Force-sensitive key module and force-sensitive switch structure thereof

A force-sensitive key module, comprising:

• a keycap, wherein when a pressing force is provided to the keycap, the pressing force is transmitted through the keycap;
• a pressing element located under the keycap, wherein in response to the pressing force, the pressing element is moved downwardly to perform a pressing action;
• and
• a force-sensitive switch structure located under the pressing element, wherein the force-sensitive switch structure comprises:
• a first protective layer receiving the external force when the pressing action is performed by the pressing element;
• a second protective layer, wherein the second protective layer and the first protective layer are combined with each other and collaboratively formed as a covering structure;
• a first conductive layer installed on an inner side of the first protective layer;
• a second conductive layer installed on an inner side of the second protective layer, wherein the second conductive layer is aligned with the first conductive layer;
• and
• a force-sensitive layer installed on the first conductive layer or the second conductive layer, wherein when the first protective layer is pressed in response to the pressing action of the pressing element, an electric connection between the first conductive layer and the second conductive layer is established, and the force-sensitive layer generates an analog sensing signal in response to the pressing force, wherein when a magnitude of the pressing force is changed, the analog sensing signal is correspondingly changed according to an impedance change of the force-sensitive layer.