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:
Apr. 30, 2002
Filed:
Oct. 02, 1998
John E. Troxler, Logansport, IN (US);
Federal-Mogul World Wide, Inc., Southfield, MI (US);
Abstract
An inductively driven gas discharge lamp assembly ( ) which includes an electrodeless lamp ( ), an inductive drive coil ( ), and a flux concentrator ( ) disposed about the drive coil. The drive coil ( ) is wound about the lamp ( ), which has a neon or other ionizable gas fill that provides a visible plasma discharge upon energization by the drive coil. The flux concentrator ( ) can comprise a sleeve ( ) of magnetically permeable material, such as ferrite, which confines the magnetic field generated by the drive coil ( ). The flux concentrator ( ) can include an end piece ( ) that further confines the magnetic field at one end of the drive coil and c include a core piece ( ) that extends into a central recess ( ) within the lamp ( ) to concentrate the magnetic flux at a particular region within the lamp where the plasma discharge is primarily located. Also disclosed is an automotive lamp assembly ( ) that incorporates the flux concentrator ( ) along with an d.c. to a.c. inverter circuit ( ), an r.f. shield ( ), and a heat sink ( ).