Dynamic magnetic information storage or retrieval – Record medium – In container
Reexamination Certificate
1998-06-03
2001-03-06
Miller, Brian E. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record medium
In container
C369S291100
Reexamination Certificate
active
06198598
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a disc cartridge such as so-called floppy disc and, more particularly, to a disc cartridge designed to rotate at a high speed, for example, 3000 rpm or 3600 rpm, so as to increase its memory capacity.
Such a conventional disc cartridge includes first and second liners brought into soft pressure contact with its disc-shaped recording medium for arresting dust from the opposite side surface of the disc-shaped recording medium when it is placed in position on a disc drive unit. One of the problems associated with such a conventional disc cartridge is that the dust arrested on the first and second liners tends to damage the recording medium. This is true particularly in rotating the disc-shaped recording medium at a higher speed so as to increase its memory capacity. Secondly, when the disc-shaped recording medium is deformed for any of reasons, the disc-shaped recording medium will rotate with an increased amount of friction between the first and second liners. This may cause the drive unit to become inoperative.
SUMMARY OF THE INVENTION
It is a main object of the invention to provide an improved disc cartridge which is free from the problems associated with the conventional disc cartridge.
There is provided, in accordance with the invention, a disc cartridge comprising a disc having a center core formed at the center thereof, the disc having signal recording portions formed around the center core on the opposite surfaces thereof, a shell having opposite inner surfaces facing to each other to define a disc receipt space containing the disc supported for rotation therein between the inner surfaces, the shell having a chucking hole through which the center core of the disc is exposed and read-write windows through which the respective signal recording portions are exposed, a shutter mounted for sliding movement on the shell to open and close the read-write windows, and slippery films formed on the respective inner surfaces.
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Limbach & Limbach L.L.P.
Miller Brian E.
Sony Corporation
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