Automatic focusing apparatus of a camera for photographing movin

Details Automatic focusing apparatus of a camera for photographing movin Automatic focusing apparatus of a camera for photographing movin

1989-05-12

1991-01-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

049888560

ABSTRACT:
An automatic focusing apparatus of a camera according to the present invention includes: a focus detector which detects repeatedly focus conditions of a photographic lens and outputs successively focus signals corresponding to the focus conditions; a drive unit for driving the photographic lens for focus adjustment; a predictor for predicting an in-focus detector; a control unit for controlling the drive unit to drive the photographic lens toward the in-focus point predicted by the predictor; an auxiliary light projector for projecting auxiliary light onto an object to enable detecting operation of the focus detector; and a forbidding device for forbidding the control of drive by the control unit while the auxiliary light is projected by the auxiliary light projector.

REFERENCES:
patent: 4422739 (1983-12-01), Watanabe et al.
patent: 4575212 (1986-03-01), Kitaura et al.
patent: 4591919 (1986-05-01), Kaned et al.
patent: 4634851 (1987-01-01), Ogasawara et al.
patent: 4687915 (1987-08-01), Sakai et al.
patent: 4762986 (1988-08-01), Suda et al.
Patent Abstracts of Japan, vol. 9, No. 170, [P-373] [1983], Jul. 16, 1985. JP-A 60-46516.
Patent Abstracts of Japan, vol. 9, No. 329 [P-416] [2052], Dec. 24, 1985. JP-A 60-156029.

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