G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) G02F 1/03 (2006.01) G11B 7/0045 (2006.01) G11B 7/013 (2006.01) G11B 7/125 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1153468
ABSTRACT This invention relates to an apparatus and process for writing video information in the form of a frequency modulated signal upon a videodisc member and for recovering the video information from the video record. The writing apparatus includes a laser as a source of a laser write beam and a write optical system for directing the stationary laser write beam to a moving videodisc member. The intensity of the focused spot is changeable under the control of a light intensity modulating assembly. This light intensity modulator changes the intensity of the write laser beam with respect to a predetermined threshold intensity sufficient to form a first type of indicia in the coating. A read optical system directs a reading laser beam to impinge upon the successively positioned specular light reflective and non-specular light reflective regions carried by the videodisc member. The reflected light beam is intensity modulated by the specular light reflective and non-specular light reflective regions. The read optical system also directs the reflected light beam to a light sensing circuit for changing the intensity modulated reflected light beam to a corresponding frequency modulated electrical signal which is representative of the video signal stored on the videodisc member.
336287
Disco-Vision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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