Taiyo Yuden Co., Ltd.

Shoji Kusumoto

Tetsuhiko Fukuoka

Ryo Ono

Akihiko Kono

Koichiro Morita

Tomoaki Nakamura

Mikio Tahara

Shota Tanaka

A multi-layer ceramic electronic component includes (I) a ceramic body including (i) a protective portion that includes an end surface facing in a first direction, circumferential surfaces, and a ridge including a recess extending along the first direction and connects the circumferential surfaces, and (ii) a functional portion including internal electrodes laminated in a second direction, and (II) an external electrode including (i) a base film covering the end surface and including a first, second, and third covering portions formed on the end surface, on the circumferential surfaces, and on the recess, respectively, (ii) an intermediate film formed on the base film and continuously covering the first, second, and third covering portions, and (iii) a surface film formed on the intermediate film, wherein the recess is disposed outside end portions of the internal electrodes in a third direction orthogonal to the first and second directions.

Multi-layer ceramic electronic component and method of producing the same

A multilayer ceramic electronic device includes a ceramic functional part having a generally rectangular shape in which a plurality of ceramic dielectric layers and a plurality of internal electrodes are laminated alternately in a vertical direction; a pair of cover parts that cover the functional part from top and bottom, respectively; and a pair of side margin parts covering side surfaces of the functional part, respectively, wherein an end portion of an uppermost internal electrode among the plurality of internal electrodes is curved downward to satisfy a&#x2265;1 &#x3bc;m and 0.1&#x2264;a/b&#x2264;0.4, where a is a dimension of the curved end portion in the vertical direction in a cross section taken along a plane perpendicular to the side surfaces, and b is a dimension of the curved end portion in a horizontal direction in said cross section.

Multilayer ceramic electronic device and method for manufacuting same

A multi-layer ceramic capacitor includes a multi-layer unit and a side margin. The multi-layer unit includes ceramic layers laminated in a first direction, internal electrodes disposed between the ceramic layers, a main surface oriented in the first direction, a surface layer portion in a range from the main surface to a predetermined depth, and a center portion adjacent to the surface layer portion in the first direction. The side margin covers the multi-layer unit from a second direction orthogonal to the first direction. The ceramic layers have an average dimension in the first direction that is 0.4 &#x3bc;m or less. Each of the internal electrodes includes an oxidized region adjacent to the side margin. The oxidized region in the surface layer portion has a dimension in the second direction that is equal to or more than two times the average dimension of the ceramic layers in the first direction.

Multi-layer ceramic capacitor

A multi-layer ceramic electronic component includes a ceramic body and an external electrode, the ceramic body including a protective portion and a functional portion, the protective portion including an end surface facing in a first direction, circumferential surfaces connected to the end surface and extending in the first direction, and a ridge that includes a recess extending along the first direction and connects the circumferential surfaces, the functional portion being disposed inside the protective portion, the external electrode including a base film covering the end surface, an intermediate film formed on the base film, and a surface film formed on the intermediate film, the base film including a first covering portion formed on the end surface, second covering portions formed on the circumferential surfaces, and a third covering portion formed on the recess and spaced apart from at least one second covering portion, the intermediate film continuously covering the first, second, and third covering portions.

A multi-layer ceramic electronic component includes a ceramic body including a multi-layer unit, a side margin, and ridges. The multi-layer unit includes a capacitance forming unit including ceramic layers laminated in a first direction and internal electrodes disposed between the ceramic layers, a cover that covers the capacitance forming unit in the first direction, and a side surface facing in a second direction orthogonal to the first direction. The side margin covers the side surface. The ridges are rounded and extend in a third direction orthogonal to the first and second directions. The capacitance forming unit includes a first region disposed at a center portion in the first direction, and a second region disposed between the cover and the first region, end portions of the internal electrodes in the second direction in the second region being positioned inward in the second direction relative to those in the first region.

A multi-layer ceramic electronic component includes a ceramic body and an external electrode, the ceramic body including a protective portion and a functional portion, the protective portion including an end surface facing in a first direction, circumferential surfaces connected to the end surface and extending in the first direction, and a ridge that includes a recess extending along the first direction and connects the circumferential surfaces, the functional portion being disposed inside the protective portion, the external electrode including a base film covering the end surface, and a plating film formed on the base film, the base film including a first covering portion formed on the end surface, second covering portions formed on the circumferential surfaces, and a third covering portion formed on the recess and spaced apart from at least one second covering portion, the plating film continuously covering the first, second, and third covering portions.

A multi-layer ceramic electronic component includes a multi-layer unit and a side margin. The multi-layer unit includes ceramic layers laminated in a first direction, internal electrodes disposed between the ceramic layers, a main surface that faces in the first direction, and a side surface that faces in a second direction orthogonal to the first direction, the internal electrodes being exposed from the side surface. The side margin includes a side-surface-covering portion that is disposed on the side surface, and an end portion that includes an extended portion extending from the side surface to the main surface and having a first dimension of 0.1 &#x3bc;m or more in the first direction and a second dimension of 0.1 &#x3bc;m or more in the second direction.

Multi-layer ceramic electronic component

A multi-layer ceramic electronic component includes a ceramic body including: a multi-layer unit including a capacitance forming unit including ceramic layers laminated in a first direction and internal electrodes disposed therebetween, a side surface facing in a second direction orthogonal to the first direction, an end surface facing in a third direction orthogonal to the above directions, a drawn portion extending from the capacitance forming unit in the third direction, the internal electrodes being drawn to the end surface, and a cover that covers the capacitance forming unit and the drawn portion in the first direction; and a side margin that covers the side surface. The drawn portion includes a first region and a second region disposed between the cover and the first region, an end portion of each internal electrode in the second region being positioned inward in the second direction relative to that in the first region.

A multi-layer ceramic capacitor includes: a multi-layer unit including a capacitance forming unit including internal electrodes laminated in a first direction, a drawn portion extending from the capacitance forming unit in a second direction, and a cover that covers the capacitance forming unit and the drawn portion in the first direction, the multi-layer unit having a main surface facing in the first direction, an end surface facing in the second direction, and a side surface facing in a third direction; and a side margin provided to the side surface, the side surface including a first straight portion including an outer edge of the main surface and extending in the second direction, a second straight portion including an outer edge of the end surface and extending in the first direction, and a corner portion that connects the first and second straight portions with each other, the corner portion being curved.

A multi-layer ceramic capacitor includes a body including a multi-layer unit and a side margin, and an external electrode. The multi-layer unit includes ceramic layers laminated in a first direction, first and second internal electrodes alternately disposed between the ceramic layers, an end surface oriented in a second direction orthogonal to the first direction, the first internal electrode being drawn from the end surface, an end margin disposed between the end surface and the second internal electrode, and a side surface oriented in a third direction orthogonal to the former directions, the internal electrodes being exposed to the side surface. The side margin covers the side surface. The external electrode includes an entry portion and covers the body from the side of the end surface, the entry portion being disposed on the end margin and entering a gap between the side surface and the side margin from the end surface.

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Tokyo, Japan

Shoji Kusumoto