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:
Sep. 02, 2003
Filed:
Sep. 06, 2001
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a short arc type mercury discharge lamp that, at lamp startup time, quickly shifts glow discharge to arc discharge, and quickly shifts the arc discharge position from the coil to the electrode tip, making it possible to maintain a stable discharge state, in the short arc type mercury discharge lamp , a coil has been arranged on the side surface of an electrode , and 0.15 mg/mm or more of mercury has been sealed inside a discharge vessel, wherein the side part of the coil close to the tip side of the electrode is constructed so as to be fixed to the side surface of the electrode , and, at least, the part of the coil following the side part is distanced from the side surface of the electrode.