| 摘要 |
PROBLEM TO BE SOLVED: To provide an operator with no sense of discomfort caused by a large clicking sense when the operation of keys is released.SOLUTION: A reaction force generating members 21w, 21b include dome parts 21w1, 21b1 formed in elastic bodies in dome shapes, and are fixed on a support part 31d through base parts 21w3, 21b3. The dome parts 21w1, 21b1 are elastically deformed due to pressing force in axial directions, gradually increase reaction force from an early period in accordance with an increase in an elastically deformed amount, and are buckling-deformed, after the reaction force reaches its peak, to decrease the reaction force drastically. Protrusions 21w5, 21b5 are provided in positions deviating from axes Yw, Yb in inner surface of upper parts 21w11, 21b11 of the dome parts 21w1, 21b1. The dome parts 21w1, 21b1 do not return evenly over the whole periphery, during return after buckling, to diminish a sense of clicking upon return. |
