JPH07226047A - Disk tray - Google Patents

Abstract

PURPOSE:To obtain a disk tray so that the main body of tray and the disk are hardly scratched even though the disk is taken in/out, moreover the dimensional accuracy is high at the time of molding. CONSTITUTION:The disk tray is constituted in such a manner that the main body 1 of the tray provided with plural disk housing grooves 10 for individually housing the plural disks D by arranging plural wall members 11 in parallel and integrating them is held by a tray supporting frame body 2. The thermoplastic resin containing at least 5wt.% of water absorbing polymer is used as the material of the main body 1 of the tray.

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 in an autochanger device suitable for circular discs such as compass discs, and more particularly, when the disc is taken in and out, neither the disc tray body nor the disc is damaged. The present invention relates to a disc tray that is difficult to attach and has high dimensional accuracy during molding.

[0002]

2. Description of the Related Art Conventionally, compact discs have been used in the field of audio equipment and OA equipment, and they can deal with digitized data as compared with those of analog type discs, and therefore in terms of reproduction characteristics and recording density. Since it is excellent, it has become popular 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.

The above-mentioned disc autochanger device has a disc tray in which a plurality of disc storage grooves for accommodating a plurality of discs (for example, 20 to 100 discs) are arranged in series, and a large number of disc trays are contained in the disc tray. A desired disc among the discs is searched for, taken out, conveyed to a reproducing unit for reproduction, and the disc is returned to the tray after the reproduction is completed. There is a disc autochanger device described in Japanese Patent Publication No. -1114545, and the structure of a disc tray is shown in FIGS. 4 and 28.

[0004]

By the way, in such a disc tray, in order to make the shape as small as possible and accommodate a large number of discs, the intervals between the discs are very narrow, and the disc tray is compact. When a hard disk such as a disk having a fine uneven surface is taken in and out, the partition wall separating the disk and the disk rub against each other.

As a material for the conventional disc tray body, a resin composition such as acrylonitrile-butadiene-styrene (ABS) resin or polystyrene (PS) resin is generally used, and as a material for the compact disc or the like. In general, a polycarbonate resin as a main material has been used. Therefore, when the disc and the partition of the disc tray body rub against each other,
Since the partition wall, which has no surface hardness and does not have slipperiness, that is, the disc tray body is scraped, the scraped powder adheres to the disc surface, causing malfunction, and the disc is sharpened by the disc at sharp corners. There was a problem that the surface of the machine may be damaged and cause malfunction.

Further, the ABS resin or PS resin is conventionally used as the material of the disc tray main body. Since injection molding is used when manufacturing the disc tray main body, the flow of the resin is improved at the time of molding and the resin shrinks. This is because the rate was small and stable, but when this was made of polycarbonate resin of the same material as the disc,
Since the shrinkage rate is small, there is no problem in that respect, but since the disc and the tray body are the same material and the hardness is the same, it is hard to slip,
There is a problem that scratches are likely to occur on both the disc and the partition of the disc tray body.

On the other hand, when an ordinary olefin resin such as polypropylene resin is used, it is slippery and soft, so that the tray body is not easily scratched even when it rubs against the disc, but the shrinkage rate changes due to the difference in wall thickness. Is large, and the smoothness of the partition wall, which has to change the wall thickness partially, is out of order,
Since warpage occurs, the signal surface of the disc is rubbed, and if there is dust on it, it will still be scratched, or the disc will not be held to the required accuracy due to warpage, and it will malfunction when the desired disc is accurately ejected and returned again. There is a problem that is likely to occur.

Further, the disc tray body is attached to the AB
There is also a method of preparing with S resin or the like and coating the surface thereof with a paint containing silicon or a paint having high surface smoothness as a measure for preventing the occurrence of scratches, but the tray may be deformed by the solvent of the paint, Alternatively, when the coating is dried, there are various problems such as the occurrence of cracks and higher costs.

The present invention has been made in view of such conventional problems, and an object thereof is to prevent the tray body and the disc from being easily scratched even if the disc is repeatedly taken in and out, and at the time of molding. It is to provide a disc tray with high dimensional accuracy.

[0010]

To achieve the above object, the disc tray of the present invention has a plurality of disc storage grooves for accommodating a plurality of discs separately by accumulating a plurality of wall members in parallel. In a disc tray in which both sides of a tray body provided with are supported by both end side plates of a tray support frame, a thermoplastic resin containing at least 5% by weight of a water-absorbent polymer is used as a material of the tray body. There is.

Further, the disc tray of the present invention is characterized in that a saponified vinyl acetate copolymer is used as the water-absorbing polymer.

Further, the disk tray of the present invention is characterized in that the thermoplastic resin containing at least 5% by weight of the water-absorbent polymer has a water absorption amount of at least 1% by weight.

[0013]

As described above, in the present invention, the thermoplastic resin containing at least 5% by weight of the water-absorbent polymer is used as the material of the tray body, and the water absorbed by the water-absorbent polymer has a slippery property such as oil. As shown in the figure, the slipperiness is high, and the disc is not easily scratched even when the disc is taken in and out, and conversely, the tray body is not easily scratched by the disc. Further, since the shrinkage rate is small at the time of injection molding, warpage is unlikely to occur, a highly accurate disc tray can be formed, and malfunctions during use are eliminated.

[0014]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view showing the structure of an embodiment of the disc tray of the present invention. The disc tray of the present invention accommodates a plurality of discs separately as shown in FIG. It comprises a tray body 1 having a groove portion 10 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) formed of plastic as shown in FIG.
(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 recess provided on both sides of the partition wall 13, and the recess 12 forms a groove 10 for housing the disk D as shown in FIG. Although not shown in FIG. 1, reference numeral 14 denotes the wall member 11 as the tray body 1.
, And holes for passing rods used for attaching to the tray support frame 2, and the holes 14 are suitable at about three positions as shown in the figure.

As described above, the tray body 1 is formed by accumulating a large number of wall members 11, but the present invention is used in place of the conventional ABS resin, PS resin or the like as the material of the tray body 1, that is, the wall member 11. In the above, a thermoplastic resin containing at least 5% by weight of a water-absorbent polymer is used.

By using such a resin, even if the surface that can be contacted during insertion and ejection of the disc has a high surface hardness, it has good slipperiness, so that it will not be scratched, and the disc will also be scratched. Difficult to attach. Moreover, the dimensional accuracy at the time of molding can be obtained similarly to the conventional ABS resin and PS resin. Further, since the above-mentioned resin also has an antistatic effect, scratches due to dust adhesion are less likely to occur.

Examples of the water-absorbent polymer include saponified vinyl acetate copolymer and amide resin. In this case, as the component which is copolymerized with the vinyl acetate component of the vinyl acetate copolymer, for example, an olefin resin is suitable.

The thermoplastic resin may be ABS.
Resins, high-impact polystyrene (HIPS) resins, etc. may be mentioned.

The content of the water-absorbing polymer in the thermoplastic resin is at least 5% by weight, preferably 5 to
It is 50% by weight, more preferably 20 to 35% by weight. When the content of the water-absorbent polymer is less than 5% by weight, the amount of water that can be absorbed is small and sufficient slipperiness cannot be obtained. In addition, the water-absorbent polymer is contained in the thermoplastic resin in a spherical micelle state to form a layered form. Since it is not contained, a sufficient antistatic effect cannot be obtained. On the other hand, the water-absorbing polymer content is 5
If it exceeds 0% by weight, the water absorption is large and foaming tends to occur during molding.

Further, at least 5 parts of the above water-absorbent polymer are used.
In order to exhibit good slipperiness, the thermoplastic resin contained by weight% preferably has a water absorption amount of at least 1% by weight, and particularly preferably in the range of 1-5% by weight. When the water absorption amount is less than 1% by weight, the effect of slipperiness is not obtained so much, and when the water absorption amount is too large, there is a problem that foaming tends to occur during molding as described above.

Further, at least 5 parts of the above water-absorbent polymer are used.
In order to exhibit good slipperiness and antistatic effect, the thermoplastic resin containing wt% must have the water-absorbing polymer dispersed in the thermoplastic resin in the form of layers (or streaks) instead of spheres as described above. Is desirable. As described above, in order to disperse the water-absorbent polymer in a layered state in the thermoplastic resin, after setting the content of the water-absorbent polymer to at least 5% by weight,
It is effective to use a compatibilizer having a high affinity for both the water-absorbent polymer and the thermoplastic resin, and to apply a strong shearing force in the process of extruding and kneading the resin to produce pellets.

A specific example will be shown below.

The wall member 11 was molded using the HIPS resin containing 25% by weight of the saponified vinyl acetate copolymer, and several trays were formed by stacking several wall members (10 units in total) and tested. Even when the disc was taken in and out 10,000 times, no powder was found in 1 out of 10 tray bodies, and no particular scratch was found on the disc surface. On the other hand, in the case of using the conventional ABS resin, in the same test, the generation of powder generated by scraping the tray body was 1
Two of the 0 cars were seen.

[0026]

As described in detail above, according to the disc tray of the present invention, since the thermoplastic resin containing at least 5% by weight of the water-absorbent polymer is used as the material of the tray body, the slip property is high. No matter how many times the disc is taken in and out, the tray body is less likely to be scratched, and the disc side is also less likely to be scratched. Moreover, the disc tray of the present invention has a small shrinkage rate during injection molding, so that warpage does not occur. A disc tray that is difficult and has high dimensional accuracy at the time of formation can be formed, and an excellent effect that a malfunction does not occur during use can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view in a lateral longitudinal direction showing an embodiment of a disc tray of the present invention.

FIG. 2 is a perspective view of a wall member forming the disc tray of the present invention.

[Explanation of symbols]

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

Claims (3)

[Claims] 1. Both sides of a tray main body provided with a plurality of disc storage grooves for individually storing a plurality of discs by arranging and accumulating a plurality of wall members side by side are held by both end side plates of a tray support frame. In the disc tray, a thermoplastic resin containing at least 5% by weight of a water-absorbent polymer is used as a material of the tray body. 2. The disc tray according to claim 1, wherein a saponified vinyl acetate copolymer is used as the water absorbing polymer. 3. The disc tray according to claim 1, wherein the thermoplastic resin containing at least 5% by weight of the water-absorbent polymer has a water absorption amount of at least 1% by weight.