing signal indicating the brush area 4. Since the brush area 4 is provided at a predetermined position with respect to the ID area 2 and the data area 3 as described above, the generation timing can be specified similarly to the ID area signal.

This brush area signal is connected to the servo circuit 17, and the servo is turned off in the brush area 4 as shown in FIG. Since the width of the brush area 4 is about the same as that of the ID area 2, when the optical disk having a diameter of 90 mm is rotated at 1800 rpm, the time for the light spot to pass through the brush area 4 is about 0.1 msec. The servo does not come off even if the switch is turned off. In this way, even if a normal servo signal cannot be obtained in the brush area 4, the servo can be released and information can be recorded and reproduced. Actually, the optical disk (cleaning disk) 1 and the optical disk device are used to record and reproduce signals, and determine the cleaning effect based on the reproduced signals.

FIG. 5 is a diagram showing another embodiment of the optical disk according to the present invention. The brush area 4 may be provided in a part of the radius of the disc 1. In this case, brush area 4
The other parts can be used as an ordinary recordable / reproducible optical disk, and when the recording / reproducing ability is deteriorated due to the dirt of the lens, the recording / reproducing ability can be improved by accessing the brush area 4. Also, the degree of improvement can be confirmed.

[0014]

As is apparent from the above description, the present invention has the following effects. (1) In the optical disk for lens cleaning according to claim 1, since the brush is provided at a predetermined position with respect to the area where the address information is recorded, the area where the brush is provided by the optical disk recording / reproducing apparatus. Can be specified and the servo control can be turned off in this area, so that information can be stably recorded / reproduced on / from the lens cleaning optical disk. Further, since the optical disc provided with the brush is an optical disc capable of recording and / or reproducing information, the lens cleaning effect can be confirmed by recording the information. In general, the deterioration of the characteristics when the lens becomes dirty is more remarkable in the recording characteristics than in the reproduction characteristics, so that the lens cleaning effect can be detected with higher accuracy than before. (2) In the optical disk device according to the second aspect, since the servo control is turned off in the area where the brush is provided, information can be stably recorded / reproduced on / from the lens cleaning optical disk. Since the disc provided with the brush is a disc capable of recording and / or reproducing information, the lens cleaning effect can be confirmed by recording the information. In general, the deterioration of the characteristics when the lens is dirty is more remarkable in the recording characteristics than in the reproduction characteristics, so that the lens cleaning effect can be detected more accurately than in the past. (3) In the optical disk device according to claim 3, the information is recorded in an area other than the area where the brush is provided, and the recorded information is reproduced to detect the cleaning degree of the objective lens. The cleaning effect can be confirmed by recording the information. In general, the deterioration of the characteristics when the lens is dirty is more remarkable in the recording characteristics than in the reproduction characteristics, so that the lens cleaning effect can be detected more accurately than in the past.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of an optical disc according to the present invention.

FIG. 2 is a diagram showing a relationship between an optical disc, a brush and an objective lens according to the present invention.

FIG. 3 is a block diagram of an optical disc device according to the present invention.

FIG. 4 is a diagram showing a signal waveform of each part in FIG.

FIG. 5 is a diagram showing another embodiment of the optical disc according to the present invention.

FIG. 6 is a diagram showing a conventional lens cleaning optical disc.

[Explanation of symbols]

1 ... Optical disc, 2 ... ID area, 3 ... Data area,
4 ... Brush area.

Claims (3)

[Claims] 1. Dividing into predetermined information units,
Address information indicating the addresses of the divided areas is recorded and / or reproduced optically in advance, and a fibrous brush is provided on one surface and a surface facing the objective lens. In an optical disc that cleans the surface of the objective lens by bringing the brush light into contact with the objective lens during rotation, the brush is radiated along a radial direction at a predetermined position with respect to the area in which the address information is recorded in advance. An optical disc characterized by being provided with. 2. An optical disk apparatus for recording / reproducing information using the optical disk according to claim 1, a control means for performing tracking control and / or focusing control of a light spot by reflected light of the optical disk, address information and recording. Information reading means for reading the stored information, synchronizing means for synchronizing the clock of the output of the information reading means, generating means for generating a timing signal indicating the area where the brush is provided from the output of the synchronizing means, and the generating means. An optical disk device, characterized in that the tracking and / or focusing control is turned off according to the output of the means. 3. The objective lens is obtained by cleaning the surface of the objective lens in the area provided with the brush, recording the area other than the area provided with the brush, and reproducing the recorded information. 3. The optical disk device according to claim 2, wherein the cleaning degree of the optical disk is detected.