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Illuminating lens designed by extrinsic differential geometry

  • US 6,273,596 B1
  • Filed: 05/20/1999
  • Issued: 08/14/2001
  • Est. Priority Date: 09/23/1997
  • Status: Expired due to Fees
First Claim
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1. First and second virtual grids each defining illumination cells having areas to pass light from a source, for use in mathematical generation of a lens shape, comprisinga) said virtual grids being spaced apart along an axis, both grids being dome shaped to bulge in the same generally axial direction, each grid defined by first lines and second lines that intersect said first lines, b) each cell having four edges defined by successive of said first lines and successive of said second lines, each cell having four corners, each corner defined by an intersection of a first said line and a second said line, c) the respective cells of the first grid having light flux passing one to one correspondence with the respective cells of the second grid all cells of at least one grid having substantially equal areas.

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