Acoustic touch position sensor using a low acoustic loss transparent substrate
First Claim
1. A touch panel provided with a glass substrate as a propagation medium for Rayleigh waves and which is used for detecting the coordinate data on a touching position, wherein the composition of the glass substrate comprises SiO2 as the main component, comprises additional components that prevent said SiO2 from forming a regular crystalline lattice by disruption of Si—
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Si covalent links, and wherein said added components provide sufficiently strong alternate links through strong ionic bonding, alternate covalent bonding, or steric constraints to produce an attenuation coefficient of less than or equal to about 0.5 dB/cm as determined at the substrate surface for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5-inch wide wedge transducers mounted on a sample of the glass type under test having sufficient thickness to support Rayleigh wave propagation.
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Accused Products
Abstract
An acoustic touch panel or “touch screen” utilizes acoustic waves within a sensor substrate to determine the position of touch. The substrate is made of a temperable glass having an attenuation coefficient of less than or equal to about 0.6 dB/cm as determined at the substrate surface for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5-inch wide wedge transducers mounted on a sample of the glass type under test having sufficient thickness to support Rayleigh wave propagation. An acoustic touch panel with a tempered low-acoustic-loss glass substrate. This makes possible large tempered acoustic touch panels.
A glass substrate of the touch sensor comprises SiO2 as the main component with a total content of Na2O, CaO and MgO of 20% by weight or less and a total content of Al2O3, ZrO2, TiO2, B2O3, Y2O3, SnO2, PbO2, In2O3 and K2O of 5% by weight or more.
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Citations
47 Claims
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1. A touch panel provided with a glass substrate as a propagation medium for Rayleigh waves and which is used for detecting the coordinate data on a touching position, wherein the composition of the glass substrate comprises SiO2 as the main component, comprises additional components that prevent said SiO2 from forming a regular crystalline lattice by disruption of Si—
- O—
Si covalent links, and wherein said added components provide sufficiently strong alternate links through strong ionic bonding, alternate covalent bonding, or steric constraints to produce an attenuation coefficient of less than or equal to about 0.5 dB/cm as determined at the substrate surface for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5-inch wide wedge transducers mounted on a sample of the glass type under test having sufficient thickness to support Rayleigh wave propagation.
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- 2. A touch panel provided with a glass substrate as a propagation medium for Rayleigh waves and which is used for detecting the coordinate data on a touching position, wherein the composition of the glass substrate comprises SiO2 as the main component and the total content of Na2O, CaO and MgO in said glass substrate is 20% by weight or less.
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4. A touch panel provided with a glass substrate as a propagation medium for Rayleigh waves and which is used for detecting the coordinate data on a touching position, wherein said glass substrate is comprised of SiO2 as the main component and said glass substrate has a higher light transmission than a soda-lime glass in the visible ray region.
- 5. A touch panel provided with a glass substrate as a propagation medium for Rayleigh waves and which is used for detecting the coordinate data on a touching position, wherein said glass substrate is comprised of SiO2 as the main component, the total content of Na2O, CaO and MgO is 20% by weight or less and the total content of Al2O3, ZrO2, TiO2, B2O3, Y2O3, SnO2, PbO2, In2O3 and K2O is 5% by weight or more, and wherein said substrate comprises a glass having a higher light transmission than a soda-lime glass in the visible ray region.
- 8. In a touch panel system comprising a substrate capable of supporting acoustic waves propagation and means for introducing said waves in said substrate, the improvement comprising said substrate being made of a temperable glass having an attenuation coefficient of less than or equal to about 0.5 dB/cm as determined at the substrate surface for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5-inch wide wedge transducers mounted on a sample of the glass type under test having sufficient thickness to support Rayleigh wave propagation.
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44. In a touch sensor system comprising a substrate capable of supporting acoustic waves propagation and means for introducing said waves in said substrate, the improvement comprising said substrate being made of a chemically hardened barium-containing glass having an attenuation coefficient of less than or equal to about 0.5 dB/cm as determined at the substrate surface for 5.53 MHz Rayleigh waves as measured by the slope of a plot of amplitude versus distance for a signal through a pair of facing 0.5-inch wide wedge transducers mounted on a sample of the glass type under test having sufficient thickness to support Rayleigh wave propagation.
Specification