Back to results
US 2003/0164820 A1Published application
Acoustic condition sensor employing a plurality of mutually non-orthogonal waves
AssigneeElo TouchSystems, Inc.
InventorJoel Kent
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeElo TouchSystems, Inc.
InventorJoel Kent
Estimating the term…
A touch sensor comprising an acoustic wave transmissive medium having a surface; a plurality of acoustic wave path forming systems, each generating a set of incrementally varying paths through said transmissive medium; and a receiver, receiving signals representing said sets of waves, a portion of each set overlapping temporally or physically by propagating in said transmissive medium along axes which are not orthogonal. The waves may also be of differing wave modes. The receiver system may include a phase, waveform or amplitude sensitive system. Reflective arrays are associated with said medium situated along a path, said path not being a linear segment parallel to a coordinate axis of a substrate in a Cartesian space, a segment parallel to an axial axis or perpendicular to a radial axis of a substrate in a cylindrical space nor parallel and adjacent to a side of a rectangular region of a small solid angle section of a sphere; situated along a path substantially not corresponding to a desired coordinate axis of a touch position output signal; situated along a path substantially non-parallel to an edge of said medium; has a spacing of elements in said array which differs, over at least one portion thereof, from an integral multiple of a wavelength of an incident acoustic wave; has elements in said array which are non-parallel; has an angle of acceptance of acoustic waves which varies over regions of said array; and/or coherently scatter at least two distinguishable acoustic waves which are received by said receiving system.
A touch sensor comprising:
A touch sensor comprising:
A touch sensor comprising:
A touch sensor comprising:
A control for determining a position of a touch on a surface by means of sets of acoustic waves having incrementally varying paths, portions of at least two of said sets of waves being received simultaneously at an electroacoustic transducer, comprising a phase sensitive circuit, retaining phase information of said portions of at least two of said sets of waves.
A control for determining a position of a touch on a surface by means of a set of acoustic waves having incrementally varying paths, receiving signals corresponding to said set of acoustic waves, said control being capable of sensing a perturbing influence by detecting an increase in a signal amplitude.
A control for determining a position of a touch on a surface by means of sets of acoustic waves having incrementally varying paths, portions of at least two of said sets of waves being perturbed by a touch, comprising a transform processor for producing an output representative of a position along a single axis based on information derived from each of said sets of waves.
A substrate for an acoustic touch sensor system comprising:
A control for determining a position of a touch on a surface by means of sets of acoustic waves having incrementally varying paths, portions of at least two of said sets of waves being perturbed by a touch, comprising a processor for determining a positional consistency of information derived from each of said sets of waves.
A control for determining a position of a touch on a surface by means of sets of acoustic waves having incrementally varying paths, at least two of said sets of waves differing in frequency or wave propagation mode, comprising a processor for determining a characteristic of a touch based on said sets of waves.
A touch sensor comprising:
Dependencies are inferred from the claim text.