Patent ID: 8803408
Filing Date: 2014-08-12
Classification: H01J

Abstract:
1. A light-emitting device, comprising: a high-pressure discharge lamp having a light-emitting portion having therein a pair of main electrodes opposed to each other and elongated sealing portions extending outward from the light-emitting portion; a bowl-shaped reflector having an insertion hole which is formed in a bottom portion and in which one of the sealing portions and a current-carrying wire for an auxiliary lamp are inserted, an inner space in which the high-pressure discharge lamp is accommodated with the one sealing portion inserted in the insertion hole and a reflection surface which is formed on an inner surface of the reflector and which reflects light from the high-pressure discharge lamp; an auxiliary lamp having an elongated ultraviolet ray emitting space in which ultraviolet rays are generated; the current-carrying wire which is connected to an external lead rod protruding from the other sealing portion opposite to the sealing portion inserted in the insertion hole, and which is wound around an outer surface of a discharge container of the auxiliary lamp to form an external electrode; and a base attached over an outer surface of the bottom portion of the reflector and having formed therein an accommodation space in which the auxiliary lamp is accommodated between the bottom portion and the base, wherein: a thickness of the bottom portion of the reflector in which the insertion hole is formed is set such that an outer end portion of the sealing portion inserted in the insertion hole projects through the insertion hole into the accommodation space of the base, and such that the entire elongated ultraviolet ray emitting space of the auxiliary lamp is located along an elongated side surface of the sealing portion, faces the sealing portion, and is accommodated in the accommodation space; the base is a bowl-shaped member including a main body portion in which the accommodation space is formed and which is attached to a surface of the bottom portion of the reflector, and a cover portion which extends from the main body portion so as to cover the bottom portion of the reflector with a second gap from an outer surface of the reflector and whose front end portion is attached to the outer surface; and when the base is attached to the bottom portion of the reflector, a center of the light-emitting portion of the high-pressure discharge lamp accommodated in the reflector is positioned on an opening face, of the base, which is defined by a periphery of the second gap on the front end portion side, or is positioned inwardly from the opening face.