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Modulated retroreflector system

  • US 4,983,021 A
  • Filed: 08/10/1988
  • Issued: 01/08/1991
  • Est. Priority Date: 08/10/1988
  • Status: Expired due to Term
First Claim
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1. A reflector system, comprisinga reflector for reflecting incident electromagnetic energy,a shutter for controlling at least one of electromagnetic energy incident on and electromagnetic energy reflected by said reflector, said shutter comprising a field effect scattering type liquid crystal shutter including plural volumes of liquid crystal material in a containment mediuma controller for controlling said shutter to control such incident or reflected electromagnetic energy, andcoding means for causing said controller to modulate such energy according to a prescribed code.

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