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Spread illuminating apparatus having light controlling means

  • US 7,066,634 B2
  • Filed: 03/01/2004
  • Issued: 06/27/2006
  • Est. Priority Date: 03/27/2003
  • Status: Expired due to Fees
First Claim
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1. A spread illuminating apparatus comprising:

  • at least one light source;

    a light conductive plate that permits introduction of light emitted from the light source thereinto, and which allows the light introduced thereinto to exit out from a light exit surface thereof toward an object to be illuminated; and

    a light controlling means disposed between the at least one light source and the light conductive plate, the light controlling means having a refractive index profile formed in a direction parallel to the light exit surface of the light conductive plate.

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