Title: Optical videodisc read unit with tracking and focussing wobblers

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.

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Inventors: Kleuters, Wilhelm J. (Eindhoven, NL)
Van Rosmalen, Gerard E. (Eindhoven, NL)
Bierhoff, Martinus P. M. (Eindhoven, NL)
Immink, Kornelis A. (Eindhoven, NL)

Application Number: 905890
Filing Date: 1978-05-15
Publication_date: 1980-03-11
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 369/112.23 369/44.15, 369/111
Other Classes:
US Patent Ref:

3349174	Oct, 1967	Warschauer	179/100.
4005259	Jan, 1977	Kaneko	358/128.
4032776	Jun, 1977	Rosmalen	358/128.
4092529	May, 1978	Aihara et al.	358/128.

Other Refs:
Primary Examiner: Konick, Bernard
Assistant Examiner: McElheny, Jr., Donald
Attorney: Briody; Thomas A., Streeter; William J., Cohen; Simon L.