Optical medium having pits of different depths, and method and a

Details Optical medium having pits of different depths, and method and a Optical medium having pits of different depths, and method and a

1988-06-28

1990-10-16

Ryan, Patrick

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

430945, 369 48, 369109, G03C 100, G11B 509

Patent

active

049634640

ABSTRACT:
An optical information recording medium includes a plurality of kinds of pits independently representing information and having different depths, wherein the plurality of kinds of pits are formed as portions recessed from the same plane. A method of reproducing information is disclosed, which includes irradiating this medium with a plurality of light beams having different wavelengths corresponding to the depths of the plurality of kinds of pits; and independently detecting the beams modulated by the pits. An optical information reproducing apparatus is also disclosed. The reproducing apparatus includes an optical information recording medium having a plurality of kinds of pits formed in the same plane, each pit independently representing information and having an independently determined depth; an irridating device for irradiating the medium with a plurality of light beams having different wavelengths corresponding to the depths of the plurality of kinds of pits; and a plurality of photodetectors for indepedently detecting a plurality of light beams modulated by the pits.

REFERENCES:
patent: 4041530 (1977-08-01), Kramer et al.
patent: 4322839 (1982-03-01), Yamashita et al.
patent: 4428873 (1984-01-01), Murayama et al.
patent: 4499574 (1985-02-01), Braat
patent: 4556967 (1985-12-01), Braat
patent: 4717508 (1988-01-01), DeMartino

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