Automatic focus adjusting device with distance measuring...

Details Automatic focus adjusting device with distance measuring... Automatic focus adjusting device with distance measuring...

2005-02-01

2005-02-01

Ho, Tuan (Department: 2612)

Television

Camera, system and detail

Optics

C348S354000

Reexamination Certificate

active

06850280

ABSTRACT:
An automatic focus adjusting device in which a distance measuring area is set from a plurality of distance measuring areas including a first distance measuring area and a second distance measuring area which differs in size from the first distance measuring area. A state of focus is discriminated in a distance measuring area before a focus adjusting operation is started by driving an optical element for focus adjustment when the optical element is in an in-focus state, and on the basis of the discrimination, a distance measuring area to be used after the focus adjusting operation is started is selected from the first distance area and the second distance area.

REFERENCES:
patent: 5128768 (1992-07-01), Suda et al.
patent: 5619264 (1997-04-01), Yoshimura et al.
patent: 5629735 (1997-05-01), Kaneda et al.

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