Optical projection device

Abstract

The present disclosure is directed to projection devices that can project patterned light of different colors. In one implementation, the projection device can include a housing, within which reside multiple components. These components can include light emitting diodes (LEDs), a parabolic mirror reflector, a sinusoidal lenticular diffuser, and multiple spatial filters. The multiple LEDs can be provided in at least two distinct colors. The parabolic mirror reflector can be arranged to collimate light received from the multiple LEDs. The sinusoidal lenticular diffuser can be positioned at an output of the parabolic mirror reflector and arranged to diffuse the collimated light. The spatial filters can be arranged to diffuse the diffused and collimated light received from the sinusoidal lenticular diffuser. An imaging lens can be coupled to the housing and arranged to magnify the diffused light received from the spatial filters and display a cloud-like effect on a first surface.

1 . A projection device, comprising:
 a housing; and   a plurality of components included within the housing, the plurality of components comprising a plurality of light emitting diodes (LEDs), a parabolic mirror reflector, a sinusoidal lenticular diffuser, and a plurality of spatial filters, wherein:
 the plurality of LEDs are provided in at least two distinct colors; 
 the parabolic mirror reflector is arranged to collimate light received from the plurality of LEDs; 
 the sinusoidal lenticular diffuser positioned at an output of the parabolic mirror reflector and arranged to diffuse the collimated light received from the parabolic mirror reflector; 
 the plurality of spatial filters are arranged to diffuse the diffused and collimated light received from the sinusoidal lenticular diffuser, wherein each of the plurality of spatial filters has a first surface on which a plurality of relief structures are distributed; and 
   an imaging lens coupled to the housing, wherein the imaging lens is arranged to magnify the diffused light received from the plurality of spatial filters and display a cloud-like effect on a first surface.