Murata Manufacturing Co., Ltd.

Murata Mfg. Co., Ltd.

Hiroshi Morii

Takeshi Azumi

Yasuyuki Naito

Yukio Sakabe

Yoshiaki Kohno

Yasunobu Yoneda

Tomoaki Ushiro

Toshio Kawabata

Hiroshi Komatsu

Kenji Ueno

Masahiko Takami

Shigeru Akimoto

Tomio Yamasaki

A vessel drier for producing a powder material, includes a cylindrical container, a heating source, and a plurality of heat conductive members. The cylindrical container has an inner space to contain a fluid raw material and is adapted to rotate along a rotation axis thereof. The heating source is provided outside the cylindrical container to heat the cylindrical container. The heat conductive members are provided at an outer surface of the cylindrical container so as to enlarge the area of the outer surface of the cylindrical container.

Vessel drier having high heat efficiency

A composite electronic part includes a dielectric ceramic portion consisting of a Pb group dielectric material. Inside the dielectric ceramic portion, an internal electrode constituting a portion of a capacitor is formed. The dielectric ceramic portion is bonded to a magnetic ceramic portion consisting of a Ni--Zn group ferrite material by an intermediate layer consisting of a ceramic material containing Pb, Ni, Fe and Nb as main components. Inside the magnetic ceramic portion, an internal electrode constituting a portion of an inductor is formed. Furthermore, at end portions of the dielectric ceramic portion, intermediate layer and magnetic ceramic portion, a plurality of external electrodes consisting of, for example, Ag are formed, and connected to the predetermined internal electrodes.

Composite electronic part

A dielectric ceramic composition for low temperature sintering according to the invention is a composition which is a solid solution having two components of Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 --PbTiO.sub.3 and at least one additive component of Pb(Zn.sub.1/2 W.sub.1/2)O.sub.3 and Pb(Cu.sub.1/3 Nb.sub.2/3)O.sub.3, and the mol percents of the components fall within the following ranges: Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 75.0-85.0; PbTiO.sub.3 0-15.0; at least one of Pb(Zn.sub.1/2 W.sub.1/2)O.sub.3 and Pb(Cu.sub.1/3 Nb.sub.2/3)O.sub.3 5.0-16.5. Further, at least one of oxides of Mn, Mg, and Ca below 0.5 mol percent may be added to the above composite.

Dielectric ceramic composition for low temperature sintering

A method of designing a .pi. type LC filter includes laminating dielectric layers on top and bottom sections of a magnetic material layer, forming a first external electrode and a second external electrode on each end of the laminated body, forming a third external electrode at a center section of the laminated body, forming an inductor by at least one conductor line within the magnetic material layer, connecting one end of the conductor line to the first external electrode and the other end thereof to the second external electrode, and forming a first capacitor composed of a parallel capacitor electrode within the top dielectric layer. One of the parallel capacitor electrodes is connected to the first external electrode and the other is connected to the third external electrode. Additionally, a second capacitor is formed composed of a pair of parallel capacitor electrodes within the bottom dielectric layer. One of the parallel capacitor electrodes is connected to the second external electrode and the other to the third external electrode. The .pi. type LC filter is mounted on a substrate having at least three electrodes wherein first and second lead inductance components L.sub.1 and L.sub.2 are formed. The external electrodes and capacitor electrodes are shaped and sized such that a ratio .alpha. (L.sub.1 /L.sub.2 or L.sub.2 /L.sub.1) is greater than or equal to 1.2 and less than or equal to 2.3.

Designing method of .pi. type LC filter

A unitary composite electronic component having both a filter function and a surge voltage absorption function is arranged to have a varistor laminated body laid on top of an inductor laminated body and a capacitor laminated body, or at least one of them, and is baked so as to be integral in order to construct a laminated body. The unbaked varistor laminated body is provided with varistor electrodes, and the unbaked inductor laminated body is provided with an inductor conductive line and the unbaked capacitor laminated body is provided with capacitor electrodes, respectively. The above-described laminated body is provided at the sides thereof with external electrodes for properly connecting the above-described varistor electrodes with the inductor conductive line and the capacitor electrodes to obtain a composite electronic component having both a filter function and a surge voltage absorption function.

Composite electronic component

An LC filter comprises a ceramic laminate which has at least one dielectric part defining an exposed surface and at least one magnetic part integrated with the dielectric part in a layered manner. The ceramic laminate is provided with at least one through hole which has a first opening positioned on the exposed surface of the dielectric part and commonly passes through both of the dielectric part and the magnetic part. A connector pin is inserted in the through hole while a first electrode of a capacitor is formed on the exposed surface in a peripheral region of the first opening to be electrically connected with the connector pin. A second electrode of the capacitor is provided to be opposite to the first electrode through a dielectric member forming the dielectric part except for a peripheral region of the through hole, so that the second electrode is extracted toward the exterior of the ceramic laminate as a grounded electrode.

LC filter structure

An LC composite component comprises a laminated structure which is formed by stacking first and second inductor layers while holding a capacitor layer between the same. The first and second inductor layers comprise magnetic members and conductor lines formed inside the magnetic members respectively. The capacitor layer comprises a dielectric member and first and second internal electrodes which are provided within the dielectric member to be opposite to each other. First and second external electrodes are provided on first and second opposite end surfaces of the laminated structure, while a third external electrode is formed on at least one of first and second opposite side surfaces. First ends of the conductor lines provided in the first and second inductor layers are connected to the first and second external electrodes respectively, while second ends of the conductor lines are electrically connected with each other through the second internal electrode provided in the capacitor layer. The first internal electrode provided in the capacitor layer is electrically connected with the third external electrode. Thus, obtained is an LC composite component which has two inductors interposed in signal lines and a capacitor formed across the junction between the inductors and the ground, to be employed as a noise filter.

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Nagaokakyo, Japan

Hiroshi Morii