JP2002343053A - Recording media cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the IR transmittance cartridge case made of a resin for housing recording media while assuring its strength, moldability, etc. SOLUTION: Carbon black is added at 0.1 to 1.2 wt.% to the resin for molding the cartridge case 2 made of the resin for housing the recording media 3. The IR transmittance is lowered by addition of the carbon black and the degradation in the strength is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium cartridge having a recording medium housed in a cartridge case.

[0002]

2. Description of the Related Art At present, recording media cartridges which are commercially available, such as magnetic recording media and optical recording media, are housed in a cartridge case.
There are a magnetic disk cartridge containing a magnetic disk (such as a flexible disk and a magneto-optical disk), a magnetic tape cartridge containing a magnetic tape (such as a VTR tape and a tape for external storage of a computer), and an optical disk cartridge containing an optical disk. The cartridge case is generally formed of a resin molded product.

[0003] These recording media cartridges are loaded, ejected, and conveyed to a recording / reproducing apparatus by manual operation. In addition, a large number of them are stored in a library, and a predetermined recording media cartridge is automatically taken out by computer management. The recording / reproduction is performed by being conveyed to the reproducing apparatus, and after use, it is automatically conveyed and stored in the library. In such an automation system, it is necessary to detect the recording media cartridge, and a mechanical sensor can be used. However, it is preferable to detect the cartridge in a non-contact manner by an optical sensor such as an infrared sensor.

[0004]

When the cartridge case is made of resin, it is necessary to consider the strength, flame retardancy, moldability, etc., and to perform the above-mentioned detection by the infrared sensor without fail. It is necessary to provide the cartridge case with an infrared transmittance of, for example, 5% or less.

However, when molding a cartridge case, if an additive for lowering the infrared transmittance is added to a resin having a high infrared transmittance, characteristics such as strength and moldability may be reduced.

The present invention has been made in view of the above points, and a resin cartridge case for accommodating a recording medium is provided.
It is an object of the present invention to provide a recording media cartridge formed so as to obtain an appropriate infrared transmittance while securing strength, moldability, and the like.

[0007]

A recording medium cartridge according to the present invention is characterized in that carbon black is added in an amount of 0.1 to 1.0% by weight to a resin for forming a resin cartridge case for accommodating a recording medium. It is assumed that.

The resin for forming the cartridge case is preferably a polycarbonate resin, a fiber reinforced polycarbonate resin, an alloy resin of polycarbonate and ABS, an ABS resin, a polystyrene resin, and the like.
For these resins, carbon black is used in an amount of 0.1 to
1.0% by weight, preferably 0.2 to 0.8% by weight is added.

[0009]

According to the present invention as described above, by adding 0.1 to 1.0% by weight of carbon black to a resin for forming a resin cartridge case for accommodating a recording medium, the strength and the strength are improved. The infrared transmittance can be reduced to about 5% or less while ensuring moldability.

The addition of the carbon black lowers the infrared transmittance. In order to stably detect the infrared transmittance of about 5% or less by an infrared sensor, it is necessary to use 0.1%.
It is necessary to add 1% by weight or more, preferably 0.2% by weight or more.

On the other hand, the strength of the cartridge case of the recording media cartridge is generally 0.7 to 0.7.
A drop strength that withstands a drop impact from a height of 1 m is required, and from the viewpoint of ensuring moldability, the amount of the carbon black added is 1.0% by weight or less, preferably 0.8% by weight.
The following is assumed. That is, the addition of carbon black exceeding this amount is not preferable because the effect of reducing the infrared transmittance is saturated and the strength is disadvantageous.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a perspective view of a recording media cartridge according to one embodiment. The recording media cartridge according to this embodiment is a magnetic disk cartridge containing a magnetic disk medium as a recording medium.

In the magnetic disk cartridge 1, a flat cartridge case 2 is formed by joining an upper shell 21 and a lower shell 22 made of synthetic resin, and a center portion of the cartridge case 2 is attached to a center core 31. The disk-shaped magnetic disk medium 3 held in this manner is rotatably accommodated.

Upper shell 2 in cartridge case 2
1 and the lower shell 22 have a substantially rectangular flat shape,
A rectangular magnetic head insertion window 23 is provided, and a circular spindle hole (not shown) is formed at the center of the lower surface of the lower shell 22 in a size facing the bottom surface of the center core 31. In order to open and close the window 23, a shutter member 5 slidable in the left-right direction is assembled.

The cartridge case 2 is formed of a resin in which carbon black and other necessary additives are added to a polycarbonate resin. The addition amount of the carbon black is 0.1 to 1.0% by weight, preferably 0.2 to 0.8% by weight.

According to the magnetic disk cartridge 1 of the above embodiment, carbon black is added to the resin for molding the cartridge case 2 in an amount of 0.1% by weight or more, preferably 0.2% by weight or more. Therefore, the infrared transmittance of the molded cartridge case 2 is about 5% or less, and the non-contact detection by the infrared sensor can be stably performed by an automation system such as a library.

Further, the addition amount of carbon black is 1.0
Since the content is not more than 0.8% by weight, preferably not more than 0.8% by weight, the strength of the polycarbonate resin of the cartridge case 2 is hardly reduced, and good strength after molding can be secured.
As a result, the magnetic disk cartridge 1 in which the magnetic disk medium 3 is stored in the cartridge case 2 becomes
Sufficient drop strength can be ensured without an impact at the time of dropping from a height of 7 to 1 m without cracking or deformation of the recording / reproducing apparatus, which does not lose the function of drive operation or storage, etc.

In the above embodiment, a polycarbonate resin is used as the resin. However, if further strength is required, the strength may be increased by blending glass fiber, carbon fiber, or the like with the polycarbonate resin. Is preferred. Further, as another resin, an alloy resin of polycarbonate and ABS, an ABS resin, a polystyrene resin and the like can be used. Also in these resins, by adding 0.1 to 1.0% by weight (preferably 0.2 to 0.8% by weight) of carbon black, it is possible to achieve both infrared transmittance and strength.

In the above-described embodiment, an example of a magnetic disk cartridge containing a magnetic disk medium as a recording medium has been described. However, a magnetic disk cartridge containing other magnetic disks (flexible disk, magneto-optical disk, etc.) Magnetic tape (VT
The present invention is applicable to a recording media cartridge such as a magnetic tape cartridge containing an R tape or a tape for external storage of a computer, and an optical disk cartridge containing an optical disk.

In particular, a magnetic tape cartridge containing a single reel around which a tape for external storage of a computer is wound, a magnetic tape cartridge containing a VTR tape for business use, and the like, the weight increases as the amount of storage tape increases, and the drop strength decreases. Is a severe condition, so that it is preferable to add a small amount (0.1 to 0.2% by weight) of carbon black to a high-strength resin (for example, a fiber-reinforced polycarbonate resin).

[Brief description of the drawings]

FIG. 1 is a perspective view of a recording media cartridge according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic disk cartridge (recording media cartridge) 2 Cartridge case 3 Magnetic disk media (recording media)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideaki Shiga 2-12-1 Ogimachi, Odawara-shi, Kanagawa Inside Fuji Photo Film Co., Ltd.

Claims (1)

[Claims] 1. A recording medium cartridge in which a recording medium is housed in a resin cartridge case, wherein 0.1 to 1.0% by weight of carbon black is added to a resin for forming the cartridge case. And a recording media cartridge.