发明名称 |
Objective for video disks |
摘要 |
An objective for video disks comprising a first, second and third lenses in which the first lens is a positive lens, the second lens is a negative lens and the third lens is a positive meniscus lens having a concave surface on the video disk side. This objective is small, light in the weight and has a large N.A.
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申请公布号 |
US4416519(A) |
申请公布日期 |
1983.11.22 |
申请号 |
US19810294826 |
申请日期 |
1981.08.21 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
KOBAYASHI, YUKO |
分类号 |
G02B13/00;G02B9/12;G02B9/14;G02B13/24;(IPC1-7):G02B9/14;G02B21/02 |
主分类号 |
G02B13/00 |
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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