SURFACE ACOUSTIC WAVE (SAW) TOUCH SCREENS

WHAT ARE SAW TOUCH SCREENS?

Surface Acoustic Wave (SAW) technology is one of the most advanced types of touch screen solutions available in the touch screen market. SAW resistive touch screen technology uses ultrasonic waves that pass over the surface of the touchscreen panel. When the panel is touched, a portion of the wave is absorbed. This change in the waves then registers the position of the touch event and sends this information to the controller for processing. The controller then sends electrical signals to the transmitting transducer, which converts the signal into ultrasonic waves.

When compared to capacitive and resistive touch screens, surface acoustic wave technology is superior. It provides better image clarity, resolution, and higher transmission of light. Because the SAW resistive touch panel is all glass, there are no layers that can be worn down; therefore, this technology has the longest life, especially when compared to other touch screen technologies on the market. SAW resistive touch panels have a quick response time, and can recognize the location and amount of pressure applied.

SAW resistive touch panels and screens offered by Nelson-Miller come in sizes ranging from 8 to 23 inches with diagonal CRT sizes also available. These touch screens can be used with a bare finger, gloved finger, or stylus, and come with shielded connectors and 4096 X 4096 resolution. They provide stable “drift-free” operation, meaning the touch response is always accurate.

Often utilized in ATMs, amusement parks, public information kiosks, computer based training and other high traffic indoor environments, SAW touch screens are not recommended to be used outdoors, as deep scratches in the glass surface or contaminants like dirt, insects and water droplets can interfere with the touch.

With an extra-long operating life sometimes exceeding 50 million touches in one location, SAW touch screens offered by Nelson-Miller are an ideal solution for a variety of industries.

SAW - HOW IT WORKS

A known sound wave is transmitted along both axes of the glass surface. When the finger or pen makes contact with the screen the sound wave is attenuated. Speed of sound is constant so time is used to determine the location of the attenuation in both the X and Y Axis.

Simple transducers on a glass surface mean that there is nothing to wear out.

KEY FACTS

  • Available in sizes from 8" to 23" diagonal CRT sizes also available
  • Highest Clarity, most durable touchscreen solution
  • All glass solution with no coatings to wear out
  • Gloved finger, finger or stylus activation
  • 4096 x 4096 resolution
  • Shielded connector

ALL-GLASS FEATURES

  • Long life (50 million touches)
  • 7H hardness rating
  • Outstanding clarity

NM-SAW RESISTIVE TOUCH SCREEN PERFORMANCE DATA

ConstructionAll Glass
Operating Voltage12 Volts DC
Transmission> 92%
Surface Hardness= 7H
Surface TreatmentAnti-glare (approximately 90 Gloss)
Input Force80g
Response Time< 20ms
Operating Temperature0C – 65C
Number of Touches> 50 Million Actuations
Linearity< 1.0%
ConnectorShielded C

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