ENDOSCOPE OBJECTIVE LENS UNIT AND ENDOSCOPE

专利名称：ENDOSCOPE OBJECTIVE LENS UNIT AND

ENDOSCOPE

发明人：SASAMOTO Tsutomu申请号：EP11783439.0申请日：20110512公开号：EP2551710A1公开日：20130130

专利附图：

摘要：An endoscope objective lens unit 1 includes a front lens group FL and a rearlens group RL with an aperture stop STO interposed therebetween. The front lens groupFL includes a first lens L1 having a negative refractive power and a second lens L2 having a

positive refractive power, and the rear lens group FL includes a third lens L4 having apositive refractive power, and a fourth lens L5 having a positive refractive power and afifth lens L6 having a negative refractive power, the fourth lens and the fifth lens beingcemented to each other. The endoscope objective lens unit satisfies following

expressions (1) to (4): (1) -6 < SF < 0; (2) -3 < Fr/Ff < -1.1; (3) -1.6 < Ff/f < -0.6; and (4) Ff/fl< 1.6, where SF is a shape factor, in which R1 is an object-side radius of curvature of thesecond lens L2 and R2 is an image-side radius of curvature of the second lens L2, Ff is afocal length of the front lens group FL, Fr is a focal length of the rear lens group RL, f is afocal length of the entire unit, and fl is a focal length of the first lens L1.

申请人：Olympus Medical Systems Corp.

地址：43-2, Hatagaya 2-chome Shibuya-ku Tokyo 151-0072 JP

国籍：JP

代理机构：Schicker, Silvia

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