Automatic focussing device

Details Automatic focussing device Automatic focussing device

1978-09-08

1980-09-16

Hecker, Stuart N.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, H04N 576

Patent

active

042233488

ABSTRACT:
An automatic focussing device which functions to bring a video disc surface in focus with an optical system is disclosed. The device comprises a hologram for producing a focussing luminous flux having astigmatism with or without coma and a video signal reading out luminous flux without having astigmatism with or without coma, a relay lens having an optimum image forming plane, and an objective lens arranged such that said optimum image forming plane and said video disc surface are conjugate with respect to said objective lens.

REFERENCES:
patent: 3992574 (1976-11-01), Bouwhuis et al.
patent: 4025949 (1977-05-01), Whitman
patent: 4118736 (1978-10-01), Okada et al.
patent: 4123652 (1978-10-01), Bouwhuis

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