Wavelength selective optical recording and reproducing device

Details Wavelength selective optical recording and reproducing device Wavelength selective optical recording and reproducing device

1988-06-20

1990-09-11

Gossage, Glenn

Static information storage and retrieval

Radiant energy

Color centers

365106, 365215, 369106, 372 32, G11C 1300

Patent

active

049568124

ABSTRACT:
A wavelength selective optical recording and reproducing device has a reference wavelength in a marker hole of a medium. The optical detector is adapted to detect light which is reflected from or transmitted through the marker hole. A phase detector detects the phase of an output of the optical detector by using a high frequency signal as a reference to obtain a signal indicative of the deviation of the wavelength of the output from a desired wavelength. A wavelength regulator is responsive to the wavelength deviation to control the wavelength of the light source to be the desired wavelength.

REFERENCES:
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patent: 4150392 (1979-04-01), Johnston, Jr. et al.
patent: 4363961 (1982-12-01), Okada et al.
patent: 4709417 (1987-11-01), Kuwabara
patent: 4819206 (1989-04-01), Yoshimura
patent: 4833681 (1989-05-01), Akiyama et al.
patent: 4855951 (1989-08-01), Tomioka et al.

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