发明名称 Zoom lens system
摘要 Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.
申请公布号 US2005219708(A1) 申请公布日期 2005.10.06
申请号 US20050091652 申请日期 2005.03.29
申请人 发明人 SHIBAYAMA ATSUSHI;MIZUGUCHI KEIKO
分类号 G02B15/14;G02B15/173;(IPC1-7):G02B15/14 主分类号 G02B15/14
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