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Flat and transparent front-lighting system using microprisms

  • US 5,671,994 A
  • Filed: 06/08/1994
  • Issued: 09/30/1997
  • Est. Priority Date: 06/08/1994
  • Status: Expired due to Term
First Claim
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1. A system especially suitable for illuminating the front side of an object, as viewed by an observer, comprising:

  • (a) a light pipe assembly having opposing forward and rearward faces;

    (b) an arrangement directing light into said light pipe assembly in a predetermined way;

    (c) an arrangement of optical components forming part of said light pipe assembly reflecting substantially all of the light directed into said light pipe assembly in said predetermined way in a forward direction through the forward face of the light pipe assembly, said light pipe assembly including said arrangement of optical components being substantially transparent to visible light in a direction across the opposing forward and rearward faces of the assembly such that the light pipe assembly can be positioned between the object being illuminated and the observer without in any significant way disrupting the observer'"'"'s view of the object; and

    (d) wherein said light pipe assembly includes means for insuring that the visible light passing across the opposing faces of the light pipe assembly does so in a substantially undistorted manner, whereby the observer is able to view said object through the light pipe assembly substantially free of distortion.

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