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US 5,708,461 AGranted
Acoustic touch position sensor using a low-loss transparent substrate
AssigneeElo TouchSystems, Inc.
InventorJoel Kent
Life of this patent
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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.
Claims45
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.
3 more elements
Dependencies are inferred from the claim text.