Electrodynamic Transducer in Ultrasonic Mode

An electrodynamic transducer comprising:

• a coil;
• a plate comprising a structural rigidity increasing feature;
• and
• a membrane comprising an aperture within which the plate is located, and wherein the membrane and the plate partially overlap, and wherein the membrane and plate are adhered to one another at the partial overlap;
• wherein the electrodynamic transducer is adapted to generate a sound pressure level in the human-audible acoustic range and the ultrasonic range.

An electrodynamic transducer comprising:

• a coil;
• a plate adhered to the coil, the plate comprising a structural rigidity increasing feature;
• and
• a membrane comprising an aperture within which the plate is located, and wherein the membrane partially overlaps the plate and wherein the membrane and plate are adhered to one another at the partial overlap;
• wherein the electrodynamic transducer is adapted to generate a sound pressure level in the human-audible acoustic range and the ultrasonic range.