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:
Oct. 09, 2012
Filed:
Jul. 07, 2010
Applicants:
Shunichi Morimoto, Hyogo, JP;
Tetsuya Kitagawa, Hyogo, JP;
Akiko Uchino, Hyogo, JP;
Tomoyoshi Arimoto, Hyogo, JP;
Inventors:
Shunichi Morimoto, Hyogo, JP;
Tetsuya Kitagawa, Hyogo, JP;
Akiko Uchino, Hyogo, JP;
Tomoyoshi Arimoto, Hyogo, JP;
Assignee:
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 61/30 (2006.01); H01J 17/24 (2012.01);
U.S. Cl.
CPC ...
Abstract
A xenon short arc lamp for a digital projector, includes an anode, a cathode having a cathode main body that is made of tungsten containing electron emissive material, and an arc tube made of silica glass, wherein a supply source of carbon is formed on a metal portion in the arc tube except a tip area of the cathode, and the carbon is supplied to the tip of the cathode through a gaseous phase during lamp lighting, so that a surface layer of the cathode is melt.