Magnetic sensing device for lid

Patent metadata

Field	Value
Publication number	US-12474744-B2
Application number	US-202318182950-A
Country	US
Kind code	B2
Filing date	Mar 13, 2023
Priority date	Jan 17, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

The technology provides for a magnetic sensing device. The device includes a magnetic sensor configured to generate a first output triggered by a first polarity and a second output triggered by a second polarity. The device includes a first magnet, a second magnet, and a third magnet. The device may be configured such that, when the second magnet is not within a predetermined distance from the first magnet, a magnetic field from the first magnet having the first polarity causes the first output and the second output to have a first set of values. The device may be configured such that, when the second magnet is within the predetermined distance from the first magnet, a magnetic field from the third magnet having the second polarity causes the first output and the second output to have a second set of values.

First claim

What is claimed is:

1 . A device, comprising:
a magnetic sensor configured to have a first output and a second output, wherein the first output and the second output of the magnetic sensor are based on a first magnetic field having a first polarity; a first magnet; a second magnet, the second magnet being positioned at an adjustable distance from the first magnet; and a third magnet, the third magnet being positioned at an adjustable distance from the magnetic sensor; wherein:
one or more of a strength of the first magnet, a shape of the first magnet, a facing direction of the first magnet, or a distance between the first magnet and the magnetic sensor is such that, when the second magnet is not within a predetermined distance from the first magnet, the first magnetic field produced by one or both of the first and second magnets is incident on the magnetic sensor and causes the first output to have a first value and the second output to have a second value; and
when the second magnet is within the predetermined distance from the first magnet, a second magnetic field having a second polarity produced by the third magnet and one or both of the first and second magnets causes the first output to have a third value and the second output to have a fourth value.

2 . The device of claim 1 , wherein the first magnet is positioned at a fixed distance from the magnetic sensor.

3 . The device of claim 1 , wherein, when the second magnet is within the predetermined distance from the first magnet, a pole of the first magnet having a first polarity is configured to be facing a pole of the second magnet having a second polarity.

4 . The device of claim 1 , wherein the second magnet is within the predetermined distance from the first magnet, the first magnetic field saturates the magnetic sensor.

5 . The device of claim 1 , wherein:
the magnetic sensor and the first magnet are positioned within a body of a case; the second magnet is positioned within a lid of the case; and one or more processors of the case are configured to determine whether the case is open, closed, or at an intermediary position between open and closed based on the first output and the second output.

6 . The device of claim 1 , wherein:
the magnetic sensor and the first magnet are positioned within a body of a case for housing one or more wireless devices; the second magnet is positioned within the one or more wireless devices; and one or more processors of the case are configured to determine whether the one or more wireless devices are positioned inside the case based on at least one of the first output and the second output.

7 . The device of claim 1 , wherein:
the magnetic sensor and the first magnet are positioned within one or more wireless devices; the second magnet is positioned within a case for housing the one or more wireless devices; and one or more processors of the one or more wireless devices are configured to determine whether the one or more wireless devices are positioned inside the case based on at least one of the first output and the second output.

8 . The device of claim 1 , wherein, when the second magnet is within the predetermined distance from the first magnet, a pole of the third magnet is configured to be facing a sensing surface of the magnetic sensor.

9 . The device of claim 1 , wherein one or more of a strength, facing direction, and shape of the third magnet is such that when the second magnet is within the predetermined distance from the first magnet, the second magnetic field saturates the magnetic sensor.

10 . The device of claim 5 , wherein:
the case includes circuitry for charging an electronic device; and the one or more processors of the case are further configured to determine whether to charge the electronic device based on at least one of the first output and the second output.

11 . A device, comprising:
a magnetic sensor configured to have a first output and a second output, wherein the first output and the second output of the magnetic sensor are based on a first magnetic field having a first polarity; a first magnet; a second magnet, the second magnet being positioned at an adjustable distance from the first magnet; and a third magnet, the third magnet being positioned at an adjustable distance from the magnetic sensor, wherein:
one or more of a strength of the second magnet, a facing direction of the second magnet, a shape of the second magnet, or a distance between the second magnet and the magnetic sensor is such that, when the second magnet is within a predetermined distance from the first magnet, the first magnetic field produced by one or both of the first magnet and the second magnet is incident on the magnetic sensor and causes the first output to have a first value and the second output to have a second value; and
when the second magnet is within the predetermined distance from the first magnet, a second magnetic field having a second polarity produced by the third magnet and one or both of the first and second magnets causes the first output to have a third value and the second output to have a fourth value.

12 . The device of claim 11 , wherein, when the second magnet is within the predetermined distance from the first magnet, the first magnetic field saturates the magnetic sensor.

13 . The device of claim 11 , wherein:
the magnetic sensor and the first magnet are positioned within a body of a case; the second magnet is positioned within a lid of the case; and one or more processors of the case are configured to determine whether the case is open, closed, or in an intermediary position between open and closed based on the first output and the second output.

14 . The device of claim 11 , wherein:
the magnetic sensor and the first magnet are positioned within a body of a case for housing one or more wireless devices; the second magnet is positioned within the one or more wireless devices; and one or more processors of the case are configured to determine whether the one or more wireless devices are positioned inside the case based on at least one of the first output and the second output.

15 . The device of claim 13 , wherein;
the case includes circuitry for charging an electronic device; and the one or more processors of the case are further configured to determine whether to charge the electronic device based on at least one of the first output and the second output.

16 . A case, comprising:
a body; a lid, the lid moveable with respect to the body between an opening and a closing position; a magnetic sensor positioned at the body and configured to have a first output and a second output, wherein the first output and the second output of the magnetic sensor are based on a first magnetic field having a first polarity; a first magnet positioned at the body; and a second magnet positioned at the lid, wherein:
a strength of the first magnet, a facing direction of the first magnet, a shape of the first magnet, or a distance between the first magnet and the magnetic sensor is such that when the second magnet is within a predetermined distance from the first magnet, the first magnetic field having the first polarity produced by one or both of the first magnet and the second magnet is incident on the magnetic sensor and causes the first output to have a first value and the second output to have a second value; and
when the lid is in the closing position, a second magnetic field having a second polarity produced by one or both of the first magnet and the second magnet is incident on the magnetic sensor and c

Assignees

• Google Llc

Inventors

• Ding Yao
• Li Hui

Classifications

• G01R33/072

  Constructional adaptation of the sensor to specific applications · CPC title

• H02J50/10

  using inductive coupling · CPC title

• G06F1/1677 Primary

  for detecting open or closed state or particular intermediate positions assumed by movable parts of the enclosure, e.g. detection of display lid position with respect to main body in a laptop, detection of opening of the cover of battery compartment · CPC title