Focusing system for videodisc player

Details Focusing system for videodisc player Focusing system for videodisc player

H - Electricity

04

N

352/32.21, 88/94

H04N 5/76 (2006.01) G02B 27/40 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1055605

ABSTRACT OF THE DISCLOSURE A focus detector includes apertured photodetect- ors which intercept a radiant beam. Changes in focus dif- ferentially affect the amount of radiation impinging on the detectors resulting in corresponding changes in their signal output. A videodisc system employing the detector moves a focusing lens to compensate for variations in the position of a target videodisc, so that a scanning beam is always accurately transmitted to a detector. A dif- ference circuit connected to two photodetectors generates a driving signal to energize a lens-moving motor for shifting the focusing lens toward or away from the video- disc. -1-

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