摘要:
The invention relates to a smart card (47) comprising: the card body having a recess formed therein; and a sensor unit (21) mounted in the recess and configured to detect features of a surface of an object (10) contacting the sensor unit, the sensor unit comprising: a contact surface (9) exposed at an external surface of the sensor unit; a first dielectric layer (39) constituting said contact surface and covering a second dielectric layer (40) and having a first surface and a second surface opposite the first surface; a plurality of electrodes (1,2,3) mounted on or embedded in the first surface of the second dielectric layer (40); a plurality of conductive paths (4,5,6), at least one conductive path of the plurality of conductive paths extending from each of the electrodes (1,2,3) and at least partially through the second dielectric layer (40); a circuit board having a first surface (41) and a second surface (42) opposite the first surface, wherein the second dielectric layer (40) is mounted directly or indirectly on the first surface of the circuit board; and at least one processor (13) mounted on the second surface of the circuit board, wherein the circuit board is configured to provide an electrical connection between the conductive paths (4,5,6) and the at least one processor (13), wherein the at least one processor is configured to detect a voltage or current at the electrodes via the conductive paths (4,5,6).
摘要:
A method and apparatus for electrical detection of a finger print has a reduced number of interconnect signals between a sensor area and a substrate and an electronic circuit for excitation and detection of the finger print compared to a single-chip finger print sensor. The individual signals are connected internally at the sensor substrate in such a way that the response from the individual sensor elements can be separated from each other. Cross-talk is reduced by keeping the sensor outputs at a constant potential, thus eliminating the effect of capacitive coupling between different sensor outputs and also between sensor outputs and a ground or reference potential.
摘要:
A method and apparatus for electrical detection of a finger print has a reduced number of interconnect signals between a sensor area and a substrate and an electronic circuit for excitation and detection of the finger print compared to a single-chip finger print sensor. The individual signals are connected internally at the sensor substrate in such a way that the response from the individual sensor elements can be separated from each other. Cross-talk is reduced by keeping the sensor outputs at a constant potential, thus eliminating the effect of capacitive coupling between different sensor outputs and also between sensor outputs and a ground or reference potential.
摘要:
Sensor device for performing measurements on an at least partially conductive surface, the sensor comprising a number of conductive structures at or directly below the sensor surface, said conductive structures consisting of at least one stimulation or current sink electrode 1 and a number of sensor elements 3 coupled to interrogation electrodes in an electronic circuit for measuring impedance between the electrodes 3 and said at least one stimulus electrode 1, the sensor device also comprising at least one additional clamping electrode being positioned in the vicinity of said sensor elements and being coupled to a chosen voltage.
摘要:
The invention relates to a smart card (47) comprising: the card body having a recess formed therein; and a sensor unit (21) mounted in the recess and configured to detect features of a surface of an object (10) contacting the sensor unit, the sensor unit comprising: a contact surface (9) exposed at an external surface of the sensor unit; a first dielectric layer (39) constituting said contact surface and covering a second dielectric layer (40) and having a first surface and a second surface opposite the first surface; a plurality of electrodes (1,2,3) mounted on or embedded in the first surface of the second dielectric layer (40); a plurality of conductive paths (4,5,6), at least one conductive path of the plurality of conductive paths extending from each of the electrodes (1,2,3) and at least partially through the second dielectric layer (40); a circuit board having a first surface (41) and a second surface (42) opposite the first surface, wherein the second dielectric layer (40) is mounted directly or indirectly on the first surface of the circuit board; and at least one processor (13) mounted on the second surface of the circuit board, wherein the circuit board is configured to provide an electrical connection between the conductive paths (4,5,6) and the at least one processor (13), wherein the at least one processor is configured to detect a voltage or current at the electrodes via the conductive paths (4,5,6).
摘要:
Sensor device for performing measurements on an at least partially conductive surface, the sensor comprising a number of conductive structures at or directly below the sensor surface, said conductive structures consisting of at least one stimulation or current sink electrode 1 and a number of sensor elements 3 coupled to interrogation electrodes in an electronic circuit for measuring impedance between the electrodes 3 and said at least one stimulus electrode 1, the sensor device also comprising at least one additional clamping electrode being positioned in the vicinity of said sensor elements and being coupled to a chosen voltage.
摘要:
Method and sensor assembly determining the condition of a structure, especially for confirming if a measured fingerprint is on a live finger, by measuring characteristics of close to the structure surface, the sensor comprising a first pair of current supply electrodes coupled to a current source, providing an electrical current to the skin, at least two pickup electrodes at chosen and different positions relative to the current supply electrodes, at least a first of said pickup electrodes being coupled to an instrument for measuring the voltage between said first pickup electrode and at least one of the pickup or current supply electrodes, storage means for a predetermined set of values characterizing a certain condition of the surface, and means for comparing the characteristics from each pickup electrode with the measurements of the other pickup electrodes and with the predetermined set of characteristics for determining the surface condition.
摘要:
The invention relates to a smart card (47) comprising: the card body having a recess formed therein; and a sensor unit (21) mounted in the recess and configured to detect features of a surface of an object (10) contacting the sensor unit, the sensor unit comprising: a contact surface (9) exposed at an external surface of the sensor unit; a first dielectric layer (39) constituting said contact surface and covering a second dielectric layer (40) and having a first surface and a second surface opposite the first surface; a plurality of electrodes (1,2,3) mounted on or embedded in the first surface of the second dielectric layer (40); a plurality of conductive paths (4,5,6), at least one conductive path of the plurality of conductive paths extending from each of the electrodes (1,2,3) and at least partially through the second dielectric layer (40); a circuit board having a first surface (41) and a second surface (42) opposite the first surface, wherein the second dielectric layer (40) is mounted directly or indirectly on the first surface of the circuit board; and at least one processor (13) mounted on the second surface of the circuit board, wherein the circuit board is configured to provide an electrical connection between the conductive paths (4,5,6) and the at least one processor (13), wherein the at least one processor is configured to detect a voltage or current at the electrodes via the conductive paths (4,5,6).
摘要:
A fingerprint sensor and fingerprint sensor system especially for integration in a device having an overlay made of an insulating material comprises a plurality of sensing elements positioned on a first side of the overlay; a plurality of probes positioned in a predetermined pattern defining a fingerprint sensing area on a second side of the overlay, the plurality of probes extending from the first side of the overlay at least partially through the overlay; a plurality of conductor leads on the first side of the overlay interconnecting the plurality of probes with the plurality of sensing elements; a plurality of amplifiers connected to the plurality of sensing elements, the number of amplifiers being less than the number of sensing elements; and an activation circuit connected to the plurality of sensing elements, the activation circuit being adapted to output at least one activation signal.