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公开(公告)号：US20240013955A1
公开(公告)日：2024-01-11
申请号：US18252671
申请日：2021-11-16
发明人： Keiji KAWAJIRI , Naoki MUTOU , Hironori MOTOMITSU , Michiya WATANABE , Yuji YAMAGISHI , Yasuhiro NISHIMURA
摘要： A multilayer varistor includes a sintered body, a first external electrode, a second external electrode, a first internal electrode, a second internal electrode, and a high-resistivity portion. The first internal electrode is provided inside the sintered body and electrically connected to the first external electrode. The second internal electrode is provided inside the sintered body and electrically connected to the second external electrode. The high-resistivity portion includes: a surface high-resistivity portion provided to cover a surface of the sintered body; and an inner high-resistivity portion extended inward from the surface high-resistivity portion inside the sintered body.
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公开(公告)号：US20230081158A1
公开(公告)日：2023-03-16
申请号：US17892711
申请日：2022-08-22
IPC分类号： H01C7/102 , H01C7/112 , H01C7/10 , H01C1/142 , H01C17/065
摘要： A varistor includes a sintered body, an internal electrode, an insulating layer, and an external electrode. The internal electrode is disposed in an interior of the sintered body. The insulating layer covers at least part of the sintered body and includes Zn2SiO4. The external electrode is electrically connected to the internal electrode, covers part of the sintered body and part of the insulating layer, and is in contact with the part of the insulating layer. The insulating layer has a region being in contact with the external electrode, the region having a greater average thickness than a region of the insulating layer which is out of contact with the external electrode.
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公开(公告)号：US20230245806A1
公开(公告)日：2023-08-03
申请号：US18098998
申请日：2023-01-19
发明人： Naoki MUTOU , Yoshiyuki SATOU , Yuji YAMAGISHI , Ken YANAI
IPC分类号： H01C7/112 , H01C7/18 , C04B35/453 , C04B35/64
CPC分类号： H01C7/112 , C04B35/64 , C04B35/453 , H01C7/18
摘要： A method for manufacturing a multilayer varistor includes: a first step including providing a multilayer stack in which a plurality of green sheet layers, each containing a Zn oxide powder as a main component and a Pr oxide powder as a sub-component, and a plurality of internal electrode paste layers, each containing a Pd powder, are alternately stacked; and a second step including forming a sintered compact, including an internal electrode inside, by baking the multilayer stack. The second step includes: a first sub-step including baking the multilayer stack by setting an oxygen concentration in an atmosphere at 1000 ppm by volume or less while increasing a temperature from 500° C. to 800° C.; and a second sub-step including baking, after the first sub-step, the multilayer stack by setting the oxygen concentration in the atmosphere at 1000 ppm by volume or more while increasing the temperature to a maximum allowable temperature.
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公开(公告)号：US20230245805A1
公开(公告)日：2023-08-03
申请号：US18099008
申请日：2023-01-19
发明人： Yuji YAMAGISHI , Yoshiyuki SATOU , Naoki MUTOU
摘要： A multilayer varistor according to the present disclosure includes a sintered compact, at least one pair of internal electrodes, and at least one pair of external electrodes. The sintered compact contains at least a Zn oxide and a Pr oxide. The at least one pair of internal electrodes are provided inside the sintered compact and contain, as a main component, at least one selected from the group consisting of Pd and Ag and, as a sub-component, an oxide of at least one element selected from the group consisting of Pr, Mn, Co, and Sb. The at least one pair of external electrodes are arranged to cover the sintered compact partially and electrically connected to the at least one pair of internal electrodes, respectively.
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公开(公告)号：US20220310291A1
公开(公告)日：2022-09-29
申请号：US17838961
申请日：2022-06-13
发明人： Ken YANAI , Tomokazu YAMAGUCHI , Yuji YAMAGISHI , Naoki MUTOU , Sayaka MATSUMOTO , Ryosuke USUI
摘要： A sintered body that includes semiconductor ceramic layers and an internal electrode which are alternately stacked on one another is prepared. A first external electrode is formed on a side surface of the sintered body such that the first external electrode is connected to the internal electrode. An insulating layer is formed on a surface of the sintered body by applying a glass coating over an entire of the sintered body having the formed first external electrode. The insulating layer is exposed from the first external electrode. A second external electrode is formed on the first external electrode. This method provides the produced multilayer electronic component with a stable electric connection between the internal electrodes and the external electrodes.
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