Patent ID: 6276212
Filing Date: 2001-08-21
Classification: G10K

Abstract:
An ultrasonic transducer comprising:a housing having an axis and a diaphragm centered on said axis at one end of said housing;a cylindrical vibratable mass in said housing centered on said axis, said vibratable mass having a first end secured to and centered relative to an inner surface of said diaphragm and a second end opposite said first end; said vibratable mass being vibratable in a direction along said axis;a second cylindrical mass in said housing centered on said axis, said second mass having a third end with a recess centered on said axis, said second end of said vibratable mass extending into said recess and being secured to said second mass, said second mass resisting vibration of said vibratable mass toward said second mass; andan electrode fixed to a fourth end of said second mass opposite said third end.