| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide almost fixed keying characteristics even when the weight of a weight is changed. SOLUTION: Corresponding to plural keys 2 provided on a keyboard chassis 1 so as to be turned vertically, hammer arms 5 are provided so as to turn and displace respectively with keying operation, a screw hole is provided at the prescribed position of a weight attaching part 9 located within a fixed distance from the turn center of the hammer arm 5, and a weight control weight 8 to be attached to each hammer arm 5 is attached while making the center of gravity of a weight member 17 corresponding to this screw hole. Therefore, even when the weight of the weight control weight 8 is changed for changing the feeling of key touch, the distance from the turn center of each hammer arm 5 to the center of gravity of the weight control weight 8 is not changed but fixed for each hammer arm 5. Thus, the turn cycle of each hammer arm 5 and the return time of each key 2 can be almost fixed so that the almost fixed keying characteristics can be obtained.</p> |
