Device for the optical read-out of a diffractive track belonging

Details Device for the optical read-out of a diffractive track belonging Device for the optical read-out of a diffractive track belonging

1974-06-26

1976-07-20

Hecker, Stuart N.

Communications: electrical

Digital comparator systems

1791003G, 1791003V, 340173LM, G11C 700, G11C 1304, G11B 2110

Patent

active

039710025

ABSTRACT:
The present invention relates to the optical read-out of a diffractive track carried by a data carrier. The object of the invention is an optical read-out device in which concentrated illumination of the track is effected by at least two collateral read-out spots straddling same, in order to produce a track eccentricity signal by subtraction of the voltages furnished by two groups of photo-electric transducers sensitive to the spread in the beams which form said spots.

REFERENCES:
patent: 3703724 (1972-11-01), Thomas
patent: 3829622 (1974-08-01), Elliot
patent: 3876842 (1975-04-01), Bouwhuis
Bouwhuis et al., The Optical Scanning System of the Philips `VLP` Record Player, Philips Tech. Rev. 33, pp. 186-189, Oct. 18, 1973, No. 7.

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