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Surface light source device with half-ellipse reflecting plate

  • US 7,441,916 B2
  • Filed: 02/14/2006
  • Issued: 10/28/2008
  • Est. Priority Date: 11/07/2005
  • Status: Expired due to Fees
First Claim
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1. A surface light source device, comprising a plurality of line light sources positioned immediately under a diffusion plate, and a reflecting plate for reflecting a light from each of said line light sources, wherein:

  • a cross-section perpendicular to the line light source of said reflecting plate is arranged to form at least two elliptical sections of two intersecting ellipses where the two ellipses commonly share a focal point and are divided by a straight line, the straight line includes the focal point commonly shared and two other focal points; and

    said reflecting plate at least partially encloses the line light source and reflects light from the light source toward the diffusion plate by specular reflection and by diffuse reflection.

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