ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,386,439, issued on Aug. 12, was assigned to CHICONY ELECTRONICS Co. LTD. (New Taipei, Taiwan).
"Roller input device" was invented by Ho-Chin Tsai (New Taipei, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A roller input device includes a base, a roller, a magnetic assembly, and a magnetic-conductive element. The roller is rotatably disposed on the base and includes a main body and magnetic protrusions arranged around a peripheral portion of the main body. The magnetic assembly is disposed on one side of the base and includes an electromagnet and a permanent magnet. The electromagnet includes a coil. The magnetic-conductive element is disposed on...