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. 23, 2004
Filed:
Feb. 19, 2003
Jochen Murr, Bornheim, DE;
Klaus Wammes, Bechtheim, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A substantially U-shaped gas discharge lamp ( ′), containing mercury for the gas discharge, is connected to a high-frequency driver circuit ( ′). To ensure that the gas discharge lamp operates with minimum loss and maximum light yield, the respective output terminals ( ′) of the high-frequency driver circuit are not electrically grounded and the central section ( ′) of the gas discharge lamp is capacitively coupled to an electric ground. A substantial reduction of lamp current in the central section is ensured, thus lowering thermal production in the central section of the gas discharge lamp. Accordingly, the central section becomes the coldest place in the gas discharge chamber and the place where condensation of the mercury occurs. The mercury vapor pressure can thus be regulated and the light yield optimized.