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
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