Piezoelectric or pyroelectric polymer input element for use as a transducer in keyboards
Patent 4234813 Issued on November 18, 1980. Estimated Expiration Date: 
April 10, 1999. 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.
April 10, 1999. 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 3648279 3699294 Process for producing polymeric piezoelectric elements and the article formed thereby Piezoelectric key board switch Polymeric piezoelectric key actuated device Patent #: 3940637 InventorsAssigneeApplicationNo. 06/028822 filed on 04/10/1979US Classes:310/366, More than two310/339, Voltage, spark or current generator310/800, PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)341/22, Including keyboard or keypad341/34Pressure sensitive actuationExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmInternational ClassesH01L 37/02 (20060101)H01L 41/113 (20060101) H01L 37/00 (20060101) Foreign Application Priority Data1978-04-10 JPAbstractAn input element for use as a transducer in keyboards is disclosed, which utilizes a polymeric material having piezoelectric or pyroelectric property as a stimulus-receiving portion of the element. The element has a plurality of stimulus-receiving portions. One face of each of stimulus-receiving portions has mutually independent electrodes, of which one is for detecting signal and another is for earthing, and another face of each stimulus-receiving portions has mutually independent electrodes, of which one is for detecting signal and another is for earthing. The signal-detecting electrode on the one face is disposed corresponding to the earthing electrode on the another face. | |
