| 摘要 |
<p>A touch position sensor comprising a glass substrate capable of supporting 5.53 MHz Rayleigh-type waves propagating therein, said substrate having a touch surface, said substrate comprises SiO 2 as a main component, wherein the substrate comprises a low acoustic loss glass in which silicon-oxygen bonds are replaced with alternate covalent bonds, strong ionic bonds, or sterically constrained ionic bonds sufficient to reduce an acoustic loss to less than or equal to about 0.5 dB/cm acoustic attenuation for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5 inch wide wedge transducers mounted on the glass under test, the substrate having a surface which is compressed with respect to a bulk of the substrate, to thereby harden the surface, a transducer coupled to said substrate, for imparting a Rayleigh-type wave propagating along an axis into said substrate through the compressed surface, and a set of acoustically reflective arrays disposed on the compressed surface along said axis for reflecting portions of said Raylcigh-type wave propagation in the substrate having a range of characteristic time delays across the touch surface of said substrate, wherein a touch on said substrate touch surface perturbing propagation of the Rayleigh-type wave intersecting the position of said touch, and for subsequently determining the axial displacement of the touch on the substrate.</p> |
