Reproducing-only and recordable-reproduceable optical discs and

Details Reproducing-only and recordable-reproduceable optical discs and Reproducing-only and recordable-reproduceable optical discs and

1987-03-18

1988-03-29

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369275, G11B 700

Patent

active

047349042

ABSTRACT:
The combination of recordable-reproduceable optical discs and reproducing-only optical discs and an optical disc player which is capable of reproducing recorded signals both from the recordable-reproduceable optical disc possessing pregrooves and the reproducing-only optical disc possessing recording pits by means of a common optical system. The common optical system has a common laser for irradiating both types of discs with a laser beam used for reading the discs. The wavelength of the laser is .lambda. and the depth or height of the pregrooves of the recordable-reproduceable optical disc is made equal to or less than .lambda./8n, and the depth or height of the recording pits of the reproducing-only optical disc is made equal to or greater than .lambda./8n but less than .lambda./4n, wherein n is the refractive index of the substrate of the disc or the protective layer provided on the surface thereof.

REFERENCES:
patent: 3914595 (1975-10-01), Tinet
patent: 4325135 (1982-04-01), Dil et al.
patent: 4326282 (1982-04-01), Verboom et al.
patent: 4385372 (1983-05-01), Drexler
patent: 4466091 (1984-08-01), Takagi et al.
patent: 4547875 (1985-10-01), Ohta et al.
patent: 4553228 (1985-11-01), Gerard et al.

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