OBLIQUE-VIEW OBJECTIVE OPTICAL SYSTEM AND OBLIQUE-VIEWING ENDOSCOPE EQUIPPED WITH SAME

WIPO Patent Application WO/2017/104268

A1

Provided are a compact oblique-view objective optical system with high performance, and an oblique-viewing endoscope equipped with the same. The oblique-view objective optical system comprises, in the order from an object-side, a front lens group GF having a negative refractive power, an optical path conversion element P, an aperture stop S, and a rear lens group GR having a positive refractive power. The front lens group GF comprises a first lens L1 and a second lens L2. The rear lens group GR comprises a third lens L3 and a cemented lens CL having a positive refractive power. The first lens L1 comprises a negative lens with the concave surface facing an image surface. The second lens L2 comprises a single lens with the convex surface facing the image surface, or comprises a cemented lens. The third lens L3 comprises a positive lens. The cemented lens CL comprises a positive lens L4 comprising a biconvex lens and a meniscus-shaped negative lens L5. The oblique-view objective optical system satisfies the following conditional expressions (1) through (3): 1.6 < D1 / f < 4.7 (1) 1.0 < D2 / f < 3.3 (2) 9.0 < L / f < 31.0 (3)

TAKASUGI YOSHIHARU (JP)

PCT/JP2016/081574

June 22, 2017

October 25, 2016

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OLYMPUS CORP (JP)

G02B13/04; A61B1/00; G02B23/26

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JPH10260348A	1998-09-29
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SAITO Keisuke et al. (JP)

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