| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the disengagement of the position of a zoom lens or focusing lens from a cam locus by the disengagement or the like of a screw threaded shaft and a rack by impulsive vibration. SOLUTION: The optical device having optical elements 21 and 22 movable on the basis of prescribed initial positions is provided with a vibration detecting means for detecting the vibration applied on a device body and a control means for resetting the optical elements to the initial positions when the vibration detected by the vibration detecting means exceeds a prescribed level.</p> |
