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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
US2006077569(A1)
申请公布日期
2006.04.13
申请号
US20050226329
申请日期
2005.09.15
申请人
CANON KABUSHIKI KAISHA
发明人
HARADA AKIRA
分类号
G02B9/00;G02B13/18;G02B5/18;G02B27/42
主分类号
G02B9/00
代理机构
代理人
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