Data recording system for optical memory tape

Details Data recording system for optical memory tape Data recording system for optical memory tape

1988-06-22

1989-11-28

Michl, Paul R.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

369 97, 369122, 346 76L, 3461351, 430275, 430616, 430945, G11B 7007, G11B 1103, G11B 2506

Patent

active

048842605

ABSTRACT:
A system for recording data onto optical tape by means of a laser. The optical tape may be disposed on reels and transported along a tape path between supply and takeup hubs. A laser or laser array is used to write data on the tape in a plurality of parallel tracks as it is driven along the tape path. The tape features a flexible web backing, a reflective metallic layer deposited over the backing and an optical storage layer on top of the metallic layer with a planar crust of irregular, nonfilamentary and oblong black silver particles within the top one-half micron of the storage layer and substantially clear gelatin below the crust. The tape may have prepatterned indica, such as servo track guides or timing marks. Laser recording modifies the black silver particles of the crust to expose the reflective underlayer through the clear gelatin. The laser at low power together with a light detector may be used to read the data, an optical reflective contrast ratio of at least 1.2 to one being sufficient to distinguish the data spots from the surrounding field.

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