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Publication numberUST953002 I4
Publication typeGrant
Application numberUS 05/618,246
Publication dateDec 7, 1976
Filing dateSep 30, 1975
Priority dateSep 30, 1975
Publication number05618246, 618246, US T953002 I4, US T953002I4, US-I4-T953002, UST953002 I4, UST953002I4
InventorsArthur Herbert Firester
Original AssigneeRca Corporation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Optical videodisc playback system with plural photodetectors
US T953002 I4
an optical playback system is provided for a record having an information track comprising a succession of depressed areas alternating along the length of the information track with relatively non-depressed areas. Light is diffracted by the track to form a zero diffraction order cone of light, and a pair of differently deviated first diffraction order cones of light, each of the latter having a respective region of overlap with the zero diffraction order cone. A light detector, having four independent photosensitive elements disposed symmetrically about the center of a light accepting region of a common housing, is disposed in the path of the diffracted light so that the light accepting region intercepts the zero diffraction order cone. Two photosensitive elements detect two separate regions of overlap representing the recorded data. The remaining elements provide radial tracking signals. In one embodiment, the light beam is focused on the track as a circular light spot having a spot diameter greater than the track width, while in a second embodiment, the light beam is focused on the track as a substantially elliptical light spot having its major axis transverse to the track and its major axis dimension less than the track width.
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U.S. Classification369/44.41, 369/109.01, 250/570
International ClassificationG11B7/12, G11B7/09
Cooperative ClassificationG11B7/0901, G11B7/12
European ClassificationG11B7/09A, G11B7/12