G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.5
G08B 1/08 (2006.01)
Patent
CA 1249868
ABSTRACT OF THE DISCLOSURE A touch-sensitive key has a radiation-propagating prism or plate between a radiation source and a radiation detector. Radiation is scattered from a top surface of the prism or plate so as to reach and activate the detector through a side surface when the top surface is touched. External radiation is free to enter the prism or plate and to leave through the side surface but this radiation is not capable of actuating the detector. In one embodiment the detector is spaced from the side surface so that it cannot be reached by external radiation. In an alternative embodiment external radiation is subjected to multiple reflections within the prism or plate and at each reflection part of the ratiation is transmitted through the pertaining surface to be absorbed in a substrate layer.
453778
Bergstrom Arne
Gowling Lafleur Henderson Llp
LandOfFree
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