Automatic focusing system

Details Automatic focusing system Automatic focusing system

2007-12-10

2010-10-05

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Optics

C348S222100, C396S079000

Reexamination Certificate

active

07808543

ABSTRACT:
To provide an automatic focusing system which has an AF pickup device dedicated to an AF operation and which can perform the AF operation with high following ability to a moving subject. At the time of performing an AF control operation, a CPU of a lens unit sets a focusing state of a photographing optical system to an in-focus state by controlling a focus lens group FL of the photographing optical system so that an estimated focus value representing the magnitude of a contrast of a subject image is the maximum. The CPU adjusts an electronic shutter speed of the AF pickup device based on a brightness level of an image signal acquired by the AF pickup device and enhances the frame rate of the AF pickup device as high as possible.

REFERENCES:
patent: 5574535 (1996-11-01), Ogasawara
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patent: 7423686 (2008-09-01), Yamashita
patent: 7515820 (2009-04-01), Nakai et al.
patent: 7702230 (2010-04-01), Kijima
patent: 2004/0010652 (2004-01-01), Adams et al.
patent: 2004/0130652 (2004-07-01), Sasaki et al.
patent: 2004-212458 (2004-07-01), None

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