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专利名称：OPTICAL SYSTEM, OPTICAL DEVICE
COMPRISING OPTICAL SYSTEM, ANDMETHOD FOR MANUFACTURING OPTICALSYSTEM
发明人：Masashi YAMASHITA申请号：US15544407申请日：20160121
公开号：US20180196168A1公开日：20180712
专利附图：
摘要：An optical system includes, disposed in sequence starting on an object side
along an optical axis: a first lens group having a positive refractive power; a second lensgroup having a negative refractive power; and a third lens group having a positiverefractive power, wherein: the second lens group moves along the optical axis uponfocusing from an infinity-distance object to a short-distance object; and a followingconditional expression is satisfied: 1.00
申请人：Nikon Corporation
地址：Minato-ku, Tokyo JP
国籍：JP
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