Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
1998-04-07
2001-11-27
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
C428S336000, C428S688000, C428S698000, C428S702000
Reexamination Certificate
active
06322875
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a transparent decoration key top having a fine and high-grade aspect and a manufacturing method thereof which is used for mobile phones, mobile information terminals, remote controls used for various home electric appliances, card-remote controls and various kinds of keyboards.
BACKGROUND OF THE INVENTION
In conventional methods of decorating a key top of a push button switch with metallic luster or pearl luster tone, the following methods are known, for example, a method of molding by mixing metallic powder or pearl pigments in resin or rubber ingredients, a method of painting or screen-process-printing paints containing metallic powder or pearl pigments, a method of preparing a metallic film of aluminum chrome, or the like. on the surface of the key-top by vacuum evaporation method or sputtering method, and a method of metal plating.
However, the method of molding by mixing metallic powder or pearl pigment with resin and rubber causes a lack of uniformity in a stripped pattern or color tone by distorted dissemination of powder because of difficulty of uniform dispersion of pulverulent body. On the other hand, though the key-top which is obtained by preparing the metallic film of aluminum or chrome on the surface of a formed body by the vacuum evaporation method or the sputtering method presents a metallic luster, it is not of transparent quality with a rainbow-colored brilliance.
Also, with regards to resin key-tops put into push button switches of recently used mobile phones, mobile terminals, various kinds of home electric appliances, card remote controls and various kinds keyboards, and so on, the demand for the key-tops having a fine and high-grade aspect is becoming stronger.
SUMMARY OF THE INVENTION
The present invention solves the problems as described above and offers the transparent decoration key-top having a fine aspect with a rainbow-colored brilliance. That is to say, the present invention relates to the transparent decoration key-top , which comprises an inorganic thin film with film thickness of 2 nm~500 nm and with 70% or more, transmittance of visible rays on the surface or the reverse surface of a resin key-top which has rainbow-colored brilliance.
In this connection, the transmittance of visible rays in the present invention relates to a measured value.
According to the present invention, by preparing a specified inorganic thin film on the surface and/or the reverse surface of the resin key-top, the transparent decoration key-top with a fine and high-grade aspect, having a rainbow-colored brilliance mainly composed of red color, yellow color, blue color, purple color, etc. which have never been realized before and the manufacturing method thereof can be offered.
REFERENCES:
patent: 5527596 (1996-06-01), Kimock et al.
patent: 5594231 (1997-01-01), Pellicori et al.
Hess Bruce H.
McGlew and Tuttle , P.C.
Polymatech Co. Ltd.
Shewareged B.
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