Magnetic-tape holding disc

Abstract

A magnetic tape chuck in which a positioning member contacts a positioning portion or a reference surface of a casing to stabilize the positioning accuracy when positioning the magnetic tape chuck. On the side of the chuck housing (2) that can rotatably accommodate the single reel (5) of the packaged tape (4), there is a positioning mechanism with a contact wall surface (23a) that contacts the positioning member (11) of the recording and playback device. part (23), the draft angle of the contact surface (23a) is formed to be smaller than the draft angles of other housing side surfaces. In addition, the contact wall surface of the positioning part can be formed into a glossy surface, so that the surface roughness is small.

Description

technical field [0001] The present invention relates to a magnetic tape cartridge for rotatably accommodating a single spool of a magnetic tape wound in a cartridge case, and more particularly to a structure for positioning the case. Background technique [0002] Conventionally, in a tape cartridge used as a recording medium on an external storage device such as a computer, a magnetic tape is wound on a single reel, and the reel is rotatably accommodated in a cartridge case. Since the magnetic tape is used for data storage in computers and other important information, it should be constructed so that there is no trouble such as tape jamming, and the tape cannot be pulled out accidentally. [0003] In addition, when the above-mentioned tape cartridge is installed in a recording and reproducing apparatus, it is required to be positioned correctly. For example, a positioning part is formed on the side surface of the chuck housing, and the positioning member of the recording an...

AI Technical Summary

Problems solved by technology

[0005] Then, on such a chuck housing, in order to improve the release property during molding as mentioned above, a film-drawing slope is provided on the side wall surface, and a film-drawing slope is also formed on the contact surface of the positioning part, and the positioning member When the contact position of the contact position changes in the up and down direction, corresponding to the above-mentioned film pulling slope, the positioning position changes, and there is a problem of unstable positioning.

[0006] In addition, when "shrinkage cavity" during molding occurs on the reference surface of the bottom surface of the chuck housing, the flatness and surface accuracy of the reference surface will be reduced, and positioning accuracy cannot be ensured.

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