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 system, method, and computer program product for evaluating a conformance of sets of curves using curvature information from curve segments to identify conforming curve segments. These curve segments are evaluated for relative positional variations in a context of a cluster by triangulating corresponding points among the curve segments of the cluster. Little to no deviation between corresponding lengths in the clusters indicate a high probability of match. Confirmation may be done by a more rigorous pattern matcher based upon the conforming curve segments of a cluster.
摘要:
This invention relates to a fingerprint sensor especially for integration in a unit having a cover material such as glass being transparent in a certain area, the fingerprint sensor comprising a number of electrodes positioned in a predetermined pattern on or close to the surface of said cover material, each electrode being connected to a conductor lead extending through said cover material, the conductor lead being essentially transparent and being routed on the opposite side from the electrodes to a processing unit being positioned outside said transparent area.
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:
This invention relates to a navigation tool for connecting to a display device, comprising at least two sensor elements having known positions relative to each other, each sensor element being coupled to detector means for recording a change in a predetermined parametre and timing means for determining the time of change at each sensor element and calculating means for calculating the direction and speed of the recorded changes based on the relative positions of the sensor elements and the duration between the recorded changes.
摘要:
A sensor has drive lines and transverse pickup lines to define an electrode pair where each pickup line crosses a drive line. A reference pickup line is arranged parallel to the pickup lines and a compensation drive line is arranged parallel to the drive lines. A signal source provides a first signal to the drive lines and a second signal that is the inverse of the first signal to the compensation drive line. An amplifier has a first input connected to a pickup line, a second input connected to a reference pickup line, and a output indicative of an object in contact with the electrode pair(s). Each impedance between the compensation drive line and a pickup line, between the reference pickup line and a reference drive line, and between the compensation drive line and the reference pickup line is equal to the impedance at the electrode pair when no object is contact with the electrode pair.
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:
This invention relates to a pointer tool for connecting to a display device, comprising a number of sensors elements being positioned on a twodimensional surface, for measuring a predetermined parametre at a surface, the measured quantity being sampled at a chosen rate, and calculating means for comparing the measurements from the sensor elements for detection of movements in two dimensions over the elements based on changes in the measured parametre, the time between the changes and the known relative positions between the sensor elements.