| 发明名称 |
Conversion type varifocal lens system |
| 摘要 |
A conversion type varifocal lens system comprising a master lens which has a front assembly of positive power and a rear assembly of negative power, and a supplementary lens upon insertion into, or removal from, the space between the front and rear assemblies to change the focal length of the entire system.
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| 申请公布号 |
US4596447(A) |
申请公布日期 |
1986.06.24 |
| 申请号 |
US19850715590 |
申请日期 |
1985.03.25 |
| 申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
YAMADA, YASUYUKI;SATO, YASUHISA;YOKOTA, HIDEO |
| 分类号 |
G02B13/02;G02B13/18;G02B15/02;G02B15/12;(IPC1-7):G02B9/34 |
主分类号 |
G02B13/02 |
| 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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