Patent ID: 6570301
Filing Date: 2003-05-27
Classification: H01J

Abstract:
A dielectric-barrier discharge lamp device comprising a dielectric-barrier discharge lamp having a hollow-cylinder-shaped discharge space formed between an outer tube that is roughly cylindrical in external shape and a co-axial inner tube; wherein the inner tube has a cylindrical tube extension that extends outward from the discharge space; and wherein an outer periphery of an end of the tube extension is held tightly by coupler fitting which is connected to a guide tube through which a coolant fluid flows; wherein said coupler fitting comprises a metal body, elastomeric O-rings, metal ferrules and metal cap nuts; wherein end portions of the tube extension and the guide tube are recieved in said metal body; wherein each of the metal ferrules is seated in a respective one of the cap nuts and each of the cap nuts is connected to a respective one of the tube extension and the guide tube in an axially adjustable manner; wherein each of the O-rings is mounted about a respective one of the tube extension and the guide tube within a respective end portion of the metal body is compressed into firm engagement with the respective one of the tube extension and the guide tube between a respective ferrule and the respective end portion of the metal body; and wherein a distance exists between the coupler fitting and the end of the discharge space between said tubes which is at least 0.2 mm/W, where W is the input power of the dielectric-barrier discharge lamp.