Optical player with half wave plate

Details Optical player with half wave plate Optical player with half wave plate

1976-04-02

1980-05-13

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

179100, 179 3V, 250201, H04N 576

Patent

active

042031338

ABSTRACT:
The present invention relates to the reading out of a track by means of a light spot which scans a track along which the information contained in a record is transcribed. The object of the invention is a read-out system which ensured focussing and tracking by the synchronous detection of positional errors with the help of a read-out beam one of the halves of which is intercepted by a half-wave plate; an oscillatory motion is imparted to the read-out spot in the plane containing the track.

REFERENCES:
patent: 3501586 (1970-03-01), Russell
patent: 3663763 (1972-05-01), Trost
patent: 3875401 (1975-04-01), Stauffer
patent: 3876841 (1975-04-01), Kramer
patent: 3931459 (1976-01-01), Korpel
patent: 3932700 (1976-01-01), Snopko
patent: 3971002 (1976-07-01), Bricot
patent: 3975630 (1976-08-01), Zorn
University Physics, by Sears and Zemansky, Addison-Wesley Publishing Co. Inc., .COPYRGT.1962, pp. 877-878.

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