Method for writing position-indicating markers on magnetic tape

Details Method for writing position-indicating markers on magnetic tape Method for writing position-indicating markers on magnetic tape

1989-05-25

1991-01-08

Levy, Stuart S.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430945, 346 76L, 3461351, G03C 1494, G01D 1516

Patent

active

049834967

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. The longitudinal extent of these rectangular markers generally conforms to the ANSI Standard for end of tape and beginning of tape marker patterns, while the transverse extent of the markers is greter than the longitudinal extent.

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patent: 4622284 (1986-11-01), West et al.
patent: 4636804 (1987-01-01), Kuder
patent: 4884260 (1989-11-01), Bouldin et al.

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