(12) United States Patent ao) Patent No.: Us 7,697,058 B2
Yamazaki (45) Date of Patent: Apr. 13,2010
(54) DEVICE AND METHOD FOR AUTOFOCUS
ADJUSTMENT BY COMBINING A
DISTANCE-MEASURING SENSOR AND
(75) Inventor: Akihisa Yamazaki, Asaka (JP)
(73) Assignee: FUJIFILM Corporation, Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 962 days.
(21) Appl.No.: 11/325,357
(22) Filed: Jan. 5, 2006
(65) Prior Publication Data
US 2006/0109369 Al May 25, 2006
Related U.S. Application Data
(62) Division of application No. 10/278,893, filed on Oct. 24, 2002, now Pat. No. 7,499,096.
(30) Foreign Application Priority Data
Oct. 26,2001 (JP) 2001-329498
(51) Int. CI.
H04N 5/232 (2006.01)
(52) U.S. CI 348/348; 348/349
(58) Field of Classification Search 348/348,
348/349, 352, 353, 354 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
6,067,114 A * 5/2000 Omataetal 348/345
6,144,763 A * 11/2000 Ito 382/166
6,704,054 Bl * 3/2004 Hashimoto 348/354
2001/0028402 Al* 10/2001 Sugimotoetal 348/345
FOREIGN PATENT DOCUMENTS
JP 61-198880 A 9/1986
The autofocus adjustment device comprises a distance-measuring sensor and a contrast system AF, and is capable of attaining further speeding up and high accuracy. The autofocus adjustment device drives a focus lens according to the measurement result of a distance-measuring sensor and then performs focus adjustment according to a contrast system according to the image signal outputted from a solid-state image pickup element, and makes variable the search range and determination area of the contrast AF according to the measured distance from the object, brightness of the object, focal length and aperture, etc. of the lens. The distance-measuring sensor measures the distance from the object periodically before a release button is depressed and speeds up the focusing when the release button is depressed. The autofocus adjustment device also detects a change of the periodically acquired distance measurement output, determines the change of the object and when it is decided that the change of the object is large, performs focus adjustment according to the contrast system, and thereby speeds up AF processing and reduces electric power consumption.
4 Claims, 10 Drawing Sheets