JPH06122491A - Case for storing information recording medium - Google Patents

Abstract

PURPOSE:To absorb the ultraviolet rays from outside a case for storing information recording medium such as optical disk so as to protect from ultraviolet rays a recording layer of the information recording medium in the case by forming a light transmission part of the material containing an ultraviolet ray absorbing agent. CONSTITUTION:A case for storing information recording medium having a light transmission part and, as required, a light shielding part is composed of a storing part 2 for storing an optical disk, a lid part 3 for covering therewith the opening part of the disk storing part 2 and a joining part 4 for pivotally mounting the one side of the lid part 3 to the disk storing part 2. The optical disk is received in a cylindrical protecting part 6 of the bottom of the disk storing part 2 and an opening part of the optical disk is passed over a cylindrical retaining part 5 consisting of a projecting piece to securely hold the optical disk in the disk storing part 2. In this case, the light transmission part of the disk storing case 1 is formed of the material containing an ultraviolet ray absorbing agent. In this way a recording layer of the optical disk is protected from ultraviolet rays and the recording information is prevented from lowering of reproduction accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium having a recording layer which is easily deteriorated by ultraviolet light, for example, a storage case for an information recording medium which can be protected from ultraviolet light.

[0002]

2. Description of the Related Art Since an information recording medium (optical disk) for recording / reproducing using a laser beam can record 10 ⁷ to 10 ⁸ bits per cm ² , it is possible to perform high density recording as compared with a conventional recording medium. It has the great advantage of being possible. Further, since the optical disk is a recording medium of a non-contact recording / reproducing system (laser light irradiation), the life of the disk is semi-permanent and is resistant to scratches and dust. Therefore, optical discs are used in a wide range of fields such as the music field where high sound quality is required and the computer field where accurate and large amount of information recording is required.

Although such an optical disc may be slightly different depending on its type and purpose of use, a Te-based compound (TeC, PbTeSe, etc.) An information recording layer made of TeOx, an organic dye, etc., a reflective layer made of an aluminum film, etc., and a protective layer for protecting these layers are laminated.

For example, the information recording layer using a dye absorbs the light radiated through the substrate to generate heat, melt, evaporate, sublimate or metamorphose, and record information by forming pits on the surface. . Therefore, the dye used in such a recording layer is generally 780 n so that information can be recorded and reproduced by using a laser beam having a wavelength of 780 nm.
A dye (cyanine dye) having an absorption wavelength characteristic in m may be used. However, many of these dyes are easily deteriorated when irradiated with ultraviolet rays.

On the other hand, the case for accommodating the optical disk is generally made by injection molding a transparent material such as styrene polymer. Some cases have a dye-containing colored portion (non-light-transmitting portion) and a dye-free transparent portion (light-transmitting portion). The optical disk housed in such a case is rarely damaged and is often handled messyly because it is easy to handle and carry. For example, there is a case where a case accommodating an optical disc is left on a desk or the like and exposed to sunlight or light from a fluorescent lamp. Of course, the optical disc substrate and the case that houses it are made of a low-volatile material that does not easily deform even in a high temperature environment, so it is considered that there is no problem even if they are left on a desk or dashboard. There is.

[0006]

However, since the conventional case for accommodating the optical disk is subjected to some ultraviolet absorption treatment, it is contained in the recording layer of the optical disk by the ultraviolet rays contained in the light of sunlight or fluorescent light. The dye that is used may deteriorate. Therefore, when information is to be recorded on the optical disc in which the dye is deteriorated, a desired pit due to the writing light (laser light) is not formed, which causes a problem that accurate information recording cannot be performed. In addition, even after recording information on an optical disc in which the dye is not deteriorated, the pits are deformed or deteriorated when the optical disc is irradiated with ultraviolet rays and the dye in the recording layer is deteriorated. (For example, the high sound quality characteristic of the CD is deteriorated). As a result, even though the optical disk has an excellent characteristic that the life of the disk is semi-permanent due to the non-contact recording / reproducing method, the life of the optical disk as a recording medium is shortened.

Therefore, an object of the present invention is to provide an information recording medium case in which the information recording medium is not exposed to ultraviolet rays while being housed in the information recording medium case.

[0008]

In order to solve the above problems, the present invention is intended to accommodate an information recording medium in which a recording layer, a reflective layer and a protective layer are laminated on a substrate. In the case for an information recording medium having a transparent portion, the transparent portion is made of a member containing an ultraviolet absorber.

[0009]

The translucent section made of a member containing an ultraviolet absorber absorbs the ultraviolet light emitted from the outside of the information recording medium storage case, thereby hindering the transmission of the ultraviolet light to the inside of the information recording medium storage case.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a storage case for an information recording medium according to the present invention. The storage case 1 for the information recording medium includes a benzophenone-based ultraviolet absorber (U
V-10, manufactured by Dainichiseika Kogyo Co., Ltd.) and obtained by injection molding a transparent styrene polymer. Therefore, in the case of the present embodiment, all the surfaces of the case 1 are translucent parts capable of transmitting light.

The information storage medium storage case 1 includes a storage portion 2 for storing a disk-shaped optical disk (not shown).
And a lid portion 3 for covering the opening of the storage portion 2 and a coupling portion 4 for opening and closing the end portion of the lid portion 3 to the storage portion 2 so as to open and close.

The storage portion 2 is formed of a rectangular box body, and has a claw portion for detachably engaging the opening portion of the optical disk formed in a donut shape at the center of the inner surface of the bottom portion of the box body. The optical disc holding portion 5 made of the protruding pieces is formed in a substantially cylindrical shape. Further, on the inner surface of the bottom portion, there is formed an optical disk peripheral surface protection portion 6 which is formed concentrically with the holding portion 5 and is composed of a cylindrical projection piece having a diameter slightly larger than the diameter of the optical disk. Furthermore, this storage part 2
Holes (not shown) are formed at the ends of the two side walls facing each other out of the four side walls.

The lid portion 3 is a box-shaped body which is slightly larger than the storage portion 2 and fits into the storage portion 2. Further, protrusions are provided respectively on the inner ends of the two opposing side walls, and the protrusions are rotatably fitted into the holes (not shown) of the storage portion 2 to form the coupling portion 4.

In the information recording medium case 1 configured as described above, the optical disk is housed inside the protection section 6, and the opening of the optical disk is locked by the holding section 5 and fixed in the housing section 2. Then, by closing the lid portion 3, the optical disc can be protected from ultraviolet irradiation.

<Experimental Example 1> An information recording medium storage case (experimental group) containing the ultraviolet absorbent of the above embodiment and an information recording medium having the same configuration as the above embodiment except that the ultraviolet absorbent is not included. An unrecorded optical disk was stored in each of the storage case (control group).

The optical disk used in this experimental example is 780
A recording layer containing a cyanine dye having an absorption characteristic in nm, a reflective layer formed of a gold coating, and a protective layer formed of an ultraviolet curable resin are laminated on a polycarbonate substrate.

After storing, the xenon lamp light is 40 mW / c.
Irradiation was performed at an intensity of m ² for 400 hours.

After the irradiation, the optical disk was taken out from the information recording medium storage case and the EFM signal was recorded. Then C
The information recorded on the optical disc was set in the D player and reproduced.

As a result, the CD of the experimental group could obtain a highly accurate reproduction signal, while the CD of the control group could obtain a reproduction signal with much noise that could not be put to practical use.

<Experimental Example 2> Next, the same experiment as in Experimental Example 1 was carried out using an optical disc on which an EFM signal was recorded.

Storage case for information recording medium (experimental group) containing the ultraviolet absorbent of the above embodiment, and storage case for information recording medium (control group) having the same constitution as the embodiment except that the ultraviolet absorbent is not included. An optical disk (same as Experimental Example 1 except that the EFM signal has been recorded) was housed in each of the above.

After storing, the xenon lamp light is 40 mW / c.
Irradiation was performed at an intensity of m ² for 400 hours.

After the irradiation, the optical disk was taken out from the information recording body storage case and set in a CD player for reproduction.

As a result, the CD of the experimental group obtained a high-accuracy reproduced signal, while the CD of the control group obtained a reproduced signal with a large amount of noise that could not be put to practical use.

Therefore, as is clear from Experimental Examples 1 and 2, the information recording medium according to the present invention is composed of a member containing an ultraviolet absorber, so that the ultraviolet absorber absorbs ultraviolet rays radiated from the outside, It is possible to avoid the destruction of the optical disc recording layer due to ultraviolet rays.

Although the benzophenone type ultraviolet absorber is used as the ultraviolet absorber in the above-mentioned embodiment, the benzotriazole type ultraviolet absorber, Co, Mn, ZnS-CdS,
CdS-CdSe and the like can also be used.

Further, instead of containing the ultraviolet absorbent in the plate material forming the information recording storage case, S is formed on the surface of the information recording storage case made of a material not containing the ultraviolet absorbent.
Oxides or nitrides of i, Zn, Ti, Al, etc. may be coated by sputtering or vapor deposition.

Further, in the above-mentioned embodiment, the storage case for the information recording body is made of a transparent styrene polymer as a whole. However, for example, the storage portion is made of an opaque material and only the lid portion is provided with the ultraviolet absorber. It may be made of a transparent material including. Alternatively, only a part of the lid part may be provided with a transparent part treated with the ultraviolet absorbent, and the part other than the part may be opaque.

As described above, the present invention is not limited to the above embodiment and the accompanying drawings, and many modifications can be made.

[0031]

In the storage case for an information recording medium according to the present invention, the light transmitting portion is made of a member containing an ultraviolet absorber, so that the light transmitting portion made of a member containing an ultraviolet absorber is used for the information recording medium. By absorbing the ultraviolet rays emitted from the outside of the storage case, the transmission of the ultraviolet rays to the inside of the storage case for the information recording medium is hindered, whereby the recording layer of the information recording medium stored in the storage case for the information recording medium is exposed to ultraviolet rays. Can be protected from.

[Brief description of drawings]

FIG. 1 is a perspective view of a storage case for an information recording medium according to the present invention.

[Explanation of symbols]

 1 Storage case for information recording medium whose entire surface is a translucent section 2 Storage section 3 Lid section 4 Coupling section 5 Optical disk holding section 6 Optical disk peripheral surface protection section

Claims (1)

[Claims] 1. An information recording medium case for accommodating an information recording medium comprising a recording layer, a reflective layer, and a protective layer laminated on a substrate and having a light transmitting portion, wherein The storage case for an information recording medium is characterized in that the part is made of a member containing an ultraviolet absorber.