Tape cassette
AssigneeSony Corporation
InventorHiroyuki Kiso
Life of this patent
Estimating the term…
Abstract
In an inner surface of a lower flange of the magnetic tape reel, 6 concave portions each shaped in nearly as isosceles triangle are made formed at even angle intervals of 60 degrees with their circumferential cross-section area being larger as approaching to a hub. When a magnetic tape is wound on the hub, air which exists between a tape-winding surface of the hub or the tape already wound and the tape to be wound further is guided to the concave portions, and an amount of wound-in air becomes less in the inner side and large in the outer periphery. Consequently, a pressure of winding the tape tight at the outer periphery does not reach the inner side, so that winding irregularities or deformation of the tape do not occur.
Claims11
A tape cassette comprising
- a tape reel including a hub unit for winding a tape and a flange provided at said hub unit, and
- a tape shell for housing said tape reel, wherein
- said flange has plural concave portions for escaping air on an inner surface, and
- each cross-section area of each of said concave portions is made larger as approaching to the inner side nearer to said hub unit.
A magnetic tape cassette comprising:
- a magnetic tape;
- a hub unit for winding said magnetic tape,
- at least a flange provided at said hub unit, and
- a tape cassette shell for housing said magnetic tape, said hub unit and said flange;
- wherein
- said flange has plural concave portions on an inner surface, and each of said concave portions is made larger in its cross-section area as approaching toward said hub unit.
A tape reel comprising:
- a hub unit for winding a tape;
- and
- at least one flange attached to said hub unit, wherein
- said flange has plural concave portions and each of said concave portions being made narrower toward an outer periphery of said flange.
Dependencies are inferred from the claim text.