Elo TouchSystems Elo IntelliTouch - Manual (Page 14)

1-2 I n t e l l i T o u c h / S e c u r e T o u c h G u i d e
The IntelliTouch Touchscreen
The IntelliTouch surface wave technology touchscreen consists of a glass panel
molded to the shape of a display's face. Each axis of the touchscreen panel has a
transmitting and receiving piezoelectric transducer, and sets of reflector stripes.
See Figure 2.3 on page 10 for details on the construction of an IntelliTouch
touchscreen.
Figure 1.1 IntelliTouch Touchscreen
Surface wave energy is generated by the transmitting transducers mounted in
the corners of the touchscreen. A set of reflector stripes reflects these waves
across the active area of the glass and to the receiving transducer which
reconverts the surface waves into an electrical signal.
When a finger or other energy-absorbing object touches the touchscreen a
portion of the wave is absorbed. The resulting change in the received signal is
analyzed by the controller and a digitized X and Y coordinate is determined. A
Z-axis level is determined by measuring the amount of signal attenuation at the
touch location. The X, Y, and Z coordinates are determined and the controller
transmits them to the computer.