1991-12-26
1993-05-18
Adams, Russell E.
354429, G03B 1336
Patent
active
052125157
ABSTRACT:
An auto-focusing apparatus adjusts focus of a photographing lens based on the focus detection in accordance with object image signals in an overflow of a portion of the signals is within a permissible level so that a delay time in the lens drive is shortened and the operability is improved.
The auto-focusing apparatus comprises a focus detection optical system, photo-electric conversion means having a plurality of photo-sensing elements, focus detection means for calculating a defocusing amount in accordance with the object image signals from the photo-electric conversion means, drive means for driving a photographing optical system, averaging means for calculating a mean value of the object image signals of at least a portion of the photo sensing elements, and control means for calculating the defocusing amount by the focus detection means in accordance with the object image signal when the mean value calculated by the averaging means is smaller than a predetermined value even if a portion of the object image signals of the photosensing elements exceeds a proper input level of the focus detection means and driving the photographing optical system by the drive means in accordance with the calculated defocusing amount.
REFERENCES:
patent: 4903135 (1990-02-01), Ohtake et al.
patent: 5008695 (1991-04-01), Nagaoka et al.
patent: 5153630 (1992-10-01), Ogasawara
Adams Russell E.
Nikon Corporation
LandOfFree
Auto-focusing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Auto-focusing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Auto-focusing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-807340