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OBJECTIVE LENS FOR ENDOSCOPE, AND ENDOSCOPE USING SAME
专利权人:
OLYMPUS MEDICAL SYSTEMS CORP.
发明人:
KATAHIRA, YUKO
申请号:
EP10839206
公开号:
EP2498114A4
申请日:
2010.12.10
申请国别(地区):
EP
年份:
2012
代理人:
摘要:
Provided are an endoscope objective lens that has a simple configuration and is suitable for a compact, high-resolution image acquisition device usable in laser treatment and the like, and an endoscope using the same. Provided is an endoscope objective lens 1 including, in sequence from an object side, a front group (FG), an aperture stop (S), and a back group (BG). The front group (FG) includes, in sequence from the object side, a negative first lens (L1) whose concave surface faces an image side, a positive second lens (L2) whose convex surface faces the object side and whose flat surface or concave surface is located on the image side, and a filter (FL). The back group (BG) includes, in sequence from the object side, a positive third lens (L3) whose convex surface faces the image side, and a combined lens (E45) formed of a plano-convex lens or a biconvex lens (L4) and a negative meniscus lens (L5) and satisfies the following Conditional Expression (1) n⁢3>-ν⁢3/12+5.5 where n3 is the refractive index of the third lens (L3), and ν3 is the Abbe number of the third lens (L3).
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/
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