| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens that achieves smaller thickness and higher performance with a simple configuration and which is in a low degree of difficulty in manufacturing. SOLUTION: The zoom lens includes three groups having negative, positive and positive power in order from an object side. The first group includes a negative cemented lens formed by joining together, from the object side, a first lens comprising a negative single lens and a second lens comprising a positive single lens. The second group includes, from the object side, a third lens comprising a positive single lens and a cemented lens formed by joining together a fourth lens comprising a positive single lens and a fifth lens comprising a negative signal lens, and the third group includes a sixth lens comprising a positive single lens. The zoom lens satisfies following conditional expressions (1) to (3). (1) N1d>1.55, (2) v2d<30, and (3) f21/fw>1. COPYRIGHT: (C)2011,JPO&INPIT
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