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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
US6924949(B2)
申请公布日期
2005.08.02
申请号
US20010851937
申请日期
2001.05.10
申请人
CANON KABUSHIKI KAISHA
发明人
HARADA AKIRA
分类号
G02B13/18;G02B5/18;G02B27/42;(IPC1-7):G02B9/62
主分类号
G02B13/18
代理机构
代理人
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