Focus detecting camera

Details Focus detecting camera Focus detecting camera

1994-12-09

1996-10-15

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Optical detail with photoelement system

G03B 1336

Patent

active

055659560

ABSTRACT:
A focus detecting device for use in a camera or the like increases the probability of capturing a desired object in a view finder by a light-receiving unit having a small width in a projected image when a focus frame in a view finder is placed on the object. The device includes a phototaking optical system for forming a primary image of the object on the phototaking image frame, a focus detecting optical system for re-imaging the primary image as second images, an image sensor including first and second light-receiving units for receiving the secondary images and a focus detecting calculation unit for detecting the focus state of the phototaking optical system from the output of the image sensor.

REFERENCES:
patent: 4497561 (1985-02-01), Suzuki
patent: 4563576 (1986-01-01), Matsumura et al.

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