Composite devices of laminate type and processes for producing same
AssigneeSanyo Electric Co., Ltd.
InventorsTakashi Umemoto, Hideki Yoshikawa, Hitoshi Hirano
Life of this patent
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Abstract
In a composite device having a laminate structure of a magnetic body ceramic layer 1 and a dielectric ceramic layer 2, an intermediate layer 3 is interposed between the ceramic layers 1 and 2. The intermediate layer 3 varies in composition in the direction of thickness thereof and exhibits substantially the same shrinkage as the magnetic body ceramic layer 1 at a joint thereof with this layer 1 when fired and substantially the same shrinkage as the dielectric ceramic layer 2 at a joint thereof with the layer 2 when fired, whereby the ceramic layers can be prevented from cracking or separating during firing.
Claims26
A composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition, each of the ceramic layers having one or a plurality of circuit element patterns formed on a surface thereof to provide an electronic circuit for performing a predetermined function, an intermediate layer being interposed between the first ceramic layer and the second ceramic layer, the intermediate layer varying in composition in the direction of thickness thereof and exhibiting substantially the same shrinkage as the first ceramic layer at a joint thereof with the first ceramic layer when fired and substantially the same shrinkage as the second ceramic layer at a joint thereof with the second ceramic layer when fired.
A process for producing a composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition, each of the ceramic layers having one or a plurality of circuit element patterns formed on a surface thereof, the circuit element patterns of the ceramic layers being connected to each other to provide an electronic circuit for performing a predetermined function, the process having the steps of:
- preparing a first green sheet having one or a plurality of circuit element patterns formed on a surface thereof, a second green sheet having one or a plurality of circuit element patterns formed on a surface thereof, and an intermediate green sheet varying in composition in the direction of thickness thereof and exhibiting at one surface thereof substantially the same shrinkage as the first green sheet when fired and at the other surface thereof substantially the same shrinkage as the second green sheet when fired,
- preparing a laminate comprising a plurality of layers by sandwiching the intermediate green sheet between the first green sheet and the second green sheet, with said one surface facing the first green sheet and with said other surface facing the second green sheet, and
- firing the laminate.
A composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition, each of the ceramic layers having one or a plurality of circuit element patterns formed on a surface thereof to provide an electronic circuit for performing a predetermined function, at least one of the first ceramic layer and the second ceramic layer as arranged in contact with each other varying in composition in the direction of thickness thereof and exhibiting substantially the same shrinkage as the other ceramic layer at a joint thereof with the other ceramic layer when fired.
A green sheet for use in fabricating a composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition and arranged in contact with each other, the green sheet being serviceable as a material for at least one of the first ceramic layer and the second ceramic layer, the green sheet varying in composition in the direction of thickness thereof and exhibiting the same shrinkage as other green sheet for making the other ceramic layer at a joint thereof with the other green sheet when fired.
A process for producing a composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer which are different in composition, each of the ceramic layers having one or a plurality of circuit element patterns formed on a surface thereof to provide an electronic circuit for performing a predetermined function, the process having the steps of:
- preparing first green sheets for making first ceramic layers and second green sheets for making second ceramic layers,
- forming one or a plurality of circuit element patterns on a surface of each of a required number of first green sheets and a required number of second green sheets, preparing a laminate comprising a plurality of layers by superposing the first green sheets and the second green sheets each having the circuit element pattern or patterns formed thereon, and
- firing the laminate,
- at least one of the first green sheet and the second green sheet to be arranged in contact with each other in the laminate preparing step being made to vary in composition in the direction of thickness thereof in the sheet preparing step so that one surface of said one green sheet exhibits substantially the same shrinkage as the other green sheet when fired, said one green sheet being superposed on the other green sheet in the laminate preparing step, with said one surface thereof facing the other green sheet.
A composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition, each of the ceramic layers having one or a plurality of circuit element patterns formed on a surface thereof to provide an electronic circuit for performing a predetermined function, the first ceramic layer having a three-layer structure comprising an intermediate layer having a composition serviceable as a main body, and a pair of surface layers arranged on opposite sides of the intermediate layer and having the same composition as the second ceramic layer.
A green sheet for use in fabricating a composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition, the green sheet being serviceable as a material for the first ceramic layer and having a three-layer structure, the three-layer structure comprising an intermediate layer of a composition serviceable as a main body, and a pair of surface layers arranged on opposite sides of the intermediate layer and having the same composition as another green sheet for making the second ceramic layer.
A process for producing a composite device of the laminate type having a laminate structure of a first ceramic layer and a second ceramic layer different from each other in composition, each of the ceramic layers having one or a plurality of circuit element patterns formed on a surface thereof to provide an electronic circuit for performing a predetermined function, the process having the steps of:
- preparing first green sheets for making first ceramic layers and second green sheets for making second ceramic layers,
- forming one or a plurality of circuit element patterns on a surface of each of a required number of first green sheets and a required number of second green sheets,
- preparing a laminate comprising a plurality of layers by superposing the first green sheets and the second green sheets each having the circuit element pattern or patterns formed thereon, and
- firing the laminate,
- the first green sheets being each given by the sheet preparing step a three-layer structure comprising an intermediate layer of a composition serviceable as a main body and a pair of surface layers arranged on opposite sides of the intermediate layer and having the same composition as the second green sheet.
Dependencies are inferred from the claim text.