Patent ID: 6692433
Filing Date: 2004-02-17
Classification: G02B

Abstract:
A light source device for an endoscope provided with a light guide through which illumination light passes, said light source device comprising:a light source that radiates said illumination light, which is led to an end portion of said light guide; an aperture mechanism that is disposed between said light source and said end portion, said aperture mechanism being movable and having a guide portion with which an engaging pin is engaged; a moving mechanism that moves at least one of said aperture mechanism and said engaging pin, so that said aperture mechanism is open or closed to adjust the amount of said illumination light led to said end portion; and an urging member that always urges said aperture mechanism in a direction in which said aperture mechanism is opened or closed; wherein said aperture mechanism comprises a pair of aperture members movable apart and together in opening and closing directions, respectively, to sandwich an optical path through which said illumination light passes; and wherein said guide portions of said pair of aperture members comprise guide slots overlapping each other, each said guide slot extending in a longitudinal direction along a respective said aperture member, each said longitudinal direction substantially transverse to the opening and closing directions, said engaging pin is inserted in the overlapped portion of said guide slots, and said urging member always causes said engaging pin to engage said guide slots.