Core for wire-wound electronic component, wire-wound electronic component, and common mode choke coil

Abstract

A core for a wire-wound electronic component. The core has a winding base to be wound with a wire, and flanges located at both ends of the winding base in an extending direction of the winding base. The flanges protrude from the winding base in a first direction perpendicular to the extending direction. Each of the flanges has a plurality of protrusions on a first surface at a side of the flange in the first direction. An inclined surface is provided to extend from the first surface of each of the flanges to a second surface of the winding base at a side of the winding base in the first direction.

What is claimed is: 
     
       1. A core for a wire-wound electronic component, the core comprising:
 a winding base to be wound with a wire; and   flanges located at both ends of the winding base in an extending direction of the winding base and protruding from the winding base in a first direction perpendicular to the extending direction,   each of the flanges having a plurality of protrusions on a first surface at a side of the flange in the first direction, and   an inclined surface formed on the first surface of each of the flanges, in an area extending from a space between the plurality of protrusions to a second surface of the winding base at a side of the winding base in the first direction, so as to be inclined to the second surface.   
     
     
       2. The core according to  claim 1 , wherein the inclined surface and the second surface are at an obtuse angle to each other when viewed from a second direction perpendicular to the first direction and the extending direction. 
     
     
       3. The core according to  claim 2 ,
 wherein a third surface of each of the flanges in contact with the winding base includes a portion protruding from the winding base in the second direction; and   wherein the portion of the third surface protruding from the winding base in the second direction is located farther in the extending direction from a center of the winding base than a line of intersection between the inclined surface and the second surface.   
     
     
       4. The core according to  claim 1  through  3 , wherein the plurality of protrusions are arranged in the second direction at intervals. 
     
     
       5. A wire-wound electronic component comprising:
 a core according to  claim 1 ;   a wire; and   external electrodes provided on the respective protrusions,   wherein the wire extends on the inclined surface.   
     
     
       6. A common mode choke coil comprising:
 a core according to  claim 1 ;   a wire; and   external electrodes provided on the respective protrusions,   wherein the wire extends on the inclined surface.   
     
     
       7. A core for a wire-wound electronic component, the core comprising:
 a winding base to be wound with a wire;   flanges located at both ends of the winding base in an extending direction of the winding base and protruding from the winding base in a first direction perpendicular to the extending direction, at least one of the flanges having a first protrusion and a second protrusion on a first surface at a side of the flange in the first direction, the first protrusion and the second protrusion being arranged with a space therebetween in a second direction perpendicular to the first direction and the extending direction; and   an inclined surface extending from the first surface to a part of a second surface of the winding base, the second surface being located at a side of the winding base in the first direction, wherein   with respect to the extending direction, the first surface lies between the inclined surface and the first and the second protrusions, such that the inclined surface does not contact the first and second protrusions, and   the inclined surface and the second surface are at an obtuse angle to each other when viewed from the second direction perpendicular to the first direction and the extending direction.   
     
     
       8. The core according to claim 7, wherein
 when viewed from the first direction, one of the first protrusion and the second protrusion for each flange is substantially rectangular and has a chamfered corner at an intersection between a side facing the winding base and a side facing another of the first protrusion and the second protrusion of the same flange.   
     
     
       9. The core according to claim 7, wherein
 a third surface of each of the flanges in contact with the winding base includes a portion protruding from the winding base in the second direction; and   wherein the portion of the third surface protruding from the winding base in the second direction is located farther in the extending direction from a center of the winding base than a line of intersection between the inclined surface and the second surface.   
     
     
       10. The core according to claim 7, wherein the first protrusion and the second protrusion are arranged in the second direction at intervals. 
     
     
       11. A common mode choke coil comprising:
 the core according to claim 7;   the wire; and   external electrodes provided on the respective protrusions, wherein the wire extends on the inclined surface.   
     
     
       12. The common mode choke coil of claim 11, wherein for each flange there is a non-chamfered protrusion and a chamfered protrusion, and wherein the wire extends from an electrode of the non-chamfered protrusion to a position between the chamfered corner of the chamfered protrusion and the winding base before making contact with the winding base. 
     
     
       13. A wire-wound electronic component comprising:
 a core for the wire-wound electronic component, the core comprising:
 a winding base to be wound with a wire; 
 flanges located at both ends of the winding base in an extending direction of the winding base and protruding from the winding base in a first direction perpendicular to the extending direction, at least one of the flanges having a first protrusion and a second protrusion on a first surface at a side of the flange in the first direction, the first protrusion and the second protrusion being arranged with a space therebetween in a second direction perpendicular to the first direction and the extending direction; and 
 an inclined surface extending from the first surface to a part of a second surface of the winding base, the second surface being located at a side of the winding base in the first direction, wherein 
 with respect to the extending direction, the first surface lies between the inclined surface and the first and the second protrusions, such that the inclined surface does not contact the first and second protrusions, 
   the wire; and   external electrodes provided on the respective protrusions, wherein the wire extends on the inclined surface.   
     
     
       14. The wire-wound electronic component of claim 13, wherein for each flange there is a non-chamfered protrusion and a chamfered protrusion, and wherein the wire extends from an electrode of the non-chamfered protrusion to a position between the chamfered corner of the chamfered protrusion and the winding base before making contact with the winding base.