Acoustic touch position sensor using a low-loss transparent substrate
First Claim
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1. In a touch sensor comprising:
- a substrate capable of propagating acoustic waves along a plurality of acoustic paths and having at least one touch-sensitive surface, a touch on said surface causing a perturbation of said acoustic waves;
at least one transmitting transducer coupled to said substrate for producing acoustic waves therein; and
means coupled to said substrate for sensing a touch-induced perturbation of said acoustic waves;
wherein Rayleigh waves are propagated along at least a portion of said acoustic paths;
the improvement wherein a touch-induced pertubation of Rayleigh waves is sensed by said sensing means and said substrate is made of a glass selected from the group consisting of a borosilicate glass and a barium-containing glass.
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Abstract
A touch position sensor or "touchscreen" utilizes acoustic waves within a sensor substrate to determine the position of touch. The substrate is made of a transparent material, such as borosilicate glass or a barium glass, which exhibits substantially less acoustic absorption than soda-lime glass.
63 Citations
45 Claims
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1. In a touch sensor comprising:
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a substrate capable of propagating acoustic waves along a plurality of acoustic paths and having at least one touch-sensitive surface, a touch on said surface causing a perturbation of said acoustic waves; at least one transmitting transducer coupled to said substrate for producing acoustic waves therein; and means coupled to said substrate for sensing a touch-induced perturbation of said acoustic waves; wherein Rayleigh waves are propagated along at least a portion of said acoustic paths; the improvement wherein a touch-induced pertubation of Rayleigh waves is sensed by said sensing means and said substrate is made of a glass selected from the group consisting of a borosilicate glass and a barium-containing glass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification