Optical system for reflective mode video playback apparatus

Details Optical system for reflective mode video playback apparatus Optical system for reflective mode video playback apparatus

1975-11-04

1977-08-23

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 250201, 350 6, 350 54, H04N 576

Patent

active

040443787

ABSTRACT:
An optical system for deriving an output signal from a video disc record that is reflective to a reading beam includes means for directing a reading beam along a predetermined optical path to a reading plane and then to a light detector. A reading lens, having a back focal plane, is positioned in this optical path to focus the beam on the storage track of the record which is positioned in the reading plane. This lens also returns energy reflected from the record track along the optical path to the light detector. A mirror, which is displaceable about a reference axis, is disposed across the optical path with such reference axis effectively positioned in the back focal plane of the reading lens. A beam-splitter, also disposed across the optical path, is spaced from the mirror in the direction of the light source in order to deflect reflected energy out of the optical path and toward the light detector.

REFERENCES:
patent: 3669522 (1972-06-01), Anderson
patent: 3771850 (1973-11-01), Casler
patent: 3829622 (1974-08-01), Elliot
patent: 3932701 (1976-01-01), Adler
"University Physics"; by Sears and Zemansky; c 1962 Addison-Wesley Publishing Co., Inc. pp. 779-780.

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