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Illumination device comprising a heat sink

  • US 8,157,418 B2
  • Filed: 11/04/2008
  • Issued: 04/17/2012
  • Est. Priority Date: 11/19/2007
  • Status: Active Grant
First Claim
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1. An illumination device (1) comprising at least one substrate plate (2), at least two light-emitting diodes (3) (LEDs) arranged on the same side (A) of the substrate plate (2), the LEDs (3) are each embedded into a housing (6) placed on the substrate plate in order to dissipate waste heat of the LEDs (3), and at least one electrically conductive cooling device (8) arranged on the opposite side (B) of the substrate plate (2) wherein at least two LEDs (3) are thermally operatively connected to the cooling device (8) by means of in each case at least one thermal coupling device (9) formed from an electrically conductive material,characterized in that the cooling device (8) has at least two regions (8a, 8b, 8c) which are electrically isolated from one another, wherein a first region (8b) is thermally and electrically operatively connected to at least one first LED (3), and a second region (8a, 8c) is thermally and electrically operatively connected to at least one second LED (3) andcharacterized in that at least one mechanical connecting element (13) is arranged between at least two regions (8a, 8b, 8c) of the cooling device (8) while maintaining the at least two regions electrically isolated from one another.

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