| 摘要 |
PROBLEM TO BE SOLVED: To obtain an imaging optical system capable of varying the degree of soft focus without causing the fluctuation of an angle of view (focal distance) and a focal position when switching a normal photographing state and a soft focus state. SOLUTION: The imaging optical system 1 forms a subject image on an imaging device. A lens L2 adjacent to a diaphragm 21 is constituted of (droplet of) a liquid lens. The liquid lens can change the shape of the lens surface of the lens L2 (droplet). By thus changing the shape, the normal photographing state and the soft focus state where larger spherical aberration is caused than in the normal photographing state are switched in the imaging optical system 1. COPYRIGHT: (C)2007,JPO&INPIT
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