| 摘要 |
PROBLEM TO BE SOLVED: To provide a bending zoom lens, suitable for an optical device having a limited space for placing a zoom lens, small-sized and simple, and having superior image forming performance, and to provide an optical device having the zoom lens. SOLUTION: The zoom lens is made up of, sequentially starting from the object side along an optical axis, a first lens group G1 having an optical path bending optical element and having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G4 having positive refractive power. When the focal length is varied from a wide-angle end state W to a tele-end state T, the first lens group G1 and the third lens group G3 are fixed relative to an image surface I, and the space between the first lens group G1 and the second lens group G2 is increased, the space between the second lens group G2 and the third lens group G3 is decreased and the space between the third lens group G3 and the fourth lens group G4 is decreased. The first lens group G1 includes a negative lens L11, and the zoom lens satisfies predetermined conditions. COPYRIGHT: (C)2008,JPO&INPIT
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