Patent ID: 8106992
Filing Date: 2012-01-31
Classification: G02B,G03B,H04N

Abstract:
1. An automatic focusing system comprising: a taking optical system that forms an object image on a video imaging device of a camera main body; a first light splitting optical system that splits object light for automatic focusing, from the taking optical system; an AF imaging device that images the object image formed by the object light for automatic focusing; a focus control unit that controls focus of the taking optical system based on the object image imaged by the AF imaging device so that the taking optical system is in an in-focus state; an AF optical path through which the object light for automatic focusing split by the first light splitting optical system passes; a magnification/reduction optical system disposed in the AF optical path, the magnification/reduction optical system magnifies or reduces the object image formed on the AF imaging device; and a second light splitting optical system that further splits the object light split by the first light splitting optical system and passed through the magnification/reduction optical system, wherein a size of the video imaging device is different from that of the AF imaging device, the magnification/reduction optical system magnifies or reduces the object image formed on the AF imaging device so that the object image imaged by the video imaging device matches the object image imaged by the AF imaging device, and the AF imaging device includes a plurality of imaging devices that accept the object light split by the second light splitting optical system.