Device and method for autofocus adjustment,申请号US20020278893-传众专利搜索

Device and method for autofocus adjustment

申请公布号：US7499096(B2)

申请号：US20020278893

申请日期：2002.10.24

申请公布日期：2009.03.03

分类号：G03B7/00;H04N5/232;G02B7/28;G02B7/32;G03B13/36;G03B17/12

主分类号：G03B7/00

摘要：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.