Input keyboard for an electronic appliance in entertainment electronics
Patent 5164697 Issued on November 17, 1992. Estimated Expiration Date: 
April 3, 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.
April 3, 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 ReferencesPressure sensitive switch structure Variable resistance switch Push-button switch Pressure detector Patent #: 4847586 InventorAssigneeApplicationNo. 679609 filed on 04/03/1991US Classes:338/69, Musical instrument playing key actuated84/423B, Button type338/114DeformableExaminersPrimary: Lateef, Marvin M.Attorney, Agent or FirmForeign Patent References
International ClassH01C 010/10Foreign Application Priority Data1990-04-11 DEAbstractAn input keyboard (1) contains a switching device (3) for pushbuttons (22) wherein the contact linings (11.1, 11.2) on a printed circuit board (10) are bridged by a countercontact (16) operated by the pushbutton (22). The countercontact (16) consists of a carbonized plastic foil (14) and an electrically conducting layer (17) on the side facing away from the contact linings. By virtue of this arrangement there comes into being a bridging resistance between the bridged conductor strips (12.1, 12.2) that depends on the operating pressure (P) applied to the pushbutton, this resistance being then used to cause a control circuit arrangement (6) to generate a control command (Bf) for setting a particular function and an adjustment command (Bw) for setting a particular value or adjustment rate.Other References
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