Antenna coil

• US 7,095,381 B2
• Filed: 01/12/2005
• Issued: 08/22/2006
• Est. Priority Date: 04/06/2004
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Alpha Corporation, TOKO Incorporated (Murata Manufacturing Co Limited)
• Inventors: Sato, Junichi, Kimura, Satoru, Uchida, Hidehito
• Primary Examiner(s): Nguyen, Hoang V.
• Assistant Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US11/034,911
• Publication Number:
  US 20050219139A1
• Time in Patent Office: 587 Days
• Field of Search: 343/788, 343/787, 343/713, 343/742, 343/702, 343/867
• US Class Current: 343/788
• CPC Class Codes: H01Q 1/3241 particular used in keyless entry systems
• CPC Class Codes: H01Q 1/40 Radiating elements coated with or embedded in protective material
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core

Abstract

An antenna coil includes a bar-shaped core, a bobbin, a coil, a case, and a wiring harness. The bobbin is formed of insulating material and has the coil wound around the bobbin with the bar-shaped core within the bobbin. The case is formed of insulating material defining a cavity having a cavity interior wall. The bobbin with the coil wound therearound is disposed in the cavity. The case has a protrusion extending into the cavity. The wiring harness is connected to the coil and disposed around a portion of a perimeter of the protrusion in a substantially omega shape and is disposed at least in part between the protrusion and the cavity interior wall. A flexible resin fills spaces in the cavity between the bobbin and the cavity interior wall.

Claims

1. An antenna coil comprising:

a bar-shaped core;

a bobbin formed of insulating material and having opposing first and second ends, opposing longitudinal sides extending between said first and second ends and defining a side opening of a recess therebetween, said opposing longitudinal sides defining a winding accepting groove, and said bar-shaped core being disposed in said recess;

a coil wound around said bobbin and said bar-shaped core within said winding accepting groove;

a case formed of insulating material defining a cavity having a cavity interior wall, said bobbin with said coil wound therearound being disposed in said cavity;

a tuning condenser connected to said coil and situated proximate said first end;

said case having a protrusion extending into said cavity;

a wiring harness connected to said tuning condenser and extending exterior of said case, said wiring harness being disposed around a portion of a perimeter of said protrusion in a substantially omega shape, said wiring harness being disposed at least in part between said protrusion and said cavity interior wall; and

a flexible resin filing spaces in said cavity between said bobbin and said cavity interior wall.