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:
Nov. 30, 2004
Filed:
Sep. 20, 2001
Naohisa Ikeda, Himeji, JP;
Masanori Sugihara, Himeji, JP;
Ushiodenki Kabushiki Kaisha, Tokyo, JP;
Abstract
Short-arc discharge lamp designed to minimize the phenomenon of foil floating between the metal foil located in the foil sealing area and the sealing quartz component that is in contact with the inside of the metal foil so as to prevent cracks from forming in the foil sealing area, gas leakage from the lamp, and premature breaking of the lamp. The short-arc discharge lamp includes electrodes which are located in an emission space, a metal foil electrically connected to the electrodes, a quartz tube part which surrounds the metal foil, a sealing quartz component in contact with the inside of the metal foil, and a metallic component inserted into the sealing quartz component and electrically connected to the metal foil. The foil sealing area is formed from the metal foil, the quartz tube, and the sealing quartz component, which are sealed against one another. By the sealing action of the foil sealing area, sealing of the emission space is ensured. The short-arc discharge lamp has an electrical input power rating of greater than or equal to 4 kW and an operating pressure during luminous operation of greater than or equal to 2×10 Pa, and is operated using direct current. The above-mentioned characteristics are achieved in that the length of the area of a metallic component inserted into the sealing quartz component is greater than or equal to roughly 40% of the total length of the sealing quartz component.