Patents by Inventor Geoffrey D. Wilson

Geoffrey D. Wilson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6630929
    Abstract: A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: October 7, 2003
    Assignee: ELO Touchsystems, Inc.
    Inventors: Robert Adler, Joel Kent, Jeffrey L. Sharp, Geoffrey D. Wilson
  • Patent number: 6506983
    Abstract: A general method is described for producing an inexpensive touchscreen system that provides accurate positional information and compensates for manufacturing variations without complicated sensor arrangements. Utilizing a set of sensed signals that are unique to each location on the touchscreen sensor, equations for X and Y are derived via curve fitting methods. The coefficients of the equations are stored with the sensor. During touchscreen operation the coefficients are used to calculate X and Y to the desired accuracy directly and independently.
    Type: Grant
    Filed: March 5, 1999
    Date of Patent: January 14, 2003
    Assignee: ELO TouchSystems, Inc.
    Inventors: Joe Henry Babb, Geoffrey D. Wilson
  • Patent number: 6504530
    Abstract: A method and apparatus for discriminating against false touches in a touchscreen system is provided. The system is designed to confirm a touch registered by one touch sensor with another touch sensor, preferably of a different sensor type, prior to acting upon the touch (i.e., sending touch coordinates to the operating system). If the touch registered by the first touch sensor is not confirmed by the second touch sensor, the touch is invalidated. Thus the strengths of one type of sensor are used to overcome the deficiencies of another type of sensor. In one aspect, the secondary touch sensor comprises a force sensor to discriminate between true and false touches on other types of touch sensors, such as contaminants on optical and surface acoustic wave sensors, noise or weak signals on capacitive sensors, etc. The force sensor may be a simple one-element system that merely indicates that a touch has occurred or a multi-element system that can provide confirming or supplementary coordinate data.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: January 7, 2003
    Assignee: ELO Touchsystems, Inc.
    Inventors: Geoffrey D. Wilson, Victor E. Borgnis, Joel Kent, Mike Lewis, Drew Loucks, James Roney, Michael Bruno Patti
  • Patent number: 6492979
    Abstract: A method and apparatus for discriminating against false touches in a touchscreen system is provided. The system is designed to confirm a touch registered by one touch sensor with another touch sensor, preferably of a different sensor type, prior to acting upon the touch (i.e., sending touch coordinates to the operating system). If the touch registered by the first touch sensor is not confirmed by the second touch sensor, the touch is invalidated. Thus the strengths of one type of sensor are used to overcome the deficiencies of another type of sensor. This system is particularly well suited to meet the demands of an outdoor or semi-outdoor application. In one embodiment, one or more force sensors are used as the false touch sensor and a projective-capacitive sensor is used as the position coordinate determining sensor. In another embodiment, a projective-capacitive sensor is used as the false touch sensor.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: December 10, 2002
    Assignee: Elo TouchSystems, Inc.
    Inventors: Joel Kent, Geoffrey D. Wilson
  • Patent number: 6396484
    Abstract: A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: May 28, 2002
    Assignee: Elo Touchsystems, Inc.
    Inventors: Robert Adler, Arie Ravid, Geoffrey D. Wilson
  • Patent number: 6278444
    Abstract: A method and apparatus for making a five-wire touch-screen compatible with a four-wire interface is provided. A non-microprocessor-based converter is used that can be integrated directly into the touch-screen housing or the screen-to-interface ribbon cable. In one aspect of the converter, an analog logic and switching element routes the reference voltage from the four-wire controller to a current injection control device. The current injection control device applies a constant current to the outermost screen member of the touch-screen. When the outermost screen member and the innermost screen member of the touch screen come into contact, the current from the outermost member is injected into the resistive coating of the innermost member at the point of contact. The injected current is distributed to the four contact electrodes of the innermost member in direct proportion to the coordinates of the point of contact.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: August 21, 2001
    Inventors: Geoffrey D. Wilson, Joe H. Babb
  • Patent number: 5940065
    Abstract: A general method is described for producing an inexpensive touchscreen system that provides accurate positional information and compensates for manufacturing variations without complicated sensor arrangements. Utilizing a set of sensed signals that are unique to each location on the touchscreen sensor, equations for X and Y are derived via curve fitting methods. The coefficients of the equations are stored with the sensor. During touchscreen operation the coefficients are used to calculate X and Y to the desired accuracy directly and independently.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: August 17, 1999
    Assignee: Elo TouchSystems, Inc.
    Inventors: Joe Henry Babb, Geoffrey D. Wilson
  • Patent number: 5804773
    Abstract: An improved touch sensor having a resistive surface and simplified corner electrodes for introducing electrical potentials into the resistive surface. Improved positional accuracy is achieved by selectively energizing the touch sensor transversely (either vertically or horizontally) and diagonally, in either direction. As a result, equipotential lines formed in this manner are nearly perpendicular to each other (from the two energizations) throughout a larger area of the touch sensor so that increased accuracy of position coordinates is achieved over this larger area. Provision is made to determine the quadrant of touch and to optimize the energization to achieve the increased accuracy in that particular quadrant of touch.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: September 8, 1998
    Assignee: Elo TouchSystems, Inc.
    Inventors: Geoffrey D. Wilson, Jeffrey L. Sharp