Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Applying indicia or design
Patent
1994-07-27
1996-05-07
Davis, Robert
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Applying indicia or design
261135, 261163, 261259, B29C 4318, B29C 4320
Patent
active
055143199
ABSTRACT:
A fabrication method for an improved structure of a rubber keypad, particularly such a keypad used in a calculator, a telephone set, or another control module. The process first forms several protruding blocks arranged appropriately on a transparent, thin rubber plate. The protruding blocks are then marked with selected characters by painting, and the third rubber plate is then placed inside an upper and a lower mold for high-temperature, high-pressure pressing and punching. The mold is also provided with several rubber members to form a second rubber plate. The protruding blocks provided on the thin rubber plate are integrated with corresponding protruding blocks formed on the second rubber plate by the lower mold. Thus, the protruding blocks formed with characters and symbols, and the corresponding protruding blocks are combined, forming a keypad with layered character pads. Since the keypad structure has its characters printed between the layers, the discoloring of the keypads can be prevented. The keypad is suitable to be installed in a telephone set with its own light source, eliminating the need to paint the surface of the keypad with a dark color and simplifying the fabrication process.
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