|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||250/201.8 ; 396/080 ; 396/104 ; 396/128|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 16 인용 특허 : 7|
Where a person is being photographed, for example, both light from the person located at closer range and light from the background located farther away enter the photodetector elements. Where the contrast of the background is high, the rate at which the information from the background contributes to the focus detection becomes larger, which hinders accurate focus detection with regard to the person. In this case, the focus detection device divides a predetermined focus area into smaller areas and detects focus condition in each smaller area.
[ What is claimed is:] [1.] A focus detection device, including an optical system which forms first and second images, and a sensor having photodetector elements which detect said first and second images, for detecting a focus condition of an objective lens based on a relative position between said first and second images, said device comprising:a first focus detector which divides said first image into plural areas and detects a first relative distance between said first and second images;a second focus detector which divides one of said areas into smal...