Electronic device including coil antenna and magnet

Patent metadata

Field	Value
Publication number	US-12355270-B2
Application number	US-202217883614-A
Country	US
Kind code	B2
Filing date	Aug 9, 2022
Priority date	Aug 25, 2021
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A power reception device includes: a housing including a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface; a coil antenna wound in a circle; a shielding sheet disposed over the coil antenna; and a first magnet and a second magnet adjacent to an outermost coil of the coil antenna and disposed to be spaced apart from the outermost coil. The first magnet is disposed so that a portion of magnetism induced by the first magnet is formed in the first direction. The second magnet is disposed so that a portion of the magnetism induced by the second magnet is formed in a third direction that is an outside direction from a center of the coil antenna.

First claim

The invention claimed is:

1. A power reception device comprising:
a housing comprising a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface;
a coil antenna disposed in an internal space of the housing, configured to wirelessly receive power from a power transmission device, and wound in a circle;
a shielding sheet disposed over the coil antenna; and
a first magnet and a second magnet adjacent to an outermost coil of the coil antenna and disposed to be spaced apart from the outermost coil,
wherein the first magnet is disposed so that a portion of magnetism induced by the first magnet is formed in the first direction, and
the second magnet is coupled with the first magnet in a third direction that is an outside direction from a center of the coil antenna and is disposed so that a portion of the magnetism induced by the second magnet is formed in the third direction.

2. The power reception device of claim 1 ,
wherein the first magnet is provided in plural,
wherein the second magnet is provided in plural, and
wherein a slit is formed between adjacent second magnets of the plurality of second magnets.

3. The power reception device of claim 2 , wherein based on the power transmission device being attached to the power reception device, the coil antenna of the power reception device and a coil antenna of the power transmission device are disposed in a way to be aligned with each other due to coupling between the plurality of first magnets and plurality of second magnets of the power reception device and a plurality of third magnets and plurality of fourth magnets of the power transmission device.

4. The power reception device of claim 1 , wherein the second magnet has a rectangular shape or a trapezoidal shape.

5. The power reception device of claim 1 , wherein the second magnet is disposed so that the portion of the magnetism induced by the second magnet is formed in a fourth direction that is a direction between the second direction and the third direction.

6. The power reception device of claim 1 , further comprising a third magnet coupled with the second magnet and disposed so that a portion of the magnetism induced by the third magnet is formed in the second direction.

7. The power reception device of claim 1 ,
wherein the second magnet is disposed to be spaced apart from the first magnet at a designated distance in the third direction, and
wherein the first magnet and the second magnet have a non-magnetized zone therebetween.

8. The power reception device of claim 1 , further comprising at least one shielding material disposed on one surface of the first magnet and/or the second magnet and for guiding the magnetism.

9. The power reception device of claim 8 , wherein as the at least one shielding material for guiding the magnetism is disposed on the one surface of the first magnet and/or the second magnet so that the magnetism is prevented from being induced in an outside direction of the power reception device.

10. The power reception device of claim 8 , wherein the at least one shielding material is formed of a steel plate.

11. A power transmission device comprising:
a housing comprising a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface;
a coil antenna disposed in an internal space of the housing, configured to wirelessly transmit power to a power reception device, and wound in a circle;
a shielding sheet disposed under the coil antenna; and
a first magnet and a second magnet adjacent to an outermost coil of the coil antenna and disposed to be spaced apart from the outermost coil,
wherein the first magnet is disposed so that a portion of magnetism induced by the first magnet is formed in the first direction, and
the second magnet is coupled with the first magnet in a third direction that is an outside direction from a center of the coil antenna and is disposed so that a portion of the magnetism induced by the second magnet is formed in a fourth direction that is opposite to the third direction.

12. The power transmission device of claim 11 ,
wherein the first magnet is provided in plural,
wherein the second magnet is provided in plural, and
wherein a slit is formed between adjacent second magnets of the plurality of second magnets.

13. The power transmission device of claim 12 , wherein based on the power reception device being attached to the power transmission device, the coil antenna of the power transmission device and a coil antenna of the power reception device are disposed in a way to be aligned with each other due to coupling between the plurality of first magnets and plurality of second magnets of the power transmission device and a plurality of third magnets and plurality of fourth magnets of the power reception device.

14. The power transmission device of claim 11 , wherein the second magnet has a rectangular shape or a trapezoidal shape.

15. The power transmission device of claim 11 , wherein the second magnet is disposed so that the portion of the magnetism induced by the second magnet is formed in a fifth direction that is a direction between the second direction and the fourth direction.

16. The power transmission device of claim 11 , further comprising a third magnet coupled with the second magnet and disposed so that a portion of the magnetism induced by the third magnet is formed in the second direction.

17. The power transmission device of claim 11 ,
wherein the second magnet is disposed to be spaced apart from the first magnet at a designated distance in the third direction, and
wherein the first magnet and the second magnet have a non-magnetized zone therebetween.

18. The power transmission device of claim 11 , further comprising at least one shielding material disposed on one surface of the first magnet and/or the second magnet and for guiding the magnetism.

19. The power transmission device of claim 18 , wherein as the at least one shielding material for guiding the magnetism is disposed on the one surface of the first magnet and/or the second magnet so that the magnetism is prevented from being induced in an outside direction of the power transmission device.

20. The power transmission device of claim 18 , wherein the at least one shielding material is formed of a steel plate.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lim Jaedeok
• Park Hyein
• You Jaehyoung
• Lee Woosup
• Lim Taejun
• Cho Gyuyeong
• Choe Hana

Classifications

• H02J50/005 Primary

  Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices · CPC title

• H01F27/288

  Shielding · CPC title

• H02J50/10

  using inductive coupling · CPC title

• H01F27/361

  made of combinations of electrically conductive material and ferromagnetic material · CPC title

• H02J50/27

  characterised by the type of receiving antennas, e.g. rectennas · CPC title