Patent ID: 7996050

Claim:
An input device for an electronic device, the input device comprising: a base defining an open region, and having grooves facing each other; a frame having protrusions and pivotally connected to the base to pivot with respect to the base by connection between the grooves and the protrusions; a roller member rotatably supported by the frame and partially extending though the open region of the base; at least one button pivotally connected at a side of the base; a circuitry supporting substrate disposed below the base and the frame, and having at least one switch operatable by pressing the frame or the roller member; and a rotation sensor module that senses rotation of the roller member, the rotation sensor module including: a rotation sensor located on the circuitry supporting substrate; a ring magnet located on a shaft portion of the roller member, the ring magnet having a plurality of alternating North and South poles; and a click magnet located between the ring magnet and the frame, wherein a cutout portion is formed in the frame, and is located between the rotation sensor and the ring magnet, and wherein the click magnet includes a North pole arranged above a South pole so as to provide slight resistance to the rotation of the roller member, and is mounted at a surface of the frame adjacent to the cutout portion.