SURFACE SENSOR

摘要

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.

主权项

1. A smart card comprising:
a card body; and a sensor unit mounted in a recess formed in the card body 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 and adapted to enable physical contact with the object;a substrate comprising a dielectric material and having a first surface and a second surface on a side of the substrate opposite the first surface;a dielectric layer covering the first surface of the substrate;a set of first electrodes mounted on or embedded in the first surface of the substrate;a set of second electrodes mounted on or embedded in the first surface of the substrate;a set of first conductive paths, at least one first conductive path of the set of first conductive paths extending from each of the first electrodes and at least partially through the substrate;a set of second conductive paths, at least one second conductive path of the set of second conductive paths extending from each of the second electrodes and at least partially through the substrate;a circuit board having a first surface and a second surface opposite the first surface, the substrate and the dielectric layer being mounted directly or indirectly on the first surface of the circuit board; andat 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 first conductive paths and the at least one processor and between the second conductive paths and the at least one processor, wherein the at least one processor is configured to detect a voltage or current at the first electrodes via the first conductive paths and at the second electrodes via the second conductive paths.