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:
Jun. 19, 2012
Filed:
Jun. 08, 2007
Yoshiki Kitahara, Osaka, JP;
Katsuhiro Ono, Osaka, JP;
Jun Sakaguchi, Osaka, JP;
Ryo Minamihata, Kyoto, JP;
Yoshiki Kitahara, Osaka, JP;
Katsuhiro Ono, Osaka, JP;
Jun Sakaguchi, Osaka, JP;
Ryo Minamihata, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention is directed to a method for manufacturing a high-pressure discharge lamp including: a spherical portion forming a light-emitting portion (); sealing portions that are connected with both ends of the spherical portion; an electrode () that is sealed to each of the sealing portions; and a metal foil () that is connected with a rear end of each electrode. A vessel provided with a cylindrical glass tube () on both ends of the spherical portion is used, a connection structure of the metal foil and the electrode are disposed in the glass tube such that a front end of the electrode is positioned in the spherical portion, and the glass tube is melted by heat and shrunk for sealing the metal foil and the electrode so as to form the sealing portion. An inner diameter φ of the glass tube before the heat-melt processing and a distance L from an edge of the metal foil to the internal space of the spherical portion are set to satisfy a relationship of L/φ≧1.35, a corner of an edge portion of the metal foil on a side of the connection with the electrode is cut so as to form a wedge shape (), and subsequently the sealing step is performed. Thereby, it can suppress the generation of the breakage during the lighting life span, which is caused by a gap generated from the metal foil to an axis of the electrode during the sealing processing of the high-pressure discharge lamp having a high brightness property.