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Light emissive panel unit

  • US 5,863,114 A
  • Filed: 03/07/1994
  • Issued: 01/26/1999
  • Est. Priority Date: 03/09/1993
  • Status: Expired due to Term
First Claim
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1. A light emissive panel unit comprising:

  • light source means for emitting light;

    a prism plate having first and second main surfaces, the light emitted by said light source means being incident on the first main surface, a first part of the incident light being reflected by the first main surface and a second part of the incident light passing through said prism plate and being emitted from the second main surface thereof; and

    adjusting means for adjusting the relative amounts of the first and the second parts of the incident light, and thereby the amount of light emitted from the second main surface of said prism plate, as a function of a distance of a location along the second main surface of said prism plate at which the emitted light is incident on the first main surface, said adjusting means being provided on the first surface of said prism plate.

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