The control card sends electrical signals to transmitting transducers of both X and Y axes. The transducers convert these electrical signals from the control card into ultrasonic waves sent to the array of reflectors on the glass surface, and the acoustic waves are directed across to the front surface of the glass by the array of reflectors (the degree of the array of reflectors depends on the updating design). The opposite reflectors will gather and direct waves to the receiving transducers which will convert the waves into the electrical signals.
When a user touches the screen, the touch point coordinate is calculated by the control card comparing the received average amplitude of vibration of the acoustic wave signals and reference average waveform acquired when the touchscreen is in an untouched condition. The controller is capable of detecting the stay time of dirt, dust, water drops, scratches and other contaminants on the screen and then ignores them. If the contamination is removed, the controller relearns the original reference average waveform.
。Gaming, lottery, and amusement
。Vending and ticket sales
。Public pay phones
。Banking / financial transactions