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公开(公告)号：US20230184865A1
公开(公告)日：2023-06-15
申请号：US17950748
申请日：2022-09-22
Applicant: Apple Inc.
Inventor： Savas Gider , Jian Guo
CPC classification number: G01R35/005 , G01R33/07 , G01R33/09
Abstract: Embodiments are disclosed for various configurations of a hybrid Hall/MR magnetometer with self-calibration. In an embodiment, a method comprises: a circuit coupled to a magnetometer and configured to determine whether the magnetometer is to operate in a sensing operation mode or a self-calibration operation mode. The magnetometer comprises a Hall sensor and MR sensor coupled to the circuit. In accordance with determining a sensing operation mode, the Hall sensor is turned and the MR sensor is turned on; and an external magnetic field is measured using the MR sensor. The magnetic field measurement is calibrated using a MR sensor bias error determined in a self-calibration operation mode of the sensor.
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公开(公告)号：US11513169B2
公开(公告)日：2022-11-29
申请号：US16376725
申请日：2019-04-05
Applicant: Apple Inc.
Inventor： Savas Gider , Chaitanya Mudivarthi , Joyce M. Mullenix
Abstract: Disclosed is a magnetometer architecture that couples one or more coils to a magnetic yoke to allow the reset of the magnetic yoke and one or more magnetic field sensors simultaneously after, for example, exposure to a large stray magnetic field. Also, disclosed is a magnetometer architecture that integrates separate magnetic pole pieces offset from the yoke that are each wound by a reset coil to allow reset of the one or more magnetic field sensors.
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公开(公告)号：US10914567B2
公开(公告)日：2021-02-09
申请号：US16279588
申请日：2019-02-19
Applicant: Apple Inc.
Inventor： Jian Guo , John Greer Elias , Savas Gider
Abstract: Magnetic sensing technology can be used to detect changes, or disturbances (e.g., changes in magnetic field strength), in magnetic fields and can be used to measure the precise location/positioning of an electronic device in proximity to a magnetic source. In order to avoid interference by earth's static magnetic field, a modulated magnetic field can be used for magnetic based proximity sensing. Received modulated magnetic field signals can be demodulated to determine proximity of the sensor to the source of the modulated magnetic field. Devices such as gloves or devices with fingertip nodes based on receiving modulated magnetic fields can be used to detect user hand position.
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公开(公告)号：US10816612B2
公开(公告)日：2020-10-27
申请号：US15993528
申请日：2018-05-30
Applicant: Apple Inc.
Inventor： Savas Gider , Jian Guo , Chaitanya Mudivarthi
Abstract: Disclosed is a magnetometer architecture that uses a separate shield to minimize cross-axis sensitivity with low impact on main axis sensitivity. In an embodiment, a magnetometer with cross-axis shielding comprises: a ring shield; a magnetic yoke disposed within the ring shield; and one or more magnetic field sensors disposed between the ring shield and the magnetic yoke, the magnetic field sensors positioned relative to the ring shield and the magnetic yoke such that flux induced by a magnetic field is absorbed in a cross-axis direction of the magnetometer.
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15.发明公开公开(公告)号：US20240107892A1
公开(公告)日：2024-03-28
申请号：US17934969
申请日：2022-09-23
Applicant: Apple Inc.
Inventor： Jason Janesky , Jodi M. Iwata-Harms , Savas Gider
CPC classification number: H01L43/08 , G01R33/093 , G11C11/161 , H01F10/3272 , H01L43/10
Abstract: The enclosed embodiments are directed to a magnetoresistance (MR) sensor with a biased free layer for improved stability of magnetic performance. In an embodiment, an MR sensor comprises: a first antiferromagnetic (AF) pinning layer; a magnetic fixed layer disposed on the first AF layer; a tunnel barrier disposed on the magnetic fixed layer; a magnetic coupled free layer disposed on the tunnel barrier; a AF coupling layer disposed on the magnetic coupled free layer; a magnetic pinned layer disposed on the AF coupling layer; and a second AF pinning layer disposed on the magnetic pinned layer. In an embodiment, a method of unpinning a pinned free layer uses a current pulse through the MR sensor to self-heat above a blocking temperature of the AF pinning layer, and then reading the MR sensor after the current pulse is reduced or removed and the MR sensor cools back below the blocking temperature.
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Patent Agency Ranking
公开(公告)号：US11937511B2
公开(公告)日：2024-03-19
申请号：US18109180
申请日：2023-02-13
Applicant: Apple Inc.
Inventor： Majid Khan , Roberto M. Ribeiro , Savas Gider
CPC classification number: H10N30/88 , G01L1/167 , G01L1/183 , G01L9/0055 , G01L19/0092 , G01S3/781 , H10N30/1071 , H10N30/2047 , B81B2201/0264 , B81B2201/032
Abstract: Aspects of the subject disclosure include a pressure-sensing device consisting of a housing including a membrane and one or more piezoresistive elements disposed on the membrane to sense a displacement due to a deflection of the membrane. A first set of electrodes is disposed over the membrane, and a second set of electrodes is disposed on a permeable port of the device at a distance from the membrane. The first and second sets of electrodes form an electrostatic actuator to exert a repulsive force onto the membrane to reduce the deflection of the membrane.
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公开(公告)号：US20230333394A1
公开(公告)日：2023-10-19
申请号：US18180700
申请日：2023-03-08
Applicant: Apple Inc.
Inventor： Yuhao Pan , Guangwu Duan , Jeffrey A. Griffis , John G. Elias , Krishna Prasad Vummidi Murali , Michael A. Lehr , Savas Gider , Stephen E. Dey
IPC: G02B27/01 , G01R33/02 , G06F3/01 , G06F3/0354
CPC classification number: G02B27/0176 , G02B27/0172 , G01R33/0206 , G06F3/014 , G06F3/03545 , G02B2027/0192 , G02B2027/0138
Abstract: A head-mounted device or other electronic device may emit an alternating-current magnetic field. A wireless controller may have alternating-current magnetometers for monitoring the alternating-current field. The wireless controller may also have an accelerometer for measuring the orientation of the controller relative to the Earth's gravity and a direct-current magnetometer for measuring the orientation of the controller relative to the Earth's magnetic field. The alternating-current magnetometers may be three-coil magnetometers located at different locations in a controller housing. Using data from the alternating-current magnetometers, the direct-current magnetometer, the accelerometer, and/or other sensors, the wireless controller can determine the position and orientation of the wireless controller. This information can be wirelessly transmitted to the head-mounted device to control the head-mounted device.
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公开(公告)号：US20230089110A1
公开(公告)日：2023-03-23
申请号：US17992860
申请日：2022-11-22
Applicant: Apple Inc.
Inventor： Savas Gider , Chaitanya Mudivarthi , Joyce M. Mullenix
Abstract: Disclosed is a magnetometer architecture that couples one or more coils to a magnetic yoke to allow the reset of the magnetic yoke and one or more magnetic field sensors simultaneously after, for example, exposure to a large stray magnetic field. Also, disclosed is a magnetometer architecture that integrates separate magnetic pole pieces offset from the yoke that are each wound by a reset coil to allow reset of the one or more magnetic field sensors.
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公开(公告)号：US20230061188A1
公开(公告)日：2023-03-02
申请号：US17461866
申请日：2021-08-30
Applicant: Apple Inc.
Inventor： Gregory B. ARNDT , Majid Khan , Savas Gider
Abstract: Aspects of the subject technology relate to an apparatus including a housing and a substrate. The apparatus further includes a sensor, an integrated circuit mounted on the substrate, and one or more heating elements configured to adjust a temperature of the sensor to facilitate measurement of temperature sensitivity and calibration of the sensor.
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公开(公告)号：US11199425B2
公开(公告)日：2021-12-14
申请号：US16584840
申请日：2019-09-26
Applicant: Apple Inc.
Inventor： Savas Gider , Jian Guo , John Greer Elias
Abstract: Magnetic sensing technology can be used to detect changes, or disturbances (e.g., changes in magnetic field strength), in magnetic fields and can be used to measure the precise location/positioning of an electronic device in proximity to a magnetic source. In order to avoid interference by earth's static magnetic field, a modulated magnetic field can be used for magnetic based proximity sensing. Received modulated magnetic field signals can be demodulated to determine a received magnetic field strength. A drive current of a magnetic transmitter coil can be varied to maintain the detected magnetic field strength at a target value or within a desirable range. The drive current can also be varied to remain below a burnout current level that can cause damage to the transmitter coil.
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