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. 02, 1997
Filed:
Dec. 21, 1995
Petrus H Antonis, Eindhoven, NL;
Klaas Vegter, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An electrodeless low-pressure discharge lamp (10) according to the invention is provided with a radiation-transmitting discharge vessel (11) which encloses a discharge space (14) containing an ionizable filling in a gastight manner. The lamp (10) is in addition provided with a first and a second winding (20, 23) for conducting a high-frequency current during operation. The first winding (20) extends along a longitudinal axis (29) in a cavity (28) surrounded by the discharge vessel (11). The second winding (23) is arranged along the longitudinal axis (29) in the extended direction of the first winding (20) outside the cavity (18) surrounded by the discharge vessel (11). During operation, the currents in the first and second windings (20, 23) have the same tangential direction relative to the longitudinal axis (29). The lamp causes comparatively little magnetic interference, while it is avoided that the second winding (23) hampers lamp ignition or causes an unstable lamp operation.