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1. 发明申请

US20080013252A1 Monolithic ceramic capacitor 有权
标题翻译：单片陶瓷电容器
公开(公告)号：US20080013252A1
公开(公告)日：2008-01-17
申请号：US11889556
申请日：2007-08-14
申请人： Makito Nakano , Akira Saito
发明人： Makito Nakano , Akira Saito
IPC分类号： H01G4/06
CPC分类号： H01G4/06 , H01G4/1218 , H01G4/30
摘要： A capacitor body includes a capacitance-forming section including an alternately arranged plurality of internal electrodes and plurality of dielectric ceramic layers and outer layer sections disposed on the upper or lower face of the capacitance-forming section (28). The outer layer sections include an outermost layer and a second layer (31) inwardly located therefrom. The second layer has a thermal expansion coefficient greater than that of the outermost layer by 1×10−6/° C. to 3×10−6/° C. The outermost layer has a thickness of 50 to 80 μm. The second layer has a thickness of 20 to 50 μm. The arrangement prevents cracks from being formed in a monolithic ceramic capacitor when external electrodes are formed by baking and cooling, and cracks caused by fatigue failure due to low-stress cycles such as heat cycles are prevented from reaching internal electrodes.
摘要翻译：电容器本体包括电容形成部，该电容形成部包括交替排列的多个内部电极和多个电介质陶瓷层，以及设置在电容形成部（28）的上表面或下表面上的外层部。外层部分包括最外层和从其向内定位的第二层（31）。第二层的热膨胀系数大于最外层的热膨胀系数1×10 -6 /℃至3×10 -6 /℃。最外层具有厚度为50至80毫米。第二层的厚度为20〜50μm。通过烧结和冷却形成外部电极，能够防止在单片陶瓷电容器中形成裂纹，并且防止由于诸如热循环的低应力循环引起的疲劳破坏引起的裂纹到达内部电极。

2. 发明授权

US07715172B2 Multilayer capacitor 有权
标题翻译：多层电容器
公开(公告)号：US07715172B2
公开(公告)日：2010-05-11
申请号：US12171442
申请日：2008-07-11
申请人： Kenichi Kawasaki , Noriyuki Inoue , Akira Saito , Makito Nakano , Kenichi Oshiumi
发明人： Kenichi Kawasaki , Noriyuki Inoue , Akira Saito , Makito Nakano , Kenichi Oshiumi
IPC分类号： H01G4/005 , H01G4/06
CPC分类号： H01G4/232 , H01G4/2325 , H01G4/30
摘要： A multilayer capacitor includes a capacitor body in which internal electrodes in a first internal electrode group are overlapped with internal electrodes in a second internal electrode group with dielectric layers sandwiched therebetween. A first external electrode has a first wraparound portion and a second wraparound portion, and a second external electrode has a third wraparound portion and a fourth wraparound portion. The volume proportions of the effective layers in a first area sandwiched between the first wraparound portion and the second wraparound portion and in a third area sandwiched between the third wraparound portion and the fourth wraparound portion are set to at least about 10%. The volume proportions of the effective layers in a second area toward a lower surface in the first area and in a fourth area toward the lower surface in the third area are set to about 15% or less. The external dimensions of the multilayer capacitor 1 are about 1.6±0.1 mm in length by about 0.8±0.1 mm in width by about 0.8±0.1 mm in thickness.
摘要翻译：层叠电容器包括：电容器体，其中第一内部电极组中的内部电极与内部电极重叠在第二内部电极组中，其间夹有电介质层。第一外部电极具有第一环绕部分和第二环绕部分，第二外部电极具有第三环绕部分和第四环绕部分。被夹在第一环绕部分和第二环绕部分之间的第一区域和夹在第三环绕部分和第四环绕部分之间的第三区域中的有效层的体积比例设定为至少约10％。在第二区域中的有效层向第一区域中的下表面和第三区域中朝向下表面的第四区域中的有效层的体积比例设定为约15％以下。多层电容器1的外形尺寸约为1.6±0.1mm，宽度约为0.8±0.1mm，厚度约为0.8±0.1mm。

3. 发明授权

US07859822B2 Monolithic ceramic capacitor 有权
标题翻译：单片陶瓷电容器
公开(公告)号：US07859822B2
公开(公告)日：2010-12-28
申请号：US11889556
申请日：2007-08-14
申请人： Makito Nakano , Akira Saito
发明人： Makito Nakano , Akira Saito
IPC分类号： H01G4/06 , H01G4/005
CPC分类号： H01G4/06 , H01G4/1218 , H01G4/30
摘要： A capacitor body includes a capacitance-forming section including an alternately arranged plurality of internal electrodes and plurality of dielectric ceramic layers and outer layer sections disposed on the upper or lower face of the capacitance-forming section (28). The outer layer sections include an outermost layer and a second layer (31) inwardly located therefrom. The second layer has a thermal expansion coefficient greater than that of the outermost layer by 1×10−6/° C. to 3×10−6/° C. The outermost layer has a thickness of 50 to 80 μm. The second layer has a thickness of 20 to 50 μm. The arrangement prevents cracks from being formed in a monolithic ceramic capacitor when external electrodes are formed by baking and cooling, and cracks caused by fatigue failure due to low-stress cycles such as heat cycles are prevented from reaching internal electrodes.
摘要翻译：电容器本体包括电容形成部，该电容形成部包括交替排列的多个内部电极和多个电介质陶瓷层，以及设置在电容形成部（28）的上表面或下表面上的外层部。外层部分包括最外层和从其向内定位的第二层（31）。第二层的热膨胀系数比最外层的热膨胀系数大1×10 -6 /℃〜3×10 -6 /℃。最外层的厚度为50〜80μm。第二层的厚度为20〜50μm。通过烧结和冷却形成外部电极，能够防止在单片陶瓷电容器中形成裂纹，并且防止由于诸如热循环的低应力循环引起的疲劳破坏引起的裂纹到达内部电极。

4. 发明授权

US07715171B2 Multilayer ceramic capacitor 有权
标题翻译：多层陶瓷电容器
公开(公告)号：US07715171B2
公开(公告)日：2010-05-11
申请号：US12022722
申请日：2008-01-30
申请人： Makito Nakano , Noriyuki Inoue , Kenichi Kawasaki
发明人： Makito Nakano , Noriyuki Inoue , Kenichi Kawasaki
IPC分类号： H01G4/005 , H01G4/06
CPC分类号： H01G4/012 , H01G4/232 , H01G4/30
摘要： The “squeal” that occurs when an electric field is applied to a multilayer ceramic capacitor mounted on a substrate is suppressed by providing in an active part contributing to formation of capacitances between internal electrodes facing each other in a capacitor body, low-activity regions positioned near respective end edges of respective external electrodes. A facing area of the internal electrodes in the low-activity regions is less than or equal to one fifth that of the internal electrodes in a normal region having the same volume as that of the low-activity regions. This makes it possible to suppress occurrence of electric-field-induced distortion near the external electrodes bonded to a substrate and reduce the force that causes the substrate to bend.
摘要翻译：通过在电容器主体中设置有助于形成彼此面对的内部电极之间的电容的有源部分来抑制电场施加到安装在基板上的多层陶瓷电容器时发生的“尖叫”，位于靠近相应的外部电极的端部边缘。在低活性区域内的内部电极的面对面积小于或等于具有与低活性区域相同体积的正常区域内部电极的面积的五分之一。这使得可以抑制结合到衬底的外部电极附近的电场诱发变形的发生，并且减小引起衬底弯曲的力。

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