High contrast optical memory tape

Details High contrast optical memory tape High contrast optical memory tape

G - Physics

03

C

352/32.4

G03C 1/00 (2006.01) G03C 5/00 (2006.01) G11B 7/24 (2006.01) G11B 7/251 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 1297581

Abstract of the Disclosure A medium in tape form for laser recorded opti- cal information featuring a gelatin layer having a thin black crust at the top of the layer. The crust is formed by developed black filamentary silver particles within the top 0.5 micron of a gelatin colloid matrix. The remainder of the colloid matrix is substantially clear gelatin and a reflective metallic layer is disposed below the gelatin. The tape may be disposed on reels and may be pre-patterned during formation of the crust with indi- cia, such as servo track guides or timing marks. User data may be recorded by modification or by displacing the black silver particles in the crust with a laser to expose the reflective underlayer. A laser or other light source is used to read data on the medium with optical contrast between the black surface and the reflective metallic layer underlying the gelatin layer which can be observed in the recorded spots.

552945

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