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:
Jun. 07, 2011
Filed:
Nov. 03, 2008
Robert Kraus, Regensburg, DE;
Steffen Straub, Regensburg, DE;
Robert Kraus, Regensburg, DE;
Steffen Straub, Regensburg, DE;
OSRAM Gesellschaft mit beschränkter Haftung, München, DE;
Abstract
The invention relates to an illumination device () comprising at least one preferably ceramic substrate plate (), at least one luminous element () arranged on a front side (A) of the substrate plate () in particular at least one light emitting diode (LED) (), and at least one preferably metallic heat sink () connected, in particular adhesively bonded and/or soldered, to a rear side (B) of the substrate plate () over a large area, wherein the coefficients of thermal expansion of substrate plate () and heat sink () differ at least by the factor 1.5, in particular by a factor greater than 2. The heat sink () has at least one preferably linear recess () on its side facing the rear side (B) of the substrate plate ().