发明名称 |
Compact zoom lens system with a high zooming ratio |
摘要 |
A compact zoom lens system with a high zooming ratio comprises a first lens group having a positive refracting power, a second lens group having a positive refracting power and a third lens group having a negative refracting power, and is a three groups-type lens system arranged to be zoomed by respectively varying the spaces on the optical axis among the respective lens groups in which optical performance is favorable through out the zooming range.
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申请公布号 |
US4773744(A) |
申请公布日期 |
1988.09.27 |
申请号 |
US19870135090 |
申请日期 |
1987.12.18 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
YAMANASHI, TAKANORI |
分类号 |
G02B15/20;G02B15/16;(IPC1-7):G02B15/14;G02B13/18 |
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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