A coil component includes: a core part including: a winding shaft; and a planar flange part provided at an axial-direction end of the winding shaft, and having a groove part provided on an exterior face thereof where a lead part led out from a conductor wound around the winding shaft into the groove part, wherein the flange part has a first recessed part provided on a first side face intersecting with the long axis of the groove part and communicated with the groove part, wherein the area of a cross section, taken in a direction parallel with the first side face, of the first recessed part, is greater than the area of a cross section, taken in a direction parallel with the first side face.

A multilayer coil component includes an inner conductor, a component element assembly including the inner conductor, and outer conductors disposed at respective end portions of the component element assembly. The component element assembly has a first region in which the primary component is composed of a magnetic material and which may contain a nonmagnetic material and second regions which are disposed at respective end portions of the first region and which contain at least a nonmagnetic material. Each second region is disposed having a greater volume content of the nonmagnetic material than the first region such that, for example, the difference in the volume content results about 25% by volume or more. The coil portion of the inner conductor is embedded in the first region, and the length of the second region is greater than or equal to the length of the side-surface folded portion of the outer conductor.

A multilayer coil component includes an inner conductor, a component element assembly including the inner conductor, and outer conductors disposed at respective end portions of the component element assembly. The component element assembly has a first region in which the primary component is composed of a magnetic material and which may contain a nonmagnetic material and second regions which are disposed at respective end portions of the first region and which contain at least a nonmagnetic material. Each second region is disposed having a greater volume content of the nonmagnetic material than the first region such that, for example, the difference in the volume content results about 25% by volume or more. The coil portion of the inner conductor is embedded in the first region, and the length of the second region is greater than or equal to the length of the side-surface folded portion of the outer conductor.

A coil component includes a base body containing metal magnetic particles and a binder binding together the metal magnetic particles and having a first surface extending along a coil axis and a second surface opposing the first surface, a first external electrode provided on the base body, a second external electrode provided on the base body, and a coil conductor electrically connected to the first and second external electrodes and extending around the coil axis. In one embodiment, the coil conductor has a winding portion, the winding portion has first conductor portions and one or more second conductor portions smaller in number than the first conductor portions, and the first and second conductor portions alternate with and are connected to each other, and a distance between the first conductor portions and the first surface is less than a distance between the second conductor portions and the second surface.

A reactor that includes a coil having a wound portion; a magnetic core; a holding member provided at both ends of the wound portion; a mold resin by which the coil and the holding member are integrated into one piece; a casing that houses an assembly that includes the coil, the magnetic core, and the holding member; and a potting resin that fills up the casing to seal at least a part of the assembly.

A reactor that includes a coil having a wound portion; a magnetic core; a holding member provided at both ends of the wound portion; a mold resin by which the coil and the holding member are integrated into one piece; a casing that houses an assembly that includes the coil, the magnetic core, and the holding member; and a potting resin that fills up the casing to seal at least a part of the assembly.

Zinc is added to a metal magnetic alloy powder including iron and silicon. An element is formed using this magnetic material, and a coil is formed inside or on the surface of the element.

The present invention discloses a power inductor encapsulated through injection molding. The power inductor comprises a coil winding, a soft magnetic ferrite middle column inserted in a middle of the coil winding, and a magnetic powder glue for encapsulating the coil winding and the soft magnetic ferrite middle column through injection molding. The power inductor is square and meets L≧W and 2rc>0.4×2W, wherein a section width of the soft magnetic ferrite middle column perpendicular to a height direction of the inductor is 2rc, a length of the power inductor is 2L, and a width of the power inductor is 2W. According to the present invention, a balanced direct-current resistance and a direct-current superposition saturation characteristic can be obtained, and the direct-current resistance is greatly decreased while an excellent direct-current superposition saturation characteristic is ensured.

An electromagnetic component assembly includes a first magnetic core piece, a second magnetic core piece, and an inverted U-shaped conductive winding including a base section and first and second legs extending from base section. One of the first and second magnetic core pieces is configured to receive the base section. The first and second magnetic core pieces are gapped from one another to define a first gap, and one of the first and second magnetic core pieces includes a second gap that, in combination with the first gap, allows the component to be operated at more than one stable open circuit inductance (OCL) corresponding to different current loads.

A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers in a length direction and that has a built-in coil, and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed by a plurality of coil conductors stacked in the length direction being electrically connected to each other. The first and second outer electrodes respectively cover at least parts of first and second end surfaces. A stacking direction and a coil axis direction are parallel to the first main surface. A length of a region in which the coil conductors are arranged in the stacking direction is from 85% to 95% of a length of the multilayer body. A distance between coil conductors adjacent to each other in the stacking direction lies in a range from 12 μm to 40 μm.