Magnetic film ultrasonic emitter

An ultrasonic emitter device having broad frequency range capacity with relatively large diaphragm displacement compared to typical electrostatic diaphragm movement, said device comprising:

• a core member having means for establishing a first magnetic field adjacent the core member;
• a movable diaphragm extending along the core member and displaced a short separation distance from the core member to allow an intended range of orthogonal displacement of the diaphragm with respect to the core member and within a strong portion of the first magnetic field;
• at least one, low mass, planar, conductive coil disposed on the movable diaphragm and including first and second contacts for enabling current flow through opposing ends of the coil;
• and
• means for supplying variable current flow to the at least one coil for developing a second magnetic field which variably interacts with the first magnetic field to attract and repel the diaphragm at a desired frequency for development of a series of compression waves which may be adjusted to include an ultrasonic frequency range.