SOFT MAGNETIC SHEET, MODULE INCLUDING THE SHEET AND NON-CONTACT POWER TRANSMISSION SYSTEM INCLUDING THE MODULE

• US 20100007215A1
• Filed: 07/08/2009
• Published: 01/14/2010
• Est. Priority Date: 07/10/2008
• Status: Abandoned Application

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Tokin Corporation (Yageo Corporation)
• Inventors: Sakuma, Sadakatsu
• Application Number:
  US12/499,215
• Publication Number:
  US 20100007215A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 2003/106 Magnetic circuits using combinations of different magnetic materials
• 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

Abstract

A non-contact power transmission system comprises a power receiver and a power transmitter. The power transmitter includes a transmitter coil. The power receiver includes a module which comprises a coil sheet and a soft magnetic sheet stacked on the coil sheet. The coil sheet includes a receiver coil. Electric power is transmitted from the transmitter coil to the receiver coil. The soft magnetic sheet comprises a pair of insulation films and a soft magnetic member hermetically interposed between the insulation films.

Claims

1. A soft magnetic sheet comprising:

a pair of insulation films; and

a soft magnetic member fixed between the insulation films.

2. The soft magnetic sheet according to claim 1, wherein the soft magnetic member is hermetically interposed between the insulation films.

3. The soft magnetic sheet according to claim 1, wherein the soft magnetic member comprises two or more soft magnetic pieces.

4. The soft magnetic sheet according to claim 3, wherein the soft magnetic pieces are arranged in one layer.

5. The soft magnetic sheet according to claim 3, wherein the soft magnetic pieces are arranged in two or more layers, each of layers comprising two or more of the soft magnetic pieces.

6. The soft magnetic sheet according to claim 5, wherein the soft magnetic pieces belonging to one of the layers are equal in number to the soft magnetic pieces belonging to another one of the layers.

7. The soft magnetic sheet according to claim 3, wherein the soft magnetic pieces are grouped into at least two groups, the groups being made of materials different from each other.

8. The soft magnetic sheet according to claim 1, wherein the soft magnetic member comprises two or more soft magnetic plates which are stacked each other.

9. The soft magnetic sheet according to claim 8, wherein the soft magnetic plates are grouped into at least two groups, the groups being made of materials different from each other.

10. The soft magnetic sheet according to claim 2, including a center section which does not contain the soft magnetic member at which the insulation films are directly fixed to each other.

11. A module comprising the soft magnetic sheet according to claim 1 and a coil sheet stacked on the soft magnetic sheet, the coil sheet comprising a coil.

12. The module according to claim 11, wherein the coil sheet is a laminate structure comprising two films and the coil hermetically interposed therebetween.

13. The module according to claim 11, wherein the soft magnetic sheet including a mount portion and a surrounding portion, the coil being positioned on the mount portion, the surrounding portion having a thickness larger than another thickness of the mount portion.

14. A non-contact power transmission system comprising a power receiver and a power transmitter, the power receiver comprising the module according to claim 11.

15. The non-contact power transmission system according to claim 14, wherein:

the power receiver comprises a receiver housing;

the power transmitter comprises a transmitter housing;

one of the receiver housing and the transmitter housing is provided with a protuberant portion, while a remaining one of the receiver housing and the transmitter housing is provided with a depression portion; and

the protuberant portion is fit with the depression portion when the power transmitter transmits power to the power receiver.

16. The non-contact power transmission system according to claim 15, wherein the coil of the module serves as a receiver coil of the power receiver;

the power transmitter includes a transmitter coil;

the receiver coil and the transmitter coil are arranged to surround the protuberant portion and the depression portion.