Coil element
AssigneeTaiyo Yuden Co., Ltd.
InventorHirotaka Wakabayashi
Life of this patent
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Abstract
A coil element includes a core member, a plate portion connected to one end of the columnar portion, a coil conductor wire, and a terminal electrode. The core member has a flat-shaped connection end portion provided in each of both end portions of the coil portion. The plate portion has a principal surface, a first surface connected to the principal surface, and a second surface connected to the principal surface and the first surface. The terminal electrode has an electrode layer and a joint layer. The electrode layer is formed on either the first surface or the second surface of the plate portion. The joint layer includes a cavity portion locally provided between the connection end portion and the electrode layer and joins the connection end portion and the electrode layer to each other.
Claims14
A coil element, comprising:
- a core member having a columnar portion having an axis extending in a thickness direction;
- a plate portion connected to one end of the columnar portion in the thickness direction, the plate portion having a principal surface, a first surface connected to the principal surface, and a second surface connected to the principal surface and the first surface;
- a coil conductor wire having:
- a coil portion wound on the columnar portion;
- and
- a flat-shaped connection end portion provided in each of both end portions of the coil portion;
- and
- a terminal electrode having:
- an electrode layer formed at least on either the first surface or the second surface of the plate portion;
- and
- a joint layer formed on a surface of the electrode layer, the joint layer including one or more cavity portions locally provided between the connection end portion and the electrode layer and joining the connection end portion and the electrode layer to each other,
- wherein the joint layer has:
- a first conductive layer covering the electrode layer;
- a second conductive layer covering the first conductive layer;
- and
- an alloy layer provided between the connection end portion and the first conductive layer.
A coil element, comprising:
- a core member having a columnar portion;
- a plate portion (12) connected to one end of the columnar portion in the thickness direction, the plate portion having a principal surface (LS surface), a first surface (LT surface)connected to the principal surface, and a second surface (ST surface) connected to the principal surface and the first surface;
- a coil conductor wire having:
- a coil portion wound on the columnar portion;
- and
- a flat-shaped connection end portion provided in each of both end portions of the coil portion;
- and
- a terminal electrode having:
- an electrode layer formed either the first surface or the second surface of the plate portion;
- and
- a joint layer formed on a surface of the electrode layer, the joint layer including a plurality of cavity portions locally provided between the connection end portion and the electrode layer and joining the connection end portion and the electrode layer to each other,
- wherein the joint layer has:
- a first conductive layer covering the electrode layer;
- and
- a second conductive layer covering the first conductive layer.
Dependencies are inferred from the claim text.