G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) G11B 7/005 (2006.01) G11B 7/08 (2006.01) G11C 13/04 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1082356
ABSTRACT: A record carrier is described with an optically readable trackwise-arranged information structure, and an apparatus for reading said carrier. The distances between the tracks of the information structure vary. By projecting at least one address spot; on the information structure, in addition to a read spot, which address spot covers a number of tracks which approximately equals the quotient of the average track distance and the amplitude of the track distance variation, the read spot can be rapidly addressed to a specific group of tracks with the aid of two detec- tors which are disposed in the path of the address- beam radiation which is diffracted in a first order by the information structure in a direction transverse to the track direction.
259653
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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