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:
May. 25, 2004
Filed:
Feb. 10, 2003
Matthias Burkhardt, Munich, DE;
Herbert Maurizio Cardarelli, Munich, DE;
Bernhard Roellgen, Munich, DE;
Abstract
A rod-core transformer for use as a starting transformer in the cap of a high-pressure discharge lamp for a motor vehicle headlight. The rod-core transformer has at least two cores ( ) which are in the form of rods and are arranged alongside one another, and on each of which a multilayer secondary winding ( ) is wound, with the respective layers ( ) and ( ) being connected in parallel and being arranged one above the other without any offset. Furthermore the secondary windings ( ) are electrically conductively connected to one another, with their total resistance being at most 2&OHgr;. The transformer is particularly highly suitable for use as a starting transformer for high-pressure discharge lamps with a low operating voltage, for example halogen metal-vapor high-pressure discharge lamps which do not contain mercury.