G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/00 (2006.01)
Patent
CA 1057399
ABSTRACT OF THE DISCLOSURE The present invention relates to reading of stored information from a videodisc. Attempts have been made in the prior art to read information from video- discs to produce a video signal having its amplitude varying with time. Through the entire process of re- cording to reading, however, poor quality of the repro- duced signal can result due to the format of the recorded signal and the manner of reading. The present invention overcomes these deficiencies by providing an improved apparatus and method for reading stored information on videodiscs, the information being in the form of a lineal series of regions of alternately high and low reflectivity in a direction normal to the disc surface. In accordance with the invention, the reading system includes a polarized collimated beam of light, and an optical system between the light source and the video- disc for focusing the reading beam upon the videodisc. Relative motion is provided between the reading beam and the alternate regions for generating reflections from the high light reflective regions on the video- disc. A light sensor is responsive to the reflections for generating a frequency modulated electrical signal caused by the reflections. The reproduced frequency modulated signal has its informational content in the form of a carrier frequency which has a frequency vary- ing with time.
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