The
Touch surface wave has transmitting and receiving piezoelectric
transducers for the X and Y axes mounted directly on the faceplate.
The controller sends five-megahertz electrical to the transmitting
transducer, which converts the signal into ultrasonic waves within the
surface of the glass .these wave are directed across the faceplate by an
array of reflectors .Reflectors on the opposite side gather and direct
the waves to the receiving transducer, which reconverts them into an
electrical signal .the process is repeated for each axis.
When you touch the screen, you absorb a portion of the waves traveling
across it .the received signals for X and Y are compared to the stored
digital maps, the change is recognized, and a coordinate is calculated.
Features of SAW
Pure glass touch screens with superior image
clarity, high resolution and good quality light transition.
Durable, scratch-resistance glass surface
continues to work if scratched.
High touch point density: over 10000 touch points
per square inch.
Good stableness without drift, automatic
correction, accurate operation.
Long life expectance, over 50 million touches in
one location without failure.
Long touch screens warranty is also available.
Finger, gloved hand, and soft stylus activation.
CRT Flat, Spherical, Cylindrical and LCD touch
screens are available.
Analog
Resistive Touchscreen
4-Wire
resistive touch screen is the preferred solution for low cost
applications. It consists of a conductive bottom layer (ITO Glass or
Film) and a conductive top layer (ITO Film). The two layers are
suspended by many very small spacer dots. When a certain point is
touched, the top layer contacts the bottom layer and a voltage charged
by the controller is applied to the bottom layer's electrodes. The
coordinate X axis of the touch point can be detected by measuring the
voltage value thru the top ITO layer and the coordinate Y axis of the
touch point can be detected in the same way by changing voltage input to
the top layer's electrodes.
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South Africa