Star field projection apparatus

Details Star field projection apparatus Star field projection apparatus

2009-08-12

2011-11-15

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Polarizer or interference filter

C353S028000, C353S122000, C434S284000, C434S285000, C362S121000

Reexamination Certificate

active

08057045

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.

REFERENCES:
patent: 4588384 (1986-05-01), Shiba
patent: 2003/0179376 (2003-09-01), Houde-Walter et al.
patent: 2005/0195456 (2005-09-01), Houde-Walter et al.

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