Magnetic sheet and non-contact power receiving device, electronic apparatus and non-contact charging system using the same

• US 10,083,785 B2
• Filed: 10/24/2013
• Issued: 09/25/2018
• Est. Priority Date: 04/25/2011
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
• Inventors: Sawa, Takao, Yamada, Katsuhiko, Saito, Tadao
• Primary Examiner(s): Rodas, Richard Isla
• Assistant Examiner(s): Ruiz, Johali Torres
• Application Number:
  US14/062,472
• Publication Number:
  US 20140049212A1
• Time in Patent Office: 1,797 Days
• Field of Search: 320108
• CPC Class Codes: H01F 1/15308 based on Fe/Ni H01F1/15325 takes precedence
• 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00302 Overcharge protection

Abstract

A magnetic sheet 1 of an embodiment includes a stack of a plurality of magnetic thin strips and resin film parts. The stack includes from 5 to 25 pieces of the magnetic thin strips. The magnetic thin strips are provided with cutout portions each having a width of 1 mm or less (including 0 (zero)). A ratio (B/A) of a total length B of the cutout portions provided to the magnetic thin strip to a total outer peripheral length A of an outer peripheral area of the magnetic thin strip arranged on one of the resin film parts is in a range of from 2 to 25.

Claims

1. A non-contact power receiving device magnetic sheet comprising a stack of magnetic thin strips and resin film parts which are stacked in a thickness direction of the non-contact power receiving device magnetic sheet;

wherein the stack includes the magnetic thin strips whose number is from 6 to 25 and the resin film parts alternately stacked with the magnetic thin strips, and the magnetic thin strips are provided with cutout portions each having a width of 1 mm or less;

wherein a ratio (B/A) of a total length B of the cutout portions to a total outer peripheral length A of the magnetic thin strip is in a range of from 6.8 to 25, wherein the total outer peripheral length A is a total length of an outer peripheral area of the magnetic thin strip arranged on one of the resin film parts, and the total length B of the cutout portions is a total length of the cutout portions provided to the magnetic thin strip;

wherein each of the cutout portions is a gap shaped cut-out portion separating one at the magnetic thin strips or is a slit-shaped cutout portion formed in one at the magnetic thin strips, and each of the cutout portions has a liner shape, a curved shape, a zigzag shape, or a cross shape; and

wherein the resin film parts entirely cover peripheral surfaces of the magnetic thin strips so that the magnetic thin strips are not exposed.

2. The non-contact power receiving device magnetic sheet according to claim 1,

wherein the stack includes, as the magnetic thin strip, one or more of amorphous alloy thin strip having a composition represented by a general formula:

Fe_100-a-b-cM_aX_bT_c

 

wherein M is at least one element selected from the group consisting of Ni and Co, T is at least one element selected from the group consisting of Mn, Cr, Ti, Zr, Hf, Mo, V, Nb, W, Ta, Cu, Sn and rare-earth elements, X is at least one element selected from the group consisting of B, Si, C and P, a is a number satisfying 0≤

a≤

25 atom %, b is a number satisfying 10≤

b≤

35 atom %, and c is a number satisfying 0≤

c≤

5 atom %.

3. The non-contact power receiving device magnetic sheet according to claim 1,

wherein the stack includes one or more of the magnetic thin strip having a thickness in a range of from 5 to 30 μ

m.

4. The non-contact power receiving device magnetic sheet according to claim 1,

wherein the stack includes one or more of the magnetic thin strip which is not broken when being subjected to 180°

adhesion bending.

5. The non-contact power receiving device magnetic sheet according to claim 1,

wherein the stack includes one or more of the magnetic thin strip having a saturation magnetostriction constant of 15 ppm or more.

6. The non-contact power receiving device magnetic sheet according to claim 1,

wherein the stack includes one or more of the magnetic thin strip having a saturation magnetic flux density in a range of from 1.2 to 2.1 T.

7. A non-contact power receiving device, comprising:

a power receiving coil having a spiral coil;

a rectifier rectifying an alternating voltage generated in the power receiving coil;

a secondary battery to which a direct-current voltage rectified in the rectifier is charged; and

the non-contact power receiving device magnetic sheet according to claim 1 arranged in at least one of a position between the spiral coil and the secondary battery and a position between the spiral coil and the rectifier.

8. An electronic apparatus, comprising:

a non-contact power receiving device including a power receiving coil having a spiral coil, a rectifier rectifying an alternating voltage generated in the power receiving coil, and a secondary battery to which a direct-current voltage rectified in the rectifier is charged;

an electronic apparatus main body including an electronic device supplied with the direct-current voltage from the secondary battery for operation, and a circuit board on which the electronic device is mounted; and

the non-contact power receiving device magnetic sheet according to claim 1 arranged in at least one of a position between the spiral coil and the secondary battery, a position between the spiral coil and the rectifier, a position between the spiral coil and the electronic device, and a position between the spiral coil and the circuit board.

9. A non-contact charging system, comprising:

the electronic apparatus according to claim 8; and

a power feeding device including a power feeding coil arranged in a non-contact manner with respect to the power receiving coil of the electronic apparatus, a power supply applying an alternating voltage to the power feeding coil, and a magnet for positioning,

wherein the positioning of the electronic apparatus is conducted using the magnet, and then a magnetic flux generated in the power feeding coil is transmitted to the power receiving coil to transmit power in a non-contact manner.

10. The non-contact charging system according to claim 9, wherein the magnet is a Nd—

Fe—

B-based magnet.

11. The non-contact charging system according to claim 9, wherein the non-contact power receiving device magnetic sheet is arranged as at least one of a magnetic shield and an inductor.

12. The magnetic non-contact power receiving device sheet according to claim 1,

wherein the magnetic thin strips which are adjacent through the cutout portion have a contact region.

13. The magnetic non-contact power receiving device sheet according to claim 1,

wherein the stacked number of the magnetic thin strips is from 10 to 25.

14. The magnetic non-contact power receiving device sheet according to claim 1,

wherein the ratio (B/A) is in a range of from 6.8 to 16.8.