JPH0773494A - Lens cleaner for optical pickup - Google Patents

Abstract

PURPOSE:To prevent cleaning from being interrupted due to a burst error in an attaching part of a wiping body, to relax the limitation of the thickness of the wiping body and to facilitate the mounting of it on a disk in a lens cleaner for an optical pickup of a type of brushing off a foreign matter on a lens surface with the wiping body such as a brushing bristles. CONSTITUTION:An extended read-in area 4 is provided continuously to the end of the read-in area 3. A total width size W of both read-in areas 3, 4 in the radial direction is made at least the same size as the radius of a pickup lens 6. The wiping body 2 such as a brushing bristles bundle is provided in the extended read-in area 4, and the burst error occurring in the attaching part is ignored similarly to the read-in area 3.

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 As a prior art of this type of lens cleaner, there is JP-A-2-232878, in which brush bristles are dispersed and planted in a spiral row outside the lead-in area, that is, in the program area. ing. In this way, by disposing the bristles of brushes in a dispersed manner, the operation resistance due to the bristles when the pickup performs the focusing operation can be reduced. Further, it is possible to suppress the forcible stop of the rotation of the disk during cleaning by reducing the amount of missing signal at the time of burst error that occurs at the location where the brush bristles are planted.

[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 bristles 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 hair remains when stored and stored, so the amount of missing signal 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 brush thinner. However, even with the conventional hair bundle thickness, it takes time and effort to plant the hair bundle, and if the hair bundle is made thinner, the planting work will be even more difficult and the production of the lens cleaner will be inevitable. High cost. 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 (Table of Contents) are repeatedly recorded therein as management information for 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 all the reproducing operations are stopped.

The present inventor has focused on the above-described control mode peculiar to the lead-in area and has considered providing a wiping body such as a bristles of brushes there. This is because the wiping body can be formed to be thick and large if the random error and the burst error do not pose 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 attaching to the disc.

[0007]

According to the present invention, in a lens cleaner in which a wiping member 2 for cleaning is fixed to a disc surface of a disc 1, TOC information is recorded on a signal recording surface of the disc 1 in order from an inner peripheral surface. The predetermined lead-in area 3 and the expanded lead-in area 4 are provided, and the total width dimension W of both lead-in areas 3 and 4 in the radial direction is equal to the radial dimension R of the pickup lens 6. It is characterized in that it is set to the same value or more, and that the wiping body 2 is arranged within the set range of both lead-in areas 3 and 4. Specifically, a plurality of wiping bodies 2 are arranged in a dispersed manner in both lead-in areas 3 and 4.

[0008]

When the extended lead-in area 4 is provided continuously to the predetermined lead-in area 3 in which TOC information is recorded,
The optical pickup 5 continuously reads the signals in the lead-in areas 3 and 4. Both lead-in areas 3 at this time
If there is a burst error in 4 that exceeds the allowable amount of missing signal, it is ignored. Therefore,
Even if the large wiping member 2 is arranged in both the lead-in areas 3 and 4, the reading operation of the optical pickup 5 is not hindered. When the total radial width W of both lead-in areas 3 and 4 is at least equal to the radial dimension R of the pickup lens 6, the lens center is expanded from the innermost circumferential position of the lead-in area 3. Since it moves radially to the outermost position of 4, the entire surface of the pickup lens 6 can be cleaned by the wiping member 2 during that time. As described above, in the lead-in areas 3 and 4, even if the burst error exceeding the limit amount is ignored, the wiping member 2 should be thicker or thicker within the range where the focusing operation of the optical pickup 5 is not hindered. Can be formed large.
The thicker and larger the wiping body 2 is, the easier the attachment 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 total width dimension W of both lead-in areas 3 and 4 in the radial direction is determined by the radial dimension R of the pickup lens 6. By setting the same or more than the above and providing the wiping body 2 in these lead-in areas 3 and 4, it is possible to ignore the burst error generated at the mounting position of the wiping body 2. Therefore, even if the missing signal amount due to the provision of the wiping member 2 exceeds the allowable value, the cleaning operation is not interrupted and the optical pickup 5
Can be moved from the inner edge of the lead-in area 3 to the outermost circumference of the extended lead-in area 4 without any trouble, and the entire surface of the pickup lens 6 can be reliably cleaned during that time. 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 do not become excessive. Therefore, as compared with the conventional lens cleaner, the wiping member 2 can be easily attached to the disc 1, and the assembling cost can be reduced and the manufacturing cost of the lens cleaner can be reduced accordingly.

[0010]

1 to 3 show a first embodiment of a lens cleaner according to the present invention. In FIG. 1, the lens cleaner includes 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 expanded lead-in area 4 are provided in order from the inner peripheral side.
The signal track is formed only in the area. 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 total width W of both lead-in areas 3 and 4 in the radial direction is the radius R of the pickup lens 6 (see FIG. 3).
(See) and set it to the same value or higher. In this embodiment, when the lens diameter of the pickup lens 6 is about 6 mm, the radial width of the lead-in area 3 is set to a predetermined value of 2 mm according to the standard, and the radial width of the expanded lead-in area 4 is set to 8 mm. did. In the expanded lead-in area 4,
Information of the same signal format as that of the lead-in area 3 is repeatedly recorded from the inner circumference start end to the outer circumference end. This is because the lead-in area 3 is continuously read by the optical pickup 5 (see FIG. 3) so that the extended lead-in area 4 can be reliably crossed by the optical pickup 5.

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 radially outer side 1
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 very 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 signals recorded therein from the inside of the lead-in area 3 to the outside thereof. However, even after the TOC information has been read in the lead-in area 3, information is recorded in the lead-in area 4 that has been expanded subsequently, as in the case of the lead-in area 3, so that the optical pickup 5 continues. The lead-in area 4 to the outer peripheral edge of the expanded lead-in area 4. Depending on the manufacturer, there is a CD player that reads the TOC information as soon as the cleaner is completely loaded without operating the play button.

While the pickup lens 6 moves through the expanded 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, the expanded lead-in area 4 is similar to the specified lead-in area 3 in TO
Since the C information is repeatedly recorded, the CD player cannot distinguish between the areas 3 and 4, and the expanded lead-in area 4 ignores the burst error as in the lead-in area 3. Therefore, even though the wiping body 2 has a large diameter at the base end portion of 0.7 mm, the reading movement of the recorded information is not interrupted at the planting portion of each wiping body 2.

(Other Embodiments) FIGS. 4 and 5 show other different embodiments 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, the wiping body 2 can be handled as one part by fixing a group of brush bristles to the base sheet or the base block in advance. , 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 and 4B, the 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 foam rubber in the shape of 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 lump, and the forming material and arrangement form thereof can be freely changed as necessary. The radial width 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. Further, although the above-described embodiment has been described as a cleaner-dedicated disc, a lead-in area of a normal CD, LD (laser disc), electronic file disc, or the like is expanded, and a CD with a cleaning function or the like 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 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 cross-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 predetermined lead-in in which TOC information is recorded on a signal recording surface of the disk 1 in order from an inner peripheral surface. The area 3 and the expanded lead-in area 4 are provided, and the total width dimension W of the lead-in areas 3 and 4 in the radial direction is
The lens cleaner for an optical pickup is characterized in that the radius dimension R of the pickup lens 6 is set to be equal to or larger than the radius dimension R, and the wiping body 2 is arranged within the set range of the 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.