Surface sensor
First Claim
1. A smart card comprising:
- a card body having a recess formed therein; and
a sensor unit mounted in the recess and configured to detect features of a surface of an object contacting the sensor unit, the sensor unit comprising;
a contact surface exposed at an external surface of the card body;
a substrate comprising a dielectric material and having a first surface and a second surface opposite the first surface;
a dielectric layer covering the first surface of the substrate;
a plurality of electrodes mounted on or embedded in the first surface of the substrate;
a plurality of conductive paths;
wherein each conductive path of the plurality of conductive paths extends from a different one of the electrodes and at least partially through the substrate;
a circuit board having a first surface and a second surface opposite the first surface, wherein the substrate and the dielectric layer are mounted directly or indirectly on the first surface of the circuit board, wherein the circuit board comprises conductor leads extending through the circuit board, and each of the conductive paths is electrically connected with a corresponding one of the conductor leads via direct electrical contact, indirect electrical contact through another conductor, or capacitive coupling; and
at least one processor mounted on the second surface of the circuit board, wherein the circuit board is configured to provide an electrical connection between the conductive paths and the at least one processor via the conductor leads extending through the circuit board, wherein the at least one processor is configured to detect a voltage or current at the electrodes via the conductive paths and conductor leads.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a sensor for detection of properties and structures of an organic tissue and its surface, e.g., a fingerprint sensor comprising a chosen number of sensor electrodes at chosen positions for coupling to a finger tissue and its surface having a size less or comparable to the size of the structures, characteristics or properties of the finger tissue or surface, and a processing unit including electronic circuitry connected to said electrodes for detection of the voltage at, or the current flow in the electrodes, thereby providing for detection and collection of information of related capacitance, impedance, electromagnetic field, fingerprint, tissue aliveness or other biometric, physical, physiological, thermal or optical or characteristics or properties of the tissue or its surface positioned over the electrodes, the processing unit being mounted on one side of a substrate and the electrodes being embedded in said substrate, the substrate including through going first, second and third conductive paths between said sensor electrodes and said measurement circuitry. The substrate is made from a polymer material such as Polyimide, implemented as a rigid or a flexible multi layer build-up substrate, said first, second, and third conductive paths are constituted by through going substrate sections of a chosen size and material.
94 Citations
12 Claims
-
1. A smart card comprising:
-
a card body having a recess formed therein; and a sensor unit mounted in the recess and configured to detect features of a surface of an object contacting the sensor unit, the sensor unit comprising; a contact surface exposed at an external surface of the card body; a substrate comprising a dielectric material and having a first surface and a second surface opposite the first surface; a dielectric layer covering the first surface of the substrate; a plurality of electrodes mounted on or embedded in the first surface of the substrate; a plurality of conductive paths; wherein each conductive path of the plurality of conductive paths extends from a different one of the electrodes and at least partially through the substrate; a circuit board having a first surface and a second surface opposite the first surface, wherein the substrate and the dielectric layer are mounted directly or indirectly on the first surface of the circuit board, wherein the circuit board comprises conductor leads extending through the circuit board, and each of the conductive paths is electrically connected with a corresponding one of the conductor leads via direct electrical contact, indirect electrical contact through another conductor, or capacitive coupling; and at least one processor mounted on the second surface of the circuit board, wherein the circuit board is configured to provide an electrical connection between the conductive paths and the at least one processor via the conductor leads extending through the circuit board, wherein the at least one processor is configured to detect a voltage or current at the electrodes via the conductive paths and conductor leads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification