Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Reexamination Certificate
2005-05-03
2005-05-03
Nguyen, Anthony (Department: 2854)
Typewriting machines
Key-board or key lever-actuating mechanism
Key-cap or key-stem structure
C400S472000
Reexamination Certificate
active
06887001
ABSTRACT:
A key button switch structure for use in a handheld mobile phone, comprises an input button1having a push-down pressure transmitting projection A1and a button inclination preventing projection B3both projected from a bottom surface of the input button, integrally with the input button. Two electrodes A9and B10are formed on a substrate8fixed to a body casing6.A dome-like switch contact7is provided to be pushed down by the push-down pressure transmitting projection A1of the input button when the input button is depressed, thereby to electrically contact both the two electrodes. Thus, since the button inclination preventing projection B3is provided, even in the case that an action center line of the dome-like switch contact is not coincident with an input pressure center line of the input button, when the input button is depressed, the electrodes A9and B10formed on the substrate8are surely electrically interconnected by the dome-like switch contact effectively uniformly collapsed by the push-down pressure transmitting projection A1of the input button.
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Kitamura Hiromu
Saito Shuichi
NEC Corporation
Nguyen Anthony
Young & Thompson
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