JPH076546A - Cartridge - Google Patents

Abstract

PURPOSE:To improve the moldability of a case, to enhance quality and to improve productivity by constituting the cases of a cartridge of a polycarbonate resin having a specific average mol.wt. CONSTITUTION:The upper cases 1, 2 of the cartridge formed by housing and disposing a disk-shaped medium 7 or tape-shaped medium into the cases 1, 2 molded of a thermoplastic rigid resin of a polycarbonate resin are constituted of the polycarbonate resin having the 15000 to 18000 range of the average mol.wt. Further perferably, the average mol.wt. is specified to 16000 to 17000. As a result, the strength and the moldability are well balanced and appearance defects, such as sink marks and burn marks, and deformation, such as warpage, are eliminated even if the cases are molded small and thin. The molding quality is thus enhanced, the easily moldable form is attained and the productivity is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge containing a disk-shaped medium such as a hard disk or a flexible disk such as an optical disk or a magneto-optical disk, or a tape-shaped medium such as an audio tape, a video tape or a digital audio tape as an information medium. It relates to a tape cartridge.

[0002]

2. Description of the Related Art Generally, information media such as disk cartridges and tape cartridges are easily protected from dust and scratches in handling, and are therefore stored in a synthetic resin shell, which is protected by a PC resin. (Polycarbonate resin), ABS resin (acryotetril-butadiene-styrene copolymer resin), PS resin (polystyrene resin), PP resin (polypropylene resin), etc. ing.

[0003]

The synthetic resin case of the conventional cartridge is injection-molded. However, in the case of a molding material having a relatively poor flow such as a polycarbonate resin, even if the influence of the flow orientation is sufficiently taken into consideration, a sink mark or There is a drawback that warpage is likely to occur and the appearance quality of the molded product is deteriorated. Especially, in the conventional case, since the polycarbonate resin used a material having a molecular weight of 20,000 or more, if the case is made small and thin,
The fluidity during molding is even worse, and sink marks, burns, weld lines, and other appearance defects are likely to occur, and deformation such as warpage may cause unsatisfactory moldability and reduce product value, resulting in mass production. It was a problem in terms of both sex and reliability. The present invention is intended to eliminate these drawbacks of the prior art, and even if the case is made thin and thin, the appearance is good and there is little deformation, and the molding efficiency is greatly improved to improve productivity and quality at low cost. It is intended to be a cartridge.

[0004]

SUMMARY OF THE INVENTION The present invention is a cartridge in which a disk-shaped medium or a tape-shaped medium is housed and arranged in a case molded from a thermoplastic synthetic resin of polycarbonate resin, and the case has an average molecular weight of 15,000.
The cartridge is characterized in that it is composed of a polycarbonate resin in the range of ˜18,000.

[0005]

Operation: The cartridge case has an average molecular weight of 15,000.
By using polycarbonate resin in the range of up to 18000, it is possible to form a shell with a well-balanced strength and moldability even when the case is made small and thin, and there are no sink marks, burns, or other appearance defects, and deformation such as warpage. In addition, it can be used without any hindrance to the appearance, the quality of the molded product is good, the reliability is high, the fluidity is easily improved, and the form is easy to mold, and the productivity is greatly increased.

[0006]

EXAMPLE An example of the present invention will be described with reference to the example of the disk cartridge and the tape cartridge shown in FIGS.
Average molecular weight 15,000-18,000, preferably 160
A cartridge using a polycarbonate resin having a molecular weight of 00 to 17,000, that is, the upper case 1 and the lower case 2 are welded by ultrasonic welding means or screwed.

In this case, the cases 1 and 2 are made of a polycarbonate resin having an average molecular weight of 16,000 to 17,000.
It is also useful for improving moldability that the alloy is composed of an alloy of 70% by weight and 30-50% by weight of a copolymer resin (ABS resin) of acrylonitrile butadiene styrene. In addition, in order to prevent discoloration of the case, consideration should be given to the case where the polycarbonate resin contains a phosphorus-based antioxidant, for example, a phosphite ester, or a fatty acid ester to improve releasability at the time of molding. However, it is preferable that at least one of a heat stabilizer, an impact modifier and a release agent is added as required.

In the disk cartridge of FIG. 1, one or more welding ribs 4 of one or more welding surface portions 3 provided at the respective corners of the upper and lower cases 1 and 2 may be selected as a gate mark.
It is taken into consideration that the welding rib 4 is provided in an annular shape on the top surface of the welding portion of the hollow cylindrical body. A disk-shaped medium 7 is rotatably housed in a case consisting of the upper case 1 and the lower case 2 via liners 6 and 6, and a recording / reproducing head insertion window portion or a pickup insertion formed in the case is inserted. A metal or resin shutter 9 for opening and closing the opening 8 such as a hole or a drive shaft insertion hole is slidably provided in the slide area 10. The case is not limited to a disc cartridge, and is selected to be a cartridge or a cassette in the form of a tape medium of an audio, video or digital compact cassette, and other molded parts for welding can be formed on the welding surface of each part. Correspondingly, the gate trace may be used as a welding rib.

In the embodiment shown in FIG. 2, a video tape cassette is used as an example, and an upper case 1 and a lower case 2 molded from a polycarbonate resin having an average molecular weight of 15,000 to 18,000 are used.
Pair to become the case, the tape 11 is deployed wound on a pair of reels 12 and 12 having rotatably, restricts rotation of the reel 2 disengaged from the locking teeth 12 ₁ provided on the reel and a The reel brake 13 is biased by a spring, and the reel brake 13 is interlocked with a release lever 14 facing the insertion opening of the deck side release pin.

The embodiment shown in FIG. 3 is a disk cartridge containing a hard disk 20 such as an optical disk and a magnetic disk, and is composed of 60% (% by weight) of a polycarbonate resin having an average molecular weight of 15,000 to 18,000 and 40% (% by weight) of an ABS resin. Upper case 21 and lower case 22 made of alloy
And a case 1 in which an information medium disk 20 is housed and an opening 23 such as a head insertion hole is formed.
And a shutter 24 having a substantially U-shaped cross section for opening and closing the opening 23, which is slidable, facing a drive shaft insertion hole 26 provided in a lower case 22 having a medium storage area 27. This is a disk cartridge in which the clamping plate 25 is arranged at the position to be used.

In the above case, the average molecular weight is 15,000.
The characteristics of a cartridge case molded of a polycarbonate resin having an average molecular weight of ˜18,000 and other values are shown in Table 1. Therefore, the molecular weight is 18,000
When it is above, short shots are likely to occur, sink marks and burns are large, the appearance quality is deteriorated, and the molecular weight is 1500.
When it is 0 or less, the moldability is good, but the number of cracks is increased and the appearance quality and strength are deteriorated.

[0012]

[Table 1]

[0013]

INDUSTRIAL APPLICABILITY The present invention provides a cartridge in which a disk-shaped medium or a tape-shaped medium is housed and arranged in a case formed of a thermoplastic resin such as a polycarbonate resin, and the case has a polycarbonate resin having an average molecular weight of 15,000 to 18,000. With this configuration, it is possible to form a shell with a well-balanced strength and formability even if the case is made small and thin, and there are no sink marks, burns, or other appearance defects, and there is no deformation such as warping, and there is no hindrance to the appearance. Cartridges that are used without any problems, have good molded product quality, high reliability, easy improvement of fluidity, easy-to-mold form, and greatly improved productivity, and high-value-added, inexpensive cartridges. Can be

[Brief description of drawings]

FIG. 1 is a perspective view of a cartridge according to an exemplary embodiment of the present invention in a separated state.

FIG. 2 is a perspective view of a cassette according to another embodiment of the present invention in a separated state.

FIG. 3 is a perspective view of a cartridge according to another embodiment of the present invention in a separated state.

[Explanation of symbols]

 1 Upper case 2 Lower case 3 Welding surface 4 Welding rib 7 Disc-shaped medium 8 Opening 9 Shutter 10 Sliding area 11 Tape 12 Reel 20 Disc 21 Upper case 22 Lower case 23 Opening 24 Shutter

Claims (4)

[Claims] 1. A cartridge in which a disk-shaped medium or a tape-shaped medium is housed and arranged in a case formed of a thermoplastic synthetic resin of polycarbonate resin, wherein the case is made of polycarbonate resin having an average molecular weight of 15,000 to 18,000. Cartridge characterized by. 2. The case has an average molecular weight of 16,000 to
17,000 polycarbonate resin 50-70 wt% and acrylonitrile butadiene styrene copolymer resin (A
The cartridge according to claim 1, which is composed of an alloy of 30 to 50% by weight of (BS resin). 3. The cartridge according to claim 1, wherein the case is made of the polycarbonate resin containing a phosphorus-based antioxidant. 4. The cartridge according to claim 1, wherein the case is formed by containing a fatty acid ester in the polycarbonate resin.