Patent ID: 9122067
Filing Date: 2015-09-01
Classification: A61B,G02B

Abstract:
1. An endoscope comprising: a first image pickup optical system that is disposed in an insertion portion to be inserted into a lumen and for observing an observation object in a first observation direction; a second image pickup optical system that is disposed in the insertion portion and for observing an observation object in a second observation direction which is different from the first observation direction; a light guide that guides illumination light emitted from a light source to the insertion portion; an illumination optical system that is disposed in the insertion portion and includes a ring-shaped portion for illuminating the first observation direction; an incident surface that is provided to the illumination optical system, is in contact with an end surface of the light guide to receive the illumination light, and formed orthogonal to a longitudinal direction of the insertion portion; and two reflecting surfaces that are disposed at a position opposite to the incident surface, the two reflecting surfaces having inclinations in two directions with respect to a surface orthogonal to the longitudinal direction of the insertion portion, disposed so as to face each other, the two reflecting surfaces reflecting the illumination light incident from the light guide to the incident surface toward directions along tangent lines of the ring-shaped portion of the illumination optical system, to cause the illumination light incident to inside of the illumination optical system.