Wireless power transmission antenna apparatus

• US 9,672,978 B2
• Filed: 07/04/2012
• Issued: 06/06/2017
• Est. Priority Date: 07/04/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Pioneer Corporation
• Inventors: Fujieda, Tomoyuki
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): BUKHARI, AQEEL H
• Application Number:
  US14/412,707
• Publication Number:
  US 20150162129A1
• Time in Patent Office: 1,798 Days
• Field of Search: None
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/363 made of electrically conductive 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: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H02J 50/005 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 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

Abstract

A wireless power transmission antenna apparatus (100, 200) is mounted on a wireless power transmitting apparatus configured to transmit electric power in a wireless manner, and is provided with: an antenna coil (10) obtained by winding a conductive member; and a plate-like member (21, 22, 23, 24) containing metal, disposed in surroundings of the antenna coil and in a radial direction of the antenna coil. The plate-like member is disposed such that a plate face thereof crosses a direction of extension of the conductive member. According to the wireless power transmission antenna apparatus, it is possible to improve power transmission efficiency while complying with radio wave protection guidelines.

Claims

1. A wireless power transmission antenna apparatus comprising:

an antenna coil obtained by winding a conductive member; and

a plurality of plate members containing metal, disposed in surroundings of the antenna coil and in a radial direction of the antenna coil, wherein

a plate face of each of the plurality of plate members crosses a direction of extension of the conductive member, and

the plurality of plate members are arranged radially from a part of an air core of the antenna coil.

2. The wireless power transmission antenna apparatus according to claim 1, wherein each of the plurality of plate members is disposed to be in contact with a part of adjacent plate members.

3. The wireless power transmission antenna apparatus according to claim 1, wherein each of the plurality of plate members has a function of suppressing an electric field generated in the surroundings of the antenna coil in operation of said wireless power transmission antenna apparatus.

7. The wireless power transmission antenna apparatus according to claim 1, wherein the conductive member is wound to form a spiral, helical, figure-eight shaped, or annular current path.

8. The wireless power transmission antenna apparatus according to claim 1, wherein each of the plate members is not in contact with the antenna coil.

4. A wireless power transmission antenna apparatus comprising:

an antenna coil obtained by winding a conductive member; and

a plurality of plate members containing metal, disposed to extend from a part of an air core of the antenna coil to a direction of the conductive member, wherein

an extension face of a plate face of each of the plurality of plate members crosses a direction of extension of the conductive member, and

the plurality of plate members are arranged radially from a part of the air core of the antenna coil.

5. The wireless power transmission antenna apparatus according to claim 4, wherein each of the plurality of plate members is disposed to be in contact with a part of adjacent plate members.

6. The wireless power transmission antenna apparatus according to claim 4, wherein each of the plurality of plate members has a function of suppressing an electric field generated in the surroundings of the antenna coil in operation of said wireless power transmission antenna apparatus.

9. The wireless power transmission antenna apparatus according to claim 4, wherein the conductive member is wound to form a spiral, helical, figure-eight shaped, or annular current path.

10. The wireless power transmission antenna apparatus according to claim 4, wherein each of the plate members is not in contact with the antenna coil.