| 摘要 |
PROBLEM TO BE SOLVED: To allow a moving position of a movable lens for variable magnification to be recognized without using an encoder or the like. SOLUTION: An electronic scope 10 is provided with a variable magnification drive circuit 18 and a motor 16 is driven by the drive circuit 18 to move a movable lens 14, by which an optically enlarged image is observed. A microcomputer 21, etc., in the variable magnification drive circuit 18 measures the total moving time between the driving ends of the movable lens 14 and uses the moving time from, for example, a Far end to a Near end as the variable magnification position information of the movable lens. This variable magnification position information is displayed on a monitor by meter display, etc. The approach to the ends is decided by the position information and the control, etc., to lower a driving speed are executed.
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