Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Ryuichi Saito

Hidenori Katsumura

Hiroshi Kagata

Masahiro Hiraka

Osamu Shibata

Yoshihiro Tomura

Toshiyuki Kojima

Hiroshi Kushitani

Suzushi Kimura

Naoki Yuda

Masaaki Katsumata

Hidefumi Saeki

Masayoshi Koyama

Yoshitake Hayashi

Yoshitaka Sunagawa

Michihisa Sanda

Shigeo Hurukawa

Koichi Shigeno

Muneyuki Sawada

The present invention relates to a ceramic laminated device including a dielectric ceramic and an Ag electrode. In a dielectric ceramic that can be sintered at low temperatures and has a high dielectric constant and Q value, reactivity between the ceramic and Ag during sintering is suppressed low and segregation of specific elements in the proximity of the electrode is controlled. Thus, a filter having a high Q value and low loss is produced stably. For this purpose, in a ceramic laminated body including at least a ceramic and a Si-containing glass, a ratio of A/B, i.e. a ratio of a Si element concentration (A) within a range at a distance of 5 &#x3bc;m or smaller from the Ag electrode to a Si element concentration (B) within a range at a distance larger than 5 &#x3bc;m from the Ag electrode, is set equal to or smaller than 2.

Ceramic laminated device and method for manufacturing same

A dielectric porcelain composition of the present invention includes a first component and second component. If the first component is represented by the general formula of xBaO-yNdO-zTiO-wBiO(provided that x+y+z+w=100), x, y, z, and w satisfy 12&#x2266;x&#x2266;16, 12&#x2266;y&#x2266;16, 65&#x2266;z&#x2266;69, and 2&#x2266;w&#x2266;5, respectively. The second component includes 30 to 37 wt % of BaO, 33 to 46 wt % of SiO, 8 to 12 wt % of LaO, 3 to 7 wt % of AlO, 0 to 1 wt % of SrO, 0 to 10 wt % of LiO, 0 to 20 wt % of ZnO, and 7 wt % or less of B0. The compounding ratio of the second component is between 10 wt % and 30 wt % when the sum of the first and second components is 100. In addition, 0.1 to 1 parts by weight of LiO and 3 to 10 parts by weight of ZnO, relative to 100 parts by weight of the sum of the first and second components, is also contained as a third component. An average particle diameter of the dielectric mixed powder forming dielectric porcelain composition before firing is 0.9 &#x3bc;m or less.

Dielectric porcelain composition and high frequency device using the same

A module includes a ceramic substrate, first and second electrodes provided on the ceramic substrate, a component having third and fourth electrodes connected to the first and second electrodes, respectively, and a resin filled in a space between the component and the ceramic substrate. The ceramic substrate has a surface thereof having a recess formed therein. The first and second electrodes are provided on the surface of the ceramic substrate so that the recess is located between the first and second electrodes. The component is located over the recess and spaced from the ceramic substrate with a space including the recess. The space including the recess is filled with the resin. The module allows each component to be surface mounted at higher bonding strength, thus preventing short-circuit between the electrodes on the substrate and improving the operation reliability.

Method of manufacturing a module

A ceramic green sheet is irradiated with a laser beam of a high-peak short-pulse type to form a hole in the sheet. With the laser beam, a minimum oscillation output is more than 60% of a maximum oscillation output. This prevents material of the ceramic green sheet from melting partially and remaining around the hole. Therefore, a multi-layer assembly of ceramic green sheets built by joining the sheets in layers and baking these joined sheets hardly has a structural defect around a via-electrode provided in the hole.

Method of making hole in ceramic green sheet

A dielectric ceramics includes a main ingredient, and a supplemental ingredient in an amount of 0.05 to 2 wt % for the main ingredient. The main ingredient is expressed by xBiO-yCaO-zNbOand is within a scope of a specified quadrilateral region in a ternary system diagram, and the supplemental ingredient is a glass composition including at least SiO, LiO and MO (M includes at least one of Ca, Sr and Ba). A ceramic electronic component is produced by co-firing a dielectric layer composed of the dielectric ceramics and a conductive layer mainly composed of silver, and has a low degradation in Q value and excellent microwave characteristics.

Dielectric ceramic composition and ceramic electronic component employing the same

A multilayer ceramic substrate includes a glass ceramic body, a conductive pattern, and a via conductor. The conductive pattern is formed in the glass ceramic body and on at least one principal surface of the glass ceramic body. The via conductor makes a connection between the predetermined conductive patterns. The via conductor includes a conductive material and a Mo compound or a Mo metal. The conductive material includes at least one selected from the group consisting of Ag, Au, Pt and Pd as a main component. The amount of Mo compound or Mo metal is in the range of 0.05 to 10 parts by weight in terms of Mo metal with respect to 100 parts by weight of the conductive material. This multilayer ceramic substrate can achieve sufficient flatness and high dimensional accuracy, while preventing defects that occurs in the vicinity of electrodes after firing.

Multilayer ceramic substrate and method for manufacturing the same

A multilayer LC composite component includes a glass-ceramic composition and internal electrodes containing silver or copper as a main component. The multilayer LC composite component is outstanding in mounting reliability particularly to a resin substrate, easy to manufacture, and has excellent electric characteristics at high frequency. The glass-ceramic composition includes 45 to 35 wt. % of forsterite powder and 55 to 65 wt. % of glass composite powder, and compositions of the glass composite powder include 40 to 50 wt. % of SiO , 30 to 40 wt. % of BaO, 3 to 8 wt. % of Al O , 8 to 12 wt. % of La O , and 3 to 6 wt. % of B O . It is high in flexural strength, moderately high in coefficient of thermal expansion, easy to use in manufacturing a greensheet, and densely sintered at a temperature of less than 950 degrees C.

Glass-ceramic composition, and electronic component and multilayer LC composite component using the same

Method for fabricating semiconductor-mounting body and apparatus for fabricating semiconductor-mounting body

A diplexer employed in mobile communications equipment such mobile phones which can divide signals into two channels with a simple configuration without interfering the other band. In this diplexer, an inductor is connected between a &pgr;-type three-stage one polar low-pass filter and a common terminal as a first matching circuit, and a capacitor A is connected between a one polar band-pass filter and a common terminal as a second matching circuit so that interference with the other band can be prevented and the higher harmonics can be sufficiently attenuated with simple configuration.

Growing community of inventors

Osaka, Japan

Ryuichi Saito