| 摘要 |
PURPOSE:To prevent overheating by providing a temperature regulating unit consisting of a material of a configuration, changed according to temperature. CONSTITUTION:An ultrasonic actuator is constituted of a cantilever beam 1, aluminum washers 2, 5, piezoelectric vibrators 31, 32, terminal plates 41, 42 and a cap bolt 6. Temperature regulating units 201, 202, made of a shape memory alloy and showing a chevron shape at a normal temperature, are formed between the beam 1 and the washer 2. As a result, the cantilever beam 1 is deformed by the temperature rise of a pressing unit whereby contact between the cantilever beam 1 and the washers 2 is eliminated and the ultrasonic actuator may be stopped. |
