SCROLL OPERATION UNIT AND MOUSE HAVING THE SAME

摘要

PROBLEM TO BE SOLVED: To improve the operability of a scroll operation unit by making the scroll operation unit small in size. SOLUTION: This scroll operation unit has an operating part 36 operated by an operator, a permanent magnet 39 that is moved in accordance with an operation of the operating part, Hall elements 33 and 34 for outputting a voltage signal in accordance with a position to which the permanent magnet is moved and a signal processing circuit 45 for processing the output of the voltage signal from the Hall elements 33 and 34 and outputting a signal for scroll. The weight of the permanent magnet 39 itself returns the operated operating part to its reference state before being operated. The signal processing circuit 45 discriminates whether the return motion of the operating part to the reference state from its operated state is due to a return mechanism or due to the movements of fingertips of the operator, and prevents the signal for scroll from being outputted when the signal processing circuit 45 decides that the return motion is due to the return mechanism.