JPS61126647A - Flaw eliminating device of optical disc - Google Patents

Abstract

PURPOSE:To read accurately recorded signals in the state where an optical disc has no flaws, by rotating a polishing member relatively to the surface of the optical disc and polishing the surface of the optical disc to eliminate flaws. CONSTITUTION:An upper case 16 is opened, and a compact disc 1 is placed on a turntable 11 so that the surface of flaws is turned up, and the case 16 is closed, and a polishing element 6 is brought into contact with this surface, and a power switch 14 is turned on to rotate a motor 13 for a certain time. The rotation of the motor 13 is trnasmitted by gears 12a-12g to rotate the table 11 and the element 6 of a polish plate 18. By this rotation, the element 6 itself is rotated, and the table 11 is rotated to rotate the disc 1, and the polishing element polishes all of the surface of the disc 1. Thus, flaws on the disc 1 are eliminated, and recorded signals are read out accurately in this state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for removing scratches from optical discs such as compact discs and video discs, which reads out signals by reflecting light.

[Conventional technology]

Optical discs such as conductor discs and video discs that read signals by reflecting light have been put into practical use in recent years. FIG. 5 is a diagram showing a cross section of a compact disc as an example of these optical discs. The compact disc (1) has a base (2) made of a transparent synthetic resin such as I-licargonate resin. One side of (2) has a concave-convex button on which a signal is recorded. This base (2)
A reflective layer (3) is formed on the surface where the signal is recorded,
Furthermore, a protective body (4) such as a label is attached from above. With this configuration, light is irradiated from the surface of the substrate (2) on which signals are not recorded, and after reading the light reflected from the reflective layer (3), it is converted into an electrical signal by an optical-electrical converter. Convert and read the signal.

Here, when an island is formed on the surface (5) of the base (2),
Depending on the condition of the scratch, the signal may be read out incorrectly. In other words, if the change in the incidence and output of the signal reading light on the substrate (2) due to scratches is such that it cannot be read correctly, errors or omissions in the read signal may occur, and in the worst case, the disc may not be usable. It becomes impossible.

For this reason, in the past, some kind of compensation circuit was provided in the signal readout circuit of the reproducing device, and when an error or omission of the readout signal occurred, the correct signal was estimated from the previous and subsequent signals, etc., and compensated.

[Problem that the invention seeks to solve]

However, the compensation by the compensation circuit described above has a limit because it can be estimated from the preceding and following signals, etc., and it cannot be said that complete compensation is always achieved, and compensation is impossible when the damage is widespread. There was an inconvenience. In view of these points, it is an object of the present invention to solve the problem that it is not possible to completely compensate for errors or missing signals on optical discs where scratches occur on the surface and signals cannot be read correctly.

Means for Solving Problem C] In order to solve the above-mentioned problems, the optical disc scratch removal device of the present invention has a table α force on which the optical disc (1) can be placed, and a table (rotation) on which the optical disc (1) can be placed. ) on the optical disc (
The polishing element (1) rotates relative to the surface of the polishing element (1) while being in contact with the surface of the optical disc (1).
) Scratches on the optical disc (1) are polished by relative rotational movement of the surface.

[Effect]

According to the optical disc scratch removal device of the present invention, the polishing element (a) polishes the surface of the optical disc (1) by rotating it relative to the surface of the optical disc (1), Since the scratches generated on the surface of the optical disc (1) are removed, the optical disc (1) becomes scratch-free and recorded signals can be read out accurately.

〔Example〕

Hereinafter, one embodiment of the optical disk scratch removal apparatus of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a longitudinal sectional view of the entire optical disk tin removal apparatus. In the center of the main body αQ of this scratch removal device, a turntable αQ on which an optical disc (1) can be placed is rotatably arranged and detachably attached using a screw. A groove (l1m) is provided on the back surface of the turntable α-yu along the entire circumference, and a protrusion (e) that loosely fits into this groove (lia) is provided around the main body α1 side.
There is. Furthermore, a groove (6) is provided all around the outer periphery of the turntable (b) of the main body. This turntable α is connected to gears (12m), (12b), (12c), (12d) from a motor (6) fixed inside the main body α1.
It is driven through and rotates. The upper case αQ above the turntable αη is connected to the main body αQ via a hinge α force and can be opened and closed. Gears (12f), (12g), and (12h) are housed inside the upper part of the upper case αQ, and when the upper case α is closed, the gears (12f), (12g), and (12h) are placed on the same axis as the output shaft of the motor α→ on the main body αQ side. Gear (12e) installed on top
) and the gear (12f) on the upper case αQ side mesh with each other. Furthermore, the upper case αQ has a gear (12f) and a gear (12h).
) A polishing plate (to) is attached to the same axis with a screw (a), and both polishing plates α have their tip surfaces aligned with the turntable α■ when the upper case (IQ) is closed. They are located opposite to each other with a slight gap less than the thickness of the compact disc (1).A disc-shaped polishing element (6) can be attached to the tip surface of the polishing plate α frame. The rotation of the motor (6) is controlled by the electric control section (g) inside the main body α1 and the power switch negative ◆ on the outside of the main body α1, and when the power switch α4 is turned on, the motor (6) rotates for a certain period of time. 6) rotates, the turntable αρ and the polishing plate α frame are rotated by transmission through each gear.

Next, we will explain the structure of the polishing element (6) attached to the tip of the polishing plate (1 barrel). Figure 2 is a longitudinal cross-sectional view of the polishing element (6), which has a hollow disk shape as a whole. , sandpaper, etc. polishing elements (
It consists of four layers: (7) (9), double-sided adhesive tape (8), and release paper (7) for double-sided adhesive tape (8). Then, when attaching the polish element (6) to the tip surface of the polish spray (11), peel off the release paper (7) and then adhere it using the double-sided adhesive tape f (8).

Here, the thickness of the 4 recycle elements (6) is determined by the polishing element on the surface of the 1 compact disc (1) when the optical disc, for example, the conduct disc (1) is placed on the turntable (11). The thickness is set so that the polishing element (a) of (6) comes into contact with it, and the diameter is approximately the same size as the radius of the compact disc (1).

The optical disk scratch removal device of this embodiment is constructed as described above, and its operation will be described below.

First, open the upper case αQ and then remove any scratches from the turntable α or the top disc (11
) or other optical disc. At this time, the scratched surface, ie, the surface (5) of the base (2), should be the top surface. Then, close the upper case αQ and connect the disc α■
The polishing element (c) of the polishing element (6) is brought into contact with the surface (5) of K. In this state, turn on the blower switch α4 and rotate the motor for a certain period of time.

When the motor (to) rotates, each gear ° (12a) ~ (1
Polishing element (6) attached to turntable α■ and polishing grate (to)
) rotates. This rotation causes the polishing element (
6) Since the turntable αno also rotates while the turntable itself rotates, the contact disc (1) rotates and the polishing element (goods) touches the surface (5) of the contact disc (1).
Polish the entire surface. Figure 3 shows a compact disc (1
) is a diagram showing how the polishing element (6) rotates on the surface (5) of the polishing element (6) and the contact disc (1) as shown.

By rotating and polishing the surface (5) of the compact disc (1) as described above, the surface (5) is scraped off while maintaining its smoothness, and the scratches can be removed by scraping to the depth of the scratches. I can do it. In this embodiment, the motor stops rotating after a certain period of time, so if the thickness to be removed in one operation is insufficient, the motor can be rotated again. However, the maximum thickness that can be created is such that the base (2) can maintain the strength of the disc; for example, in the case of a compact disc, the maximum thickness that can be scraped is about 0.5 mm. When the disk (1) is scraped off as described above, scraping residue is generated, but the groove (l) along the outer periphery of the back surface of the turntable (b)
id) and the protrusion ■ on the main body αO side prevent the cutting residue from infiltrating the back surface of the tar/table α°C, and collect the cutting residue in the groove α along the outer periphery. Furthermore, in the event that the cutting residue infiltrates the back surface of the turntable (B), the cutting residue can be easily cleaned by removing the turntable α using the screw (2). Also, when polishing, since the base (2) is made of synthetic resin,
If the rotational speed of the turntable α and the polishing element (6) is set too high, the disk may be deformed by the heat generated during polishing, so it is necessary to select a rotational speed that does not cause thermal deformation. For this reason, in this embodiment, the gear (1
The rotational speed of the turntable (b) is reduced by increasing the reduction ratio of 2a), (12b), and (12c)h (12d).

In the above explanation, the case where the scratch removing device of the present invention is used for removing scratches has been explained, but by replacing the polishing element, it is also possible to remove dirt from the surface of an optical disc. Figure WI4 is a diagram showing six polishing elements (6) used for removing dirt.
The thickness of the Fell is increased by 9 mm to compensate for this. These polishing elements (six of them are attached in advance to a polishing plate (to) different from the polishing plate α to which the polishing elements (6) described above are attached, and the entire polishing plate (11) is replaced. Element (6 pieces of felt (9 pieces) polish the surface of the optical disc and remove dirt. At this time, felt) (9 pieces)
') is impregnated with a cleaning liquid, etc., to increase the dirt removal effect. Incidentally, polishing can be done more efficiently by performing this dirt removal before and after the polishing work described above, and when performing the polishing work, the two polishing plates should be cleaned at the same time.
By using a polishing element (6) with a polishing element 4 on one side and a polishing element (69) with a felt (9') on the other side, polishing can be performed while removing scraping residue, dirt, etc.

It should be noted that although the case of a Konjacto disc has been described as an example of an optical disc, the above-described scratch removal device can also be applied to other optical discs such as an optical video disc. Further, the present invention is not limited to the above-mentioned embodiments,
Various other configurations may be taken without departing from the gist of the invention.

〔Effect of the invention〕

According to the optical disc scratch removal device according to the present invention, the polishing member has a table on which an optical disc can be placed, and a polishing element that rotates relatively while being in contact with the surface of the optical disc on the table. The scratches generated on the optical disk surface are removed by polishing the optical disk surface by the relative rotational movement of the optical disk surface, so the optical disk can be made scratch-free by using the scratch removal device of the present invention. Therefore, accurate signal reading is possible without using the compensation circuit of the playback device, and the scratch removal device of the present invention can be used even when there is a scratch that is such that the signal cannot be compensated by the compensation circuit. By doing so, it can be left in a scratch-free state, and accurate signal reading becomes possible.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing an embodiment of the optical disc scratch removal device of the present invention, Fig. 2 is a sectional view showing an example of a polishing element for polishing, and Fig. 3 is a polishing operation. FIG. 4 is a sectional view showing an example of a polishing element for stain removal, and FIG. 5 is a sectional view showing an example of a concavity disc. (1) is the con-guct disk, (6) is the I-rich element, αQ is the main body, α force is the turntable, (1mu)
, (12b).

Claims (1)

[Claims] It has a table on which an optical disk can be placed, and a polishing element that rotates relative to the surface of the optical disk on the table while being in contact with the surface of the optical disk, and the polishing element rotates relative to the surface of the optical disk. A scratch removal device for an optical disc, characterized in that it polishes scratches on the optical disc.