Patent ID: 8358067
Filing Date: 2013-01-22
Classification: G02B

Abstract:
1. A lighting apparatus comprising: an excitation-light source; a light guiding member which guides excitation light which has launched from the excitation-light source; and a wavelength converting unit which converts a wavelength of the excitation light guided by the light guiding member to a desired wavelength, wherein the wavelength converting unit includes at least a holder and a wavelength converting member, and the holder has a through hole, and an opening on one side of the through hole is a holder incidence opening which is connected to an excitation-light emerging end of the light guiding member, and an opening on the other side of the through hole is a holder launch opening through which the wavelength-converted light is irradiated, and at least a part of an inner surface of the through hole has a reflecting portion, and the wavelength converting member has a first surface which is facing the excitation-light emerging end of the light guiding member, and a second surface which is an opposite side of the first surface, and the first surface is isolated from the excitation-light emerging end of the light guiding member, and the second surface is disposed near the holder launch opening, and an area of the second surface is smaller than an area of the holder launch opening, and a wavelength-converted light propagating area is formed, which is in continuity from the excitation-light emerging end of the light guiding member up to a second area, and which is for making the wavelength-converted light which has been reflected at least once at the reflecting portion, launch from the second area, when an area of the holder launch opening which is occupied by the second surface is let to be a first area and an area of the holder launch opening other than the first area is let to be a second area.