公开(公告)号：US20160313122A1

公开(公告)日：2016-10-27

申请号：US14838075

申请日：2015-08-27

Applicant: Apple Inc.

Inventor： Manoj K Bhattacharyya ,  Christopher E. Balcells ,  Jian Guo ,  Peter G. Hartwell

IPC: G01C17/02 ,  G01R33/00 ,  G01R35/00 ,  G01R33/09

CPC classification number: G01C17/02 ,  G01R33/0011 ,  G01R33/093 ,  G01R35/005

Abstract: An electronic device may be provided with an electronic compass. The electronic compass may include magnetic sensors. The magnetic sensors may include thin-film magnetic sensor elements such as giant magnetoresistance sensor elements. Magnetic flux concentrators may be used to guide magnetic fields through the sensor elements. To reduce offset in the electronic compass, the magnetic flux concentrators may be demagnetized by applying a current to a coil in the housing. The coil may be formed from loops of metal traces within a printed circuit or other loops of conductive paths. Magnetic flux concentrators may have ring shapes. A ring-shaped magnetic flux concentrator may be formed from multiple thin stacked layers of soft magnetic material separated by non-magnetic material.

Abstract translation: 电子设备可以设置有电子罗盘。 电子罗盘可以包括磁性传感器。 磁传感器可以包括诸如巨磁阻传感器元件的薄膜磁传感器元件。 磁通集中器可用于引导磁场穿过传感器元件。 为了减少电子罗盘中的偏移，可以通过向壳体中的线圈施加电流来使磁通量集中器退磁。 线圈可以由印刷电路中的金属迹线或其它导电路径环形成。 磁通集中器可以具有环形。 可以由由非磁性材料分离的多个软磁材料层叠形成环形磁通集中器。

公开(公告)号：US09752877B2

公开(公告)日：2017-09-05

申请号：US14838075

申请日：2015-08-27

Applicant: Apple Inc.

Inventor： Manoj K Bhattacharyya ,  Christopher E. Balcells ,  Jian Guo ,  Peter G. Hartwell

IPC: G01C17/02 ,  G01R33/09 ,  G01R33/00 ,  G01R35/00

CPC classification number: G01C17/02 ,  G01R33/0011 ,  G01R33/093 ,  G01R35/005

Abstract: An electronic device may be provided with an electronic compass. The electronic compass may include magnetic sensors. The magnetic sensors may include thin-film magnetic sensor elements such as giant magnetoresistance sensor elements. Magnetic flux concentrators may be used to guide magnetic fields through the sensor elements. To reduce offset in the electronic compass, the magnetic flux concentrators may be demagnetized by applying a current to a coil in the housing. The coil may be formed from loops of metal traces within a printed circuit or other loops of conductive paths. Magnetic flux concentrators may have ring shapes. A ring-shaped magnetic flux concentrator may be formed from multiple thin stacked layers of soft magnetic material separated by non-magnetic material.

公开(公告)号：US11313935B2

公开(公告)日：2022-04-26

申请号：US16793994

申请日：2020-02-18

Applicant: Apple Inc.

Inventor： Gunes Dervisoglu ,  Christopher D. Guichet ,  Adam S. Howell ,  Alexander J. Wiens ,  Christopher E. Balcells ,  Erik L. Wang ,  Jonathan M. Beard ,  Tang Y. Tan ,  Theodore Lao ,  Tyler S. Bushnell ,  Hung A. Pham

IPC: G01R35/00 ,  G01R33/02 ,  G01R33/00

Abstract: A method for calibrating a magnetometer of an electronic device can include detecting a change in a magnetism of the electronic device, collecting a first magnetic field data from the magnetometer at sampling frequency of at least 1 hertz, generating an elliptical calibration model based at least partially on the collected first magnetic field data, collecting a second magnetic field data from the magnetometer, and fitting the collected second magnetic field data to a sphere using the elliptical calibration model.

公开(公告)号：US20210072335A1

公开(公告)日：2021-03-11

申请号：US16793994

申请日：2020-02-18

Applicant: Apple Inc.

Inventor： Gunes Dervisoglu ,  Christopher D. Guichet ,  Adam S. Howell ,  Alexander J. Wiens ,  Christopher E. Balcells ,  Erik L. Wang ,  Jonathan M. Beard ,  Tang Y. Tan ,  Theodore Lao ,  Tyler S. Bushnell ,  Hung A. Pham

IPC: G01R35/00 ,  G01R33/00 ,  G01R33/02

Abstract: A method for calibrating a magnetometer of an electronic device can include detecting a change in a magnetism of the electronic device, collecting a first magnetic field data from the magnetometer at sampling frequency of at least 1 hertz, generating an elliptical calibration model based at least partially on the collected first magnetic field data, collecting a second magnetic field data from the magnetometer, and fitting the collected second magnetic field data to a sphere using the elliptical calibration model.