Optical memory device

Details Optical memory device Optical memory device

1985-06-19

1986-11-04

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369 46, G11B 2736, G11B 700

Patent

active

046213520

ABSTRACT:
An optical memory device comprises a modulator for modulating a laser beam in accordance with recording data, an objective lens for focusing the output laser beam from the modulator on a recording medium, a photosensor arranged at the conjugate position with the focal point of the objective lens, and a judging circuit for detecting erroneous writing in accordance with an output from the photosensor and a source of the recording data. The photosensor is divided into first and second segments by a line which is perpendicular to a direction corresponding to relative movement of the focused light beam on the recording medium. The difference signal between the outputs from the first and second segments is supplied to the judging circuit.

REFERENCES:
patent: 4065786 (1977-12-01), Stewart
patent: 4171879 (1979-10-01), Bricot
patent: 4225873 (1980-09-01), Winslow
patent: 4283777 (1981-08-01), Curry
patent: 4355318 (1982-10-01), Miyauchi
patent: 4399529 (1983-08-01), Leterme
patent: 4426693 (1984-01-01), Satoh
patent: 4554654 (1985-11-01), Kato

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