Patent ID: 7999477

Claim:
A deuterium lamp comprising: a light-emitting portion having a cathode and an anode for generating an electric discharge, and emitting a discharge light toward a predetermined direction; a sealed container having a storing space in which said light-emitting portion is stored while being filled with a deuterium gas, said sealed container having a hollow body portion for which said light-emitting portion is stored in an internal space constituting a part of the storing space, and a hollow guide portion extending along an emitting direction of a discharge light from said hollow body portion with its internal space being directly communicated with the internal space of said hollow body portion and on whose front end a light exit window for emitting the discharge light out side is provided; an axis adjusting member extending along a predetermined center axis and at whose both ends openings are provided, said axis adjusting member being fixed to said hollow guide portion while storing at least a part of said hollow guide portion, said axis adjusting member having a reference surface giving an indication of the emitting direction of the discharge light; and a sealing layer including an adhesive material, provided between an outer periphery surface of said hollow guide portion and an inner wall surface of said axis adjusting member, said sealing layer fixing said axis adjusting member to said hollow guide portion with the center axis of said axis adjusting member being made coincident with the emitting direction of the discharge light.