Button module and electronic device having the same

摘要

An electronic device includes a housing, a button module and a control board. The button module includes a button cap having a space, a follower movably disposed in the space, and an elastic member. A movable cavity is defined by a portion of the follower located in the space and an inner surface of the button cap. The elastic member is disposed in the movable cavity, and two ends of the elastic member respectively abut against the inner surface of the button cap and the follower. An amount of compression of the elastic member is varied in response to the size of the movable cavity. When the button cap is in an unpressed state, the elastic member has a first amount of compression and generates a restoring force; when the button cap is in a pressed state, the follower abuts against a switch unit of the control board correspondingly.