Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1989-05-12
1991-02-19
Levy, Stuart S.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
242186, 242199, 360 746, 360132, G11B 2306
Patent
active
049936611
ABSTRACT:
An optical tape leader detection system includes a light source and a light detector. In a video cassette using opaque magnetic tape, the tape follows a defined tape path and has a transparent leader at each end thereof, with the free ends of the leader being mounted to first and second tape winding hubs. A light transmissive cassette cover supports the first and second hubs, and a source receiving aperture in the cassette cover is adapted to receive the light source. A window is provided in the cassette cover, allowing light emitted from the light source and passing through the transparent leader portion to reach the light detector along a defined light path. One or more light pipes are mounted in the cassette cover and aligned to define portions of that light path, thereby controlling the source and amount of light with respect to the light detector.
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duBois Steven M.
Levy Stuart S.
Minnesota Mining and Manufacturing Company
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