| 摘要 |
An improved illuminating unit for illuminating a target portion of an object to be illuminated is provided, including: a fiber holding portion (XB) having a fiber insert hole (XB1) holding a light-emitting end portion of an optical fiber (X7A); and a lens holding portion (X6A12) located downstream of the fiber holding portion in a light traveling direction, light emitted from a light-emitting end of the optical fiber being directed to the target portion (XW) through a lens (X9) held by the lens holding portion (X6A12), wherein: the fiber insert hole comprises an equal-diameter portion (XB12) having a diameter substantially equal to a diameter of the optical fiber, and a larger-diameter portion (XB11) having a larger diameter than the equal-diameter portion and opening at one end face of the fiber holding portion, the fiber insert hole (XB1) holding the optical fiber extending through the equal-diameter portion; and the lens (X9) is abutted against the one end face of the fiber holding portion (XB) or a forward end face of a fusion-deformed portion (X7A1) of the optical fiber, the fusion-deformed portion being fitted in the larger-diameter portion(XB11) and resulting from fusion deformation of a leading end portion of the optical fiber projecting from the equal-diameter portion (XB12). |
