Biometric sensing device with isolated piezo ceramic elements
First Claim
1. A method for sensing biometric information in a digit, comprising:
- piezo electrically sensing the digit via an array of discrete piezo ceramic elements; and
facilitating (i) acoustic attenuation and (ii) electrical isolation between the discrete piezo ceramic elements by distributing a filler therebetween;
wherein the sensing includes producing sonic waves that are transferred from the ceramic elements through a protective layer to ridges of the digit; and
wherein an acoustic impedance of the protective layer substantially matches an acoustic impedance of the digit.
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Abstract
The present invention provides an apparatus for sensing biometric information in a finger with piezo ceramic elements. In one embodiment, the apparatus includes an array of discrete piezo ceramic elements and filler. The array of discrete piezo ceramic elements is responsive to acoustic characteristics of parts of the finger. The filler is distributed between the discrete piezo ceramic elements and provides acoustic attenuation and electric isolation between the discrete piezo ceramic elements. A protective layer can receive a ridge pattern of the finger positioned proximate to the array. Air in valleys between ridges of the ridge pattern of the finger acts as an acoustic barrier. A backing layer (air or foam) can also be provided.
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Citations
14 Claims
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1. A method for sensing biometric information in a digit, comprising:
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piezo electrically sensing the digit via an array of discrete piezo ceramic elements; and facilitating (i) acoustic attenuation and (ii) electrical isolation between the discrete piezo ceramic elements by distributing a filler therebetween; wherein the sensing includes producing sonic waves that are transferred from the ceramic elements through a protective layer to ridges of the digit; and wherein an acoustic impedance of the protective layer substantially matches an acoustic impedance of the digit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification