Star field projection apparatus

  • US 7,641,345 B2
  • Filed: 03/23/2007
  • Issued: 01/05/2010
  • Est. Priority Date: 06/21/2006
  • Status: Active Grant
First Claim
Patent Images

1. A projection apparatus for generating a moving star field and a moving cloud-like effect, comprising:

  • a. an arrangement configured to generate a moving cloud-like effect using at least one non-coherent light source, the arrangement comprising at least one pair of condenser lenses, an interferential filter wheel and a motor for rotating the interferential filter wheel, the interferential wheel being disposed between the at least one pair of condenser lenses;

    b. an arrangement configured to generate a moving star field using at least one coherent light source; and

    c. a powder supply.

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