| 摘要 |
PROBLEM TO BE SOLVED: To obtain a zoom optical system configured such that an image surface is fixed by zooming, and aberration fluctuation in zooming is reduced, and which has high optical performance all over the zoom range and whose optical entire length is shortened. SOLUTION: In the zoom optical system configured by arranging a plurality of optical groups whose optical power is varied, one or more optical groups and a diaphragm in an optical axis direction and performing zooming by changing the power of the plurality of optical groups whose optical power is varied, the plurality of optical groups whose optical power is varied have a plurality of optical elements Ld respectively including rotationally asymmetric surfaces, moving in a direction different from an optical axis and changing the power in the optical group, and the one or more optical groups include an optical group where an optical element having positive refractive power and an optical element having negative refractive power are arranged from the diaphragm to an image side in order and which is immobile for zooming. COPYRIGHT: (C)2007,JPO&INPIT
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