| 摘要 |
PURPOSE:To obtain a good response and follow up even fine variation by providing a vibrator which is provided in a tube part and vibrates with an air flow and a pickup means which detects the vibration of the vibrator. CONSTITUTION:The tube part 1b which reaches an air discharge opening 1d from a blow-in opening part 1a is provided and a neck part 1c which is reduced, specially, in diameter is formed almost at the center part of the tube part 1b. Therefore, the speed of exhalation which is blown in from the blowing opening part 1a is fastest at the neck part 1c. The vibrator (sensor line) 2 is extended at the neck part 1c and so tensed as to vibrate with a Karman vortex. In a main body, permanent magnets 3a and 3b are provided as the pickup means across the neck part 1c. Then the exhalation blown in by a player is passed through the tube part 1 and its speed is detected. Consequently, the good response is obtained and fine variation of the exhalation can be detected. |
