Variable pitch grooved label for video disc

Details Variable pitch grooved label for video disc Variable pitch grooved label for video disc

G - Physics

11

B

352/33.14

G11B 7/00 (2006.01) G11B 5/82 (2006.01) G11B 19/12 (2006.01) G06K 19/06 (2006.01)

Patent

CA 1161954

RCA 75,269 ABSTRACT A video disc record suitable for use with a video disc player apparatus is provided with a label for identi- fying the program material stored on the surface of the record. The label is formed in a machine readable format which comprises grooves in the surface of the record. In one format whorls of a spiral groove of a first pitch are spaced alternately with whorls of a spiral groove of a second pitch. A readout apparatus comprises a light beam which is arranged to scan the grooved label and a detector which is arranged to sense the light beam reflected from the disc record surface. Light striking a grooved section of first pitch is reflected in a substantially specular direction while light striking a grooved section of second pitch is substantially scattered out of the specular direction. The detector is arranged to collect the light reflected into the specular direction.

374768

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