Ultrasonic transducer

摘要

An ultrasonic transducer (10) comprises a housing (12) having an axis (52) and a diaphragm (60) centered on the axis (52) at one end (62) of the housing (12). A cylindrical vibratable mass (74) is disposed in the housing (12) and centered on the axis (52). The vibratable mass (74) has a first end (76) secured to and centered relative to an inner surface (80) of the diaphragm (60) and an opposite second end (84). The vibratable mass (74) can be vibrated in a direction along the axis (52). A second cylindrical mass (90) is disposed in the housing (12) and centered on the axis (52). The second mass (90) has a third end (92) with a recess (100) centered on the axis (52). The second end (84) of the vibratable mass (74) extends into the recess (100) and is secured to the second mass (90). The second mass (90) resists the vibration of the vibratable mass (74) toward the second mass (90). An electrode (110) is fixed to a fourth end (94) of the second mass (90) opposite the third end (92).