Patent attributes
A light emitting end face side front end part of an optical fiber bundle 16 is covered by a sleeve member 13 and an emitting part outer cover 14. A glass rod holding member 42, which holds a glass rod 40, is mounted to emitting part outer cover 14. Glass rod 40 is fixed to glass rod holding member 42 by means of positioning pins 44 and a light incidence end face 40i thereof opposes a light emitting end face 16o of optical fiber bundle 16. A light emitting end face 40o of glass rod 40 has a rectangular shape. The light emitting from light emitting end face 40o is made uniform in illuminance across the entirety of its cross section and the cross section thereof is shaped to a rectangular shape in the process of being propagated while being totally reflected at the boundary surface of glass rod 40.
