Piezoelectric snap action switch
May 24, 2011. 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 2714642 Piezoelectric key board switch Polymeric piezoelectric key actuated device Snap action mechanical-electrical piezoelectric transducer Piezoelectric multimorph switches Thin film, thermoplastic piezoelectric switches Pressure sensitive switch Output circuit for piezoelectric polymer pressure sensor Piezoelectric snap actuator Hail sensor InventorAssigneeApplicationNo. 509483 filed on 04/16/1990US Classes:310/339, Voltage, spark or current generator200/181ELECTROSTRICTIVE OR ELECTROSTATICExaminersPrimary: Dougherty, Thomas M.Attorney, Agent or FirmInternational ClassesH01H 013/26H01L 041/113 AbstractA piezoelectric snap action switch for connecting at least two conductive elements via first and second upwardly convex snap action plates disposed in an overlapping manner with respect to each other and respectively connected to the respective conductors. A piezoelectric polymer film with electrodes on respective surfaces thereof is disposed between the snap action plates so that upon depression of the snap action plates the piezoelectric polymer film is caused to extend or contract along a surface thereof so as to conduct an electrical signal between the electrodes on its respective surfaces. The electrical signal is then conducted between the conductors via the electrodes by electrically coupling the electrodes to the snap action plates. The resulting structure is quite rigid so that the switch is virtually insensitive to vibration, and because of the plural snap action plates, metal lead attachment is greatly facilitated.Other References
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