Moving system for a videodisk reader-recorder

Details Moving system for a videodisk reader-recorder Moving system for a videodisk reader-recorder

1981-01-21

1983-11-08

Konick, Bernard

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

G11D 708

Patent

active

044146574

ABSTRACT:
The track of a videodisk is followed by a reading light beam produced by a device comprising a reading head fixed on a carriage which forms part of the moving system of a videodisk reader-recorder and is capable of radial displacement along the disk. An objective support frame is capable of displacement in a vertical direction with respect to the carriage in order to maintain focusing of the reading beam and of rotational displacement with respect to the carriage about a transverse axis at right angles to the radial and vertical axes in order to maintain the light beam on the track-following path. Flat coils located vertically in a plane parallel to the carriage path and placed within air-gaps of magnetic circuits serve to develop vertical forces which lift the reading head and initiate the vertical and rotational displacements by means of a differential supply circuit.

REFERENCES:
patent: 3530258 (1970-09-01), Gregg et al.
patent: 4092529 (1978-05-01), Aihara et al.
patent: 4135083 (1979-01-01), Van Alem et al.
patent: 4302830 (1981-11-01), Hamaoka et al.
patent: 4318145 (1982-05-01), Frandsen
patent: 4321701 (1982-03-01), Arquie et al.

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