MULTILAYER INDUCTOR
First Claim
1. A multilayer inductor comprising:
- a laminate comprising a plurality of first insulating layers and a plurality of strip-shaped conductive layers formed thereon, and the conductive layers being connected to form a helical coil; and
at least a second insulating layer having a magnetic permeability lower than those of the first insulating layers, the second insulating layer being disposed to cross one of an inner magnetic path and an outer magnetic path of the helical coil, wherein at least a part of the second insulating layer overlaps with the conductive layer in the stacking direction, and the second insulating layer is in contact with the conductive layer in the overlap portion.
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Accused Products
Abstract
A multilayer inductor having a uniformly improved direct current superposition property and an increased inductance value is disclosed. The multilayer inductor contains a laminate of a plurality of first insulating layers and a plurality of conductive layers, and the conductive layers and through hole conductors are connected to form a helical coil in the laminate. A second insulating layer which has a magnetic permeability lower than those of the first insulating layers is disposed such that it crosses an inner magnetic path of the helical coil, and a margin of the second insulating layer overlaps with the conductive layer in the stacking direction and is in contact with the conductive layer in the overlap portion. The magnetic flux density in the laminate is likely to be highest in the overlap portion, and thus, the highest-density magnetic flux passes through the second insulating layer inevitably, whereby the direct current superposition property can be uniformly improved.
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Citations
10 Claims
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1. A multilayer inductor comprising:
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a laminate comprising a plurality of first insulating layers and a plurality of strip-shaped conductive layers formed thereon, and the conductive layers being connected to form a helical coil; and
at least a second insulating layer having a magnetic permeability lower than those of the first insulating layers, the second insulating layer being disposed to cross one of an inner magnetic path and an outer magnetic path of the helical coil, wherein at least a part of the second insulating layer overlaps with the conductive layer in the stacking direction, and the second insulating layer is in contact with the conductive layer in the overlap portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of making a multilayer inductor, the multilayer inductor comprising strips of conductive material sandwiched within layers of insulating material having a first magnetic permeability, the method comprising:
depositing additional material between at least some of said layers of insulating material, said additional material having a second magnetic permeability that is less than the first magnetic permeability, wherein at least some of said additional material is positioned to overlap an inner or outer edge of at least some of said strips of conductive material.
Specification