Touch panel for an acoustic touch position sensor
First Claim
1. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:
- a touch substrate capable of supporting shear waves for propagation therein;
a back plate; and
a substantially nonshear wave coupling adhesive disposed between said substrate and said back plate, said adhesive bonding said touch substrate to said back plate and substantially preventing shear waves propagating in said touch substrate from being coupled to said back plate.
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0 Petitions
Accused Products
Abstract
An acoustic touch position sensor is shown in which a transducer coupled to a side of a substrate imparts a shear wave into the substrate for propagation along a first axis. A reflective array disposed along the first axis reflects portions of the shear wave along a plurality of parallel paths extending across a touch surface of the substrate to a second reflective array the axis of which is parallel to the first axis. The second reflective array reflects the shear waves incident thereto a receiving transducer mounted on the side of the substrate. A touch on the substrate results in perturbation in the shear wave which is sensed to determine the axial position of the touch on the substrate. A laminated touch panel is provided such that a back plate of any desired thickness is bounded onto the substrate. A non-shear wave coupling adhesive may be used to bond the back plate to the substrate. Alternatively, the back plate may be chosen such that the velocity at which acoustic waves propagate in the back plate is greater than the velocity at which acoustic waves propagate in the substrate.
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Citations
34 Claims
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1. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:
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a touch substrate capable of supporting shear waves for propagation therein; a back plate; and a substantially nonshear wave coupling adhesive disposed between said substrate and said back plate, said adhesive bonding said touch substrate to said back plate and substantially preventing shear waves propagating in said touch substrate from being coupled to said back plate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel comprising;
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a touch substrate capable of supporting shear waves for propagation therein, said substrate having an associated velocity at which acoustic waves propagate therein; and a back plate secured to said touch substrate, said back plate having an associated velocity at which acoustic waves propagate therein, the velocity of waves traveling in said back plate being greater than the velocity of waves traveling in said touch substrate. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel comprising:
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a touch substrate capable of supporting shear waves for propagation therein; and at least one array of reflective elements disposed along an axis of said touch substrate, each element of said array being positioned at an approximately 45°
angle with respect to said axis and the number of reflective elements intersecting a line extending perpendicular to said axis across the width of said array being equal to or greater than 14. - View Dependent Claims (15)
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16. A touch panel for use in a touch position sensor having one transducer for transmitting and receiving shear waves, said transducer being mounted on said touch panel to transmit a shear wave of a given wavelength for propagation in said touch panel in a first detection along an axis of said touch panel and to receive a shear wave propagating along said axis in a second direction opposite said first direction, said touch panel comprising:
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a touch substrate capable of supporting shear waves for propagation therein; and at least one array of reflective elements disposed along an axis of said substrate, each reflective element being positioned at an approximately 45°
angle with respect to said array axis, said substrate having a first edge for mounting said transducer adjacent to a first end of said array and said substrate having a second edge adjacent to a second end of said array opposite said first array end, said second substrate edge being reflective and at an approximately 45°
angle with respect to said array axis. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave for propagation therein, comprising:
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a touch substrate capable of supporting shear waves for propagation therein; at least one top array of reflective elements disposed on a top surface of said substrate along an axis, each element of said array being positioned at an approximately 45°
angle with respect to said array axis; andat least one bottom array of reflective elements disposed on a bottom surface of said substrate along said axis, the reflective elements of said bottom array being vertically aligned with the reflective elements of said top array.
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24. A touch panel for use in a touch position sensor having a first transducer mounted on said touch panel to impart a shear wave for propagation along a first axis and having a second transducer mounted on said touch panel to impart a shear wave for propagation along a second axis substantially perpendicular to said first axis therein comprising:
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a touch substrate capable of supporting shear waves for propagation therein; a top array of reflective elements disposed on a top surface of said substrate along said first axis, each element of said array being positioned at an approximately 45°
angle with respect to said first axis; anda bottom array of reflective elements disposed on a bottom surface of said substrate along said second axis, each element of said array being positioned at an approximately 45°
angle with respect to said second axis. - View Dependent Claims (25, 26, 27)
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28. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave for propagation therein, comprising:
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a touch substrate capable of supporting shear waves for propagation therein; at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45°
angle with respect to said array axis; anda spurious wave absorbing material disposed on a top surface and a bottom surface of said substrate parallel to the length of said array. - View Dependent Claims (29, 30)
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31. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:
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a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave; at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45°
angle with respect to said array axis; andthe number of reflective elements intersecting a line extending perpendicular to said array axis across the width of said array is equal to or greater than 14.
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32. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:
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a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave; at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45°
angle with respect to said array axis; andmeans disposed on said substrate parallel to said array for suppressing spurious acoustic waves.
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33. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:
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a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave; at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45°
angle with respect to said array axis; anda spurious wave absorbing material disposed adjacent to the length of said array on a top surface and a bottom surface of said touch substrate to suppress spurious waves propagating in said substrate.
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34. A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:
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a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave; at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45°
angle with respect to said array axis, said array being disposed adjacent a first edge of said substrate; anda spurious wave absorbing material disposed on a top surface and a bottom surface of said substrate parallel to the length of said array adjacent to a second edge of said substrate opposite said first edge.
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Specification