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LIGHT VALVE WITH FLOWING FLUID SUSPENSION

  • US 3,708,219 A
  • Filed: 08/24/1971
  • Issued: 01/02/1973
  • Est. Priority Date: 08/24/1971
  • Status: Expired due to Term
First Claim
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1. A light valve including a cell for containing a fluid suspension of minute particles dispersed therein capable of having their orientation changed by an electric or magnetic field to change the transmission of light through the suspension, said cell having front and rear wall sections spaced apart a distance which is small compared to the lateral dimensions of the sections, and means for applying an electric or magnetic field to the suspension between said wall sections to change the light transmission thereof, in which the improvement comprises circulating means connected to said cell at spaced points thereof for producing a flow of said fluid suspension through said cell during operation thereof, and means for producing a smooth generally laminar flow of said fluid suspension between said wall sections.

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