Optical videodisc read unit with tracking and focussing wobblers

Details Optical videodisc read unit with tracking and focussing wobblers Optical videodisc read unit with tracking and focussing wobblers

1978-05-15

1980-03-11

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003Z, 17910041P, G11B 712, G11B 708

Patent

active

041930916

ABSTRACT:
An optical read unit for reading radiation-reflecting video discs comprises a semiconductor laser which with the aid of a scan wobbler and a focussing wobbler is moved at high frequency in two directions relative to the video disc, a radial direction for tracking purposes and a direction normal to the disc for the purpose of automatic focussing. The semiconductor diode laser is mounted on a metal radiation source carrier which is connected to a heat sink for carrying off the heat with a low temperature gradient, and is driven by piezo-electric plates.

REFERENCES:
patent: 3349174 (1967-10-01), Warschauer
patent: 4005259 (1977-01-01), Kaneko
patent: 4032776 (1977-06-01), Rosmalen
patent: 4092529 (1978-05-01), Aihara et al.

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