| 摘要 |
PROBLEM TO BE SOLVED: To obtain a well focused image by raising the distance measurement precision at the time of optical enlargement. SOLUTION: A microcomputer 42 is provided with a distance measurement area setting part 42a for setting a distance measurement area of an observation visual field to be imaged by a CCD 25 and a passive auto-focus control part 42a. The distance measurement area setting part 42a sets a small area (reference area) in the case of non-execution of optical enlargement and a wide angle of view and sets an area larger than the reference area in accordance with rise of the power when enlarging and outputs a high frequency signal of the distance measurement area to the auto-focus control part 52b. The auto-focus control part 42b performs focus evaluation operation in accordance with the high frequency signal of the distance measurement area outputted from a BPF part 40 and mainly performs a climbing operation of moving a first movable lens 23 toward a maximum evaluation point (maximum focus voltage). COPYRIGHT: (C)2005,JPO&NCIPI |
