| 摘要 |
An musical tone control device, employed by an electronic keyboard instrument, comprises a keyboard frame, a stopper member and a sensor. The keyboard frame is located beneath an arrangement of keys in the keyboard and is provided to support the keys in a vertical direction as well as in a horizontal direction. The key is normally pressed upward by a key-return spring. The stopper member comprises a base part, a flexible part, having flexibility In a selected direction, and an edge portion which are assembled together. The base part is fixed to the keyboard frame. The edge portion of the stopper member provides at least a lower-limit stopper for the key. The sensor is attached to the flexible part so as to sense a deformation of the stopper member in the selected direction. An output of the sensor is used to control a musical tone in terms of a specific musical parameter such as pitch. When the key is moved vertically so as to depress down the lower-limit stopper, the stopper member is vertically deformed so that the sensor senses a vertical deformation of the stopper member. When the key is moved horizontally, a horizontal motion of the key is transmitted to the stopper member through a key guide, which is provided to regulate the horizontal motion of the key, so that the sensor senses a horizontal deformation of the stopper member. The sensor is configured by a strain gauge or the like.
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