发明名称 |
Variable magnification viewfinder |
摘要 |
A variable magnification viewfinder so designed as to correct aberrations favorably and minimize variations of aberrations caused by varying magnification level thereof. The variable magnification viewfinder comprises an objective lens system and an eyepiece lens system, the objective lens system comprises in the order from the object side, a first negative lens unit, a second positive lens unit and a third positive lens unit, and is adapted in such a manner that magnification of the viewfinder is varied by shifting the second and third lens units along the optical axis with the first lens unit kept fixed.
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申请公布号 |
US4906078(A) |
申请公布日期 |
1990.03.06 |
申请号 |
US19880231676 |
申请日期 |
1988.08.11 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
INABATA, TATSUO;NOZAWA, TOSHIHIDE |
分类号 |
G02B13/12;G02B23/14 |
主分类号 |
G02B13/12 |
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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