ENDOSCOPE, CAP FOR ENDOSCOPE AND ENDOSCOPE DEVICE

摘要

An endoscope according to the present invention includes: a first illumination optical system configured to emit illuminating light in a first linear polarization direction to an object from a distal end face of an insertion portion; and a first objective optical system configured to allow return light from the object illuminated by the illuminating light to enter through the distal end face; wherein the first illumination optical system and the first objective optical system are placed in a positional relationship such that on the distal end face, a line segment connecting an optical axis of the first illumination optical system and an optical axis of the first objective optical system is parallel or perpendicular to a polarization direction which results when the illuminating light emitted from the first illumination optical system is projected to the distal end face.