| CPC H05K 1/0284 (2013.01) [G06F 3/014 (2013.01); G06F 3/02 (2013.01); G06F 3/0304 (2013.01); H05K 1/028 (2013.01)] | 10 Claims |

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1. An input device, comprising:
a housing;
a circuit board, disposed in the housing;
an optical module, disposed on the circuit board for detecting the displacement of the input device relative to a reference surface;
a movable member, movably connected to the housing and protruding from an outer surface of the housing, wherein the optical module is affixed in the movable member; and
a switch element, disposed on the circuit board, wherein when the input device moves toward the reference surface and the movable member presses the reference surface, the movable member is pushed by the reference surface into the housing to actuate the switch element.
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