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    • 53. 发明授权
    • Multilayer ceramic capacitor and method for the manufacture thereof
    • 多层陶瓷电容器及其制造方法
    • US06614644B2
    • 2003-09-02
    • US09785064
    • 2001-02-15
    • Hirokazu ChazonoHisamitsu ShizunoHiroshi Kishi
    • Hirokazu ChazonoHisamitsu ShizunoHiroshi Kishi
    • H01G406
    • H01G4/1209
    • A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved. As a result, the thickness of dielectric layers can be further reduced and a greater number of dielectric layers can be used in forming multilayer ceramic capacitors, enabling miniaturization and large capacitance thereof to be achieved.
    • 多层陶瓷电容器包括具有交替层叠有多个内部电极的多个电介质层和电连接到内部电极的一对外部电极的烧结层叠体。 电介质层是烧结陶瓷晶粒。 陶瓷颗粒包括由壳部分或固溶体包围的芯部分。 陶瓷颗粒含有添加元素,例如受主元素和/或稀土元素。 添加剂元素不均匀地分布在陶瓷颗粒的芯部和/或壳部分或固体溶液中。 添加元素在陶瓷颗粒中的这种不均匀分布促进或促进了陶瓷颗粒的再氧化过程,并且还增加了其电阻。 因此,可以提高多层陶瓷电容器的使用寿命特性,特别是那些结合有薄介电层的陶瓷电容器。 结果,可以进一步减小电介质层的厚度,并且可以在形成多层陶瓷电容器中使用更多数量的电介质层,从而实现小型化和大的电容。
    • 59. 发明授权
    • Low temperature sintered ceramic capacitor with a temperature
compensating capability, and method of manufacture
    • 具有温度补偿能力的低温烧结陶瓷电容器及其制造方法
    • US4700268A
    • 1987-10-13
    • US945360
    • 1986-12-22
    • Hirokazu ChazonoHiroshi KishiShunji MuraiMasami FukuiTakeshi Wada
    • Hirokazu ChazonoHiroshi KishiShunji MuraiMasami FukuiTakeshi Wada
    • H01G4/30C04B35/47C04B35/49H01B3/12H01G4/12C04B35/46
    • C04B35/49C04B35/47H01G4/1245
    • A temperature compensating capacitor of monolithic or multilayered configuration comprising a dielectric ceramic body and at least two electrodes buried therein. The ceramic body is composed of a major ingredent expressed by the formula, {(Sr.sub.1-x Ca.sub.x)O}.sub.k (Ti.sub.1-y Zr.sub.y)O.sub.2, where x, k and y are numerals in the ranges of 0.005 to 0.995 inclusive, 1.00 to 1.04 inclusive, and 0.005 to 0.100 inclusive, respectively. To this major ingredient is added a minor proportion of a mixture of boric oxide, silicon dioxide, and one or more metal oxides selected from among barium oxide, magnesium oxide, zinc oxide, strontium oxide and calcium oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere and then are reheated at a lower temperature in an oxidative atmosphere. The cosintering temperature can be so low that nickel or like base metal can be employed as the electrode material.
    • 一种单片或多层结构的温度补偿电容器,包括介电陶瓷体和埋在其中的至少两个电极。 陶瓷体由以下公式表示的主要成分{(Sr1-xCax)O} k(Ti1-yZry)O2)组成,其中x,k和y为0.005-0.995(含)范围内的数字,1.00至1.04 分别为0.005〜0.100。 添加少量的氧化硼,二氧化硅和一种或多种选自氧化钡,氧化镁,氧化锌,氧化锶和氧化钙的金属氧化物的混合物。 为了制造电容器,将上述主要成分和细分散形式的添加剂的混合物形成为所需形状和尺寸的模制品,其中至少埋设有两个电极。 模制品和电极在还原或中性气氛中共烧结,然后在较低温度下在氧化气氛中再加热。 整个烧结温度可以低到可以使用镍或类似的贱金属作为电极材料。
    • 60. 发明授权
    • Low temperature sintered ceramic capacitor with high DC breakdown
voltage, and method of manufacture
    • 具有高直流击穿电压的低温烧结陶瓷电容器及其制造方法
    • US4607314A
    • 1986-08-19
    • US805096
    • 1985-12-04
    • Takeshi WadaHiroshi KishiShunji MuraiMasami Fukui
    • Takeshi WadaHiroshi KishiShunji MuraiMasami Fukui
    • C04B35/49C04B35/46C04B35/468H01B3/12H01G4/12H01G4/30H01G1/005H01G4/06
    • C04B35/4682H01G4/1245
    • A monolithic ceramic capacitor having a higher DC breakdown voltage per unit thickness of the dielectric ceramic body than heretofore. The major ingredient of the ceramic is expressed as {(Ba.sub.1-x-y Ca.sub.x Sr.sub.y)O}.sub.k (Ti.sub.1-z Zr.sub.z)O.sub.2, where x, y, z and k are numerals in the ranges specified herein. To this major ingredient is added a minor proportion of a mixture of boric oxide, silicon dioxide and at least one metal oxide selected from among BaO, SrO and CaO, in specified ranges of proportions. For the fabrication of capacitors having dielectric bodies of the above composition, the moldings of the mixture of the major ingredient and additives in the specified proportions are sintered to maturity in a reductive or neutral atmosphere and then reheated at a lower temperature in an oxidative atmosphere. The sintering temperature can be so low (1000.degree.-1200.degree. C.) that the moldings can be cosintered with base metal electrodes buried therein.
    • 一种单片陶瓷电容器,其电介质陶瓷体的单位厚度的直流击穿电压高于迄今为止。 陶瓷的主要成分表示为{(Ba1-x-yCaxSry)O} k(Ti1-zZrz)O2,其中x,y,z和k是本文所指定范围内的数字。 在规定的比例范围内,向该主要成分添加少量比例的氧化硼,二氧化硅和至少一种选自BaO,SrO和CaO的金属氧化物的混合物。 为了制造具有上述组成的电介质体的电容器,将主要成分和特定比例的添加剂的混合物的模制品在还原性或中性气氛中烧结成熟,然后在较低温度下在氧化气氛中再加热。 烧结温度可以如此低(1000°-1200℃),模制品可以与埋在其中的贱金属电极共烧结。