Acoustic device using higher order harmonic piezoelectric element
First Claim
Patent Images
1. A touch sensor having an operating frequency, comprising:
- a touch sensitive substrate; and
a piezoelectric element operably coupled to the substrate, wherein the piezoelectric element is characterized by a higher order odd resonant frequency approximately equal to the operating frequency, the higher order frequency being selected from a frequency consisting of a third, fifth, and seventh order resonant frequency.
10 Assignments
0 Petitions
Accused Products
Abstract
An acoustic-based system, such as a touchscreen system, is provided. The system comprises an acoustic substrate and an acoustic transducer operably coupled to the substrate. The transducer exhibits a higher order odd resonant frequency that is equal to the operating frequency of the system. As a result of using the higher resonant frequency that is substantially equal to the operating frequency, the thickness of the transducer can be increased, and thus made more durable.
89 Citations
20 Claims
-
1. A touch sensor having an operating frequency, comprising:
-
a touch sensitive substrate; and a piezoelectric element operably coupled to the substrate, wherein the piezoelectric element is characterized by a higher order odd resonant frequency approximately equal to the operating frequency, the higher order frequency being selected from a frequency consisting of a third, fifth, and seventh order resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of sensing touches on a touch sensor, comprising:
-
transmitting an acoustic wave across an acoustic substrate with a piezoelectric element, the acoustic wave having a frequency approximately equal to a higher order odd resonant frequency of the piezoelectric element, the higher order frequency being selected from a frequency consisting of a third, fifth, and seventh order resonant frequency; receiving the acoustic wave from the substrate; and processing the acoustic wave at the higher order odd resonant frequency to determine whether the substrate has been touched. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification