| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of vibration, noise and heat at the time of the changeover drive of an optical member. SOLUTION: A driving voltage V1 larger than the driving voltage V2 at the time of normal drive t2 is applied at the time of an initial operation t1 to a solenoid for moving filters F1 and F2 inserted to the optical path of an optical system to the inside or outside of the optical path and control is performed so as to return it to the voltage V2 at the time of the normal drive by a prescribed change rate.
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