Soft magnetic alloy and shielding sheet for antenna comprising the same

Patent metadata

Field	Value
Publication number	US-2016138140-A1
Application number	US-201514940629-A
Country	US
Kind code	A1
Filing date	Nov 13, 2015
Priority date	Nov 13, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A soft magnetic alloy according to an embodiment of the present invention has a composition of the following Chemical formula:
Fe 100-a-b Si a Cr b   [Chemical Formula]
where a is in a range of 1 to 7 at %, b is in a range of 3.5 to 17 at % and a+b is in a range of 10.5 to 18 at %.

First claim

What is claimed is:

1 . A soft magnetic alloy having a composition of the following Chemical Formula:
Fe 100-a-b Si a Cr b   [Chemical Formula]
where a is in a range of 1 to 7 at %, b is in a range of 3.5 to 17 at %, and a+b is in a range of 10.5 to 18 at %.

2 . The soft magnetic alloy of claim 1 , wherein a is in a range of 5 to 7 at % and b is in a range of 3.5 to 11 at %.

3 . The soft magnetic alloy of claim 1 , wherein a is in a range of 1 to 5 at % and b is in a range of 11 to 17 at %.

4 . The soft magnetic alloy of claim 1 , wherein a saturation magnetic flux density is in a range of 1.4 to 1.9 T and, resistivity is equal to or more than 60 μΩ·cm.

5 . The soft magnetic alloy of claim 4 , wherein a saturation magnetic flux density is in a range of 1.6 T to 1.9 T.

6 . The soft magnetic alloy of claim 1 , comprising a plate-shaped powder having a particle diameter of 30 to 120 μm and a thickness of 0.3 to 1.5 μm.

7 . A shielding sheet for an antenna comprising a soft magnetic alloy having a composition of the following Chemical Formula:
Fe 100-a-b Si a Cr b   [Chemical Formula]
where a is in a range of 1 to 7 at %, b is in a range of 3.5 to 17 at % and a+b is in a range of 10.5 to 18 at %.

8 . The shielding sheet of claim 7 , wherein a is in a range of 5 to 7 at % and b is in a range of 3.5 to 11 at %.

9 . The shielding sheet of claim 7 , wherein a is in a range of 1 to 5 at % and b is in a range of 11 to 17 at %.

10 . The shielding sheet of claim 7 , wherein a saturation magnetic flux density is in a range of 1.4 to 1.9 T and resistivity is equal to or more than 60 μΩ·cm.

11 . The shielding sheet of claim 7 , further comprising a binder.

12 . The shielding sheet of claim 11 , wherein the binder is selected from the group consisting of a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, and a radiation curable resin.

13 . The shielding sheet of claim 11 , wherein the binder is selected from the group consisting of an epoxy resin, a silicone resin, a silicone rubber, a phenol resin, a urea resin, a melamine resin, and a poly vinyl alcohol (PVA) resin.

14 . A wireless power transmitter of a wireless charging system, comprising:
a soft magnetic core; and a transmitter coil formed on the soft magnetic core, wherein the soft magnetic core includes a soft magnetic alloy having a composition of the following Chemical Formula:
Fe 100-a-b Si a Cr b   [Chemical Formula]

where a is in a range of 1 to 7 at %, b is in a range of 3.5 to 17 at % and a+b is in a range of 10.5 to 18 at %.

15 . The wireless power transmitter of claim 14 , wherein a is in a range of 5 to 7 at % and b is in a range of 3.5 to 11 at %.

16 . The wireless power transmitter of claim 14 , wherein a is in a range of 1 to 5 at % and b is in a range of 11 to 17 at %.

17 . A wireless power receiver of a wireless charging system, comprising:
a soft magnetic sheet; and a receiver coil formed on the soft magnetic sheet, wherein the soft magnetic sheet includes a soft magnetic alloy having a composition of the following Chemical Formula:
Fe 100-a-b Si a Cr b   [Chemical Formula]

where a is in a range of 1 to 7 at %, b is in a range of 3.5 to 17 at % and a+b is in a range of 10.5 to 18 at %.

18 . The wireless power receiver of claim 17 , wherein a is in a range of 5 to 7 at % and b is in a range of 3.5 to 11 at %.

19 . The wireless power receiver of claim 17 , wherein a is in a range of 1 to 5 at % and b is in a range of 11 to 17 at %.

Assignees

• Lg Innotek Co Ltd

Inventors

• Bae Seok
• Song Ji Yeon
• Moon Won Ha
• Lee Sang Won
• Lee Jong Hyuk
• Hyun Soon Young

Classifications

• C22C38/34 Primary

  with more than 1.5% by weight of silicon · CPC title

• H01F1/26

  by macromolecular organic substances · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01Q1/526

  Electromagnetic shields · CPC title

• C22C38/02

  containing silicon · CPC title