Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-12-18
2008-08-19
Epps, Georgia Y. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S239000, C250S574000
Reexamination Certificate
active
07414237
ABSTRACT:
A sensor for detecting moisture on a pane includes a coupler having prisms arranged in coupling areas for coupling light from a transmitter into the pane at an input angle and prisms arranged in decoupling areas for decoupling light reflected from the pane to a receiver at a corresponding output angle. The prisms in the coupling areas have prism surfaces perpendicular to the input angle and the prisms in the decoupling areas have prism surfaces perpendicular to the output angle. Each prism includes a prism flank. The prism flanks in the decoupling areas may be arranged parallel to the output angle. Some of the prism flanks in the decoupling areas are opaque or roughened. Alternatively, some of the prism flanks in the decoupling areas are tilted from running parallel to the output angle. Alternatively, some of the prism flanks in the decoupling areas include at least one additional superimposed prism.
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Richwin Matthias
Weber Thomas
Brooks & Kushman P.C.
Epps Georgia Y.
Leopold Kostal GmbH & Co. KG
Williams Don
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