Apparatus for reading an optically readable reflecting informati

Details Apparatus for reading an optically readable reflecting informati Apparatus for reading an optically readable reflecting informati

1975-09-04

1977-03-08

Habecker, Thomas B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 358128, G11B 700

Patent

active

040114007

ABSTRACT:
An apparatus is described for reading a radiation-reflecting record carrier on which information is stored in an optically readable track-shaped phase structure. The apparatus inter alia includes a radiation source, an objective system and a radiation-sensitive detection system. By a suitable arrangement and a suitable choice of the power of a cylindrical lens, which lens in conjunction with a four-quadrant detector supplies a focussing signal, it is possible to detect centering-errors with the aid of only two additional detectors in the plane of the four-quadrant detector.

REFERENCES:
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3913076 (1975-10-01), Lehurenu
patent: 3932701 (1976-01-01), Adler

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