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Illumination device

  • US 7,052,168 B2
  • Filed: 12/17/2003
  • Issued: 05/30/2006
  • Est. Priority Date: 12/17/2003
  • Status: Expired due to Fees
First Claim
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1. A light guide, comprising:

  • a light input area through which light is introduced into the light guide; and

    first and second opposing surfaces between which light introduced into the light guide propagates, wherein a portion of the light guide near the light input area has extraction structures configured and arranged to extract more light out of the light guide when light is propagating in the light guide in a direction toward the light input area than when light is propagating in the light guide in a direction away from the light input area, and further comprising additional structures disposed on at least one of the first and second opposing surfaces, the additional structures being configured and arranged to control the angular direction of light extracted from the light guide in a direction that is substantially orthogonal to a principal axis of the extraction structures.

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