Optical record playback apparatus employing light frequency at w

Details Optical record playback apparatus employing light frequency at w Optical record playback apparatus employing light frequency at w

1977-10-31

1980-08-26

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 346 76L, 3461351, 365124, H04N 576, G11B 700

Patent

active

042198488

ABSTRACT:
For playback of a disc record information track, in which regions of a light reflective surface overlaid with a layer of light absorptive material alternate with regions of said light reflective surface free of said overlying absorptive material, light of a constant intensity is focused on the information track as the disc is rotated. The focused light is of insufficient intensity to effect ablation of the remaining absorptive material, but is of a frequency at which the overlaid regions of the coated disc exhibit an anti-reflection condition. A photodetector, positioned to receive light reflected from the information track as the pits pass through the path of the focused light, develops a signal representative of the recorded information.

REFERENCES:
patent: 3560994 (1971-02-01), Wolff et al.
patent: 3665483 (1972-05-01), Becker et al.
patent: 3747117 (1973-07-01), Fechter
patent: 3889272 (1975-06-01), Lou et al.
patent: 3959799 (1976-05-01), Gambino et al.
patent: 3983317 (1976-09-01), Glorioso
patent: 4000492 (1976-12-01), Willens
Seqs et al., University Physics, 2nd edition, 5th printing, Nov. 1962, p. 843, Addison-Wesley Publishing Co., Inc.

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