A device for the recording of the instantaneous location of a sensing probe such as a pencil or stylus on the surface of a plate, made of piezoelectric material in which mechanical wave fronts are caused to travel in the x- and y- directions for detecting the coordinates of the location of the probe or stylus. Means for producing the mechanical wave trains in the plate are provided at the edges of a predetermined area of the surface of the piezoelectric plate and these means are arranged and dir...

A digitizer tablet using a pressure-sensitive pointing device preferably containing a linear transducer is provided with the means to convert linear pressure signals to logarithmically-related output counts. The conversion means is programmable to allow outputting of a logarithmically or a linearly related count for use by an application program.

A signal input sheet having a flexible upper laminate and a lower laminate. The upper laminate includes either a conductive layer or a resistive layer on its lower surface as a first layer and at least one hand-written input area and at least one binary data input area on its upper surface. The lower laminate includes either a conductive layer or a resistance layer on its upper surface as a second layer, however, at least one of the first and second layer is formed as a resistive layer. Elastic ...

A touch controller is presented that comprises a touch sensor employing a resistive membrane, and an analog electronic circuit that accurately measures the touch position and the touch pressure on the sensor. Several variations of the electronic circuit are presented based on the principle of providing a constant current through the touch sensor, measuring the position with a differential amplifier, and measuring the touch pressure at the output of the current regulator. The touch sensors that m...

A stylus having a pressure sensitive side switch for use with digitizer apparatus is disclosed. The pressure sensitive side switch is activated by the application of pressure thereto substantially normal to the axis of the stylus by the finger of a user. In the illustrated embodiments, the pressure sensitive switch comprises a movable element, and the switch provides a signal related to movement of the movable element substantially normal to the stylus axis. The switch output in the preferred em...

A transformer and switching regulator that prevents winding's breakdown caused by the leakage magnetic field. A transformer has a core having an air gap, and a winding wound around the core. The turn density of the winding is made least on the air gap. The switching regulator has such a transformer.

When there exist two X coils that generate voltages of the same values during the X coil-scan operation (yes in S314), the CPU 56 discards the position coordinate table 58a that is already stored in the work area, and reloads a new position coordinate table 58a from the ROM 58, and then stores the position coordinate table 58a in association with the pen attribute data that is detected in S310. Then, the CPU 58 calculates a ratio r between the detected value d and the reference value g in S318, ...

A high efficiency passive pointer digitizer system comprising first and second sets of orthogonal and substantially coplanar conductors, a signal generator for generating a driving signal selectively along the first set of conductors, a movable pointer inductively coupled to the first and second sets of conductors, the pointer including a tuned circuit responsive to the driving signal for radiating a positional signal, a signal detector for detecting a positional signal induced in the second set...

This invention relates to a method for toggling between operation modes of a touch control device, being applied in an electronic data processing device with a touch control device and providing an electronic data processing device capable of toggling its operation between a first coordinate operation mode and a second coordinate operation mode to use the input of the touch control device, which comprises the steps of: setting a predetermined area of a touch control device as a switching mode ar...

A digitizer tablet providing hysteresis compensation in which the X and Y coordinates of a pointing device are measured at different times. In order to enable the tablet to report X and Y coordinates that when displayed will more accurately reflect the pointing device movements, a correction algorithm, built, for example, into the controlling software, estimates and reports what the first measured coordinate would have been, measured when the second coordinate is measured, based upon the calcula...