Wireless power transmission antenna apparatus

• US 9,698,606 B2
• Filed: 07/04/2012
• Issued: 07/04/2017
• 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:
  US14/412,570
• Publication Number:
  US 20150137613A1
• Time in Patent Office: 1,826 Days
• Field of Search: None
• 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 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• 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 50/12 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; a plurality of plate-like members (21, 22, 23, 24), each containing metal and disposed in surroundings of the antenna coil and in a radial direction of the antenna coil; and a housing case (30) containing metal and configured to accommodate therein the antenna coil and the plurality of plate-like members. 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;

a plurality of plate-like members, each containing metal and disposed in surroundings of the antenna coil and in a radial direction of the antenna coil; and

a housing case containing metal and configured to accommodate therein the antenna coil and the plurality of plate-like members,

wherein

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

each of the plurality of plate-like members extends radially from 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-like members directly contacts adjacent ones of the plurality of plate-like members in the air core of the antenna coil.

3. The wireless power transmission antenna apparatus according to claim 1, wherein each of the plurality of plate-like members is arranged to suppress an electric field generated in the surroundings of the antenna coil in operation of said wireless power transmission antenna apparatus.

4. The wireless power transmission antenna apparatus according to claim 1, comprising six of the plurality of plate-like members extending radially from the air core of the antenna coil.

5. The wireless power transmission antenna apparatus according to claim 1, wherein each of the plurality of plate-like members extending radially from the air core of the antenna coil has a cut-out portion through which the antenna coil extends without touching the respective one of the plurality of plate-like members.

6. The wireless power transmission antenna apparatus according to claim 1, wherein each of the plurality of plate-like members does not directly contact adjacent ones of the plurality of plate-like members.

7. A wireless power transmission antenna apparatus comprising:

an antenna coil obtained by winding a conductive member;

a plurality of plate-like members, each containing metal and disposed to extend from a part of an air core of the antenna coil to a direction of the conductive member; and

a housing case containing metal and configured to accommodate therein the antenna coil and the plurality of plate-like members, wherein

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

each of the plurality of plate-like members extends radially from an air core of the antenna coil.

8. The wireless power transmission antenna apparatus according to claim 7, wherein each of the plurality of plate-like members directly contacts adjacent ones of the plurality of plate-like members in the air core of the antenna coil.

9. The wireless power transmission antenna apparatus according to claim 7, wherein each of the plurality of plate-like members is arranged to suppress an electric field generated in the surroundings of the antenna coil in operation of said wireless power transmission antenna apparatus.

10. The wireless power transmission antenna apparatus according to claim 7, comprising six of the plurality of plate-like members extending radially from the air core of the antenna coil.

11. The wireless power transmission antenna apparatus according to claim 7, wherein each of the plurality of plate-like members extending radially from the air core of the antenna coil has a cut-out portion through which the antenna coil extends without touching the respective one of the plurality of plate-like members.

12. The wireless power transmission antenna apparatus according to claim 7, wherein each of the plurality of plate-like members does not directly contact adjacent ones of the plurality of plate-like members.