LIGHT GUIDE SHEET AND KEY SHEET USING THE SAME
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United States of America Patent
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N/A
Issued Date -
Jun 23, 2011
app pub date -
Aug 12, 2009
filing date -
Sep 5, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is provided a light guide sheet and a key sheet using said light guide sheet, said light guide provided at the rear surface side of a key top configured with a plurality of key buttons, said light guide sheet guiding light beam from a light source for lighting up said plurality of key buttons from their back surface side, comprising: a light guide portion having a plate-like shape; a periphery portion formed integrally around said light guide portion, said periphery portion whose thickness is thinner than that of said light guide portion, in which a surface facing the rear surface of said key top has a flat surface, and a side surface is a receiving surface of the light beam outputted by said light source, wherein said periphery portion maintains a distance between the rear surface of said key top and the front surface of said light guide portion in a certain distance when said flat surface of said periphery portion contacts the rear surface of said key top.
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