Laminated common-mode choke coil
AssigneeTaiyo Yuden Co., Ltd.
InventorsTakashi Nakajima, Mika Tamanoi, Kenji Otake
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Abstract
A laminated common-mode choke coil offering higher insulation reliability has a glass ceramic layer, two spiral internal conductors facing each other and sandwiching the glass ceramic layer in between, and insulation layers sandwiching the two internal conductors, wherein the glass ceramic layer contains segregated Al regions and the maximum dimension t1 of each segregated Al region in the glass ceramic layer, in the layer-thickness direction, is no more than 80% of the distance t0 between the two internal conductors.
Claims7
A laminated common-mode choke coil having a glass ceramic layer, two spiral internal conductors facing each other and sandwiching the glass ceramic layer in between, and insulation layers sandwiching the two internal conductors;
- wherein the glass ceramic layer contains segregated Al regions where a concentration of Al is substantially higher than that in other areas of the glass ceramic layer, and a maximum dimension of each segregated Al region in the glass ceramic layer, in a layer-thickness direction, is no more than 80% of a distance between the two internal conductors;
- and
- wherein the glass ceramic layer contains Al in an amount of 0.05% to 5% by weight as Al2O3 relative to a glass material contained in the glass ceramic layer, and a median size of particles constituting the glass material is 3 μm or less.
Dependencies are inferred from the claim text.