| 摘要 |
A key module for portable devices includes a PCB having at least one pair of high resistance film and welding point, a rubber key having a protruded key head, and a set of upper case and bottom case. The rubber key has two conducting carbon arcs opposite to the at least one pair of high resistance film on a concave backside thereof. A top of the head portion has a concave on a middle portion thereof and two protrusions on right and left ends thereof for specific input functions. The upper case has at least one through hole for revealing the concave and the protrusions of the head portion while the rubber key and the PCB are covered by the upper and bottom cases.
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