Push-Pull Electret Transducer with Controlled Restoring Force for Microphones and Energy Harvesting

Unmet Need
The traditional push-pull headphones and loudspeakers currently only generate limited amounts of power due to their small size. The limiting factor in the power output for these devices is the amount of movement of the diaphragm and the charge level of the electret. While the power generated by the current push-pull system is sufficient for commercial headphones and loudspeakers, it is insufficient for devices that need to operate at high temperatures and underwater.
 
Technology Overview
Two new mono-charged push-pull (PP) electrict transducers are proposed where the resonance frequency and static pressure operating range can be pre-determined by adjusting the restoring force spring constant. The electrict diaphragm static position is balanced between the two electrodes for the push-pull arrangement as a microphone. A more traditional microphone with variable restoring force is also possible.
 
Stage of Development
Concept
 

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