Focus detection device

Details Focus detection device Focus detection device

1983-06-16

1984-10-02

Adams, Russell E.

G03B 1318

Patent

active

044744480

ABSTRACT:
A focus detection device for detecting the in-focus condition of an objective lens by arranging in rear of an image of an object to be photographed by said objective lens, second-image forming lenses for reforming said object image on the surfaces of photo-sensitive elements, wherein the output signals from said photo-sensitive elements are used to indicate the detection of the in-focus condition, whereby said second-image forming lenses are constructed in proper form to increase the accuracy of detection of the in-focus condition.

REFERENCES:
patent: 4180309 (1979-12-01), Miyata et al.

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