Patent ID: 6628078
Filing Date: 2003-09-30
Classification: B08B,H01J

Abstract:
A double-cylinder type dielectric barrier discharge lamp which has a double-cylinder type discharge container which seals discharge gas, such as xenon gas, in the space between a transparent outside cylindrical tube and inside cylindrical tube; an outside electrode provided in the vicinity of the outside of the outside cylindrical tube; and an inside electrode which is coaxially disposed in the bore of the inside cylindrical tube; comprising:a gas introduction tube which has an outside diameter smaller than the diameter of the bore of said inside cylindrical tube, providing a clearance between it and the bore, and is inserted into the bore; an other-end-side end-structure which seals the opening of said bore on the other end side so that gas, such as, nitrogen gas which is introduced from the opening at one end of said gas introduction tube and discharged from the opening at the other end of the gas introduction tube is turned back on the other end side to be introduced into said clearance; and a cover which covers said outside electrode, and prevents the outside electrode from being exposed to the ozone generated by the ultraviolet light radiated from said discharge container; wherein said outside electrode is formed in a trough-like shape, and is disposed with the inner surface being tightly contacted with the O.D. surface of said outside cylindrical tube, said inner surface forms a circular arc, such as a semicircle, in the plane orthogonalizing the axis of said outside cylindrical tube, and provides a mirror surface which reflects the light, said inside electrode is disposed in the clearance between said gas introduction tube and said inside cylindrical tube, being formed in a net-like shape which allows said gas to flow along the axial direction in the clearance, and said outside cylindrical tube provides a light taking-out window of said discharge container in the region corresponding to the aperture of said outside electrode.