G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/08 (2006.01) G11B 21/10 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1071768
ABSTRACT The present invention relates to directing a reading light beam onto the surface of a video disc and receiving a modulated beam reflected therefrom. The prior art attempts to direct light beams to and from a video disc involved directing the incident and reflected beam portions along totally separate optical paths, resulting in bulky and complex playback appara- tus. The present invention provides an improved apparatus and method for directing the incident and reflected light beams along a common path portion. In accordance with the invention, a light source is provided for producing a reading beam of light radiation. The reading beam is directed from the light source along an optical path to the information track of the video disc. The reading beam is modulated and reflected by the information track to retrace at least a portion of the path. A senor receives the reflected beam of radiation from the information track. The means for directing the reading beam includes a device portioned along the portion of the path common to the reading beam and the reflected beam for directing the reflected beam out of the path of the reading beam and toward the sensor. The beam separator may comprise a beam splitting prism, and a quarter wave plate disposed between the prism and the video disc.
314705
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