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Selectively light transmitting panel

  • US 4,519,675 A
  • Filed: 03/29/1983
  • Issued: 05/28/1985
  • Est. Priority Date: 04/18/1982
  • Status: Expired due to Term
First Claim
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1. A generally vertically disposed window panel providing light transmissivity modulation as a function of the time of day and which selectively transmits rays of light incident at a range of angles of incidence while reflecting rays of light incident within a narrow range of angles of incidence comprising:

  • a prism array comprising a pluraity of adjacent triangular prisms;

    said prisms having one right angle, the other two angles being such as to result in the double total internal reflection of rays incident within said narrow range of angles of incidence;

    said narrow range of angles of incidence being selected from angles greater or less than 90.

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