Manufacturing method for key tops
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United States of America Patent
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Oct 13, 1998
Grant Date -
N/A
app pub date -
Oct 29, 1996
filing date -
Nov 1, 1995
priority date (Note) -
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Abstract
A manufacturing method for key tops includes the steps of molding a light-shielding film on a to-be-peeled shield by a plane printing, effecting colored printing to provide a readout part at a predetermined position on it in the state of a plane sheet prior to the 3-D molding, then sucking a printed light-shield film sheet on a metal mold with an evacuation system, adsorbing said light-shield film sheet onto the wall face in the metal mold. A push mold may be used with a suction system so as to be positioned in the female mold. Materials such as silicone are put into this metal mold for one-piece molding. A laser processing is effected on the surface of a key top prepared in a 3-D shape to form a desired pattern. By making the light-shield printing and pattern printing in the state of a plane sheet prior to the 3-D molding and effecting only a pattern processing by laser cut in the state of a stereographic shape, a laborious coating has been omitted which also results in improved accuracy of printing and at the same time a reduced number of steps.
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