Abstract
The behavior of an annular, edge-supported, foil electret earphone is examined in a two-step procedure. First, the electret static deformation is found using a perturbation series approach. A criterion for static stability is developed and shown to establish an upper limit to the maximum stable static deflection. Second, the dynamic foil electret motion is determined. The dynamic motion is divided into two parts: a linear response and a nonlinear response. Experimental measurements of capacitance and the sound pressure generated in a 6-cm3 cavity compare favorably to the analytical predictions.
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