JAMES RAYMOND WATSON, PT
Restorative Service Providers at Providence Dr, Southfield, MI

5357062, Oct 18, 1994

Jan 28, 1993

8/010536

Lynn H. Rockwell - Mesa AZ
Kenneth B. Jacobson - Scottsdale AZ
James S. Watson - Phoenix AZ
Steven M. Palay - Phoenix AZ

CalComp Inc. - Anaheim CA

G08C 2100

178 18

In a pen cursor for use in performing writing motions on the surface of a tablet, this is a sensor for mounting in a tip portion of the pen cursor to develop a signal output indicating longitudinal force on a writing tip of the pen cursor. A tip member extends from the tip portion of the pen cursor and is mounted for longitudinal movement. It has a plunger portion extending therefrom within the pen cursor. A resistive member and a conductive member are disposed within the pen cursor behind the plunger portion. The plunger portion forces the resistive member and the conductive member together in electrical contact over a contacting area which is directly proportional to the amount of longitudinal pressure on the plunger portion. A voltage is connected across the contacting area whereby resistance as a function of longitudinal pressure on the plunger portion can be measured.

5408055, Apr 18, 1995

Oct 25, 1993

8/140841

Andrew M. Harris - Phoenix AZ
James Watson - Phoenix AZ

CalComp Inc. - Anaheim CA

G08C 2100

178 19

A device for indicating the phase of the a full-frequency alternating current (AC) magnetic field signal transmitting from the pointing device of a cordless digitizer and for determining if the phase of a half-frequency alternating current (AC) magnetic field signal transmitting from the pointing device is approximately the same or approximately inverted from an immediately preceding half-frequency signal from the pointing device. The indication of the phase of the full-frequency pointing device signal is used by the digitizer logic circuits to determine the location of the pointing device on the tablet's sensing surface. The information concerning the change in phase of the half-frequency signal is used by the digitizer logic circuits to decode the status of various pointing device buttons. If the phase in the induced half-frequency signal is unchanged from the last, this no-change condition represents one binary state. If the phase has changed, the condition represents the other binary state.

5160813, Nov 3, 1992

Sep 27, 1991

7/767112

James S. Watson - Phoenix AZ

Calcomp Inc. - Anaheim CA

G08C 2100

178 19

In an electro-magnetic, cordless digitizer system wherein a transducer emits an AC magnetic field which is detected by a first grid of scanned parallel first wires in a tablet to provide positional data for the transducer in a first axis of a coordinate system and which are detected by a second grid of scanned second wires in the tablet to provide positional data for the transducer in a second perpendicular axis of the coordinate system, a method and associated apparatus for obtaining a phase reference signal; to be used in a demodulator demodulating data signals from the first and second grids of scanned first and second wires. The method comprises the steps of, scanning the first wires to determine ones of the first wires close to a present location of the transducer; connecting to a one of the first wires displaced from the ones of the first wires close to a present location of the transducer a sufficient distance to provide a valid and usable voltage for use in generating a phase reference signal; and, using a voltage from the one of the first wires to generate a phase reference signal to the demodulator when processing data signals from both the first grid of scanned parallel wires and the second grid of scanned wires.

5124509, Jun 23, 1992

Jan 15, 1991

7/643576

Jason Hoendervoogt - Phoenix AZ
James Watson - Phoenix AZ

Calcomp, Inc. - Anaheim CA

G08C 2100

178 19

A battery powered oscillator in a freely movable pointer drives a coil and a divider. A grid of spaced conductors in a base unit is inductively coupled to the coil. A conductive plate that lies parallel to the conductor grid capacitively couples the signal from the divider to a phase locked loop to provide a reference signal that has a constant phase in relation to the oscillator. Detection circuitry uses the signals induced in selected grid conductors and the phase reference signal to determine the location of the pointer relative to the conductors. As an alternative to the phase locked loop, the signal induced in an idle reference conductor can be combined with the capacitively coupled reference signal to aid in demodulating the induced signals. As an alternative to an oscillator in the pointer, the coil may be driven by a signal capacitively coupled from the base unit.

5235142, Aug 10, 1993

Sep 16, 1991

7/760563

Waldo L. Landmeier - Phoenix AZ
James S. Watson - Phoenix AZ

CalComp, Inc. - Anahiem CA

G08C 2100

178 19

In a cordless, electro-magnetic digitizing system having a drive circuit outputting a square wave drive signal of known initial polarity to a transducer coil in a cursor to oscillate the transducer coil and cause a magnetic field output therefrom which is detected in an associated tablet, a method of operation and associated apparatus for determining the phase of a response signal induced by the magnetic field from the response signal itself. The method comprises the steps of, outputting bursts of a square wave drive signal of known initial polarity to the transducer coil; outputting a signal indicating the start of each burst to the transducer coil; additively outputting a single large current square wave signal pulse to the transducer coil of the same polarity and in phase with a first square wave pulse of the square wave drive signal when initially outputting a burst of the square wave drive signal to the transducer coil whereby additive initial drive currents cause the transducer coil to oscillate immediately and produce a detectable first half-wave in a response signal in the tablet; and, employing the first half-wave of the response signal of known polarity to determine the phase.

4939318, Jul 3, 1990

Nov 6, 1989

7/431886

James S. Watson - Phoenix AZ
Dana Doubrava - Phoenix AZ

Calcomp Inc. - Anaheim CA

G08C 2100

178 19

In a digitizer tablet system employing a tablet having equally spaced parallel grid wires disposed in a plane along an axis parallel to the tablet's upper surface and a pen cursor having a sensing coil disposed concentric with and perpendicular to a longitudinal axis of the pen cursor to develop a characteristic output waveform from electromagnetic inductance between the grid wires and the sensing coil, this invention is the method of compensating a calculation of the position of the pen's tip on the tablet's upper surface and along the axis determined from an interpolation of the characteristic output waveform to find its zero voltage crossing point for tilt of the pen cursor longitudinal axis from perpendicular to the tablet's upper surface comprising using voltage values from grid wires next on opposite sides of the zero crossing point to calculate a pen tilt compensation factor.

4794208, Dec 27, 1988

Feb 8, 1988

7/152993

James S. Watson - Phoenix AZ

Calcomp Inc. - Anaheim CA

G08C 2100

178 19

A digitizer wherein the transduction frequency is controlled (automatically or manually) to minimize the interference effect of sources of external AC fields, such as CRT monitors. The digitizer implements the method of operation comprising the steps of, connecting a source of a frequency higher than the frequency to be employed as the transduction frequency of the digitizer to the first input of a counter; receiving input pulses from the source at the first input of the counter; outputting output pulses which are employed to generate the transduction frequency in the digitizer at an output of the counter; selectively setting an initial count value at a second input of the counter; and, repeatedly counting from the initial count value at the second input to a terminal value, outputting an output pulse upon reaching the terminal value, and resetting to the initial count value after outputting each output pulse. The preferred automated method includes reading and saving the induced position voltages being employed by the digitizer, testing the saved voltages for any flutter, and setting the initial count value to an optimum level.

5373118, Dec 13, 1994

Oct 25, 1993

8/140855

James S. Watson - Phoenix AZ

CalComp Inc. - Anaheim CA

G08C 2100

178 19

A device for imparting a signal phase status of an alternating current (AC) magnetic field signal transmitting from a cursor in a cordless digitizer. The device includes an apparatus for causing the cursor to temporarily emit a signal having a frequency which is lower than the frequency of a basic cursor signal, and an apparatus for determining and imparting the signal phase status of the AC magnetic field signal transmitting from the cursor as derived from the temporarily emitted lower frequency signal.