Apparatus for detecting a focusing condition of an objective len

Details Apparatus for detecting a focusing condition of an objective len Apparatus for detecting a focusing condition of an objective len

1982-03-29

1984-11-20

Perkey, William B.

3542891, G03B 708, G03B 1720

Patent

active

044836023

ABSTRACT:
In a single-lens reflex camera having an objective lens, a focusing screen and a view finder, a photodetector array is arranged to receive a central part of an object image formed by the objective lens and a focusing condition of the objective lens is detected by calculating an evaluation function from image signals supplied from the photodetectors. A presetting dial for selecting given photodetectors whose image signals are used for detecting the focusing condition is provided at such a position that a part of the dial is exposed to the outside through an opening formed in a rear wall of a camera body at a position underneath a film winding lever. A light emitting diode array is provided on the focusing screen so as to be seen by a user through the view finder. Only desired light emitting diodes are lighted on under the control of a signal supplied by the dial to indicate the region of the photodetector array which is used for detecting the focusing condition.

REFERENCES:
patent: 3354803 (1967-11-01), Winkler et al.
patent: 4047187 (1977-09-01), Mashimo
patent: 4075640 (1978-02-01), Ueda et al.
patent: 4219267 (1980-08-01), Suzuki et al.
patent: 4246476 (1981-01-01), Stauffer
patent: 4279484 (1981-07-01), Kimura
patent: 4297014 (1981-10-01), Nakamura et al.
patent: 4305657 (1981-12-01), Masunaga et al.

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