Optical disc

Details Optical disc Optical disc

1991-03-12

1993-02-16

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 369288, 346 76L, 3461351, B32B 300

Patent

active

051869942

ABSTRACT:
An optical disc having an aluminum reflective film is disclosed, wherein an oxide of Al in the stable oxidized state is introduced into the Al reflective film to eliminate changes with lapse of time to improve durability of the optical disc. A method for producing a reflective film on an optical disc is also disclosed, wherein a trace amount of oxygen is introduced into atmosphere in the course of formation of the reflective film.

REFERENCES:
patent: 4457598 (1984-07-01), Shimabukuro et al.
patent: 4578684 (1986-03-01), Gupta et al.
patent: 4635076 (1987-01-01), Willson et al.
patent: 4651172 (1987-03-01), Watanabe et al.
patent: 4786538 (1988-11-01), Saito
patent: 4933239 (1990-06-01), Olson
patent: 4959243 (1990-09-01), Steininger et al.
patent: 5055356 (1991-10-01), Minowa

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