Optical read-out system including asymetrical beam intensity and

Details Optical read-out system including asymetrical beam intensity and Optical read-out system including asymetrical beam intensity and

1976-09-24

1977-11-22

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 250201, 250202, 250570, H04N 576, G11B 712

Patent

active

040598411

ABSTRACT:
The invention relates to the optical reading of a support comprising a track along which is arranged a series of information items which optically translate a carrier wave angularly modulated by the information. The read-out system uses a single lens for projecting a quasi-punctiform spot onto the support; a photodetector comprising four cells arranged in a square and asymmetrical illumination of the lens to ensure detection of the information and simultaneous supply of defocussing and tracking deviation signals.

REFERENCES:
patent: T953002 (1976-12-01), Firester
patent: 3909608 (1975-09-01), LeMerer et al.
patent: 3913076 (1975-10-01), Lehureau
patent: 3962721 (1976-06-01), Dettaan
patent: 3971002 (1976-06-01), Bricot et al.
patent: 3983317 (1976-09-01), Glorioso
patent: 3991275 (1976-11-01), Boulthuis
patent: 4001494 (1977-01-01), Adler
patent: 4006293 (1977-02-01), Bouwhuis
patent: 4011400 (1977-03-01), Simons et al.
patent: 4025949 (1977-05-01), Whitman

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