G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 11/18 (2006.01) G11B 7/09 (2006.01) G11B 7/13 (2006.01) G11B 11/105 (2006.01)
Patent
CA 1096494
PHN 829 1 3.3.76 ABSTRACT: An apparatus is described for reading a record carrier, on which information, for example video and/or audio information, is stored in an optically readable track-shaped information structure. Errors in the focus- sing of a read beam relative to the plane of the infor- mation structure can be detected with the aid of two detectors which are disposed in the far field of the information structure, which detectors are arranged at one side of a plane defined by the optical axis of an objective system and a line which effectively extends transversely to the track direction and which longitudinal direction are effectively transverse to the track direction. With the aid of the same detec- tors a reference signal is obtained, which is employed for deriving a control signal for focussing correction of the read beam. - 36 -
270466
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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