Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Patent
1996-06-13
1998-02-03
Jillions, John M.
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Cartridge system
360132, G11B 2308
Patent
active
057135312
ABSTRACT:
A tape cartridge comprises a base plate, a pair of tape reels rotatably supported by a pair of upstanding reel shafts which shafts are supported on the base plate, and a magnetic tape wound on the tape reels wherein a plurality of tape guides are provided to define a tape travel path. The base plate is formed with an aluminum-alloy plate with a hard protective film on both faces of the aluminum-alloy plate and small impressions in the hard protective film for elimination of residual strain. The hard protective film is formed by an anodic oxidation coating. In order to eliminate residual stress or strain existing in the base plate formed by a punching operation, each of the small impressions is formed by impressing the hard protective film to a depth within a thickness of the hard protective film or to a depth within a permissible limit of deformation (elongation) of the hard protective film.
REFERENCES:
patent: 4949210 (1990-08-01), Satoh et al.
patent: 5468065 (1995-11-01), Ishikawa
patent: 5541797 (1996-07-01), Ping et al.
Kikuchi Shuichi
Sasaki Kazuo
Frommer William S.
Jillions John M.
Sinderbrand Alvin
Sony Corporation
Strimbu Gregory J.
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