| 摘要 |
PROBLEM TO BE SOLVED: To provide a very compact zoom lens suitable for an optical system for a solid-state imaging device whose shading characteristic is improved. SOLUTION: The zoom lens has a 1st lens group L1 having negative refractive power, a 2nd lens group L2 having positive refractive power and a 3rd lens group L3 having negative refractive power in order from an object side to an image side, and space between the respective lens groups is changed in the case of zooming. The allotment of the variable power of the 2nd lens group L2 and the 3rd lens group L3 is performed and the focal distance of the 3rd lens group L3 is set within an appropriate range. COPYRIGHT: (C)2006,JPO&NCIPI
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