Key sheet
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 19, 2003
Grant Date -
Dec 13, 2001
app pub date -
Jan 31, 2001
filing date -
Mar 6, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a key sheet comprising a resin film wherein a mirror-like evaporation deposit layer is provided on a part or all of the back, and further a colored layer is provided at the back of the evaporation deposit layer, said resin film is integrated with the top face side of a button made of resin, allowing to realize a key sheet having all color metallic tones at a low cost, by making the optical concentration of the laminated portion of resin film and evaporation deposit layer 0.35 to 0.85.
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