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Illumination system using a broadband cholesteric polarizer having its surface of maximum helix pitch face the radiation source

  • US 5,737,044 A
  • Filed: 07/12/1995
  • Issued: 04/07/1998
  • Est. Priority Date: 07/12/1994
  • Status: Expired due to Fees
First Claim
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1. An illumination system comprising a radiation source and a broadband, cholesteric polarizer with a layer of a polymeric material having a cholesteric ordering, said material being ordered such that the axis of the molecular helix is oriented transversely to the layer, and the pitch of the molecular helix increasing from a minimum value at a first surface of the cholesteric layer to a maximum value at the second surface of the layer, and the polarizer being positioned in the illumination system in such a manner that the cholesteric layer faces the radiation source with the second surface.

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