Illuminators using reflective optics with recycling and...

Details Illuminators using reflective optics with recycling and... Illuminators using reflective optics with recycling and...

2007-06-26

2007-06-26

Perkey, W. B. (Department: 2851)

Optics: image projectors

Plural

C353S097000, C353S099000, C385S146000, C362S231000, C362S026000, C362S555000, C359S490020, C359S634000

Reexamination Certificate

active

11104220

ABSTRACT:
Various optical techniques are described for obtaining a specified light output from an LED source. One technique uses a parabolic reflector surrounding an LED or LED array to create a collimated beam, and the light exit opening of the parabolic reflector is defined by a reflective disc with an opening of the desired size. Any generated light that is outside of the opening is reflected back into the parabolic reflector and re-reflected until the light exits the opening. For mixing different light colors from different LEDs or energized phosphors, a mixing tunnel is used. The mixing tunnel includes angled dichroic mirrors or angled polarizer mirrors that selectively reflect and pass selected colors or polarizations of light to a single output port of the mixing tunnel. Efficient and compact ways to energize phosphors are also described. Other optical techniques are also described.

REFERENCES:
patent: 5146248 (1992-09-01), Duwaer et al.
patent: 6869206 (2005-03-01), Zimmerman et al.
patent: 7040767 (2006-05-01), Lee et al.
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patent: 7059731 (2006-06-01), Lee et al.
patent: 7070300 (2006-07-01), Harbers et al.
patent: 2006/0139580 (2006-06-01), Conner

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