发明名称 |
Zoom objective |
摘要 |
A zoom objective comprising four lens groups of which the first three lens groups counting from the object side are movable for zooming, whereby the refractive powers and the conditions of zooming movement of the aforesaid three lens groups are properly specified so as to improve the compactness while still maintaining good correction of aberrations.
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申请公布号 |
US4515446(A) |
申请公布日期 |
1985.05.07 |
申请号 |
US19820452122 |
申请日期 |
1982.12.22 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
TAKAHASHI, SADATOSHI;TSUJI, SADAHIKO;TAJIMA, AKIRA;ASANO, TOSHIAKI;MINAMI, SETSUO |
分类号 |
G02B15/20;G02B15/173;(IPC1-7):G02B15/16 |
主分类号 |
G02B15/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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