Patent ID: 8564537

Claim:
A wheel module for an input device, said wheel module comprising: a circuit board, wherein at least one switch element is installed on said circuit board; a wheel swinging member disposed over said circuit board, so that said at least one switch element is arranged between said circuit board and said wheel swinging member; a wheel disposed on said wheel swinging member, wherein when said wheel is moved downwardly relative to said wheel swinging member by a specified distance in response to an external force exerted on said wheel, an operating mode of said wheel module is switched from a rotating mode to a swinging mode; and a first elastic member for providing a first elastic force to said wheel, wherein when said external force exerted on said wheel is eliminated, said first elastic force causes said wheel to be moved upwardly relative to said wheel swinging member, wherein when said wheel module is operated in said rotating mode, said wheel is rotatable relative to said wheel swinging member, wherein when said wheel module is operated in said swinging mode and said wheel is tilted in a specified direction, said wheel swinging member is synchronously swung relative to said circuit board to trigger said at least one switch element, wherein said wheel has an operating surface to be manipulated by a user, and a friction-enhancing member is disposed on a to surface of said wheel swinging member, wherein when said wheel module is operated in said swinging mode, said wheel is contacted with said friction-enhancing member.