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Radiation Emitting Device

Patent

US9537067

Owner

TU Berlin

Filing Date

May 03, 2012

Priority Date

May 03, 2012

Portfolio

Light Coupling - TU Berlin

Intro

This LED light coupler offers an improved coupling by using a sleeve between the LED and the waveguide. On the inside the sleeve is equipped with a reflective surface in the shape of a truncated cone, allowing more light to be coupled into the waveguide. Following, the coupling efficiency significantly increases.

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Claims

1. A radiation emitting device comprising: a radiation emitter that generates a radiation; a waveguide; a lens placed between the radiation emitter an...
  1. A radiation emitting device comprising: a radiation emitter that generates a radiation; a waveguide; a lens placed between the radiation emitter and the waveguide and directing a first portion of the generated radiation towards the waveguide; and a sleeve that comprises a reflective inner surface and is placed between the radiation emitter and the waveguide such that an end of the sleeve contacts an end of the waveguide, said inner reflective surface coupling a second portion of the generated radiation into the end of the waveguide, wherein the inner reflective surface of said sleeve forms a truncated cone, wherein the lens is positioned inside the truncated cone of the sleeve, wherein the sleeve has a first opening facing the waveguide and a second opening facing the radiation emitter, wherein the first opening is larger than the second opening, and wherein the diameter of a core of the waveguide is equal to the diameter of the sleeve's first opening, and wherein the lens and the sleeve are separate components that can be positioned relative to each other during fabrication of the radiation emitting device.
  2. The radiation emitting device according to claim 1, wherein the radiation emitter is disposed on a carrier.
  3. The radiation emitting device according to claim 2, wherein the carrier and the sleeve are separate components that can be positioned relative to each other during fabrication of the radiation emitting device.
  4. The radiation emitting device according to claim 1, wherein the waveguide comprises a core and a cladding.
  5. The radiation emitting device according to claim 4, wherein the diameter of the lens is smaller than the diameter of the waveguide's core.
  6. The radiation emitting device according to claim 1, wherein the lens is integrated in a carrier such that an emitting surface of the radiation emitter is positioned in the same plane as a surface of the carrier that faces the waveguide.
  7. The radiation emitting device according to claim 1, wherein the lens is shaped as a hemisphere.
  8. The radiation emitting device according to claim 7, wherein the bottom surface of the lens is positioned in the same plane as a surface of a carrier and an emitting surface of the radiation emitter.
  9. The radiation emitting device according to claim 1, wherein the waveguide is a multimode optical fiber or rod.
  10. The radiation emitting device according to claim 1, wherein the radiation emitter is a light emitting semiconductor diode.
  11. The radiation emitting device according to claim 1, wherein the sleeve consists of a metal.
  12. The radiation emitting device according to claim 2, wherein the sleeve is directly mounted on the carrier.
  13. The radiation emitting device according to claim 1, wherein the diameter of the sleeve linearly narrows from the diameter of the first opening to the diameter of the second opening.
  14. The radiation emitting device according to claim 13, wherein the slope of the sleeve ranges from about 10° to about 20° .
  15. An endoscope apparatus comprising the radiation emitting device of claim 1. 
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Abstract

An embodiment of the present invention relates to a radiation emitting device comprising: - a radiation emitter for generating radiation; - a wa...
An embodiment of the present invention relates to a radiation emitting device comprising: - a radiation emitter for generating radiation; - a waveguide; - a lens placed between the radiation emitter and the waveguide and directing a first portion of the radiation towards the waveguide; - a sleeve that comprises a reflective inner surface and is placed between the radiation emitter and the waveguide, said inner reflective surface coupling a second portion of the radiation into the waveguide; - wherein the lens and the sleeve are separate components that can be positioned relative to each other during fabrication of the radiation emitting device.
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