FOCUS STATE DETECTOR

摘要

PROBLEM TO BE SOLVED: To provide a focus state detector capable of assuring a light quantity sufficient for an imaging device for videos by splitting the incident subject light on the imaging device for videos, guiding this light to a pair of the imaging devices for detecting the focus state and detecting the focus state by determining a focus evaluation value from the video signals obtainable from a pair of the imaging devices for detecting the focus state. SOLUTION: The one-third of the incident subject light on a photographic lens 10 is branched from the subject light for videos by a half mirror 24 and is further bisected by prisms 30A and 30B. The bisected light is made incident on the respective imaging devices 32A and 32B for detecting the focus state. The focus state is detected by determining the focus evaluation values from the video signals obtainable from the imaging devices 32A and 32B for detecting the focus state. COPYRIGHT: (C)2003,JPO