Murata Manufacturing Co., Ltd.

Takahiro Yamamoto

Tadashi Morimoto

Takashi Shikama

Hiroshi Komatsu

Masayoshi Katsube

Masami Yabuuchi

Yoichiro Ito

Hiroshi Tanaka

Hiroshi Seno

Masahiko Takami

Masami Sugitani

Hisato Oshima

Toshio Kawabata

Eiichi Maeda

Yasushi Saito

Hajime Arakawa

Yoshitsugu Yamada

Miyuki Hirase

Kuniaki Fujimoto

An ultrasonic sensor includes a case, a piezoelectric element, and two weight portions. The case includes a circumferential wall portion extending in an axial direction. The two weight portions are provided on the circumferential wall portion outside the case so as not to overlap each other as seen in the axial direction. When a bottom portion of the ultrasonic sensor bends toward one side in the axial direction during vibration at a frequency of a first vibration mode, the two weight portions incline toward the other side in the axial direction. When the bottom portion bends toward one side in the axial direction during vibration at a frequency of a second vibration mode, the two weight portions incline toward one side in the axial direction.

Ultrasonic sensor

A laminated coil component includes a coil conductor including a plurality of strip electrodes and via-holes inside an approximately rectangular ceramic laminate. The via-holes connect the ends of the strip electrodes. The axis of the coil conductor corresponds with the width direction Z of the ceramic laminate that is substantially perpendicular to both the laminated direction (thickness direction) X and the longitudinal direction Y of the ceramic laminate. The manufacturing process includes the steps of laminating ceramic green sheets having the strip electrodes and/or the via-holes and the ceramic green sheets having printed conductive patterns constituting external electrodes, and press-bonding and firing them.

Multilayer coil component and its manufacturing method

A laminated coil is constructed such that an inner space of each via hole can be increased while the spacing between adjacent via holes in the axial direction of a coil is prevented from being narrowed. In the via holes of the laminated coil, through-holes formed in ceramic layers and filled with a conductor are arranged in a row in the lamination direction X, and, in each of the through-holes, the difference between the diameter in the axial direction of the coil on the opening surface of one opening of a ceramic layer and the diameter in the axial direction of the coil on the opening surface of the other opening is smaller than the difference between the diameter in the direction Z that is substantially perpendicular to the axial direction Y of the coil on the opening surface of one opening of the ceramic layer and the diameter in the direction Z that is substantially perpendicular to the axial direction Y of the coil on the opening surface of the other opening.

Laminated coil component and method of producing the same

A laminated coil component includes an inner ceramic green sheet having a plurality of conductive coil patterns, a conductive lead pattern, and interlayer-connecting via holes; inner ceramic green sheets having interlayer-connecting via holes; an inner ceramic green sheet having a plurality of conductive coil patterns and a conductive lead pattern, and outer ceramic green sheets. The outer layers include three or more outer ceramic green sheets having a thickness that is less than that of the inner ceramic green sheets.

Multilayer ceramic electronic component, multilayer coil component and process for producing multilayer ceramic electronic component

A method of producing a chip inductor including the steps of inserting a conductive wire made of a metallic wire into a metallic mold, supporting both end portions of the conductive wire on support portions provided on inner surfaces of the metallic mold so as to position the conductive wire in the approximate center portion of the metallic mold, casting magnetic ceramic slurry into the metallic mold, molding the ceramic slurry case in the metallic mold by wet pressing to obtain a molding body having the conductive wire embedded therein, firing the molding body, and forming external electrodes on both end surfaces of the fired magnetic core such that the external electrodes are connected to both end portions of the conductive wire.

Method of producing chip inductor

A plurality of feedthrough holes are efficiently formed on the present invention by splitting a laser beam emitted from a laser source into plural laser beams by allowing the beam to pass through a diffraction grating, followed by simultaneously forming a plurality of the feedthrough holes on the ceramic green sheet by irradiating the ceramic green sheet with the split laser beam.

Method for machining ceramic green sheet

An method of manufacturing an inductor having a large current capacity which includes a magnetic sintered body formed via wet pressing treatment and a coil assembly disposed within the magnetic sintered body. The coil assembly is defined by a substantially cylindrical magnetic core member which is wound by a coil. Both ends of the coil of the coil assembly are respectively and electrically connected to an input electrode and an output electrode which are respectively disposed on two mutually facing end surfaces of the magnetic sintered body.

Methods of manufacturing inductors

A processing method for a ceramic green sheet and a laser beam machine used therefor, which can efficiently form a plurality of penetration holes having a desired shape and dimension at predetermined locations of the ceramic green sheet, are provided. By performing the steps of dividing a shaped laser beam into a plurality of laser beams by passing through a diffraction grating in order that an energy of the individual zero order diffracted beam becomes equivalent to, or less than, the threshold value for processing the ceramic green sheet, reflecting the divided laser beams with a galvanomirror, converging the reflected laser beams with an converging lens and radiating the laser beams to the ceramic green sheet, the ceramic green sheet is prevented from being processed by the zero order diffracted beam and the higher order diffracted beam so as to simultaneously form a plurality of penetration holes having a desired shape and dimension.

Method for processing ceramic green sheet and laser beam machine used therefor

A method for producing an inductor having an internal conductor includes coating an internal conductor with a covering material, placing the internal conductor coated with the covering material in a shaping mold, and filling a material around the internal conductor so as to form a compact unbaked chip element with the internal conductor provided at a predetermined position. The unbaked chip element is then baked in order to eliminate the covering material so as to form a gap around the internal conductor.

Method for producing an inductor

A processing method for a ceramic green sheet and a laser beam machine used therefor, which can efficiently. form a plurality of penetration holes having a desired shape and dimension at predetermined locations of the ceramic green sheet, are provided. By performing the steps of dividing a shaped laser beam into a plurality of laser beams by passing through a diffraction grating in order that an energy of the individual zero order diffracted beam becomes equivalent to, or less than, the threshold value for processing the ceramic green sheet, reflecting the divided laser beams with a galvanomirror, converging the reflected laser beams with an converging lens and radiating the laser beams to the ceramic green sheet, the ceramic green sheet is prevented from being processed by the zero order diffracted beam and the higher order diffracted beam so as to simultaneously form a plurality of penetration holes having a desired shape and dimension.

A ceramic inductor component and a composite component are provided having desired properties, superior stability of properties and superior durability. When Ni&mdash;Cu&mdash;Zn ferrite or Ni&mdash;Cu ferrite is used for a magnetic ceramic body constituting an inductor portion, and when the contents of S, Cl and Na contained in the ferrite are set to be in the ranges of about 5 to 150 ppm, about 5 to 150 ppm and about 5 to 100 ppm, respectively, diffusion of an internal conductive metal primarily composed of Ag into the magnetic ceramic body is suppressed, and hence, the degradation of electric properties can be avoided. Accordingly, by facilitating sintering, the insulating resistance of the ceramic is improved, and the durability and reliability of the ceramic inductor component can be improved.

Ceramic inductor component and composite component using same

A mask is mounted on one surface of a ceramic green sheet which is supported on an X-Y table. The mask is provided with a plurality of through hole transmissive portions. A pulsed laser beam is applied to the mask. The size of the laser beam is sufficiently large to encompass at least several of said through hole transmissive portions. The laser beam passes through the through hole transmissive portions and simultaneously forms a plurality of through holes in the ceramic green sheet. Because the mask is located on (or at least substantially adjacent) the surface of the ceramic green sheet, the size and shape of the through holes will be approximately identical to the size and shape of the through hole transmissive portions, thereby precisely controlling the size and shape of the through holes. The mask can be irradiated while the ceramic green sheet is moving.

Method for forming a through hole in a ceramic green sheet

An inductor includes a coiled metal wire, an insulating molded member in which the coiled metal wire is embedded, and metal caps fitted on both ends of the insulating molded member. The metal caps are welded to both ends of the coiled metal wire. Between the metal caps and the end surfaces of the insulating molded member, spaces are defined respectively. The insulating molded member is made of, for example, resin or rubber.

Inductor and method of manufacturing same

A mask is mounted on one surface of a ceramic green sheet which is supported on an X-Y table. The mask is provided with a plurality of through hole transmissive portions. A pulsed laser beam is applied to the mask. The size of the laser beam is sufficiently large to encompass at least several of said through hole transmissive portions. The laser beam passes through the through hole transmissive portions and simultaneously forms a plurality of through holes in the ceramic green sheet. Because the mask is located on (or at least substantially adjacent) the surface of the ceramic green sheet, the size and shape of the through holes will be approximately identical to the size and shape of the through hole transmissive portions, thereby precisely controlling the size and shape of the through holes. A preferred laser processing apparatus used in this processing method has a laser source, a laser-source driving circuit for driving the laser source, a table for holding an object having a mask disposed thereon, a galvanomirror directed to the table, a galvanomirror driving circuit for changing the reflection angle of the galvanomirror, a control circuit for sending control signals to the laser-source driving circuit and the galvanomirror driving circuit, and a converging lens disposed between the laser source and the mask so as to converge a laser beam emitted from the laser source.

Method and apparatus for forming a through hole in a ceramic green sheet

The present invention provides a system and method for producing a reliable inductor having an internal conductor with a small electric resistance. A metal wire formed in a nonlinear shape is used as the internal conductor. In an exemplary embodiment of the invention, the internal conductor has a coil-like shape with portions adjacent to each other with respect to the axial direction of the coil being positioned in a substantially cylindrical gap formed in the axial direction of the coil. By providing a gap around the internal conductor, stress between the internal conductor and a ceramic material surrounding the conductor can be eliminated. As a result, the characteristic deterioration or crack generation in the inductor chip is eliminated. Moreover, the leakage flux among the coil pitches of the conductor is reduced, thereby improving the characteristics of the inductor.

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Omihachiman, Japan

Takahiro Yamamoto