发明名称 |
Zoom lens system of inner focus type |
摘要 |
A zoom lens system of inner focus type including a first lens group having positive refractive power, a second lens group having positive refractive power and a third lens group having negative refractive power. The zoom lens system is so designed as to perform focusing by shifting the second or third lens group for a short distance along the optical axis and to minimize variation of aberrations caused due to focusing.
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申请公布号 |
US5002373(A) |
申请公布日期 |
1991.03.26 |
申请号 |
US19890307929 |
申请日期 |
1989.02.09 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
YAMANASHI, TAKANORI |
分类号 |
G02B15/20;G02B15/167;G02B15/22 |
主分类号 |
G02B15/20 |
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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