Pot-core components for planar mounting

• US 5,912,609 A
• Filed: 06/30/1997
• Issued: 06/15/1999
• Est. Priority Date: 07/01/1996
• Status: Expired due to Fees

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Usui, Hideaki, Sato, Kouki
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): MAI, ANH T
• Application Number:
  US08/884,940
• Time in Patent Office: 715 Days
• Field of Search: 336/83, 336/225, 336/192, 336/220, 336/221, 336/180, 336/183
• US Class Current: 336/83
• CPC Class Codes: H01F 17/043 with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
• CPC Class Codes: H01F 27/292 Surface mounted devices

Abstract

A coil component comprises a pot core having through holes formed in the bottom, a coil so shaped as to fit in the pot core, and a cover core joined to the rim of the pot core. The coil has terminals inserted in the through holes to such an extent that their lower ends do not protrude beyond the bottom. The bottom has membrane external electrodes formed on its outersurface and connected with the terminals.

Claims

1. A coil component comprising a pot core having a bottom in which four through holes are formed, a coil retained in the pot core, and a cover core joined to a rim of the pot core, said coil being a shape-retaining coil comprising a pair of windings having four terminals located in the through holes so that the lower ends thereof do not protrude beyond a bottom outer surface of said pot core, a wall of each of said through holes being lined with an internal membrane electrode extending from and integrally formed with external membrane electrodes formed on the bottom outer surface said terminals being located in the through holes with a gap between said terminals and said walls of said through holes, said terminals being connected with the internal and external membrane electrodes by solder filled in the gap between said terminals and said internal electrode membrane.

2. The coil component of claim 1, wherein the through holes of the pot core have a diameter larger than the diameter of the wire forming the coil.

3. The coil component of claim 1, wherein said pot core has a wall surrounding the coil, with at least one gap formed in the joint between the wall and the plate core cover.

4. The coil component of claim 1, wherein said wall of the pot core is thinner around the through holes than in a remainder of said wall of the pot core.

5. The coil component of claim 1, wherein said pair of windings are integrally formed as inner and outer windings, with a plurality of wire layers wound one over another, about an inner post of the core.

6. The coil component of claim 5, wherein said windings having an outer surface coated with an adhesive to join turns of said windings to adjacent turns of said windings.

7. The coil component of claim 1, wherein said cover core is a plate.