LED light engine

CAFC
  • US 7,832,896 B2
  • Filed: 04/18/2008
  • Issued: 11/16/2010
  • Est. Priority Date: 04/18/2008
  • Status: Active Grant
First Claim
Patent Images

1. A light engine for illuminating a target plane at a defined uniformity, the light engine spaced from the target plane a distance D and comprising:

  • a plurality of LEDs arranged in adjacent rows spaced from one another by a distance W, each of the LEDs having an off-axis angle β

    1 defined by a half intensity boundary where luminous intensity of the LED on a plane is about half the luminous intensity on the plane at the direct on-axis view, wherein tan β

    1<

    (W/2)/D; and

    a plurality of optical elements each cooperating with a respective LED to broaden the off-axis angle β

    1 to an off-axis angle β

    2 wherein the half intensity boundary of one row of LEDs is in close proximity to the half intensity boundary of the adjacent row of LEDs at the target plane.

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