Sheet for shielding electromagnetic waves for wireless charging and method of manufacturing the same

• US 10,707,013 B2
• Filed: 09/19/2017
• Issued: 07/07/2020
• Est. Priority Date: 01/25/2017
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lee, Seung Min
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Dominique, Emmanuel
• Application Number:
  US15/708,884
• Publication Number:
  US 20180211767A1
• Time in Patent Office: 1,022 Days
• CPC Class Codes: B29B 13/022 Melting the material to be shaped
• CPC Class Codes: B29B 7/90 Fillers or reinforcements , e.g. fibres
• CPC Class Codes: B29C 2045/0015 Non-uniform dispersion of fillers
• CPC Class Codes: B29C 45/0001 characterised by the choice of material
• CPC Class Codes: B29C 45/0013 using fillers dispersed in the moulding material, e.g. metal particles
• CPC Class Codes: B29C 45/0053 combined with a final operation, e.g. shaping injection-compression moulding B29C45/561
• CPC Class Codes: B29K 2105/251 Particles, powder or granules expandable particles B29K2105/046
• CPC Class Codes: B29K 2505/00 Use of metals, their alloys or their compounds, as filler
• CPC Class Codes: B29K 2995/0008 Magnetic or paramagnetic
• CPC Class Codes: B29L 2007/002 Panels; Plates; Sheets
• CPC Class Codes: H01F 27/2885 with shields or electrodes shields or electrodes for pancake coils H01F27/2871; construction of electric or magnetic shields or screens H01F27/36
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

A sheet to shield electromagnetic waves for wireless charging includes: a base part formed of a resin; and a magnetic material embedded in the base part, wherein a density of the magnetic material in a region of the magnetic material corresponding to a shape of a coil of a reception coil member or a transmission coil member and a region of the magnetic material corresponding to an inner side of the coil is higher than a density of the magnetic material in other regions of the magnetic material.

Claims

1. A sheet to shield electromagnetic waves for wireless charging, comprising:

a base part; and

a magnetic material embedded in the base part,

wherein a density of the magnetic material in a region of the magnetic material corresponding to a shape of a coil of a reception coil member or a transmission coil member and a region of the magnetic material corresponding to an inner side of the coil is higher than a density of the magnetic material in other regions of the magnetic material,

wherein the coil comprises a spiral shape, and

wherein a density of the magnetic material in a central region of the magnetic material bounded by a perimeter of a through-hole of the coil is higher than a density of the magnetic material in an outer region of the magnetic material surrounding the central region.

2. The sheet of claim 1, wherein the density of the magnetic material in the region of the magnetic material corresponding to the shape of the coil is higher than a density of the magnetic material in a region of the magnetic material disposed outside the coil.

3. The sheet of claim 1, wherein a density of the magnetic material in a thickness direction of the base part varies in the region of the magnetic material corresponding to the shape of the coil.

4. The sheet of claim 3, wherein a density of the magnetic material in a region of the magnetic material disposed in an upper portion of the base part disposed adjacent to the coil in the thickness direction of the base part is higher than a density of the magnetic material in a region of the magnetic material disposed at a lower portion of the base part.

5. The sheet of claim 1, wherein a density of the magnetic material in a region of the magnetic material corresponding to a region between coil patterns of the coil is lower than a density of the magnetic material in regions of the magnetic material corresponding to the coil patterns.

6. The sheet of claim 1, wherein a disposition shape of the magnetic material is formed based on magnetic fluxes of magnets disposed in a mold at a time of manufacturing the magnetic material.

7. The sheet of claim 1, further comprising an adhesive layer disposed on one surface of the base part.

8. The sheet of claim 1, wherein the magnetic material comprises either one or both of a powder form and a flake form.

9. A wireless power reception apparatus, comprising:

a base part;

a wireless power reception coil; and

a magnetic material embedded in the base part,

wherein a density of the magnetic material in a region of the magnetic material corresponding to a shape of the wireless power reception coil and a region of the magnetic corresponding to an inner side of the wireless power reception coil is higher than a density of the magnetic material in other regions of the magnetic material,

wherein the wireless power reception coil comprises a spiral shape, and

wherein a density of the magnetic material in a central region of the magnetic material bounded by a perimeter of a through-hole of the power reception coil is higher than a density of the magnetic material in an outer region of the magnetic material surrounding the central region.

10. The wireless power reception apparatus of claim 9, wherein the density of the magnetic material in the region of the magnetic material corresponding to the shape of the wireless power reception coil is higher than a density of the magnetic material in a region of the magnetic material disposed outside the wireless power reception coil.

11. The wireless power reception apparatus of claim 9, wherein a density of the magnetic material in a region of the magnetic material disposed in an upper portion of a base part disposed adjacent to the wireless power reception coil in thickness direction of the base part is higher than a density of the magnetic material in a region of the magnetic material disposed at a lower portion of the base part.