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:
Mar. 03, 1998
Filed:
Dec. 21, 1995
Ikuhiro Okuno, Kyoto, JP;
Toshiyoshi Oga, Shiga, JP;
Hidehito Kawahara, Osaka, JP;
Masashi Sangen, Kyoto, JP;
Matsushita Electronics Corporation, Osaka, JP;
Abstract
This invention provides a compact, efficient and well-designed circular fluorescent lamp with high output power. The circular fluorescent lamp has less non-luminant region and good characteristics of luminous intensity distribution, and keeps high level of lamp lumen output. Circular arc tubes are disposed concentrically on the same plane. Electrodes are attached to the tube-end parts of the one side of the circular arc tubes respectively, and the other tube-end parts of non-electrode side are sealed. The circular arc tubes are joined each other near the tube-end parts of the non-electrode side with a bridge-jointed portion, so that a discharge path is formed between the electrodes inside the arc tubes. The tube outer diameter of the circular arc tubes is 14 mm, the circle outer diameter of the outer circular arc tube is 150 mm, and the circle inner diameter of the inner arc tube is 90 mm. The distance measured along the center line of the tube from the point corresponding radially to the end part of the bridge-jointed portion to the sealed tube-end part of the outer circular arc tube is 11 mm, and the distance measured along the center line of the tube from the point corresponding radially to the end part of the bridge-jointed portion to the sealed tube-end part of the inner circular arc tube is 6 mm.