Plastic and nonmetallic article shaping or treating: processes – Laser ablative shaping or piercing
Reexamination Certificate
1999-06-04
2001-01-30
Silbaugh, Jan H. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Laser ablative shaping or piercing
C264S132000, C264S139000, C264S255000
Reexamination Certificate
active
06180048
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a manufacturing method of a color keypad for a contact element of a character illumination rubber switch in a mobile communication systems and electrical equipment for car use.
BACKGROUND OF THE INVENTION
The manufacturing method of a keypad for a contact of character illumination rubber switch made by rubber, which illuminates only either characters or figures, is already well known through the Japan Patent Publication No. HEISEI 5-32850. In this method, a laser beam is irradiated so that the laser beam energy is absorbed into a colored surface layer in the shapes of characters and burns the layer off it.
In order to remove the colored surface layer by means of the laser beam it is necessary to arrange materials such as carbon black on the surface so that the laser beam is readily absorbed into the colored layer. Therefore the available keypads manufactured by irradiating laser beam currently have only dark colors such as black or gray or the like as the colored surface layer. It is possible to emit the laser beam on the colored surface layer of any colors which are not black or gray and to burn it off it. However, the incomplete removal thereof is readily caused within the colored surface layer because the colored surface layer do not completely absorb the laser beam. Moreover, if by increasing the irradiation dose of the laser beam the colored surface layer is removed, removal or burning thereof is caused on the lower colored light permeable layer. Accordingly, by using such a laser beam unit, it is difficult to obtain high quality products and successful marketing of the product can not be realized
SUMMARY AND OBJECTS OF THE INVENTION
It is the primary object of the present invention to manufacture a keypad having color variations which are needed, especially by women and young people, and to provide these color variations for the color keypad for illuminated character contact is mobile communication systems and electrical equipment car components.
The present invention relates to a manufacturing method of a keypad for a contact of character illumination rubber switch. The switch includes a surface enriched in color design variations. The method includes the steps of forming a black or gray intermediate layer over a surface section of a color keypad member for a contact of a character illumination switch of the mobile communication systems, electric equipment or the like. A colored surface layer is formed thereon with any color, especially a colored surface layer which substantially passes the laser beam and is substantially unremovable by the passing of the laser beam through the color surface layer. A laser beam is applied from the upside thereof for passing through the colored surface layer and burning up and removing the intermediate layer. The colored surface layer and the intermediate layer being chosen of a material to have burning up and removal of the intermediate layer by the laser cause removal of the colored surface layer adjacent the burned portions of the intermediate layer.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
REFERENCES:
patent: 3410979 (1968-11-01), Larsson
patent: 4328410 (1982-05-01), Silvinsky et al.
patent: 5182188 (1993-01-01), Cole, Jr. et al.
patent: 5456955 (1995-10-01), Muggli
patent: 5723843 (1998-03-01), Muggli
Lee Edmund H
McGlew and Tuttle , P.C.
Polymatech Co. Ltd.
Silbaugh Jan H.
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