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:
Aug. 21, 2012
Filed:
Jun. 02, 2010
Kazunori Ohta, Osaka, JP;
Kouhei Gamada, Osaka, JP;
Masayuki Suizu, Kyoto, JP;
Shuji Tamaru, Hyogo, JP;
Kazunori Ohta, Osaka, JP;
Kouhei Gamada, Osaka, JP;
Masayuki Suizu, Kyoto, JP;
Shuji Tamaru, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention aims to provide a small-sized high-efficiency high pressure discharge lamp that exhibits favorable light intensity distribution properties and is less likely to cause breakage of an arc tube. The present invention is a high pressure discharge lampcomprising: an arc tubethat includes; a light-emitting parthaving a substantially spherical shape and having mercury enclosed therein; and a pair of sealing partsextending from opposite sides of the light-emitting part; and a pair of electrodesthat are arranged in the arc tubesuch that an end of each electrode is sealed by a respective sealing part and the other ends of the electrodes oppose each other in the light-emitting part. The enclosed mercury has a density of 0.2 to 0.4 [mg/mm] inclusive. A distance W from a contact point S to a center O is 3.0 to 5.0 [mm] inclusive. A distance Cfrom a contact point Tto the center O is 1.5 to 3.0 [mm] inclusive. The distance Cand a distance Csatisfy a relation C/C≧0.8, and a minimum thickness X [mm] and a maximum outer diameter D [mm] satisfy a relation X/D≧0.2.