ILLUMINATION TYPE KEY SHEET AND PUSH BUTTON SWITCH
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United States of America Patent
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Issued Date -
Sep 22, 2011
app pub date -
Nov 25, 2009
filing date -
Nov 26, 2008
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Abandoned
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Abstract
The present invention provides a technique that can divide and illuminate display elements juxtaposed in one key top for each use function. Areas divided by the dividing portions of the attenuation means in the projection surface of the key top can be respectively illuminated by backlights from different LEDs, so each divided area can be individually controlled and illuminated. Therefore, it is possible to realize a key sheet in which display elements juxtaposed in one key top are divided for each use function and illuminated.
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