| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens obtaining an image angle intended by a photographer even in a simultaneous operation of zooming and focusing by correcting zoom position control and cancelling the image angle change caused by focusing. <P>SOLUTION: A lens device includes: zoom, focus, zoom position control signal generation means; focus position control signal generation means; first calculation means for calculating the present image angle (first image angle) from the zoom and focus positions; second calculation means for calculating a second image angle from a zoom control signal and the focus position; third calculation means for calculating a third image angle from the zoom and focus position control signals by calculation by the second calculation means; reference image angle determination means for making a sum of the first image angle and a value subtracting the third image angle from the second image angle be a reference image angle; and zoom position control determination means for determining the zoom position which is to be the reference image angle, and the zoom is driven to the zoom position determined by the zoom position control determination means. <P>COPYRIGHT: (C)2012,JPO&INPIT |
