Murata Manufacturing Co., Ltd.

Kazuyuki Kubota

Osamu Yamaoka

Shigeki Nishiyama

Kazuhiro Yoshida

Nobushige Moriwaki

Takeshi Azumi

Hirohisa Yamada

Masahiro Nishio

Mitsuru Nagashima

Hajime Arakawa

Yasuhiko Kubota

Motoaki Kakio

Yoshihiro Omura

Yoshimasa Azuma

In a method of calculating effective power relating to a capacitor, the waveform of a periodic voltage applied to a capacitor is set. The capacitance of a desired capacitor is input. The waveform of the periodic voltage applied to both ends of the capacitor is subjected to Fourier expansion. More specifically, the periodic voltage is Fourier-expanded in terms of sine and cosine-wave series of high-order frequency components. Further, an effective power consumed by the capacitor is calculated using data regarding temperature characteristics, voltage characteristics and a frequency characteristic of the capacitance and dielectric tangent of the capacitor.

Method of calculating effective power relating to capacitor, method of measuring effective power consumed by capacitor, capacitor selection method, calculation apparatus for calculating effective power relating to capacitor, and recording medium storing the calculation program therefor

A ceramic condenser module includes at least one first multi-layered ceramic condenser and at least one second multi-layered ceramic condenser, which are mounted to a front surface and a back surface of a substrate, respectively. When a total surface area of the outside surfaces of the mounted first and second multi-layered ceramic condensers excluding surfaces thereof opposing the substrate is defined as S , and a total equal to S and a surface area of the outside surface of the substrate excluding the area covered by the first and second multi-layered ceramic condensers is defined as S , S is equal to or greater than about 1.3 times S . With this arrangement, the ceramic condenser module is suitable for use with large amounts of current, has excellent heat-dissipation effect, is much smaller and much less expensive.

Ceramic condenser module

An inverter capacitor module includes a plurality of substrates having a plurality of ceramic capacitors provided on the top surfaces thereof, and first and second feeding unit lands having conductive films provided on both surfaces thereof and arranged to feed the plurality of ceramic capacitors, the first and second feeding unit lands on both surfaces thereof being electrically connected to each other, a conductive spacer inserted between the plurality of substrates for establishing one of an electrical connection between the first feeding unit lands of an underlying substrate and its overlying substrate and an electrical connection between the second feeding unit lands of an underlying substrate and its overlying substrate, a fixing member arranged to fix the plurality of substrates laminated via the conductive spacer, and a switching module fixed below the bottom substrate among the plurality of substrates that are laminated. In the inverter capacitance module, the switching module is fixed to the plurality of substrates by the fixing element.

Inverter capacitor module and inverter

Both of the longitudinal dimension L and the widthwise dimension W of a capacitor body are at least four times the thickness-wise dimension T, respectively. Preferably, the widthwise dimension W of the capacitor body is greater than the longitudinal dimension L.

Monolithic ceramic electronic component

A high-voltage capacitor is not deteriorated by any of a laser medium gas, ultraviolet rays, and discharge plasma of a gas laser device. Inside a hermetic casing is stored a capacitor body having an electrode which is connected to an external terminal. The external terminal includes a passageway therein which makes the inside of the hermetic casing communicate with the outside of the hermetic casing. The external terminal is led to the outside of the hermetic casing from the capacitor electrode, and gas inside the hermetic casing is discharged through the passageway of the external terminal to achieve a reduced pressure. Thereafter, the inside of the hermetic casing is filled with an insulating protection material. With the hermetic casing being made of alumina and the electrode terminal plated with nickel, deterioration due to ultraviolet rays or discharge plasma generated by an electric discharge of the laser device is prevented, thereby not contaminating the ambient gas.

High-voltage capacitor manufacturing method and high-voltage capacitor

A ceramic capacitor comprising a dielectric ceramic element made of materials a metal oxide as the principal ingredient. On the surface of the dielectric ceramic element are formed a plurality of electrodes. The materials used for the electrode are selected such that their principal ingredients have a stronger oxidizing tendency than those used for the dielectric ceramic element. The electrode is formed by applying this electrode material on the surface of the dielectric ceramic element and subsequently baking in a non-reducing atmosphere. This process reduces the surface of the dielectric ceramic element underneath the electrode and a reduced layer is thus formed.

Growing community of inventors

Izumo, Japan

Kazuyuki Kubota