SEGMENTED WAVEGUIDE CORE TOUCH SENSOR SYSTEMS AND METHODS
First Claim
1. An acoustic touch apparatus, comprising:
- a substrate configured to propagate surface acoustic waves, the substrate having;
a front surface;
a back surface; and
a reflective array configured to redirect at least a portion of the surface acoustic waves, comprising;
a major reflective array including reflector elements, wherein the major reflective array defines a major width dimension; and
a waveguide reflective array including waveguide reflector elements, wherein;
the waveguide reflective array defines a waveguide width dimension that is smaller than the major width dimension;
at least one of the waveguide reflector elements is disposed between two of the reflector elements;
the waveguide reflective array defines a waveguide centerline; and
the waveguide reflective array is positioned relative to the major reflective array such that the waveguide centerline is within a center third of the major width dimension.
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Accused Products
Abstract
Systems and related methods providing for touch sensors having a waveguide reflective array within a major reflective array are discussed herein. A touch sensor may include a substrate configured to propagate surface acoustic waves. The substrate may include a front surface, a back surface including the reflective arrays, and a connecting surface joining the front surface and the back surface. The reflective arrays may be configured to cause the surface acoustic waves to propagate from the back surface, via the connecting surface, to the front surface. The touch censor may further include circuitry configured to determine a coordinate of a touch event on the front surface based on received attenuations in the surface acoustic waves.
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Citations
20 Claims
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1. An acoustic touch apparatus, comprising:
a substrate configured to propagate surface acoustic waves, the substrate having; a front surface; a back surface; and a reflective array configured to redirect at least a portion of the surface acoustic waves, comprising; a major reflective array including reflector elements, wherein the major reflective array defines a major width dimension; and a waveguide reflective array including waveguide reflector elements, wherein; the waveguide reflective array defines a waveguide width dimension that is smaller than the major width dimension; at least one of the waveguide reflector elements is disposed between two of the reflector elements; the waveguide reflective array defines a waveguide centerline; and the waveguide reflective array is positioned relative to the major reflective array such that the waveguide centerline is within a center third of the major width dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for manufacturing an acoustic touch apparatus, comprising:
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providing a substrate configured to propagate surface acoustic waves, the substrate having; a front surface; a back surface; and a connecting surface joining the front surface and the back surface; positioning a mask including open spaces to the back surface of the substrate, wherein the open spaces define a reflective array including a major reflective array and a waveguide reflective array, wherein; the major reflective array includes reflective elements; the major reflective array defines a major width dimension; the waveguide reflective array includes waveguide reflector elements; the waveguide reflective array defines a waveguide width dimension that is smaller than the major width dimension; at least one of the waveguide reflectors element is disposed between two of the reflector elements; the waveguide reflective array defines a waveguide centerline; and the waveguide reflective array is positioned relative to the major reflective array such that the waveguide centerline is within a center third of the major width dimension; applying an acoustically reflective material to the substrate such that the acoustically reflective material is disposed on the back surface in the open spaces; and curing the substrate including the acoustically reflective material. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An acoustic touch apparatus prepared by a process, comprising:
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providing a substrate configured to propagate surface acoustic waves, the substrate having; a front surface; a back surface; and a connecting surface joining the front surface and the back surface; positioning a mask including open spaces to the back surface of the substrate, wherein the open spaces define a reflective array including a major reflective array and a waveguide reflective array, wherein; the major reflective array includes reflective elements; the major reflective array defines a major width dimension; the waveguide reflective array includes waveguide reflector elements; the waveguide reflective array defines a waveguide width dimension that is smaller than the major width dimension; at least one of the waveguide reflector elements is disposed between two of the major reflector elements; the waveguide reflective array defines a waveguide centerline; and the waveguide reflective array is positioned relative to the major reflective array such that the waveguide centerline is within a center third of the major width dimension; applying an acoustically reflective material to the substrate such that the glass frit is disposed on the back surface in the open spaces; and curing the substrate including the acoustically reflective material.
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Specification