Wire wound electronic component

• US 6,198,373 B1
• Filed: 08/07/1998
• Issued: 03/06/2001
• Est. Priority Date: 08/19/1997
• Status: Expired due to Term

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: Shiba, Nobuyasu, Uehara, Takayuki, Otsuka, Kazuhiko, Karasawa, Hideyuki, Amada, Yoshihiro, Ogawa, Hideki, Aoba, Hideo
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): Nguyen, Tuyen
• Application Number:
  US09/131,392
• Time in Patent Office: 942 Days
• Field of Search: 336/96, 336/83, 336/90, 336/58, 336/94, 336/200, 296/021
• US Class Current: 336/83
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 27/022 Encapsulation
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/005 Impregnating or encapsulating insulating of windings H01F41/12
• CPC Class Codes: H01F 41/0246 Manufacturing of magnetic circuits by moulding or by pressing powder magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material
• CPC Class Codes: H01F 41/12 Insulating of windings impregnating or encapsulating of transformers H01F41/005 ; of conductors in general H01B13/06
• CPC Class Codes: H01F 41/127 Encapsulating or impregnating encapsulating coil and core H01F41/005

Abstract

The present invention is to provide a wire wound electronic component with stable quality, as well as raising reliability thereof by improving heat radiation, water-proofness, resistance against static electricity, resistance against stresses, magnetic characteristic thereof.

Powder of one or both of an inorganic material and a metallic material having higher thermal conductivity than a resin is added as a filler in the above resin, or a mixture of one or both of powders of the said inorganic material or the said metallic material and powders of a ferrite material for magnetic shielding is added as a filler in the above resin. When a sealing resin comprising a high thermal conductive material added thereto is used, heat generated inside a wire wound electronic component by passing a current through a coil conductor is effectively released outside the component, and the component can have a good heat radiation. Especially when the metallic powder is used as an additive, static electricity is prevented from being charged and generation of static electricity is also restrained.

Claims

1. A wire wound electronic component, comprising:

a bobbin comprising a core with two ends, having a flange at each end, the flanges defining a recess between them;

a coil of wire wound around the core between the flanges;

a resin seal surrounding the coil between the flanges, said resin seal comprising;

a first layer containing a first proportion of ferrite, and

a second layer containing a second proportion of ferrite that is higher than said first proportion of ferrite, and

powder of higher thermal conductivity than the resin;

wherein the powder comprises ferrite, and the coefficient of thermal expansion of the resin seal is similar to that of the bobbin.