| 摘要 |
<p>PURPOSE:To have a long-life 'pachinko' ball sensor with less likelihood of being influenced by external factors, by displacing a movable piece with a 'pachinko' ball passing through a sensing hole, varying the distance of a magnetism sensitive part from a magnetized part, and thereby sensing a 'pachinko' ball passing. CONSTITUTION:When a 'pachinko' ball 2 passes a sensing hole 3, a ball sensing part 5a of a movable piece 5 is pushed by the ball 2, so that the movable piece 5 is intruded into a mounting hole 8 against the action of a leaf spring 7. This causes compressive deformation of the leaf spring 7, and the movable piece 5 displaces toward a magnetized part 10, and a magnetism sensitive part approaches the magnetized part 10. The magnetic field of this magnetized part 10 reaches the magnetism sensitive part 6, and a Hall IC produces a Hall electromotive force, and thus passage of a 'pachinko' ball 2 is sensed. After the passage of ball 2 through the sensing hole 3, the movable piece 5 is returned toward the sensing hole 3 by the restorative force of the deformed leaf spring 7 to cause the ball sensing part 5a to protrude in the sensing hole 3, and meantime the magnetism sensitive part 6 moves apart from the magnetized part 10.</p> |
