Coil element

• US 4,393,364 A
• Filed: 09/08/1981
• Issued: 07/12/1983
• Est. Priority Date: 09/19/1980
• Status: Expired due to Term

• Current Assignee: TDK Corporation
• Original Assignee: TDK Electronics (TDK Corporation)
• Inventors: Yasuda, Koichi, Suda, Takayuki
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US06/300,456
• Time in Patent Office: 672 Days
• Field of Search: 336/82, 336/83, 336/177, 336/221, 336/212, 336/65, 336/192, 368/72, 368/73, 368/109, 368/250, 368/255, 368/259, 368/260
• US Class Current: 336/65
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00

Abstract

A coil element formed from a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of the drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of the magnetic members connected to the ends of the coil.

Claims

1. A coil element comprising a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of said drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of said magnetic members connected to the ends of said coil.

2. A coil element as in claim 1, in which each magnetic member is of a cross-sectional shape that is arcuate.

3. A coil element as in claim 2, in which there are two of said magnetic members each of arcuate length less than a half-circle.

4. A coil element as in claim 2 or 3, in which the radius of curvature of the arc of each of said magnetic members is slightly less than that of said drum-shaped ferrite core.