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US 4,102,515 AGranted
Tape cassette
AssigneeU.S. Philips Corporation
InventorLodewijk Luciaan Milants
Life of this patent
Estimating the term…
Abstract
A cassette for magnetic tape recordings, having a casing with bottom and cover walls, between which two winding hubs for the tape are captured. A corrugated plastic film is located between the tape winding and the bottom and cover wall respectively, the spring constant of the corrugated film ranging from about 100 to 400 grams/mm. A flat film is disposed between the tape winding and the corrugated film to ensure even distribution of forces exerted on the tape.
Claims2
A cassette for magnetic recording tape, comprising a casing having a bottom wall, a cover wall, and side walls;
- two winding hubs for winding and unwinding the tape respectively, fitted within the casing, and adapted for receiving a tape winding about said hubs between the bottom and cover walls;
- first and second corrugated films located between the tape winding and said bottom and cover walls respectively;
- and first and second flat films disposed between said corrugated films and said tape winding respectively, wherein said corrugated films are resilient films having parallel corrugations and having a material composition, thickness, corrugation height and number of corrugations per centimeter selected to produce a spring constant having value between approximately 100 and 400 grams/mm.
Dependencies are inferred from the claim text.