Patent ID: 8890816

Claim:
An input system for an electronic device including a main body, the input system comprising: an input device installed outside of the main body, comprising two location symbols and a plurality of input units denoted by a plurality of corresponding input symbols; a control device installed outside of the main body, for pressing at least one of the plurality of input units for generating an indication signal; a camera installed on the main body and independent to the input device, for taking an image of the control device pressing the input unit, the image including the indication signal, and for taking an image of the input device before the control device presses the input device; and an image processing unit installed in the main body and coupled to the camera, for recognizing the pressed input unit according to locations of the indication signal and the two location symbols in the image and generating input data corresponding to an input symbol denoting the pressed input unit; wherein the input device exists when the electronic device is in power-off state; wherein the input device is a hand-drawn keyboard or a solid keyboard; wherein the control device comprises: an outer tube comprising a first stopper; an inner tube placed in the outer tube, the inner tube comprising a second stopper; an end connecting to the inner tube, the end having a color different from the outer tube, and capable of being hidden inside the outer tube or being exposed outside the outer tube; and an elastic component placed between the first stopper and the second stopper, the inner tube being disposed through the elastic component, for controlling the end to be hidden inside the outer tube or be exposed outside the outer tube; wherein the indication signal is generated according to a color variation in the image of the control device pressing the input unit due to a variation between the end hidden inside the outer tube and exposed outside the outer tube.