JPH06282955A - Disk tray - Google Patents

Abstract

PURPOSE:To provide the disk tray which hardly warps and has high accuracy by using an olefin resin which has >=0.99 sp. gr. and <=0.8% shrinkage rate of molding without incorporation of pigments, etc., as the material of the tray body. CONSTITUTION:This disk tray is produced by using the olefin resin having >=0.99 sp. gr. and <=0.8% shrinkage rate of molding without incorporation of pigments, etc., as a wall member 11. The olefin film includes an ethylene- tetracyclododecene copolymer, ethylene-bicycloheptoene copolymer, ethylene- tricycloundecene copolymer, etc. Slipperiness is improved by using the resin even if the surface hardness is high in the parts having possibility of coming into contact with a disk at the time of inserting and discharging the disk. In addition, the dimensional accuracy at the time of molding as high as the dimensional accuracy of the conventional ABS resins and PS resins is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc tray used for an automatic changer device suitable for circular discs such as compact discs.

[0002]

2. Description of the Related Art Conventionally, compact discs have been used in the field of audio equipment and 0A equipment, and digitized data can be dealt with as compared with those of analog type discs, and therefore from the viewpoint of reproduction characteristics and recording density. Since it is also excellent, it has spread rapidly in recent years. In order to make use of such points, the compact disc is considered to be, for example, a commercial multi-disc automatic performance device, and is realized by a disc autochanger device corresponding to a so-called jukebox or karaoke device.

As the above-mentioned disc autochanger device, there is provided a disc tray device in which a plurality of disc storage grooves for individually storing a plurality of discs (for example, 20 to 100 discs) are continuously provided, and a large number of disc tray devices are accommodated in the disc tray device. , A desired disc is searched for and automatically played. For example, Japanese Patent Laid-Open No. 60-115545.
There is a disc autochanger device described in Japanese Patent Publication No. JP-A-2004-242242, and a disc tray is shown in FIGS. 4 and 28.

In such a disc tray, when a hard disc such as a compact disc having a fine uneven surface is taken in and out, the partition wall separating the disc and the disc rub against each other. As a conventional material for the tray body, a resin composition such as acrylonitrile-butadiene-styrene (ABS) resin or polystyrene (PS) resin has been generally used.

[0005]

A compact disc or the like generally has a polycarbonate resin as a main material and has fine irregularities on its surface. When the disc and the tray body are rubbed with each other, the surface is Since the partition wall without hardness, which is not slippery, that is, the tray body is shaved, the shaved powder adheres to the disk surface, causing malfunction, and the disk is sharpened by the disk at sharp corners. There was a problem that it may cause malfunctions such as being damaged.

Further, the material of the tray body is made of the ABS resin or PS resin, because injection molding is used when manufacturing the tray body, so that the flow of the resin is improved at the time of molding and the shrinkage ratio is small and stable. However, when it is made of polycarbonate resin of the same material, the shrinkage rate is small, but the hardness is the same and it is hard to slip, and scratches easily occur on the disc and the partition wall of the tray body. When a normal olefin resin such as polypropylene resin is used, there is no problem because it is slippery and soft, so there is no change in the shrinkage ratio due to the difference in wall thickness, and there is partial wall thickness. The smoothness of the partition wall that cannot be changed causes warpage, so the signal surface of the disc is rubbed, and if dust is there, it will still be scratched, and the disc is necessary because of warpage. Can not be maintained in accuracy, malfunction for causing tilting there is a problem easily occurs.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and is a tray main body provided with a plurality of disc storage grooves for accommodating a plurality of molded bodies and separately storing a plurality of discs. An olefin resin having a specific gravity of 0.99 or more and a molding shrinkage of 0.8% or less without mixing of pigment as a material of the tray main body in a disc tray whose both sides are held by both end plates of a tray support frame. It is a disk tray characterized by using.

[0008]

As described above, according to the present invention, the wall member of the tray main body is made of the above resin, so that the sliding property is high, the disc is not easily scratched, and conversely, the tray main body is not scratched. Further, since the shrinkage rate is small at the time of injection molding, it is possible to form a highly accurate disc tray which is less likely to warp, does not operate during use, and the surface hardness of the tray body is preferably H or higher, preferably F or higher.

[0009]

The present invention will be described in detail below. FIG. 1 is a front view showing an embodiment of a disc tray of the present invention. As shown in FIG. 1, the disc tray of the present invention has a tray body 1 having a groove portion 10 for individually storing a plurality of discs.
And a tray support frame 2 to which the tray body 1 is attached.

The tray body 1 has a large number of wall members 11 (for example, 2
(0-100 sheets) It is in the shape of a tray that is arranged side by side in the lateral direction. Here, 12 is a concave portion provided on both sides of the partition wall 13, and the concave portion 12 forms the groove portion 10 for accommodating the disk D as shown in FIG. In addition, 14 is shown in FIG.
Although not shown in FIG.
And holes 14 for accommodating and stacking rods for attaching to the tray supporting frame 2 are preferably provided at about three places.

The wall member 11 is made of ABS resin, PS
In the present invention, an olefin resin having a specific gravity of 0.99 or more and a molding shrinkage rate of 0.8% or less is used in place of the resin in the present invention. There are decene copolymers, ethylene-bicycloheptoene copolymers, ethylene-tricycloundecene copolymers and the like. By using the above resin, even if the surface hardness is high at the part that can come into contact when inserting or ejecting the disc, it does not scratch because it has good slipperiness, and the dimensional accuracy during molding is the same as the conventional AB.
It is obtained in the same manner as S resin and PS resin. Further, the surface hardness is higher than that of low one, and the pencil hardness thereof is HB or more, preferably F.
The above is good. Antistatic agent included in the above resin (kneaded)
If this is done, it is better against scratches.

Specific examples of the above-mentioned ethylene-tetracyclododecene copolymer include ethylene-tetracyclo [4.4.0.1 ^2,5 . ^1,7,10 ] -3-dodecene copolymer, ethylene-8-butyltetracyclo [4.
4.0.1 ^2,5 . ^1,7,10 ] -3-Dodecene copolymer, ethylene-8-ethyltetracyclo [4.4.0.
1 ^{2, 5} . ^1,7,10 ] -3-dodecene copolymer, ethylene-
8-stearyl tetracyclo [4.4.0.1 ^2,5 . 1
^7,10 ] -3-Dodecene copolymer, ethylene-9-ethyl-11.12-dimethyltetracyclo [4.4.0.1
^2,5 . 1 ^7,10 ] -3-dodecene copolymer and the like can be used.

The wall member 1 is molded by using the above resin having a specific gravity of 1.03, a surface hardness F, and a molding shrinkage ratio of 0.5 to 0.6%, and several trays are stacked to form a tray body. As a result of the test, in the case where the conventional ABS resin is molded, the disk is ejected 10,000 times and the powder generation is 2 out of 10 units.
In the same test, no powder outbreak was found in 10 units, while the number of units was found.

[0014]

EFFECTS OF THE INVENTION The present invention is constructed as described above, and the wall member of the tray main body is made of a cyclic olefin polymer, and the cyclic olefin polymer is ethylene-olefin.
Since it is a tetracyclododecene copolymer, it has high slipperiness and is hard to scratch the disc, and conversely, the disc does not scratch the tray body. Further, since the shrinkage rate is small at the time of injection molding, warp is hard to occur and a highly accurate disc tray can be formed, and malfunction does not occur during use.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a disc tray of the present invention.

FIG. 2 is an explanatory perspective view showing an embodiment of a wall member used in the present invention.

[Explanation of symbols]

 1 Tray Main Body 2 Tray Support 10 Groove 11 Wall Member 12 Recess 13 Partition Wall 14 Hole

Claims (2)

[Claims] 1. A disc tray in which both sides of a tray body provided with a plurality of disc storage grooves for accommodating a plurality of molded bodies and separately storing a plurality of discs are held by both end side plates of a tray support frame. A disc tray characterized in that an olefin resin having a specific gravity of 0.99 or more and a molding shrinkage rate of 0.8% or less is used as a material of the tray body without mixing of a pigment. 2. The disc tray according to claim 1, wherein an ethylene-tetracyclododecene copolymer is used as the olefin resin.