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Lighting device having optical element carrying electrical contacts

Patent

US9086193

Owner

OSRAM GmbH

Filing Date

March 05, 2014

Priority Date

March 11, 2013

Portfolio

Lighting - OSRAM

Intro

Solid State Lighting (SSL) modules, such as those for street lighting, need to simultaneously meet various requirements, namely: resistance to electrical overstress (EOS), resistance to thermal dissipation, long service life and mechanical strength. This patent proposes a solution to overcome the problem that these four aspects tend to create opposing constraints.

Claims

1. A lighting device comprising: a tray-like housing having a base wall, at least one electrically powered light radiation source placed on the base w...
  1. A lighting device comprising: a tray-like housing having a base wall, at least one electrically powered light radiation source placed on the base wall of the housing with electrical contact pads in an opposite position from the base wall of the housing, a circuit board arranged on the base wall of the housing, the circuit board having a face opposite from the base wall of the housing and having electrically conductive lines extending thereon, the electrically conductive lines having respective electrical contact pads in positions facing the electrical contact pads of the at least one light radiation source, and at least one optical element having a light input to collect light radiation at said at least one light radiation source and at least one light output to project light radiation from the lighting device; the optical element having an electrically non-conductive base wall resting on the at least one light radiation source and the circuit board to urge the at least one light radiation source and the circuit board toward the base wall of the housing; the base wall of the optical element carrying electrical contacts to bridge the contact pads of the at least one light radiation source and the circuit board.
  2. The lighting device as claimed in claim 1, wherein the tray-like housing includes metal material.
  3. The lighting device as claimed in claim 1, wherein the optical element includes a body of plastic material.
  4. The lighting device as claimed in claim 1, wherein the circuit board is in the form of a printed circuit board.
  5. The lighting device as claimed in claim 1, wherein the circuit board includes anode and cathode power supply lines.
  6. The lighting device as claimed in claim 1, wherein said light radiation source has a plate-like substrate, having at least one light radiation emitter, mounted thereon.
  7. The lighting device as claimed in claim 1, wherein the circuit board is an elongate linear member.
  8. The lighting device as claimed in claim 1, wherein the circuit board has at least one cut-out with said at least one light radiation source extending in said cut-out. 
  9. The lighting device as claimed in claim 1, wherein the at least one optical element includes a reflector having a light input aperture to collect light radiation at said at least one light radiation source and at least one light output aperture to project light radiation from the lighting device.
  10. The lighting device as claimed in claim 2, wherein the tray-like housing includes aluminum.
  11. The lighting device as claimed in claim 6, wherein the plate-like substrate is a ceramic or with a metal core.
  12. The lighting device as claimed in claim 6, wherein the at least one light radiation emitter is an LED.
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Abstract

A lighting device includes a tray-like housing with a base wall, at least one light radiation source on the base wall of the housing, having electrica...
A lighting device includes a tray-like housing with a base wall, at least one light radiation source on the base wall of the housing, having electrical contact pads in an opposite position from the base wall of the housing, and a circuit board on the base wall of the housing with electrically conductive lines extending on the face of the board opposite from the base wall of the housing, with respective electrical contact pads placed in positions facing the electrical contact pads of the light radiation source. At least one optical element is provided, with a light input to collect light radiation at the light radiation source and one or more light outputs to project light radiation from the lighting device. The optical element has an electrically non-conductive base wall which urges the light radiation source or sources and the circuit board toward the base wall of the housing.
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Buggi
January 08, 2018

The Patent is about a LED Module with a kind of solder free contacts to overcome the problem of different thermal expansion and solder cracks thereof. It is proposed to place the LEDs over the conducting tracks with a holding force to ensure an electrical contact. The reliability of such a solution is not proven yet.


Aidin
January 04, 2018

The patent discloses a LED light structure having a solid-state light radiation source, such as high luminosity LEDs to tackle the problem of electrical insulation, thermal dissipation, mechanical strength and lifetime of the LEDs. Proposed are mechanically strong light structures having a base wall, light radiation source and optical elements presses against the base wall. Also disclosed a housing made of metal material having good thermal dissipation characteristics. The technology may be implemented in LED street lights, solar lights, outdoor lights, facility lights, runway lights etc.


Patent101
December 28, 2017

I think that the invention is about a reflector in a light fixture. Beside doing its regular job of reflecting, the reflector also provides a mechanical assembly function by pressing the LED and driver circuit against the base wall of the fixture.


Franz
November 27, 2017

Reliability of contacts may be a problem.


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