JPH05159339A - Lens cleaner for optical pickup - Google Patents

Abstract

PURPOSE:To prevent cleaning from being interrupted by burst error at the fitting part of a wiper, to relax the limit of the thickness of the wiper and to facilitate assembly to a disk concerning the lens cleaner for optical pickup in a form to wipe off a foreign matter on the surface of a lens by the wiper of brush bristles or the like. CONSTITUTION:Continuously to the terminal of a lead-in area 3, an extended lead-in area 4 repeatedly recording TOC information is provided. The diameter direction width of the extended lead-in area 4 is made equal to the diameter of a pickup lens 6 at least. A wiper 2 of brush bristles or the like is provided in the extended lead-in area 4 so as to ignore the burst error generated at the fitting part similarly to the lead-in area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens cleaner for cleaning a pickup lens of an optical pickup, and more particularly to a lens cleaner for removing foreign matters such as adhesive substances and dust adhering to the lens surface.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 2-232878 is known as a prior art of this type of lens cleaner. Where,
Outside the lead-in area, that is, in the program area, the brush bristle bundles are dispersed and planted in a spiral row. in this way,
By disposing the bristles of brushes in a distributed manner, it is possible to reduce the operation resistance due to the bristles when the pickup performs the focusing operation. Further, it is possible to reduce the amount of missing signal at the time of burst error that occurs at the location where the brush bristles are planted, and to prevent the rotation of the disk from being forcibly stopped during cleaning.

[0003]

SUMMARY OF THE INVENTION In the above lens cleaner, in order to keep the missing signal amount at the time of burst error within a recoverable range, the diameter of the bristles of the brush bristle is 0.4 to 0.5.
It was mm. However, the brush bristles spread out toward the tip in a scattered manner, and the shape of the brush bristles remains during storage and storage, so the missing signal amount may exceed the allowable range.
Depending on the model of the disc player, cleaning may not be performed reliably. The rotation of the disc was forcibly stopped during cleaning.
If an audio signal is recorded in the program area, it may cause playback defects such as skipped sounds or track jumps. The only way to avoid this situation is to make the bristles of bristles even thinner. However, even with the conventional hair bundle thickness, it takes time and time to plant the hair bundle, and if the hair bundle is made thinner, the planting work will be more difficult, and the cost of manufacturing the lens cleaner will be increased. Is expensive. The same problem occurs when using a wiping body other than brush bristles.

By the way, in the lead-in area, burst error does not matter. Contents of TOC (Toble of Contents) are repeatedly recorded therein as management information of performance programs and the like, and random errors or burst errors are controlled to be ignored until the recorded contents are completely read. Because. However, if reading is tried several times and the recorded contents are still incomplete, it is considered that the disc is defective, and the entire reproducing operation is stopped.

The present inventor has focused on the above-mentioned control mode peculiar to the lead-in area and has considered providing a wiping body such as a bristles of brushes therein. This is because the wiping body can be formed to be thick and large unless the random error or the burst error is a problem. However, in this case, I noticed that the entire surface of the pickup lens could not be cleaned. This is because the lead-in area has a width of only 2 mm, while the lens diameter is around 6 mm, so that the entire lens surface cannot be wiped even if the signal is read repeatedly.

Therefore, an object of the present invention is to extend the lead-in area to the side of the program area and provide a wiping member there to eliminate the interruption of cleaning caused by a burst error, and at the same time, to wipe the wiping member. The purpose is to relax the restriction on the thickness and improve the workability of attachment to the disc.

[0007]

In the lens cleaner of the present invention, the wiping member 2 for cleaning is fixed to the disk surface of the disk 1, and the TOC information is repeatedly recorded continuously in a predetermined lead-in area 3. It is required that the extended lead-in area 4 is provided and the wiping body 2 is arranged in both the lead-in areas 3 and 4. More specifically, a plurality of wiping bodies 2 are arranged in a dispersed manner in both lead-in areas 3 and 4.

[0008]

If the TOC information is repeatedly recorded in the extended lead-in area 4 continuously with the TOC information in the predetermined lead-in area 3, the extended lead-in area 4
If the optical pickup 5 can be moved to the outermost circumference of the line and there is a burst error exceeding the allowable amount of missing signal during that time, it can be ignored. Therefore, the wiping body 2 can be formed thick or large within a range that does not hinder the focusing operation of the optical pickup 5. The thicker and larger the wiping body 2 is, the easier the attachment work to the disc 1 is.

[0009]

According to the present invention, an extended lead-in area 4 is provided adjacent to the lead-in area 3, and the wiping body 2 is provided in these lead-in areas 3 and 4, so that the wiping body 2 is attached at a mounting position. Made it possible to ignore burst errors. Therefore, even if the missing signal amount due to the provision of the wiping member 2 exceeds the allowable value, the cleaning is not interrupted and the optical pickup 5 can be moved to the outermost periphery of the extended lead-in area 4 without any trouble. , The lens surface can be reliably cleaned. further,
The wiping body 2 can be made thick and large within a range in which the operating resistance when the optical pickup 5 performs the focusing operation and the sliding contact resistance when the wiping body 2 contacts the pickup lens 6 are not excessive. As compared with the conventional lens cleaner, the wiping body 2 can be easily attached to the disk 1, and the assembling cost can be reduced accordingly, and the manufacturing cost of the lens cleaner can be reduced.

[0010]

1 to 3 show a first embodiment of a lens cleaner according to the present invention. In FIG. 1, the lens cleaner comprises a disc 1 having substantially the same specifications as a compact disc (hereinafter referred to as a CD), and a plurality of wiping bodies 2 attached to the signal reading surface side thereof.

On the signal recording surface of the disc 1, a lead-in area 3 and an extended lead-in area 4 are arranged in order from the inner circumference side.
Are provided, and signal tracks are formed only in both areas 3 and 4. That is, the outer peripheral portion of the expanded lead-in area 4 is merely a mirror surface. Of course, if an audio signal or a video signal is recorded in the program area like a normal CD, the sound or the video can be reproduced after cleaning. The radial width of the lead-in area 3 is set to a predetermined value of 2 mm as specified, and the radial width of the expanded lead-in area 4 is set to 8 mm. In the extended lead-in area 4, the TOC recorded in the lead-in area 3 is recorded.
Repetitive information of information is repeatedly recorded from the inner end to the outer end. This is lead-in area 3
This is because the signal is read continuously by the optical pickup 5 (see FIG. 3) so that the optical pickup 5 can reliably cross the extended lead-in area 4.

In the expanded lead-in area 4, four wiping bodies 2 are dispersedly arranged. As shown in FIGS. 1 and 2, from the outer edge of the lead-in area 3 to the outer side 1 in the radial direction.
The first wiping body 2 is arranged at a position separated by mm, and thereafter, the wiping bodies 2 are separated by 2 mm in the radial direction, and further four pieces in a state where the minimum adjacent distance in the circumferential direction is the same as the diameter dimension of the pickup lens 6. The wiping bodies 2 of No. 1 were arranged in a spiral row. Each wiping body 2
Consists of a bunch of dozens of extremely fine brush bristles having a diameter of 40 μm to 80 μm. As shown in FIG. 2, one end of the bunch of hair is inserted into the planting hole 7 provided in the disc 1 and the insertion end is made into a hole. It is bent radially at the periphery and fixed with tape 9. The outer surface of each tape 9 is collectively covered with a donut-shaped label 10. In this fixed state, the wiping member 2 projects 3.0 mm from the disc surface of the disc 1. The diameter of the planting hole 7 was 0.7 mm.

The lens cleaner constructed as described above is
C with the cleaning liquid contained in the innermost wiping member 2
Load it in the D player. When the play button is operated in this state to enter the reproduction mode, the optical pickup 5 reads the signal recorded therein from the inside of the lead-in area 3 toward the outside. However, even after the TOC information has been read in the lead-in area 3, the TOC information is recorded in the lead-in area 4 which has been expanded continuously. Therefore, the optical pickup 5 continuously moves in the radial direction and expands. The lead-in area 4 moves to the outer peripheral edge. Depending on the manufacturer, it may not be necessary to operate the play button and the T
Some CD players read OC information.

While the pickup lens 6 moves through the extended lead-in area 4, it first comes into contact with the wiping body 2 containing the cleaning liquid, and then comes into contact with the three wiping bodies 2 in a dry state one after another. Therefore, not only dust and dirt adhering to the lens surface can be removed, but also hard-to-remove foreign matter such as cigarette smoke is surely removed to restore the lens surface to a clean state. A large amount of signals are missing at the location where the wiping body 2 is planted. However, since the TOC information similar to that of the lead-in area 3 is repeatedly recorded in the expanded lead-in area 4, the CD player side cannot distinguish both areas 3 and 4, and the expanded lead-in area 4 In the same manner as in the lead-in area 3, burst errors are ignored. Therefore, even though the base end diameter of the wiping body 2 is as thick as 0.7 mm, the reading and moving movement of the recorded information is not interrupted at the planting portion of each wiping body 2.

(Other Embodiment) FIGS. 4 and 5 show another embodiment of the present invention in which the form of the wiping member 2 is changed. The wiping body 2 in FIG. 4 is formed by collectively arranging a group of brush bristles in a straight line in one place in the expanded lead-in area 4. In this way, when the wiping bodies 2 are collectively arranged in one place, by fixing a group of brush bristles to the base sheet or the base block in advance, the wiping bodies 2 can be handled as one part. , The disc 1 can be easily assembled. Also, FIG.
Although the wiping member 2 is provided in the expanded outer lead-in area 4 in each of the embodiments shown in FIGS. 4A to 4C, planting may be started from a predetermined inner lead-in area 3, and one of the lead-in areas 3 and 4 may be started. It is sufficient to leave a normal track in the section that has not been divided by the planting section.

The wiping member 2 shown in FIG. 5 is made of foamed rubber as a brush and is particularly suitable for impregnating with a cleaning liquid. That is, when the wiping body 2 is formed of foamed rubber, the cleaning liquid is impregnated inside the wiping body 2, so that the cleaning liquid can be reliably applied to the entire surface of the lens.

In addition to the above, the wiping body 2 may be formed of a cloth piece, leather, or a felt-like fiber mass, and its forming material and arrangement form can be freely changed as necessary. The radial width dimension of both lead-in areas 3 and 4, that is, the dimension from the innermost circumference of the predetermined lead-in area 3 to the outermost circumference of the outer lead-in area 4 is at least about half the diameter of the pickup lens 6. Of course, if necessary, the width can be set beyond the width dimension shown in the embodiment. Although the above-described embodiment has been described as a cleaner-dedicated disk, the lead-in area of a normal CD, LD (laser disk), electronic file disk, or the like is expanded, and a CD with a cleaning function is provided by implementing the present invention. It is also possible.

[Brief description of drawings]

FIG. 1 is a plan view of a lens cleaner showing an arrangement structure of a wiping member.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an explanatory diagram showing a usage state of a lens cleaner.

FIG. 4 is a plan view showing another embodiment in which the arrangement of the wiping body is changed.

FIG. 5 is a sectional view showing another embodiment in which the structure of the wiping member is changed.

[Explanation of symbols]

 1 disc 2 wiping body 3 lead-in area 4 expanded lead-in area 6 pickup lens

Claims (2)

[Claims] 1. A lens cleaner in which a wiping member 2 for cleaning is fixed to a disk surface of a disk 1, and a lead-in area 4 which is obtained by repeatedly recording TOC information continuously in a predetermined lead-in area 3 and expanding the same. A lens cleaner for an optical pickup, characterized in that the wiping member 2 is arranged within the range of both lead-in areas 3 and 4. 2. The lens cleaner for an optical pickup according to claim 1, wherein a plurality of wiping bodies 2 are arranged in a distributed manner in both lead-in areas 3 and 4.