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:
Feb. 02, 2010
Filed:
Dec. 04, 2003
Jens Pollmann-retsch, Aachen, DE;
Holger Mönch, Vaals, NL;
Wouter Jozef Maes, Zwijndrecht, BE;
Edmond Mariette Emile Verstraeten, Geel, BE;
Jens Pollmann-Retsch, Aachen, DE;
Holger Mönch, Vaals, NL;
Wouter Jozef Maes, Zwijndrecht, BE;
Edmond Mariette Emile Verstraeten, Geel, BE;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Abstract
A lighting unit is described which has a discharge lamp (), in particular a high pressure or high intensity discharge (HID) lamp or an ultra high performance (UHP) lamp, a lamp driver () and a cooling device (). To reduce mechanical stresses caused by temperature variations in the lamp (), one or more operating parameters of the lamp () are detected. In addition, a control unit is provided for controlling the lamp driver () and/or the cooling device () at least during switching on and/or off of the lighting unit in such a way that there is no excursion from a predetermined range of the at least one operating parameter. By selecting the parameter range suitably, the service life of the lamp may be extended considerably or the power of the lamp may be increased while the service life remains the same.