Apparatus for reading a flat record carrier with an optically re

Details Apparatus for reading a flat record carrier with an optically re Apparatus for reading a flat record carrier with an optically re

1975-04-16

1977-02-01

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 1791003G, H04N 576, G11B 712

Patent

active

040062937

ABSTRACT:
An apparatus is described for reading a flat record carrier on which information is stored in an optically readable track-shaped information structure. By the arrangement in the far field of the information structure and at one side of a plane which is formed by the optical axis of an objective system which is used for reading and a line parallel to the center line of the track portion to be read, of a radiation-sensitive detection system which consists of at least two detectors in approximately the position .beta./2, .beta. being the angle at which a first-order beam is diffracted in the lateral direction of the tracks, centering and focussing errors can be detected without the use of auxiliary beams and additional optical elements.

REFERENCES:
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 3919465 (1975-11-01), Holler et al.

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