Apparatus for reading a flat record carrier with an...

Details Apparatus for reading a flat record carrier with an... Apparatus for reading a flat record carrier with an...

G - Physics

11

B

352/32.21

G11B 7/00 (2006.01) G11B 7/005 (2006.01) G11B 7/09 (2006.01) G11B 7/13 (2006.01) H04N 5/76 (2006.01)

Patent

CA 1072679

ABSTRACT: An apparatus is described for reading a flat record carrier on which information is stored in an optically readable information structure comprising a number of tracks. By the arrangement in the "far field" (as defined) of the information structure and on 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 centre-line of the track portion to be read, there is provided 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 a direct- ion transverse to the tracks. Centring and focussing errors can be detected without the use of auxiliary beams and additional optical elements.

246519

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