Key sheet, light blocking effect sheet, push button switch and key sheet manufacturing method
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United States of America Patent
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Sep 2, 2014
Issued Date -
N/A
app pub date -
Dec 29, 2008
filing date -
Dec 16, 2008
priority date (Note) -
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Abstract
Provided is a key sheet or a lightproof light guiding sheet guiding light efficiently through an interior of the key sheet and preventing light leakage through a periphery of key tops. On a base sheet, a transparent resin layer, and further, a lightproof dark print layer are provided as needed, with at least one of the transparent resin layer and the lightproof dark print layer being formed of a non-corrosive coating liquid. Further, a smooth surface is formed between the base sheet and the dark print layer.
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