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Acoustic plate mode touch screen

Acoustic plate mode touch screen

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This touch screen consists of a plate of glass provided with transducers which divide the plate into two perpendicular sets of n and m acoustic delay lines. The intersections of these delay lines define a menu of n × m squares. The acoustic wave propagates in a symmetric mode at a frequency chosen to give a maximum attenuation in the presence of water on the plate. Each delay-line is part of a loop which oscillates periodically except when a finger is pressed onto the surface of the delay line.

References

    1. 1)
      • Adler, R., Desmares, P.J.: `An economical touch panel using SAW absorption', IEEE Ultrason. Symp. Proc., 1985, p. 499–502.
    2. 2)
      • E. Dieulesaint , D. Royer , O. Legras . (1990) , Ecran tactile á ondes élastiques guidées à boucle oscillante.
    3. 3)
      • I.A. Viktorov . (1967) , Rayleigh and Lamb waves.
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