发明名称 |
Zoom lens having an easily changeable range of variable focal distance |
摘要 |
A zoom lens having a lens part for focusing, a zooming part consisting of a plurality of movable lens groups to vary focal distance, and a lens part for imaging in the rear of the zoom lens. The lens part for imaging consists of a front group. A rear group and a variable magnification lens group can be mounted at and dismounted from a position between the front group and rear group. A range of variable focal distance can be easily changed by shifting a portion of lenses positioned closer to the image side of a diaphragm in order to separate further an exit pupil of the total system from an imaging plane as the variable magnification lens group is mounted.
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申请公布号 |
US4157211(A) |
申请公布日期 |
1979.06.05 |
申请号 |
US19770777852 |
申请日期 |
1977.03.15 |
申请人 |
CANON K K |
发明人 |
HIROSE, RYUSHO;TANAKA, KAZUO |
分类号 |
G02B15/10;G02B15/12;G02B15/167;G02B15/17;G02B15/20;(IPC1-7):G02B15/12;G02B15/16 |
主分类号 |
G02B15/10 |
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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