Acoustic condition sensor employing a plurality of mutually non-orthogonal waves
First Claim
1. A substrate for an acoustic touch sensor system comprising:
- an acoustically transmissive medium having a surface with a touch sensitive region having at least one side;
at least two reflective arrays, disposed parallel to one another and on the same side of the touch sensitive region, together having a two dimensional Fourier transform with at least two useful spacing vector components.
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Accused Products
Abstract
A touch sensor, having an acoustic wave transmissive medium having a surface and a touch sensitive portion of the surface, a transducer system for emitting acoustic energy into the medium, and a receiver system for receiving the acoustic energy from the substrate as at least two distinct sets of waves, a portion of each of which overlap temporally at the receiver system or overlap physically by propagating in the touch sensitive portion along axes which are substantially non-orthogonal, the receiver system determining a position or a waveform perturbing characteristic of a touch on the touch sensitive portion. The receiver may be an amplitude detector or be sensitive to a phase-amplitude characteristic of the received acoustic waves.
183 Citations
19 Claims
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1. A substrate for an acoustic touch sensor system comprising:
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an acoustically transmissive medium having a surface with a touch sensitive region having at least one side; at least two reflective arrays, disposed parallel to one another and on the same side of the touch sensitive region, together having a two dimensional Fourier transform with at least two useful spacing vector components. - View Dependent Claims (2, 3, 4, 5)
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6. An acoustic sensor comprising:
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an acoustically transmissive medium, having at least one surface adapted for sensing proximity of an object; at least two sets of acoustically reflective elements formed on said medium, each set of elements having at least two elements and forming a respective reflective array having at least one useful spacing vector component of its two-dimensional Fourier transform, a spacing vector of a first reflective array being non-orthogonal and non-identical to a spacing vector of a second reflective array. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19)
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17. A touch sensor comprising:
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an acoustic wave transmissive medium having a surface, at least a portion of said surface being adapted for sensing a proximity of an object; and an array, associated with said medium, having a plurality of spaced elements for scattering portions of an incident acoustic wave as waves each having a different propagation vector than said incident acoustic wave, and passing other portions unscattered, said array being situated along a path, said array having associated propagation vectors of scattered portions of the acoustic wave which are not substantially perpendicular to the incident acoustic wave over the array, said path being distinct from a segment parallel and adjacent to a side of a rectangular region of a small solid angle section of a sphere.
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18. A method of forming an acoustic sensor comprising:
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providing an acoustically transmissive medium having at least one surface adapted for sensing proximity of an object; forming on the medium an array, having a plurality of spaced elements for scattering portions of an incident acoustic wave as waves each having a different propagation vector than said incident acoustic wave, and passing other portions unscattered, said array being situated along a path, said array having associated propagation vectors of scattered portions of the acoustic wave which are not substantially perpendicular to the incident acoustic wave over the array, said path being distinct from a segment parallel and adjacent to a side of a rectangular region of a small solid angle section of a sphere.
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Specification