Auto focus system

Details Auto focus system Auto focus system

2003-08-18

2009-08-18

Lee, M. (Department: 2622)

Television

Camera, system and detail

Optics

C348S354000

Reexamination Certificate

active

07576796

ABSTRACT:
In the auto focus system, focus evaluation values indicating a degree of sharpness of images are sought from a plurality of image pickup devices placed at positions of different light path lengths, a travel distance converging to zero as a focus of a picture-taking lens approaches a focusing position is sought by using a difference or a ratio between the two focus evaluation values, and the focus is moved to a new moving target position which is a value of a current moving target position having the travel distance added thereto so as to securely move the focus to the focusing position by stable operation of the focus suited to characteristics of the focus evaluation values.

REFERENCES:
patent: 4414575 (1983-11-01), Yamamoto et al.
patent: 4458145 (1984-07-01), Voles
patent: 4492449 (1985-01-01), Oinoue et al.
patent: 4496832 (1985-01-01), Sakai et al.
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4527053 (1985-07-01), Kinoshita et al.
patent: 4540881 (1985-09-01), Hayashi et al.
patent: 4562345 (1985-12-01), Aoki et al.
patent: 4908645 (1990-03-01), Higashihara et al.
patent: 5146071 (1992-09-01), Ookubo et al.
patent: 5574536 (1996-11-01), Kusaka et al.
patent: 6134390 (2000-10-01), Kasuya
patent: 2002/0114015 (2002-08-01), Fujii et al.
patent: 2002/0171751 (2002-11-01), Ohkawara
patent: 31 46 387 (1981-11-01), None
patent: 691 20 455 (1991-04-01), None
patent: 0 451 865 (1996-06-01), None
patent: 62-299926 (1987-12-01), None
patent: 08-152550 (1996-06-01), None
patent: 08-160284 (1996-06-01), None
patent: 09-113794 (1997-05-01), None
patent: 2002-189164 (2002-07-01), None
patent: WO 02/099495 (2002-12-01), None
patent: WO 02/099496 (2002-12-01), None
patent: WO 02/099497 (2002-12-01), None
patent: WO 02/099498 (2002-12-01), None
French Preliminary Search Report dated Jan. 6, 2005.
Office Action for corresponding Japanese Application No. 2002-243359 dated Oct. 15, 2007 and English translation thereof.
German Office Action dated Sep. 4, 2008 for corresponding German Application No. 103 38 249.6 and English translation thereof.

Affiliated with

Also associated with

Rating

Auto focus system 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 focus system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Auto focus system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4116093