| 摘要 |
Provided is an endoscope that is capable of improving the ease of insertion by reducing the size of a distal end of an inserted portion, while ensuring a preferable observation field of view by improving the light distribution of illumination light. The endoscope employed has a tube-like inserted portion having a distal end; a light guide that is accommodated in the inserted portion and guides illumination light to the distal end; an illumination optical system that radiates the illumination light guided by the light guiding member and an objective optical system that collects light from a region illuminated by the illumination optical system, which are disposed at the distal end of the inserted portion, wherein an end portion of the light guide facing the plano-concave lens extends substantially parallel to an optical axis of the objective lens, and a shoulder portion of the distal end and an outer surface of the plano-concave lens located at the should portion are inclined so as to become narrower toward the tip. |
