Graphical data entry pad
Graphical input apparatus for electrical equipment
Sensor panel for locating a load
Apparatus for detecting X and Y coordinates of input points
Touch controlled membrane for multi axis voltage selection Patent #: 4444998
ApplicationNo. 06/475419 filed on 03/15/1983
US Classes:338/114, Deformable178/18.05, Resistive338/99Surfaces pressed together (e.g., compressible type)
ExaminersPrimary: Leung, Philip H.
Assistant: Sears, C. N.
Attorney, Agent or Firm
International ClassesG06F 3/033 (20060101)
G01L 1/20 (20060101)
AbstractA touch tablet is provided containing two sheets of insulating material each of which contains a plurality of spaced apart conductive lines. A resistive strip on each sheet contacts and connects electrically one end of each of the plurality of conductive lines on that sheet. Each resistive strip functions as a potentiometer. Mounted between the two sheets and spaced apart therefrom is a conductive middle sheet. The first and second sheets are mounted such that the first and second sets of a plurality of conductive lines on these sheets are orthogonal to each other. A user presses on one of the two sheets to bring all three sheets into contact. The impedence of each potentiometer is a function of the contact point. The potentiometer is used as part of an RC circuit to provide a variable time constant representative of the coordinate of the contact point.