H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/32.2
H04N 5/781 (2006.01) G11B 7/005 (2006.01) G11B 7/08 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01) G11B 19/28 (2006.01) G11B 21/10 (2006.01)
Patent
CA 1140675
ABSTRACT A video disc player is described for use with a video disc having frequency modulated video informa- tion recorded thereon in the form of a plurality of con- centric circles or a single spiral. The information track comprises successively positioned light reflective and light non-reflective regions. A focused light beam is caused to be positioned over the center of an in- formation track and the light reflected from the inform- ation track is gathered by an objective lens for appli- cation to electronic circuitry for recovering the re- corded frequency modulated video signals. Radial tracking means are described for maintaining the focused light spot to impinge upon the center of an information track. Lens focusing means are described for positioning the objective lens at the optimum focused position above the information track for gathering the maximum amount of reflected light from the information track. FM processing means are described for reconstructing the recovered frequency modulated video information such that the ratio between the amplitude of the signals as recorded is essentially the same in the signals as recovered from the video disc member. Further servo means are described for handling the selective change of the intersection of the reading beam with the video disc member in a predetermined preferred mode of oper- ation.
322447
Ceshkovsky Ludwig
Dakin Wayne R.
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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