Device for detecting sharp focusing

Details Device for detecting sharp focusing Device for detecting sharp focusing

1981-10-21

1983-07-19

Perkey, William B.

354 59, 354145, G03B 1318, G03B 1505

Patent

active

043940773

ABSTRACT:
Image focusing device especially adapted for use in single-lens reflex cameras. A light-beam emission or projection means is incorporated in each interchangeable photographic lens in such a way that the direction of the light beam emitted or projected therefrom can be varied in response to the axial displacement of a lens group for focusing an object. The light rays which are reflected from the object and pass through the photographic lens along and in the vicinity of its optical axis are intercepted by a photodetection means disposed within a camera body, whereby whether or not the photographic lens is sharply focused at the object can be detected.

REFERENCES:
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 4067030 (1978-01-01), Kuramoto et al.
patent: 4150888 (1979-04-01), Filipouich

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