High-pressure discharge lamp and method for producing the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYuriko Kaneko, Kiyoshi Takahashi, Hideaki Kiryu, Masato Yoshida
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Abstract
A high-pressure discharge lamp includes an arc tube portion enclosing a luminous material in the tube; a side tube portion substantially made of quartz glass that extends from the arc tube portion; and an electrode rod whose first end is arranged in the arc tube portion and a part of which is provided in the side tube portion. The electrode rod is substantially made of tungsten. A region containing at least one of copper oxide and copper is present in at least a part of the portion of the side tube portion in which the part of the electrode rod is positioned.
Claims12
A high-pressure discharge lamp comprising:
- an arc tube portion enclosing a luminous material in the tube;
- a side tube portion substantially made of quartz glass that extends from the arc tube portion;
- and
- an electrode rod whose first end is arranged in the arc tube portion and a part of which is provided in the side tube portion,
- wherein the electrode rod is substantially made of tungsten, and
- a region containing at least one of copper oxide and copper is present in at least a part of a portion of the side tube portion in which the part of the electrode rode is positioned, wherein the at least one of copper oxide and copper is contained in an amount of 1% weight to 30% by weight in the side tube portion in the region.
A method for producing a high-pressure discharge lamp comprising the steps of:
- (a) preparing a glass tube including an arc tube portion, a side tube portion extending from the arc tube portion, and substantially made of quartz glass;
- (b) passing an electrode rod substantially made of tungsten through a cylindrical structure containing at least one of copper oxide and copper;
- (c) inserting the electrode rod into the side tube portion such that a first end of the electrode rod is positioned in the arc tube portion;
- and
- (d) forming a region containing the at least one of copper oxide and copper in the side tube portion by heating the cylindrical structure and the side tube portion for tight attachment, wherein the cylindrical structure in the step (b) is a glass cylinder made of the at least one of copper oxide and copper Vycor glass and quartz glass.
Dependencies are inferred from the claim text.