Bimorph transducer made from polymer material
Patent 4400634 Issued on August 23, 1983. Estimated Expiration Date: 
December 9, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 9, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3354373 3809828 Electromechanical transducers Patent #: 4250415 InventorAssigneeApplicationNo. 06/214723 filed on 12/09/1980US Classes:307/400ELECTRETSExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmInternational ClassesH01L 41/09 (20060101)H04R 19/00 (20060101) H04R 19/01 (20060101) Foreign Application Priority Data1979-12-28 FRAbstractThe invention relates to bimorph electromechanical transducers made from polymer material.It specifically relates to a transducer comprising a plurality of superimposed dielectric sheets for forming a bimorph structure, whose deformations are controlled in linear manner by a voltage. None of the sheets is piezoelectric. The linearity of operation is obtained because at least one of the dielectric sheets carries a permanent electric charge.The invention is applicable to the construction of microphones, telephone receivers, loudspeakers, as well as to the construction of optical components, whose precise, small displacements it is desired to control.Other References
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