Antenna coil

• US 7,295,168 B2
• Filed: 05/13/2005
• Issued: 11/13/2007
• Est. Priority Date: 05/20/2004
• Status: Expired due to Fees

• Current Assignee: Yonezawa Electric Wire Company Limited (Fujikura Limited)
• Original Assignee: Yonezawa Electric Wire Company Limited (Fujikura Limited)
• Inventors: Ochi, Takayuki, Saegusa, Seiichiro, Nakaya, Hitoki, Seino, Shigeyoshi
• Primary Examiner(s): Dinh; Trinh Vo
• Application Number:
  US11/129,017
• Publication Number:
  US 20050270249A1
• Time in Patent Office: 914 Days
• Field of Search: 343/878, 343/866, 343/867, 296/00
• US Class Current: 343/788
• CPC Class Codes: H01Q 11/08 Helical antennas
• 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: H01Q 7/08 Ferrite rod or like elongated core

Abstract

An antenna coil has a simple structure and a high sensitivity and can be thinner. The antenna coil includes an X Y coil unit having an X axis coil and a Y axis coil wound around a core, a Z axis coil wound around the X Y coil unit, and a resin portion insert molded around the X Y coil unit and the Z axis coil. In the antenna coil, the X axis coil, the Y axis coil, and the Z axis coil are arranged so that the three coils have an axis in a direction orthogonal to each other, and the X Y coil unit and the Z axis are integrated by the resin portion.

Claims

1. An antenna coil comprising:

an X Y coil unit having an X axis coil and a Y axis coil wound around a core;

a Z coil having a hollow portion and wound around the X Y coil unit, wherein the X Y coil unit is held in the hollow portion of the Z axis coil and spaced apart from the Z axis coil; and

a resin portion which is insert-molded to surround and enclose both the X Y coil unit and the Z axis coil for integrating the X Y coil unit and the Z axis coil;

wherein the X axis coil, the Y axis coil, and the Z axis coil are arranged so that the-three coils each has an axis in a direction orthogonal to each other.

2. The antenna coil as recited in claim 1, further comprising electrodes connected to each terminal of the three coils and fixed by being insert molded on the resin portion wherein a portion of each electrode is exposed outside the resin portion.

3. The antenna coil as recited in claim 1, wherein the Z axis coil is fixed in the resin portion to the X Y coil unit by an adhesive.

4. The antenna coil as recited in claim 2, wherein the Z axis coil is fixed in the resin portion to the X Y coil unit by an adhesive.