Autofocus circuit for a videodisc playback device

Details Autofocus circuit for a videodisc playback device Autofocus circuit for a videodisc playback device

1975-03-03

1976-08-10

Konick, Bernard

Telegraphy

Systems

Simplex-reversing periodic

1791003V, 178 67A, 250201, G11B 1100

Patent

active

039743276

ABSTRACT:
An apparatus is described for reading a flat reflecting record carrier on which information is stored in an optically readable structure, which apparatus, inter alia, includes an objective system for focussing a read beam on the plane of the information structure and a focus detection system which is coupled to an electronic circuit for deriving a control signal for controlling the position of the objective system relative to the plane of the information structure. The electronic circuit is equipped so that the control signal ensures that during locking-in the objective system is moved with a low preferably constant, speed towards the record carrier until the required position is substantially attained, after which the objective system is subject to a high acceleration in the opposite direction.

REFERENCES:
patent: 3873763 (1975-03-01), Janssen
patent: 3876841 (1975-04-01), Kramer
patent: 3876842 (1975-04-01), Bouwhuis

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