G - Physics
11
B
352/32
G11B 23/02 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1147057
ABSTRACT This invention relates to an apparatus and process for writing video information in the form of a frequency modulated signal upon a video disc member and for recover- ing the video information from the video record is de- scribed. The video disc member formed by the writing apparatus is also described. The writing apparatus in- cludes 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 video disc member. The video disc member comprises a substrate member carrying a light responsive coating on at least one surface. The write optical system focuses the beam to a small spot of light approximately one micron in diameter upon the light re- sponsive layer. The intensity of the focused spot is changeable under the control of a light intensity modu- lating 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 system is employed to retrieve the video signal stored on the video disc member. This read system includes a read laser for generating a read beam, and a motion control assembly for rotating and translating the video disc member relative to the read light beam. A read optical system directs the read beam to impinge upon the successively positioned specular light reflective and non-specular light reflec- tive regions carried by the video disc member. The read optical system also collects the light reflected from these regions. 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 video disc member.
404059
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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