Focus detecting apparatus independent of object image contrast

Details Focus detecting apparatus independent of object image contrast Focus detecting apparatus independent of object image contrast

1986-10-24

1989-02-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354402, 358227, G02B 700

Patent

active

048048313

ABSTRACT:
In an automatic focusing apparatus, a focus detecting device having detecting means for detecting the width of the edge part of the image of an object to be photographed and discriminating means for discriminating a focused state on the basis of the size of the detected width is arranged to determine by the discriminating means the apparatus to be out of focus when the width of the edge part of the object image is wide and to be in focus when the width of the edge part is narrow, so that the focus detecting device can operate without being affected by difference in the kind and the contrast of the object to be photographed.

REFERENCES:
patent: 4379632 (1983-04-01), Dedden et al.
patent: 4542289 (1985-09-01), Yokoyama et al.
patent: 4568168 (1986-02-01), Sakai et al.
patent: 4600832 (1986-07-01), Grund
patent: 4616264 (1986-10-01), Pshtissky

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