Automatic focus control device for camera

Details Automatic focus control device for camera Automatic focus control device for camera

1989-05-16

1990-04-10

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502012, G03B 310

Patent

active

049164724

ABSTRACT:
An auto-focus camera includes focus detection means for detecting the focussing state of a photographic lens, reliability discriminating means for discriminating whether the result of the focus detection means is reliable, first drive control means for driving the photographic lens to a position determined from the result of the focus detection means when the reliability discriminating means discriminates that the result is reliable, second drive control means for driving the photographic lens in a predetermined direction when the reliability discriminating means discriminates that the result is unreliable, and means for executing operations necessary for focussing during the predetermined direction driving, such as judgement as to whether a reverse driving is necessary, calculation of the driving amount of the photographic lens to an in-focus position.

REFERENCES:
patent: 4509841 (1985-04-01), Sakai et al.
patent: 4538892 (1985-09-01), Sakai et al.
patent: 4617459 (1986-10-01), Akashi et al.
patent: 4825239 (1989-04-01), Suda et al.
Patent Abstracts of Japan, Document No. 58-24123, 41 P 194.
Patent Abstracts of Japan, Document No. 61-165716, 103 P 526.
Patent Abstracts of Japan, Document No. 63-172231, 59 P 790.

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