Focus detecting device for camera

Details Focus detecting device for camera Focus detecting device for camera

1980-07-09

1981-12-29

Hartary, Joseph W.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 31, 354152, 250204, G03B 300, G03B 1912, G01J 110

Patent

active

043079474

ABSTRACT:
A focus detecting device for a camera in which a portion of the light passing through a photographing lens is reflected to a first surface of a plane plate of transparent material. After passing through the plane plate, the beam is split by a half-silvered mirror with one beam emerging from the half-silvered mirror and plane plate while the other is reflected back through the plane plate towards the first surface. At the first surface, the second beam is reflected back again through the plane plate emerging therefrom at a point removed from the half-silvered mirror striking a second sensor located in the same plane as the first sensor. The outputs from the sensors, which are preferably linear arrays of photodiodes, are processed to provide a focus detecting signal which is further processed to provide signals indicating front focus, correct focus and rear focus.

REFERENCES:
patent: 3185059 (1965-05-01), Durst

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