Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1980-03-17
1982-05-25
Konick, Bernard
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
3581285, 250202, 360 77, 360 10, G11B 2110
Patent
active
043320228
ABSTRACT:
A video disc player is described for use with a video disc having frequency modulated video information recorded thereon in the form of a plurality of concentric 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 information track and the light reflected from the information track is gathered by an objective lens for application to electronic circuitry for recovering the recorded 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 operation.
REFERENCES:
patent: Re29963 (1979-04-01), Janssen
patent: 3381086 (1968-04-01), De Moss
patent: 3530258 (1970-09-01), Gregg
patent: 3911211 (1975-10-01), Rennick
patent: 4037252 (1977-07-01), Janssen
patent: 4057832 (1977-11-01), Kappert
patent: 4137430 (1979-01-01), Muraoka
Ceshkovsky Ludwig
Dakin Wayne R.
Clark Ronald J.
Discovision Associates
Faber Alan
Konick Bernard
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