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专利名称：ENDOSCOPE OBJECTIVE OPTICAL SYSTEM发明人：USHIO, Yasuaki申请号：EP158358.8申请日：20150813公开号：EP3187916A4公开日：20180530
摘要：An object of the present invention is to reduce the diameter, to make focusadjustment easy, and to achieve bright, wide-angle, high-resolution image quality.Provided is an endoscope objective optical system (1) including, in this order from theobject side, a front group (G1) having negative refractive power, an aperture stop (S), anda positive rear group (G2). The front group includes, in this order from the object side, afirst lens (L1), which is a single lens having negative refractive power, and a second lens(L2), which is a single lens having positive refractive power. The rear group (G2) includes athird lens (L3), which is a single lens having positive refractive power, a cemented lens(CL1) formed of a fourth lens (L4) having positive refractive power and a fifth lens (L5)having negative refractive power, and a sixth lens (L6) having positive refractive power.The object-side surface of the first lens is a flat surface, the second lens has as meniscusshape, and the sixth lens is joined to the image-acquisition element, and the endoscopeobjective optical system satisfies the following conditional expression: 4 < Fno × F 6 / F 1_ 5 < 500 where Fno is the effective F number of the endoscope objective optical system,F6 is the focal length of the sixth lens, and F1_5 is the composite focal length of the firstto fifth lenses.
申请人：Olympus Corporation
地址：2951 Ishikawa-machi Hachioji-shi Tokyo 192-8507 JP
国籍：JP
代理机构：Schicker, Silvia
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