| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an endoscope in which light distribution of an illumination optical system can be switched by an easy control, and light supplied from a light source is efficiently used as illumination light. <P>SOLUTION: An objective optical system 26, an illumination optical system 27a, 27b are disposed in a distal end 16a continuously prepared at an insertion part distal end of the endoscope. The illumination optical system 27a, 27b consist of an optical fiber 31a, 31b, and a liquid lens 40. The light led from a light source to the optical fiber 31a, 31b is supplied to the liquid lens 40. The Illumination optical system 27a, 27b irradiate illumination light to a surface H of a subject by the liquid lens. Electrode members 44, 45 of the liquid lens 40 are impressed by voltage, thereby an illumination angle changes and an illumination angle of the illumination optical system 27a, 27b becomes a wide angle, and a light range S<SB POS="POST">L</SB>of the illumination optical system 27a, 27b laps with an observation range S<SB POS="POST">O</SB>of the objective optical system 26. <P>COPYRIGHT: (C)2012,JPO&INPIT |
