Kyocera Corporation

Hiromi Iwachi

Yoshitake Terashi

Katsura Hayashi

Shinya Kawai

Yuji Iino

Tsutae Iryo

Ceramics containing a diopside crystal phase and a cordierite phase, the remainder being a glass phase and/or other ceramic crystal phases, and having an open porosity of not larger than 1%. The ceramics is obtained by firing at from 800 to 1050&deg; C., and exhibits a dielectric constant of not larger than 7 and a small dielectric loss in a high-frequency region, a ceramic strength of not smaller than 250 MPa, and a coefficient of thermal expansion close to those of the chips such as of Si and Ga&mdash;As and of the printed board.

Ceramics and method of preparing the same

The porcelain of the present invention comprises 5 to 70% by weight of a non-oxide ceramic filler and 30 to 95% by weight of a borosilicate glass having a glass transition temperature of 800&deg; C. or lower, wherein a weight loss per unit surface area of said non-oxide ceramics is not more than 0.15 g/cm after dipping said non-oxide ceramic having purity of not less than 96% by weight for five minutes in a glass melt obtained by melting said borosilicate glass with heating at 1200&deg; C. Since the porcelain composition can be fired at a low temperature together with a low-resistance metal, the resulting porcelain has a high thermal conductivity, a low dielectric constant, a high heat dissipation property and a reduced apparent signal delay in a high frequency signal and is suited for use as an insulating board in a wiring board.

Porcelain composition, porcelain and method of producing the same, and wiring board and method of producing the same

A wiring board that incorporates electric element such as capacitor. The wiring board includes a dielectric substrate having electronic components mounting surface on the surface thereof, an electric element that is embedded in the dielectric substrate, a first conductive layer and a second conductive layer formed inside of the dielectric substrate, and via hole conductors that connect the first terminal electrode and the second terminal electrode of the electric element to the first conductive layer and the second conductive layer, respectively, and extend the surface of the dielectric substrate from the first and second conductive layers. In case both the first and the second terminal electrodes are provided in plurality, all of the plurality of first terminal electrodes are connected to the first conductive layer through the via hole conductors and all of the plurality of second terminal electrodes are connected to the second conductive layer through the via hole conductors.

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Kagoshima, Japan

Hiromi Iwachi