JPH04188481A - Cartridge for recording medium use - Google Patents

Abstract

PURPOSE:To prevent the surface of an optical disk from being deteriorated by a method wherein a through hole which is ventilated to the outside is made in disk housing wall surfaces at an upper half and a lower half. CONSTITUTION:A cartridge 6 for disk use is composed of an upper half 7 and a lower half 8; a disk 1 is housed. In this case, through holes 17 which can be ventilated to the outside are made in inner wall surfaces at the upper half 7 and the lower half 8, i.e., in rise walls 13, 14 and wall surfaces at the upper half and the lower half. Consequently, a radiated gas generated from the inside of an optical disk main body and a cartridge main body can be discharged easily to the outside via the through holes 17. Thereby, it is possible to restrain the surface of the optical disk from being deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording medium cartridge used for rotatably housing a disc-shaped disk such as a floppy disk or an optical disk within the cartridge body.

[Prior art and its problems] Conventionally, as a cartridge for a recording medium, a disk cartridge that houses a disc-shaped disk such as a floppy disk or an optical disk is known, and the cartridge is made of polycarbonate, etc. Molded products made by injection molding of synthetic resins that have good moldability and sufficient mechanical strength are used. An example is shown in FIGS. 6 and 7.

A storage medium such as a disc cartridge, e.g.
It has been found that there is a problem in that when an optical disk or the like is stored, the surface of the optical disk inside the cartridge gradually deteriorates.

[Means for Solving the Problem] As a result of intensive studies to solve the above problems, the inventors of the present invention have found that the optical disc can be removed from the hard coat layer (protective layer) and adhesive layer of the optical disc body or from the inner surface of the cartridge body. Gases that degrade the surface, such as impurities contained in the polycarbonate resin such as methylene chloride, acetone, and/or methyl ethyl ketone, can be removed from the inside of the cartridge body from the inside of the cartridge body, such as methylene chloride, acetone, and/or methyl ethyl ketone. Gas components containing trace amounts of impurities (These impurities may be caused by some of the reaction solvent used during the production of polycarbonate resin remaining without being removed, or by thermal decomposition of part of the polycarbonate resin during molding) It was found that due to the production of impurities in the polycarbonate resin, a trace amount of impurities (which are contained in the polycarbonate resin) were released. As a result of various studies, the inventors of the present invention found that by providing a through hole in the inner surface of the cartridge body that allows ventilation with the outside, gas released from the inner surface of the cartridge is released to the outside through the through hole, and the optical disc inside the cartridge is They discovered that surface deterioration can be controlled and completed the present invention.

That is, the gist of the present invention is to provide a recording medium cartridge for rotatably housing a disk, which is comprised of an upper half and a lower half, and includes a through hole in the inner wall surface of the disk housing of the upper half and the lower half for ventilation with the outside. A cartridge for a recording medium, characterized in that it is provided with:

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

FIG. 1 is an exploded perspective view of a disk cartridge (a cartridge containing a disk) according to the present invention, and FIG. 2 is a longitudinal sectional view of the cartridge shown in FIG. 1. In the figure, 1
2 is an optical disk, 2 is a recording area, 3 is a non-recording area on the outer periphery, and 4 is a non-recording area on the inner periphery. Magnetic metal hubs 5a and 5b for magnetic chucking are provided at the center. As the disk 1, for example, an optical disk 1 having an information signal recording layer provided on a disk substrate made of polycarbonate resin is preferably used.

The structure of the optical disc 1 is roughly divided into the following types: an air sandwich structure as shown in FIG. 3, a full-surface adhesive bonding method as shown in FIG. 4, and a single-plate coating method as shown in FIG. Ru. The present invention can be applied to any of these structures.

In the figure, 21 is a substrate, 22 is a recording layer, 23 is a spacer, 24
25 is an air layer, 25 is an adhesive layer, 26 is a protective layer, and 27 is a surface protective layer (overcoat layer).

A cartridge 6 rotatably stores the disk 1 described above. For example, polycarbonate resin,
It is made by injection molding a synthetic resin such as ABS resin that has good moldability and sufficient mechanical strength. The disk cartridge 6 consists of an upper half 7 and a lower half 8, which are sufficient to rotatably accommodate the disk 1 inside when they are butted against each other and assembled by screwing or the like with the disk 1 stored therein. A rising wall 1 is provided on the periphery of the upper half 7 and the lower half 8 to form a peripheral side wall of the cartridge body.
3.14 is formed, and a plurality of arcuate ribs 16 constituting the disk storage portion 15 are respectively protruded from the inner surface in a circumferential shape slightly larger than the outer diameter of the disk 1. On the inner surface surrounding the insertion openings 9, 10 of the upper half 7 and lower half 8 of the cartridge 6, there are ribs 11.
12 are usually provided in a circumferential manner.

The cartridge of the present invention has a structure in which through-holes 17 are provided on the inner wall surfaces of the upper half 7 and lower half 8, that is, on the rising walls 13.14 and on the wall surfaces of the upper half and the lower half, allowing ventilation with the outside. The gas generated from the inner surface of the cartridge main body can be easily released to the outside through the through hole 17, and thereby, for example, deterioration of the optical disk surface can be suppressed. The through hole 17 may have any shape as long as it is a cutout or a shape that allows ventilation with the outside, such as water. In addition, a plurality of vent holes 18 such as grooves, holes, notches, etc. are provided to allow ventilation between the inside and outside of the ribs 16 of the upper half 7 and the lower half 8, and the upper and lower half 7
．． Through holes 19 that allow ventilation to the outside may be provided in the 8 portions, particularly at positions outside the ribs, particularly at positions near the four corners. The through-holes 17, 19 and the ventilation holes 18 provided in the ribs 16 may be provided with mesh-like, sponge-like, etc. filters to prevent the entry of debris and the like.

Since the cartridge of the present invention has the above structure, the gas released from the hard code layer (protective layer) and adhesive layer of the optical disc body (for example, when an acrylic ultraviolet curable resin is used as the hard coating agent, the constituent components thereof are Some of various acrylic acid monomers, their modified products (decomposition products, reactants), reaction initiators, sensitizers, etc. are released as gas from the cured film, and these deteriorate the recording film in high temperature and high humidity conditions. .)
or the cartridge body, for example, when polycarbonate resin is used as the cartridge material, impurity components such as methylene chloride, acetone, and/or methyl ethyl ketone contained in trace amounts in the resin (these impurity components are Sometimes, some of the reaction solvent used remains without being removed, or some of the polycarbonate resin thermally decomposes during polycarbonate resin molding, resulting in the formation of impurities. A released gas containing a very small amount of water is released from the inner surface of the cartridge main body, and this released gas is released to the outside through the through hole 19, so that the recording medium stored in the cartridge, e.g. Deterioration of optical discs can be suppressed. Experimentally, when the through hole 19 was provided and when it was not provided, no change occurred even after 500 hours at 85°C and 185% RH when the through hole 19 was provided, but when the through hole was not provided. In this case, a defect occurred on the media surface.

[Effects of the Invention] The cartridge of the present invention can suppress deterioration of the optical disc contained therein, and is stable over time.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the cartridge of the present invention, FIG. 2 is a longitudinal sectional view of the cartridge shown in FIG. 1, and FIGS.
The figure is a longitudinal cross-sectional view showing an example of an optical disc, and FIGS. 6 and 7 are drawings similar to FIGS. 1 and 2 of a conventional cartridge. In the figure, 1 is an optical disk, 6 is a cartridge, 7 is an upper half, 8 is a lower half, and 17 is a through hole.

Claims (1)

[Claims] (1) A recording medium cartridge consisting of an upper half and a lower half and for rotatably storing a disk,
A cartridge for a recording medium, characterized in that the disk housing walls of the upper half and the lower half are provided with through holes for ventilation with the outside.