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:
Dec. 12, 1989
Filed:
Dec. 01, 1987
Yoshitomi Dobashi, Fujisawa, JP;
Akihiro Inoue, Chigasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A gas discharge lamp has a discharge gas sealed in a light-transmissive, cylindrical tube in which an internal electrode is provided as a first receiving end. An external electrode having predetermined widths along the axis of the tube is provided on the outer surface of the tube as a second receiving end. A shielding film is also provided on the outer surface of the tube excluding where a slit with a predetermined width is formed. The widths of the external electrode can be changed in accordance with the luminance distribution of the gas discharge lamp. The internal and external electrodes are connected to a high frequency power source and are applied with high frequency power therefrom, thereby causing discharge within the tube.