Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1988-06-02
1989-07-18
Werner, David
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
360 746, 250571, 242199, G11B 2300
Patent
active
048486981
ABSTRACT:
A method of making and of reading markers at control positions on a length of magnetic tape having light-impeding coatings on opposed sides of a transparent tape substrate. Markers are recorded by directing focused beams to control positions along longitudinal areas of the magnetic tape. The beams have an energy sufficient to ablate the coatings, but to leave the tape substrate intact. Raster scanning of the control position provides rectangular markers at prescribed positions. An optical splitting element is used in reading the markers. The element is a heptagonal prism which receives light from a tape drive and forms two parallel, spaced apart beams which are first directed at separate elevations through the markers in the magnetic tape, then converged to the light sensors in the drive. Preferably the optical path through the prism is a path formed by folding a hexagonal prism, with the fold being a reflective surface.
REFERENCES:
patent: 3706844 (1972-12-01), Besier et al.
patent: 3861619 (1975-01-01), Wolff
patent: 4243891 (1981-01-01), Dobler et al.
patent: 4363059 (1982-12-01), Matsuzawa et al.
patent: 4380032 (1983-04-01), Pfost
Bates Arthur D.
Newell Chester W.
Newell Research Corporation
Schneck Thomas
Werner David
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