Touch control apparatus for electronic keyboard instrument
Patent 4615252 Issued on October 7, 1986. Estimated Expiration Date: 
January 25, 2005. 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.
January 25, 2005. 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 ReferencesKeyboard for an electronic musical instrument employing variable capacitors Pressure transducer Pickup apparatus for an electric string type instrument Polymer piezoelectric sensor of animal foot pressure Patent #: 4499394 InventorsAssigneeApplicationNo. 06/695098 filed on 01/25/1985US Classes:84/687, Force or velocity responsive310/338, Force or pressure measuring type310/339, Voltage, spark or current generator338/114, Deformable338/69, Musical instrument playing key actuated338/99, Surfaces pressed together (e.g., compressible type)341/34, Pressure sensitive actuation84/745Keyswitch structureExaminersPrimary: Perkey, William B.Attorney, Agent or FirmInternational ClassesG10H 1/34 (20060101)G10H 1/055 (20060101) Foreign Application Priority Data1984-02-01 JPAbstractA touch control apparatus for an electronic keyboard instrument, comprises a sensor having: an elongated insulating sheet having a set of conductive pattern films on a surface thereof, the elongated insulating sheet being folded and the set of conductive pattern films being formed to be spaced apart from each other; and a pressure-sensitive element sandwiched in a space defined by the folded elongated insulating sheet to be in contact with the conductive pattern films. The pressure sensitive element is deformed when a key of the instrument is depressed to deliver an electrical output through the conductive films representing the magnitude of the key depression. The apparatus is superior in easiness of handling the sensor and of assembling the apparatus.Other References
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