Grating transducer for acoustic touchscreens
First Claim
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1. An acoustic touch sensing device, comprising:
- (a) a substrate, having a surface;
(b) an acoustic wave transducer, coupling to a first wave, being a bulk wave, propagating through said substrate along an axis intersecting said surface;
(c) a diffractive acoustic wave mode coupler, coupling energy of said first wave to a second wave having a converted wave mode with appreciable energy at said surface and propagating along an axis parallel to said surface; and
(d) means for detecting a perturbation of the energy of said second wave.
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Abstract
An acoustic touch sensing device, comprising a substrate, having a surface; and an acoustic wave transducer, transducing a bulk wave in said substrate propagating through said substrate along an axis intersecting said surface, wherein energy of said bulk wave is coupled to a wave having a converted wave mode with appreciable energy at said surface and propagating along said surface. The device may include a set of scattering centers to couple the bulk wave to a Rayleigh wave or plate wave. The Rayleigh wave or plate wave may be dispersed over a region of the substrate, and analyzed to detect a perturbation indicative of a position of touch.
301 Citations
73 Claims
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1. An acoustic touch sensing device, comprising:
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(a) a substrate, having a surface; (b) an acoustic wave transducer, coupling to a first wave, being a bulk wave, propagating through said substrate along an axis intersecting said surface; (c) a diffractive acoustic wave mode coupler, coupling energy of said first wave to a second wave having a converted wave mode with appreciable energy at said surface and propagating along an axis parallel to said surface; and (d) means for detecting a perturbation of the energy of said second wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 71, 72, 73)
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55. A substrate for an acoustic sensing device, having a region, and a surface, comprising:
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(a) an acoustic transducer, coupling to a bulk wave in said substrate having an axis of propagation intersecting said surface; (b) a diffractive acoustic wave mode coupling structure, formed proximate to said surface, adapted to convert acoustic wave energy of the bulk wave to a wave propagating along an axis parallel to said surface; and (c) means for detecting acoustic converted acoustic wave energy in a manner adapted for determining a position of a perturbation thereof. - View Dependent Claims (56, 57)
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58. A method of sensing touch on a substrate having a surface, comprising the steps of:
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transducing a bulk wave in the substrate propagating through said substrate along an axis intersecting the surface; diffractively coupling energy of the bulk wave to a wave having a converted wave mode with appreciable energy at the surface and propagating along an axis parallel to the surface; and detecting a perturbation of the wave having a converted wave mode. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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Specification