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Light extraction from LEDs with light pipes

  • US 6,560,038 B1
  • Filed: 12/10/2001
  • Issued: 05/06/2003
  • Est. Priority Date: 12/10/2001
  • Status: Active Grant
First Claim
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1. A non-imaging optical coupler that is a figure of revolution comprising, in combination:

  • a) a light-transmitting body defining a recessed input cavity, a transparent-droplet shaped encapsulant of a light emitting diode, or array of diodes in the cavity, b) there being a body curved side wall shaped to totally internally reflect all the light emitted from the LED and encapsulant, traveling toward said side wall, within a predetermined distance from the diode or center of said array, c) there also being a body cylindrical transition section extending from said curved side wall and forwardly, d) a planar exit face at the forward end of the body, transverse to an axis of said figure of revolution.

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