发明名称 |
Endoscopic objective lens |
摘要 |
Single homogeneous planoconvex lens 10 having a uniform refractive index is combined with single distributed-index lens 12 having its refractive index distributed in a radial direction and the object plane, the homogeneous planoconvex lens, the distributed-index lens and the image plane are arranged in that order along the optical axis. Both surfaces of the distributed-index lens are planar and the homogeneous planoconvex lens has its convex surface directed toward the distributed-index lens and the planar surface toward the object. Various characteristics of the two lenses are so specified as to provide an angle of view greater than 50 DEG . <IMAGE> |
申请公布号 |
EP1003059(A3) |
申请公布日期 |
2001.06.27 |
申请号 |
EP19990120805 |
申请日期 |
1999.10.21 |
申请人 |
NIPPON SHEET GLASS CO. LTD. |
发明人 |
KITTAKA, SHIGEO;SHIBAYAMA, NOBUO |
分类号 |
A61B1/00;G02B23/24;G02B23/26 |
主分类号 |
A61B1/00 |
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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