发明名称 Lens system and optical device having the same
摘要 A lens system has a plurality of lenses, a stop, and a diffractive surface, the entire lens system moves during focusing, and the lens system satisfies the condition of beta>=0.5, where beta is a maximum photographic magnification.
申请公布号 US6992839(B2) 申请公布日期 2006.01.31
申请号 US20050087543 申请日期 2005.03.24
申请人 CANON KABUSHIKI KAISHA 发明人 HARADA AKIRA
分类号 G02B9/34;G02B13/18;G02B5/18;G02B27/42 主分类号 G02B9/34
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