Biometric scanner having a protective conductive array
A biometric scanner having a sensor and an array of conductive strands is disclosed. The sensor has at least one sensor electrode, and that sensor electrode may be a capacitance sensor, an electric field sensor, or an electroluminescent sensor. The array may have an electrical insulating material between adjacent ones of the conductive strands. The array serves to protect the sensor, and conduct through the array information about the electrical characteristics of a biometric object.
1. A biometric scanner, comprising:
first means for sensing an electrical characteristic, the electrical characteristic being one of capacitance, electric field, or electroluminescence, the first means having at least one sensor electrode and a dielectric; and
second means for covering and protecting the at least one sensor electrode and the dielectric from a biometric object to be scanned and allowing an electrical connection between the biometric object and the first means to occur, the second means comprising an array of conductive strands having electrically insulating cladding material between adjacent ones of the conductive strands,
the dielectric being disposed between the at least one sensor electrode and the array of conductive strands to electrically insulate the at least one sensor electrode from the array of conductive strands.
2. The biometric scanner of claim 1 , wherein the array has a first primary surface and a second primary surface, the first primary surface being positioned further from the first means than the second primary surface, and wherein each conductive strand has a longitudinal dimension along which electricity can be conducted from one of the first and second primary surfaces of the array to the other of the first and second primary surfaces of the array.
3. The biometric scanner of claim 1 , wherein the first means has a plurality of sensor electrodes, and the conductive strands are arranged to have a first pitch smaller than a second pitch of the sensor electrodes.
4. The biometric scanner of claim 3 , wherein the first pitch is not greater than half of the second pitch.
5. A method for biometric scanning comprising:
providing a sensor configured to sense at least one of a capacitance, an electric field, or an electroluminescence, the sensor having at least one sensor electrode and a dielectric; and
providing an array of conductive strands positioned to cover and protect the at least one sensor electrode and the dielectric from a biometric object to be scanned and also allow an electrical connection between the biometric object and the sensor to occur, the array having electrically insulating cladding material between adjacent ones of the conductive strands,
the dielectric being disposed between the at least one sensor electrode and the array of conductive strands to electrically insulate the at least one sensor electrode from the array of conductive strands.
6. The method of claim 5 , wherein the array has a first primary surface and a second primary surface, the first primary surface being positioned further from the sensor than the second primary surface, and wherein each conductive strand has a longitudinal dimension along which electricity can be conducted from one of the first and second primary surfaces of the array to the other of the first and second primary surfaces of the array.
7. The method of claim 5 , wherein the sensor has a plurality of sensor electrodes, and the conductive strands are arranged to have a first pitch smaller than a second pitch of the sensor electrodes.
8. The method of claim 7 , wherein the first pitch is not greater than half of the second pitch.
9. A method for biometric scanning comprising:
scanning a biometric object; and
sensing, based on the scanning, at least one of a capacitance, an electric field, or an electroluminescence using:
a sensor having at least one sensor electrode and a dielectric, and
an array of conductive strands positioned to cover and protect the at least one sensor electrode and the dielectric from the biometric object and also allow an electrical connection between the biometric object and the sensor to occur, the array having electrically insulating cladding material between adjacent ones of the conductive strands, the dielectric being disposed between the at least one sensor electrode and the array of conductive strands to electrically insulate the at least one sensor electrode from the array of conductive strands.
10. The method of claim 9 , wherein the array has a first primary surface and a second primary surface, the first primary surface being positioned further from the sensor than the second primary surface, and wherein each conductive strand has a longitudinal dimension along which electricity can be conducted from one of the first and second primary surfaces of the array to the other of the first and second primary surfaces of the array.
11. The method of claim 9 , wherein the sensor has a plurality of sensor electrodes, and the conductive strands are arranged to have a first pitch smaller than a second pitch of the sensor electrodes.
12. The method of claim 11 , wherein the first pitch is not greater than half of the second pitch.