Disc cartridge with slippery film to reduce friction and...

Dynamic magnetic information storage or retrieval – Record medium – In container

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.


REFERENCES:
patent: 4814926 (1989-03-01), Gulbrandsen
patent: 4885652 (1989-12-01), Leonard et al.
patent: 4888761 (1989-12-01), Ohta
patent: 4899244 (1990-02-01), Morse
patent: 4958249 (1990-09-01), Kadokura et al.
patent: 5085723 (1992-02-01), Nakaki et al.
patent: 5179487 (1993-01-01), Niitsuma et al.
patent: 5241441 (1993-08-01), Yamada et al.
patent: 5247416 (1993-09-01), Shiba et al.
patent: 5282106 (1994-01-01), Saito et al.
patent: 5311389 (1994-05-01), Howey
patent: 5582901 (1996-12-01), Howey et al.
patent: 5587860 (1996-12-01), Umebayashi et al.
patent: 5682360 (1997-10-01), Oshima
patent: 5773137 (1998-06-01), Niitsuma et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Disc cartridge with slippery film to reduce friction and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc cartridge with slippery film to reduce friction and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc cartridge with slippery film to reduce friction and... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2436552

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.