JPH103700A - Method for damaging optical disk with metallic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable degrading an optical disk, to efficiently perform damaging and to simplify re-resource forming by irradiating an electromagnetic wave onto the optical disk with a metallic film and destroying the metallic film. SOLUTION: The optical disk 2 to be degraded is arranged on an electromagnetic wave irradiative position from an electromagnetic wave generator 1. A case 3 placed on a transition means 4 is moved successively to the electromagnetic wave irradiative position of the electromagnetic wave generator 1, and is irradiated by the electromagnetic wave for a prescribed time, and thereafter, the case 3 is thrown down to its collection part to be collected. Therefore, the degradation is performed for the optical disk with the metallic film by destroying the metallic film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making an optical disk having a metal film defective, and more particularly, to an optical disk having this metal film without destroying the metal film without removing the optical disk from a container such as a disk case or a cardboard box. The present invention relates to a method of defecting an optical disk having a metal film capable of performing the defect of the optical disk by using the method.

[0002]

2. Description of the Related Art When an optical disc such as a CD (compact disc) is recovered due to unsold or returned goods, it is desirable to reuse these optical discs as resources.
If taken out, there is a risk of unauthorized use or sale.

[0003] Therefore, these recovered optical disks are
It is desired that the product is rejected, that is, rejected as soon as possible so that it cannot be used or sold. However, the optical discs that are usually collected are stored in a case and further packed in cardboard or the like. As described above, taking out the optical discs housed in a housing such as a cardboard box or a case and making them defective has a remarkably low workability, and the cost for recycling is enormous.

In order to solve this problem, a method is usually adopted in which a cut is made by a rotary saw while being stored in a cardboard or the like. In other words, according to this method, the optical disk is cut along with papers such as a manual while the label is still attached. For this reason, sawdust such as paper materials and different types of plastic materials adhered to or attached to the cuts and surfaces of the disc substrate and the case, etc., may hinder the recycling of the material, or may be a complicated process for removing the sawdust. There are problems such as requiring work.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method of labeling an optical disk, particularly when an optical disk having a metal film is made defective, without generating or adhering scraps or adhesion of paper materials, dissimilar plastic materials and the like. Etc. are stuck,
Alternatively, the metal film of the optical disk can be broken and the optical disk can be made defective without taking out the optical disk from a container such as a plastic case or cardboard while the printed optical disk is still being printed. And simplify resource and resource recycling.

[0006]

According to the present invention, an optical disk having a metal film is irradiated with an electromagnetic wave to destroy the metal film.

As described above, in the method of the present invention, the metal film is selectively destroyed by irradiating an electromagnetic wave, and by doing so, the optical disk, the case, the cardboard are cut by a saw or the like as in the conventional method. As compared with the case of cutting, etc., handling of the optical disk after the remarkable failure becomes easier, and the work in the case of reusing resources by, for example, peeling off a label or the like is simplified.

[0008]

Embodiments of the present invention will be described with reference to the drawings. In the present invention, an optical disk having a metal film, for example, an Al metal film that constitutes a light reflection film that performs reading of recorded information by laser light or the like, detecting light interference due to light interference, or Kerr effect, etc. A defective optical disk is made by breaking its metal film. That is, in the present invention, the optical disk to be made defective is irradiated with electromagnetic waves. Irradiation of this electromagnetic wave is carried out in a state where a label or the like is stuck to the optical disk, or in a state where the optical disk is further housed in a housing, that is, in a state where the optical disk is housed in a plastic disk case, or in some cases, The electromagnetic wave is irradiated while the optical disk or the disk case containing the optical disk is further housed in a housing such as a cardboard.

FIGS. 1 and 2 are a schematic plan view and a schematic sectional view of an example of an apparatus for carrying out the method of the present invention. In this apparatus, an electromagnetic wave generator 1 is provided. And
The optical disk 2 to be subjected to the defect processing is arranged at the position where the electromagnetic wave is emitted from the electromagnetic wave generator 1. 1 and 2
5 shows a case where the optical disk 2 is irradiated with electromagnetic waves in a state of being housed in the plastic case 3. 1 and 2, a transfer means 4 such as a belt conveyor is provided, and a supply unit 5 for feeding the case 3 containing the optical disk 2 is provided therein. The supply unit 5 is configured such that the mounting unit 6 in which the cases 3 each containing the optical discs 2 to be subjected to the defect processing are stacked is sequentially lifted, and the uppermost case 3 is sequentially transported by the transfer means 7 such as a vacuum chuck. On the transfer means 4. The case 3 placed on the transfer means 4 is successively brought to the electromagnetic wave irradiation position of the electromagnetic wave generator 1, where the electromagnetic wave is irradiated for a required time, and thus the optical disk 2 irradiated with the electromagnetic wave, that is, Case 3 containing this
Is dropped into the collection section and is collected.

The electromagnetic wave generator 1 has, for example, a coil for supplying an alternating current to a magnetic core having a magnetic gap, that is, a gap for opening the magnetic path, which is formed in a part of the magnetic core. And an alternating magnetic field generating means. In this alternating magnetic field generating means, an alternating magnetic field is generated outside from the above-described magnetic gap, so that the case 3 containing the optical disk 2 brought by the above-mentioned transition means 4 is arranged in this magnetic field for a predetermined time. So that Further, the electromagnetic wave generating device 1 is provided with a shield case 9 so that the electromagnetic wave, that is, the alternating magnetic field, is not inadvertently emitted to other parts to cause noise of other electronic devices and the like. Then, the optical disk to be subjected to the defect processing, that is, the case 3 is carried into a space substantially surrounded by the shield case 9.
For this reason, the shield case 9 is provided with an entrance for carrying in and carrying out the case 3, respectively, and a shutter 10 for opening and closing these is provided.

As described above, an eddy current is generated in the metal film of the optical disk 2 by the application of the alternating magnetic field, and the Joule heat causes the metal film to be melted or scattered, thereby causing thermal destruction such as scattering. Destruction occurs and failure occurs.

The electromagnetic wave generator 1 may be constituted by a microwave generator, for example, a magnetron.

FIG. 3 shows the case 3 in which the optical disk 2 to which the electromagnetic wave has been irradiated is still stored. In this state, the plastic case 3 is not damaged at all, but the optical disk taken out from the case 3 is not damaged. Regarding 2, as shown in FIG. 4, the metal film, that is, the light reflection film of Al or the like, is broken due to the elimination of the metal film due to a linear pattern such as a tree shape or a ring shape.

That is, in the method of the present invention, when an optical disk having a metal film is inserted into a high electric field formed by applying a high voltage and a high frequency between electrodes facing each other, the distance between the electrodes is substantially reduced. It is considered that the film is efficiently destroyed by the heat generated by the discharge phenomenon and the eddy current.

Therefore, in the present invention, irradiation of a microwave with a high frequency such as 2450 MHz, such as a magnetron, is effective because the film can be destroyed in a short time. Also, Table 1 below (see Electronic Communication Handbook (1979), edited by the Institute of Electronics and Communication Engineers) for industrial, chemical, and medical uses can be used.

[0016]

[Table 1]

In the above-described example, in a state where the optical disk 2 to be made defective is stored in the case 3
In the case where the electromagnetic wave irradiation is performed, furthermore, a number of cases in which the optical disk 2 is accommodated, or a number of optical disks 2 not accommodated in the case are accommodated in an accommodating body having no metal film such as cardboard. Alternatively, the metal film of the optical disc 2 may be destroyed by performing the above-described electromagnetic wave irradiation from outside.

As described above, according to the method of the present invention, in the state where the label or the like is not removed from the optical disk 2 and further in the state where it is housed in the housing such as the case and the cardboard, the metal film is broken, that is, the optical disk is made defective. It can be carried out.

It should be noted that the optical disk degraded in this way is recycled by, for example, peeling off the label by the method disclosed in Japanese Patent Laid-Open No. Hei 6-223416.

[0020]

As described above, in the method of the present invention,
By irradiating the electromagnetic wave, the metal film to which the electromagnetic wave energy is efficiently transmitted is selectively destroyed.
Compared to the case of cutting a case, a cardboard, or the like, handling of the optical disk after the remarkable failure becomes easier. For example, the optical disk and paper can be easily removed from the disk case, and the case, the optical disk, the paper, etc. can be removed without contamination and other contaminants. Therefore, resources can be reused. The operation in the case is simplified.

[0021] Therefore, not only the efficiency of failure and the efficiency of recycling can be improved, but also the utilization efficiency of the resources can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of an apparatus for performing a method for making a defective optical disk having a metal film according to the present invention.

FIG. 2 is a schematic sectional view of the apparatus shown in FIG.

FIG. 3 is a plan view of a case in which an optical disk is accommodated after the optical disk having a metal film according to the present invention is subjected to a defect processing by a defect method.

FIG. 4 is a plan view of an optical disk after a defect processing by a defect method for an optical disk having a metal film according to the present invention.

[Description of Signs] 1 Electromagnetic wave generating means 2 Optical disk 3 Case 4 Transfer means 5 Supply unit 6 Placement unit 7 Recovery unit 9 Shield case

Claims (3)

[Claims] 1. A method for defecting an optical disk having a metal film, comprising: irradiating an electromagnetic wave onto the optical disk having the metal film to destroy the metal film. 2. The defect of an optical disk having a metal film according to claim 1, wherein the electromagnetic wave is irradiated to the optical disk having the metal film while the optical disk is housed in the housing. Method. 3. The method according to claim 1, wherein the electromagnetic wave is an alternating magnetic field, and an eddy current is generated in the metal thin film to cause thermal destruction of the metal thin film due to the eddy current. A method for defecting an optical disk having a metal film.