| 摘要 |
PURPOSE:To perform focus detection of the light image being projected to photo detectors by sampling and holding a multiplicity of analog picture element informations and processing the digital picture element informations with a central processing unit after A/D conversion. CONSTITUTION:The image of the subject 1 is projected onto a photo detecting unit 3 having multiple picture element regions through a photographing optical system 2. The illumination signals of the respective picture element regions are converted parallel to digital signals by a signal processing circuit 4, after which they are subsequently taken into a central processing unit 5, where the focus detecting signal indicating the focus matching condition is obtained. The focus detecting signal is sent to a display device 6 to inform to the photographer of the focus matching condition and perform focus control of the photographing optical system 2 through an optical element driving circuit 7 and driving device 8. Since this constitution enables many picture element informations to be digitized at a high speed, the focus detection even for the subject being a moving body may be accomplished. |
