| 摘要 |
PROBLEM TO BE SOLVED: To provide a push button device capable of detecting the moving speed of a button when it is pushed.SOLUTION: A push button device (1, 10 or 10') comprises: a button part 4 movable along a predetermined direction; support parts (2 and 3) for supporting the button part 4; first magnets (5-1 to 5-4) which are fixed to the support parts (2 and 3), and each of which has a first magnetic pole on the button part 4 side; second magnets (5-5 to 5-8) which are fixed to the button part 4 in such a manner as to face the first magnets and to have a first magnetic pole on the first magnet side, thereby biasing, together with the first magnets, the button part 4 in a direction away from the support parts (2 and 3); a magnetic sensor 6 for detecting the density of magnetic flux which is generated from the first magnets and the second magnets and changes according to a distance between the first magnets and the second magnets; and a detection circuit 7 which determines the moving speed of the button part 4 on the basis of the variation in distance estimated from the changes in the density of detected magnetic flux as well as the time required for the button part 4 to move by the variation. |
