| 发明名称 |
Photographic lens of the partial focusing type |
| 摘要 |
A photographic lens having four components of characteristic forms with the 1st component counting from front being axially moved forward while the 2nd component is moved axially in a given relation to the 1st component as focusing is effected down to shorter object distances.
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| 申请公布号 |
US4477155(A) |
申请公布日期 |
1984.10.16 |
| 申请号 |
US19820448807 |
申请日期 |
1982.12.10 |
| 申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
SATO, YASUHISA;YOKOTA, HIDEO;YAMADA, YASUYUKI |
| 分类号 |
G02B9/34;G02B9/60;G02B13/18;(IPC1-7):G02B9/34 |
主分类号 |
G02B9/34 |
| 代理机构 |
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代理人 |
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