Optical recording disc

Details Optical recording disc Optical recording disc

1987-12-15

1990-01-02

McElheny, Jr., Donald

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

048918008

ABSTRACT:
An optical recording disc provided with a substrate permeable to a red laser beam for reading data recorded and having a single pass transmissivity of 85% or more in a wave length region of said laser beam and a light absorption edge of shorter wave length side positioned at 600 nm or more and capable of preventing a misregeneration due to an external light having been incident upon an optical system without reducing the regenerating performance.

REFERENCES:
patent: 4581317 (1986-04-01), Simmons, III
patent: 4614951 (1986-09-01), Osato et al.
patent: 4678736 (1987-07-01), Hanamura et al.
patent: 4719613 (1988-01-01), Hirose et al.

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