Patent ID: 8437143

Claim:
An electronic device, comprising: a housing; a keypad received in the housing and comprising a plurality of buttons, the keypad rotating when an external force is exerted thereon and returning to the keyboard's original state when the keypad is released; a first conductive surface attached to the bottom of the keypad and rotatable with the keypad, the first conductive surface comprising a plurality of first contact portions, the adjacent contact portions being different from each other; a second conductive surface fixed in the housing and arranged below the first conductive surface, the second conductive surface being spaced apart from the first conductive surface, a structure of the second conductive surface being the same as the first conductive surface, the second conductive surface comprising a plurality of second contact portions, the shape of each of the second contact portions being different from one of the first contact portions above the each of the second contact portions in an initial state; a sensing unit configured to generate an activation signal when one of the first contact portions contacts one of the second contact portions whose shape is the same as the one of the first contact portions; and a processing unit configured to determine which button is pressed, determine that one pressed button is activated upon receiving the activation signal, and execute a function corresponding to the activated button.