Planar inductor
First Claim
Patent Images
1. A planar inductor, comprising:
- a planar inductance element comprising a coil having a plurality of windings, the plurality of windings all extending in the same plane; and
at least one ferromagnetic layer stacked on said planar inductance element;
wherein said at least one ferromagnetic layer comprises a plurality of ferromagnetic sub-layers stacked directly upon one another with no intervening structure between the plurality of sub-layers.
0 Assignments
0 Petitions
Accused Products
Abstract
A planar inductor has a spiral coil, insulating layers stacked on both surfaces of the spiral coil, and ferromagnetic layers stacked on the insulating layers, wherein each ferromagnetic layer has a saturation magnetization 4πMS of 10 kG or more, and a thickness of 100 μm or less.
-
Citations
45 Claims
-
1. A planar inductor, comprising:
-
a planar inductance element comprising a coil having a plurality of windings, the plurality of windings all extending in the same plane; and
at least one ferromagnetic layer stacked on said planar inductance element;
wherein said at least one ferromagnetic layer comprises a plurality of ferromagnetic sub-layers stacked directly upon one another with no intervening structure between the plurality of sub-layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
6. The planar inductor according to claim 1, wherein said at least one ferromagnetic layer consists of a hyperfine grain alloy ribbon obtained by thermally treating an Fe-based amorphous alloy ribbon at a temperature that is higher than a crystallization temperature of said Fe-based amorphous alloy ribbon.
-
7. The planar inductor according to claim 1, wherein insulating layers and ferromagnetic layers are stacked on both surfaces of said planar inductance element.
-
8. The planar inductor according to claim 7, wherein said planar inductance element comprises a spiral coil.
-
9. The planar inductor according to claim 7, wherein said planar inductance element has a structure obtained by stacking a plurality of spiral coils with insulating layers interposed therebetween.
-
10. The planar inductor according to claim 1, further comprising:
-
a coating of a mold resin surrounding said planar inductor element and said at least one ferromagnetic layer; and
a relaxation layer formed on said ferromagnetic layer, for providing strain relaxation due to contraction of said coating of a mold resin when said coating of a mold resin is hardened.
-
-
11. The planar inductor according to claim 10, wherein said relaxation layer consists of an organic polymer film, said organic polymer film having a thermal deformation temperature which is higher than a hardening temperature of the mold resin.
-
12. The planar inductor according to claim 11, wherein said organic polymer film consists of polyphenylenesulfide.
-
13. The planar inductor according to claim 11, wherein the thickness of said organic polymer film is less than 20 μ
- m.
-
14. An inductor according to claim 1, wherein said plurality of sub-layers comprises at least three sub-layers.
-
15. A planar inductor, comprising:
a laminated structure including a spiral conductor coil means for conducting a current, said spiral conductor coil means is sandwiched between ferromagnetic layers, each ferromagnetic layer comprising a plurality of ferromagnetic ribbons which are sandwiched together, each ferromagnetic ribbon having a thickness of not more than 100 microns.
-
16. A planar inductor comprising:
-
a first ferromagnetic layer;
a coil stacked on said first ferromagnetic layer;
a second ferromagnetic layer stacked on said coil;
wherein the first ferromagnetic layer comprises a plurality of ferromagnetic sub-layers that are stacked upon one another; and
wherein there are no coils between the stacked plurality of ferromagnetic sub-layers.
-
-
17. A planar inductor, comprising:
-
a first ferromagnetic layer;
a coil stacked upon said first ferromagnetic layer;
a second ferromagnetic layer stacked upon said coil so that the coil is sandwiched between the first and second ferromagnetic layers;
wherein the first ferromagnetic layer comprises a plurality of a sub-layers that are stacked upon one another and the second ferromagnetic layer comprises a plurality of sub-layers that are stacked upon one another; and
wherein all coils of the planar inductor are disposed between the first and second ferromagnetic layers.
-
-
18. A planar inductor, comprising:
-
a planar inductance element; and
at least one ferromagnetic layer stacked on said planar inductance element;
where said ferromagnetic layer is two-dimensionally divided into a plurality of ferromagnetic portions.
-
-
19. A planar inductor having an inductance, comprising:
-
at least one ferromagnetic layer, each ferromagnetic layer having a saturation magnetization that is greater than 10 kG and a thickness of less than 100 microns; and
a coil stacked on said ferromagnetic layer and having a Plurality of windings, the Plurality of windings all extending in the same plane. - View Dependent Claims (20, 21, 22, 23, 24, 25)
an insulating layer interposed between said coil and said ferromagnetic layer.
-
-
22. A planar inductor according to claim 19, wherein:
said saturization magnetization is greater than 12 kilogauss.
-
23. A planar inductor according to claim 19, further comprising:
-
a plurality of stacked spiral coils; and
an insulating layer between each pair of adjacent coils.
-
-
24. A planar inductor according to claim 19, wherein:
said at least one ferromagnetic layer comprises a plurality of ferromagnetic layers.
-
25. An inductor according to claim 19, wherein said at least one ferromagnetic layer comprises at least three ferromagnetic layers.
-
26. A planar inductor, comprising:
-
a laminated structure including a spiral conductor coil means for conducting a current, said spiral conductor coil means comprises a plurality of windings, the plurality of windings all extending in the same plane, wherein said spiral conductor coil means is sandwiched between ferromagnetic layers, each of said ferromagnetic layers comprising a plurality of ferromagnetic ribbons which are sandwiched together; and
wherein an effective permeability at 10 kilohertz of each ferromagnetic layer is at least 1×
104.- View Dependent Claims (27)
-
- 28. A planar inductor comprising a laminated structure including a planar inductance element comprising a plurality of windings, the plurality of windings all extending in the same plane, said planar inductance element is sandwiched between ferromagnetic layers each including a plurality of ferromagnetic ribbons, each one of said plurality of ferromagnetic ribbons having a thickness of 100 microns or less.
-
33. A planar inductor, comprising:
-
a planar inductance element comprising a plurality of conducting coils which are stacked upon one another and separated from one another only by an insulating non-ferromagnetic layer, each of said conducting coils comprising a plurality of windings, a first plurality of windings for a first one of the Plurality of conducting coils all extending in the same plane; and
at least one ferromagnetic layer stacked on said planar inductance element;
wherein said at least one ferromagnetic layer is formed from a plurality of ferromagnetic sub-layers that are stacked upon one another and each of the plurality of ferromagnetic sub-layers has a thickness of 100 microns or less. - View Dependent Claims (34, 35, 36, 37)
-
-
38. A planar inductor, comprising:
-
a planar inductance element comprising a plurality of windings, the plurality of windings all extending in the same plane; and
at least one ferromagnetic layer stacked on said planar inductance element;
wherein said at least one ferromagnetic layer comprises a plurality of ferromagnetic sub-layers which are stacked upon one another and form said ferromagnetic layer and have no electrically conductive material between them. - View Dependent Claims (39, 40)
-
- 41. A planar conductor comprising a laminated structure including spiral conductor coil means sandwiched between ferromagnetic layers each including a plurality of ferromagnetic ribbons, each of said ferromagnetic ribbons having a thickness of 100 microns or less.
Specification