Touch panel system and method
Hand-held musical instrument and systems including a man-machine interface apparatus Patent #: 4430917
ApplicationNo. 07/140885 filed on 01/04/1988
US Classes:178/18.01, Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry)178/20.01Writing digitizer circuit
ExaminersPrimary: Schreyer, Stafford D.
Attorney, Agent or Firm
International ClassG06F 3/033 (20060101)
AbstractSelected touch point locating apparatus has an array of two or more electrical touch members constituted by impedance elements coupled to a circuit for causing electric current to flow through a selected touch point as the algebraic sum of separate currents through the electrical touch members. The relative amplitudes are translated into at least two signals corresponding to the location in two axes of the selected touch point.