| 发明名称 |
Zoom lenses |
| 摘要 |
Compact, high performance low zoom ratio variable viewing angle lens systems are provided by constructing the lens systems of two lens groups separated by a variable aerial space and limiting the dimensions of the lens systems by various mathematical conditions.
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| 申请公布号 |
US4185893(A) |
申请公布日期 |
1980.01.29 |
| 申请号 |
US19780913274 |
申请日期 |
1978.06.07 |
| 申请人 |
ASAHI KOGAKU KOGYO K K |
发明人 |
ITOH, TAKAYUKI;OGAWA, RYOTA;OKUDAIRA, SADAO;TACHIHARA, SATORU |
| 分类号 |
G02B9/64;G02B13/04;G02B15/16;G02B15/177;(IPC1-7):G02B15/14 |
主分类号 |
G02B9/64 |
| 代理机构 |
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代理人 |
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| 地址 |
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