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Fresnel lens sheet and rear projection screen

  • US 20040196562A1
  • Filed: 08/29/2003
  • Published: 10/07/2004
  • Est. Priority Date: 08/30/2002
  • Status: Active Grant
First Claim
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1. A Fresnel lens sheet having a light-receiving surface on which light emitted by a light source falls, and a light-emitting surface from which the light emitted by the light source is emitted, said Fresnel lens sheet comprising:

  • a plurality of prism groups, each including a plurality of prisms, each having a totally reflecting surface that reflects incident light totally toward the light-emitting surface;

    wherein the light-receiving surface on the side of the light source is divided into a predetermined specific region and another region, and the prisms in the predetermined specific region have a height bigger than that of the prisms in another region.

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