Patent ID: 11948730
Assignee: SEIKO EPSON CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  C | IPC B  H

Claim 8:
9. A powder magnetic core, formed by compacting
magnetic alloy powder particles, and
an insulator that coats surfaces of the magnetic alloy powder particles, wherein
the insulator includes:
a first insulator in a film form that coats the surfaces of the magnetic alloy powder particles,
a second insulator in a particulate form, wherein
the first insulator is between the magnetic alloy powder particles and the second insulator, and
the second insulator is enclosed in each of a plurality of protrusions, and

a third insulator in a film form that coats at least a part of a surface of the second insulator and specific regions of the first insulator,

the specific regions of the first insulator correspond to regions that are not in contact with the second insulator,
the third insulator protrudes in a region that coats the second insulator,
the protrusion of the third insulator corresponds to the plurality of protrusions,
a number of protrusions of the plurality of protrusions corresponds to a number of particles of the second insulator at the surface of the magnetic alloy powder particles, and
a void surrounded by the second insulator or the third insulator is included.