| 摘要 |
PURPOSE:To operate a keyboard switch stably operation even when a key or hammer abuts slantingly on the keyboard switch by forming a pressed part in a plane and providing with a projection part on a pressing part which comes into one-point contact with the pressed part. CONSTITUTION:The keyboard switch 4 which is arranged below the switch pressing part 12 of the hammer 3 and fitted onto the top surface of a printed wiring board 16 consists of a rubber switch, whose rubber-made main body part 16 consists of a rear-side horizontal part 17a and a front downward slanting part 17b connecting with the horizontal part 17a; and this horizontal part 17a faces the projection part 14 of the switch pressing part 12 across a slight gap. In this case, while the horizontal part 17a of the keyboard switch 4 being the pressed part is formed flatly, the projection part 14 of the switch pressing part 12 of the hammer 3 being the pressing part is formed hemispherically. Therefore, the hammer 3 comes into one-point contact with the keyboard switch 4 without fail regardless of the slanting angle of the hammer 3 at the time of the depression of the key switch 4. |
