Focus detection system for a video disc player using a plurality

Details Focus detection system for a video disc player using a plurality Focus detection system for a video disc player using a plurality

1976-03-23

1977-09-27

Wolff, John H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003G, H04N 576, G11B 712

Patent

active

040515273

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 focussing of a read beam relative to the plane of the information 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 detectors a reference signal is obtained, which is employed for deriving a control signal for focussing correction of the read beam.

REFERENCES:
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3876842 (1975-04-01), Boowhuis
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 3932700 (1976-01-01), Snopko
patent: 3962720 (1976-06-01), Braat
patent: 3962721 (1976-06-01), De Haan
patent: 3971002 (1976-07-01), Bricot et al.
patent: 3974327 (1976-08-01), Van Dijk
patent: 4006293 (1977-02-01), Bouwhuis et al.

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