Focus detecting and indicating device for camera

Details Focus detecting and indicating device for camera Focus detecting and indicating device for camera

1980-02-04

1986-12-09

Perkey, William B.

G03B 300

Patent

active

046277005

ABSTRACT:
A camera including an electronic focus detecting device and an optical display device for indicating whether the photographing lens of the camera is at a rear focus position, a front focus position or a correct focus position and for indicating whether the lens is being moved in the correct direction towards the position of correct focus. First and second photoelectric conversion element arrays are disposed in front of and behind a position which is optically equivalent to the position of the film surface in the camera. Signals are produced from the respective outputs of the arrays which are in proportion to the degree of focus than existing. A different signal is produced as well and the three signals are then processed to determine the indicated positions in a disclosed circuit arrangement.

REFERENCES:
patent: 4230401 (1980-10-01), Tokutomi et al.

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