The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2013
Filed:
Aug. 19, 2010
Applicants:
Takuya Tsukamoto, Hyogo, JP;
Takashi Yamashita, Hyogo, JP;
Hirohisa Iwabayashi, Hyogo, JP;
Inventors:
Assignee:
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 61/073 (2006.01);
U.S. Cl.
CPC ...
Abstract
A high pressure discharge lamp comprises a pair of electrodes that face each other in an electric discharge container, wherein an electrode axis of each electrode is buried in a sealing portion, each electrode axis is joined to a metallic foil, two or more grooves are formed in an axis direction on a portion of the electrode axis, which corresponds to the sealing portion, an upper shoulder portion of each groove is formed in a shape of a curved surface, a diameter of the electrode axis is 0.3 mm to 1 mm, and a curvature radius of the curved surface upper shoulder portion is 5 μm-50 μm.