Star Field Projection Apparatus
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United States of America Patent
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Issued Date -
Dec 27, 2007
app pub date -
Mar 29, 2007
filing date -
Jun 21, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A projection apparatus for generating a moving star field and a cloud-like effect comprises a means for generating a cloud-like effect using at least one non-coherent light source, a means for generating a moving star field using at least one coherent light source and a means for regulating and supplying electric power. The means for generating cloud-like effect using at least one non-coherent light source comprises at least one pair of condenser lenses and an interferential filter wheel rotated by a motor, disposed between at least one pair of condenser lenses. The means for generating the moving star field using a coherent light source comprises a grating wheel rotated by a motor and a diffractive optical element disposed between the at least one coherent light source and the grating wheel.
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