US 2018/0322998 A1Published application

Inductor element

AssigneeTDK Corporation

InventorsYasuhide YAMASHITA, Katsushi YASUHARA, Chiomi SATO, Syota GOTO

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Abstract

An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. An inner-core central region is a region of the core portion within a distance from a winding axis center of the wire-winding portion toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. A top-plate central region is a region of the core portion within a distance from the winding axis center toward a no-existing region of the wire-winding portion in the outward direction. Sα−Sβ≥−2% is satisfied, where Sα (%) and sβ (%) are respectively an area ratio of the magnetic powder in the inner-core central region and the top-plate central region.

Claims8

Dependent claims

An inductor element, comprising:

a wire-winding portion where a conductor is wound in a coil shape;
and
a core portion surrounding the wire-winding portion and containing a magnetic powder and a resin,
wherein an inner-core central region is defined as a region of the core portion within a predetermined distance from a winding axis center of the wire-winding portion toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center,
wherein a top-plate central region is defined as a region of the core portion within a predetermined distance from the winding axis center toward a no-existing region of the wire-winding portion in the outward direction, and
wherein Sα−Sβ≥−2% is satisfied, where Sα (%) is an area ratio of the magnetic powder in the inner-core central region, and Sβ (%) is an area ratio of the magnetic powder in the top-plate central region, on a cross section of the inductor element passing the winding axis center and parallel thereto.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/968,036Filed 1 May 2018
Priority: JP 2017-0916632 May 2017
Published: 8 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

H01F 27/255
Magnetic cores: made from particles
B29C 43/14
Of articles of definite length, i.e. discrete articles: in several steps
B29C 43/18
Of articles of definite length, i.e. discrete articles: incorporating preformed parts or layers, e.g. compression moulding around inserts or for…
H01F 17/04
Fixed inductances of the signal type: with magnetic core

Family

US 10,984,941 B2Related patent
US 2018/0322998 A1This patent

From the US filing history. Foreign family members aren’t listed.

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