Optical card and method for reading information recorded in it

Details Optical card and method for reading information recorded in it Optical card and method for reading information recorded in it

1990-09-11

1993-09-28

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430273, 430495, 430945, 369100, 369109, 3692751, 3692753, 369284, 346 76L, 3461351, G03C 172, G11B 724

Patent

active

052485846

ABSTRACT:
An optical card comprises a transparent substrate having a track groove on its surface, an optical recording layer provided on said track groove, and an opaque card substrate provided in such a manner that it may be contiguous to said optical recording layer, wherein an unrecordable part is provided at an end of said track groove formed on the surface of the transparent substrate.

REFERENCES:
patent: 4500777 (1985-02-01), Drexler
patent: 4656121 (1987-04-01), Sato et al.
patent: 4673626 (1987-06-01), Takeda et al.
patent: 4680456 (1987-07-01), Drexler
patent: 4766054 (1988-08-01), Hirose et al.
Pat. Abs. Japan, vol. 10, No. 338 (1986) 139952.
Pat. Abs. Japan, vol. 11, No. 142 (1987) 278055.

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