Alasaarela

Ilkka A. Alasaarela, Oulu FI

Patent application number	Description	Published
20100284201	Illuminator using non-uniform light sources - An optical system comprises at least a source module comprising a non-uniform extended source (e.g., RGB-LED), an optical engine, and at least one of a lightpipe and a lenslet array arrangement. The optical engine is by example detailed at co-owned WO 2008/017718, and has a first toroidal ray guide and a second ray guide defining a common axis of revolution and having complementary imaging surfaces and pupils. For the case in which the system includes the lightpipe, such a lightpipe is disposed between the source module and the optical engine. For the case in which the system includes the lenslet array arrangement, the optical engine is disposed between the source module and the lenslet array arrangement. At least one ray guiding component, also detailed at WO 2008/017718, can be an alternative to the above optical engine. The lenslet array arrangement may include first and second lenslet arrays having corresponding lenslets.	11-11-2010

Patent application number	Description	Published
20100232176	Illuminator method and device - A first toroidal ray guide defines an axis of revolution and has a toroidal entrance pupil adapted to image light incident on the entrance pupil at an angle to the axis of revolution between 40 and 140 degrees, and it also has a first imaging surface opposite the entrance pupil. A second toroidal ray guide also defines the same axis of revolution and has a second imaging surface adjacent to the first imaging surface. Various additions and further qualities of the ray guides, which form optical channels, are disclosed. In a method light emanating from a source at between 40-140 degrees from an optical axis is received at an entrance pupil of a ray guide arrangement that is circularly symmetric about the optical axis. Then the received light is redirected through the ray guide arrangement to an exit pupil in an average direction substantially parallel to the optical axis.	09-16-2010

Patent application number	Description	Published
20090190101	Double-Reverse Total-Internal-Reflection-Prism Optical Engine - A device for a light projection system comprises at least one light source; light collection and relay optics; a reflective surface; a micro-display; an illumination total internal reflection TIR-prism disposed between the reflective surface and the micro-display; an imaging TIR-prism disposed between the illumination TIR-prism and the micro-display; and a projection lens. The light collection and relay optics is arranged to channel light emitted by the at least one light source to the illumination TIR-prism. The TIR-prism is arranged to totally internally reflect the light to the reflective surface. The reflective surface is arranged to reflect the light back through the illumination TIR-prism and through the imaging TIR-prism to the micro-display. The micro-display is arranged to reflect the light back through the imaging TIR-prism. The imaging TIR-prism is arranged to totally internally reflect the light from the micro-display to the projection lens.	07-30-2009