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US 6,607,812 B2Granted
Key sheet
AssigneePolymatech Co., Ltd.
InventorsMasaya Katori, Masayuki Kashino
Life of this patent
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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.
Claims7
A key sheet comprising:
- a resin film, said resin film being transparent;
- an evaporation deposit layer having a metallic gloss, said evaporation deposit layer being provided on a part or the whole area of a back side of the resin film;
- a colored layer provided on a back side of the evaporation deposit layer;
- and
- a button made of resin, said button having a top face side integrated with the resin film,
- wherein a laminated portion of the resin film and the evaporation deposit layer has an optical density of 0.35 to 0.85.
3 more elements
Dependencies are inferred from the claim text.