Magnetic Sensor Device, Method of Manufacturing the Sensor Device, and Rotational Operation Mechanism
US-2024247932-A1 · Jul 25, 2024 · US
Magnetic sensor
US2025271515A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025271515-A1 |
| Application number | US-202519050189-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 11, 2025 |
| Priority date | Feb 28, 2024 |
| Publication date | Aug 28, 2025 |
| Grant date | — |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
Disclosed herein is a magnetic sensor that includes sensor chip having a magnetosensitive element, first and compensation coils configured to generate a canceling magnetic field based on an output signal from the magnetosensitive element, a first switch connected in series to the first compensation coil, a control circuit configured to periodically turn on/off the first switch, and a detection circuit configured to detect a compensation current flowing through the second compensation coil.
First claim
Opening claim text (preview).
What is claimed is: 1 . A magnetic sensor comprising: a sensor chip having a magnetosensitive element; first and second compensation coils configured to generate a canceling magnetic field based on an output signal from the magnetosensitive element; a first switch connected in series to the first compensation coil; a control circuit configured to periodically turn on/off the first switch; and a detection circuit configured to detect a compensation current flowing through the second compensation coil. 2 . The magnetic sensor as claimed in claim 1 , wherein a distance between the second compensation coil and the magnetosensitive element is smaller than a distance between the first compensation coil and the magnetosensitive element. 3 . The magnetic sensor as claimed in claim 1 , further comprising a first magnetic field collecting body collecting a magnetic field to the magnetosensitive element, wherein the first compensation coil is wound around the first magnetic field collecting body. 4 . The magnetic sensor as claimed in claim 3 , wherein the second compensation coil is integrated in the sensor chip. 5 . The magnetic sensor as claimed in claim 2 , further comprising a second magnetic field collecting body collecting a magnetic field to the magnetosensitive element, wherein the sensor chip is disposed between the first and second magnetic field collecting bodies, and wherein the second compensation coil is wound around the second magnetic field collecting body. 6 . The magnetic sensor as claimed in claim 1 , further comprising a second switch connected in series to the second compensation coil, wherein the control circuit is configured to turn on the second switch while the first switch is turned off and turn off the second switch while the first switch is turned on.
Assignees
Inventors
Classifications
Geometrical arrangement of magnetic sensor elements; Apparatus combining different magnetic sensor types (G01R33/0206 takes precedence) · CPC title
- G01R33/09Primary
Magnetoresistive devices · CPC title
using feed-back or modulation techniques · CPC title
comprising means, e.g. flux concentrators, flux guides, for guiding or concentrating the magnetic flux, e.g. to the magnetic sensor · CPC title
- G01R33/0017Primary
Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields · CPC title
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- What does patent US2025271515A1 cover?
- Disclosed herein is a magnetic sensor that includes sensor chip having a magnetosensitive element, first and compensation coils configured to generate a canceling magnetic field based on an output signal from the magnetosensitive element, a first switch connected in series to the first compensation coil, a control circuit configured to periodically turn on/off the first switch, and a detection …
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification G01R33/09. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Aug 28 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).