Waveguide design incorporating reflective optics

Details Waveguide design incorporating reflective optics Waveguide design incorporating reflective optics

2008-04-01

2008-04-01

Healy, Brian M. (Department: 2883)

Optical waveguides

Planar optical waveguide

C385S014000, C385S031000, C385S033000, C385S130000, C385S132000, C345S176000

Reexamination Certificate

active

07352940

ABSTRACT:
This invention relates to devices for coupling light between an optical waveguide and an optical element in a manner that is substantially independent of temperature, using reflective optics. Certain embodiments of the invention concern improved designs for the transmit and receive optics of a waveguide-based optical touch screen sensor, incorporating reflective optics. The improved designs have substantially temperature independent operation and reduced optical losses. In one preferred embodiment the improved design incorporates a parabolic or quasi-parabolic reflector. In another preferred embodiment the improved design incorporates an elliptical or quasi-elliptical reflector. The transmit and receive elements and associated waveguides preferably comprise photo-patternable polymers.

REFERENCES:
patent: 5914709 (1999-06-01), Graham et al.
patent: 6181842 (2001-01-01), Francis et al.
patent: 2004/0201579 (2004-10-01), Graham
patent: 2005/0271326 (2005-12-01), Luo
patent: 2006/0001653 (2006-01-01), Smits
patent: 2006/0188196 (2006-08-01), Charters et al.

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