公开(公告)号：WO2021046354A2

公开(公告)日：2021-03-11

申请号：PCT/US2020/049411

申请日：2020-09-04

Applicant: LEXMARK INTERNATIONAL, INC.

Inventor： ELLIS, James Howard, Jr. ,  HARDIN, Keith Bryan

IPC: G01R3/00 ,  G01R33/07 ,  G01R33/0023 ,  G01R33/0052 ,  G01R33/0094 ,  G01R33/072 ,  G01R33/1276 ,  G06K7/082 ,  G06K9/00013 ,  G06K9/00577 ,  G06K9/6215 ,  H04L2209/12 ,  H04L9/0866 ,  H04L9/3278

Abstract: A magnetic sensor array device is described that is constructed with multiple single sensor die, diced out of a wafer as a group and packaged in a wafer level package (WLP). The device comprises an array of multi-axis magnetic sensors that can measure the multi-dimensional magnetic field of an arbitrary sized two-dimensional region with high spatial resolution, reduced sensing distance, higher measurement throughput, tolerance to motion, improved temperature measurement, and improved yield when placed on a circuit card comprises part of an authentication system including a physical unclonable function ("PUT"), a substrate, a plurality of magnetized particles randomly dispersed in the substrate, and a PUT reader constructed using one or more of the magnetic sensor array devices wherein the PUT reader measures the magnetic field at multiple locations in close proximity to the magnetized particles. The measured magnetic field data may be compared to previously enrolled data to assess authenticity.

公开(公告)号：WO2022192682A2

公开(公告)日：2022-09-15

申请号：PCT/US2022/019970

申请日：2022-03-11

Applicant: TRUSTEES OF BOSTON UNIVERSITY

Inventor： BISHOP, David ,  JAVOR, Joshua ,  CAMPBELL, David ,  IMBODEN, Matthias

IPC: G01R33/022 ,  G01R33/02 ,  G01R33/028 ,  G01R33/032 ,  G01R33/038 ,  G01V7/10 ,  G01R33/0052 ,  G01R33/0286 ,  G01R33/0385

Abstract: A gradiometer includes a at least one magnet attached to a beam. The magnet moves in response to a magnetic force. A sensing element is configured to measure movement or deflection of the beam or magnet. The gradiometer is configured to determine a gradient of a magnetic field acting on the first magnet based on movement of the magnet. The gradiometer can further measure higher order gradients.

公开(公告)号：WO2021055178A2

公开(公告)日：2021-03-25

申请号：PCT/US2020/049418

申请日：2020-09-04

Applicant: LEXMARK INTERNATIONAL, INC.

Inventor： ELLIS, James Howard, Jr. ,  HARDIN, Keith Bryan

IPC: G01R33/00 ,  G01R33/06 ,  G01R33/12 ,  H01L21/00 ,  H01L27/00 ,  H04L9/32 ,  G01R33/0023 ,  G01R33/0052 ,  G01R33/0082 ,  G01R33/0094 ,  G01R33/0206 ,  G01R33/072 ,  G06F21/57 ,  G06F21/73 ,  G06F21/75

Abstract: A magnetic sensor array device is described that is constructed with multiple sensors integrated on a common silicon die, diced and packaged in a wafer level package (WLP). The device comprises an array of multi-axis magnetic sensors that can measure the multi-dimensional magnetic field of an arbitrary sized two-dimensional region with high spatial resolution, reduced sensing distance, higher measurement throughput, tolerance to motion, improved temperature measurement, and improved yield when placed on a circuit card comprises part of an authentication system including a physical unclonable function ("PUF"), a substrate, a plurality of magnetized particles randomly dispersed in the substrate, and a PUF reader constructed using one or more of the magnetic sensor array devices wherein the PUF reader measures the magnetic field at multiple locations in close proximity to the magnetized particles. The measured magnetic field data may be compared to previously enrolled data to assess authenticity.

公开(公告)号：WO2021061240A2

公开(公告)日：2021-04-01

申请号：PCT/US2020/039027

申请日：2020-06-22

Applicant: CARNEGIE MELLON UNIVERSITY

Inventor： HELLEBREKERS, Tess ,  MAJIDI, Carmel

IPC: G01R33/02 ,  G01L1/12 ,  G01B7/24 ,  G01D5/12 ,  G01P13/00 ,  G01R33/0029 ,  G01R33/0052 ,  G01R33/0094 ,  G01R33/0206

Abstract: A soft magnetic sensor comprising a soft material containing randomly distributed magnetic microparticles and a magnetometer that can estimate force and localize contact over a continuous area. A reference magnetometer can be used to filter motion and ambient noise. Methods for locating contact and determining force comprise data analysis of the magnetometer output. In some embodiments, the sensor can localize an object prior to contact.