| 摘要 |
A pointing stick includes a substrate, an input pillar set vertically on the substrate, and at least one strain gauge for sensing pressure and producing pointing signals corresponding to the pressure. A portion of the strain gauge is set between the input pillar and the substrate. The strain gauge includes a first pressure resistor set on an upper surface of the substrate. A first electrode and a second electrode are electrically connected to the first pressure resistor. The first electrode and the second electrode form a loop to let current pass through the first pressure resistor. The first electrode and the second electrode are separated by a gap with a predetermined distance in a pressing direction, which is perpendicular to the surface of the substrate.
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