| 发明名称 |
Focusing method for zoom lens |
| 摘要 |
The disclosed zoom lens has at least three components and three components are made movable for zooming to different object distances by axially moving two of said components as a unit.
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| 申请公布号 |
US4840468(A) |
申请公布日期 |
1989.06.20 |
| 申请号 |
US19880273172 |
申请日期 |
1988.11.14 |
| 申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
TANAKA, TSUNEFUMI |
| 分类号 |
G02B15/167;G02B15/173;G02B15/22 |
主分类号 |
G02B15/167 |
| 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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