Patent ID: 8029438
Filing Date: 2011-10-04
Classification: A61B,G02B

Abstract:
1. An endoscope comprising: an insertion portion including a distal end portion having a distal end surface provided with an irradiating surface for irradiating illumination light, adapted to be inserted into a subject; an observation optical system disposed in the insertion portion; an observation window configuring a part of an outer surface of the distal end portion, through which an observation light to be incident into the observation optical system transmits; a first hydrophilic portion that is film-formed at least on a surface of the observation window; a second hydrophilic portion that is film-formed on a distal end surface of the distal end portion including the irradiating surface, except for the observation window; a third hydrophilic portion that is film-formed on a circumferential side surface of the distal end portion; and a heat conversion portion that is disposed on the observation window and converts the illumination light irradiated thereon into heat to prevent moisture condensation on the observation window, wherein the heat conversion portion on the observation window has a roughened surface on a part of the observation window that faces an irradiating surface of a light guide that transmits the illumination light.