Murata Manufacturing Co., Ltd.

Yoshiaki Kohno

Harunobu Sano

Nobuyuki Wada

Noriyuki Kubodera

Yukio Sakabe

Yasuyuki Naito

Takeshi Azumi

Mitsuru Sube

Norio Sakai

Nagato Omori

Hiroshi Morii

Hiroyuki Kawakami

Tatsuya Suzuki

Hiroshi Nakatani

Masami Yamaguchi

Takao Hosokawa

Shozo Kojima

Haruhumi Mandai

Toshiaki Kaji

Shozo Ohtera

Syunsuke Nakaya

Tatsuru Takaoka

Yasuto Inagaki

Masataka Kida

Kunitaro Nishimura

Shunsuke Nakaya

Masato Yabuuchi

Akinobu Takamura

Akihito Okuda

Horishi Morii

Kouichi Yagi

A command signal generated by a command generation part is commonly used among a plurality of comparator circuits. On the other hand, a threshold at each comparator circuit is configured to be able to be set individually in accordance with external setting, and thus a drive start timing of each element constituting an actuator array can be set flexibly.

Plural actuator system and control method thereof

A method of manufacturing a piezoelectric component in which an internal electrode and a dummy electrode are printed on a green sheet and a floating electrode is printed on a green sheet. A plurality of green sheets, each having the internal electrode and the dummy electrode printed thereon, and the green sheet on which the floating electrode is printed are stacked to obtain a layered product in which at least one floating electrode layer is arranged in at least one of the green sheets between the adjacent internal electrodes in the stacking direction and/or the green sheets outside the outermost internal electrodes in the stacking direction, a plurality of the internal electrodes are extended to opposite first and second sides alternately in the thickness direction, and the dummy electrode is arranged between an end of the internal electrode opposite to the side extended to one of the sides and the other side to which the internal electrode is not extended. The layered product is then fired to obtain a sintered ceramic compact body. First and second external electrodes are respectively formed on the first and second sides of the sintered ceramic compact body, and a DC electric field is applied between the first and second external electrodes to polarize the sintered ceramic compact body.

Method of manufacturing multilayer piezoelectric component

A method of manufacturing a multilayer piezoelectric component includes the step of providing a compact and sintered ceramic body including a piezoelectric ceramic material and having opposite first and second sides. First and second external electrodes are respectively provided on the first and second sides of the compact ceramic sintered body. A plurality of internal electrodes are stacked in the ceramic sintered body so as to overlap each other with ceramic layers disposed therebetween in the thickness direction. The internal electrodes are arranged to be electrically connected to the first or second external electrode. A dummy electrode is provided between an end of at least one of the internal electrodes opposite to the end connected to one of the external electrodes, and the other external electrode not connected to the at least one internal electrode at the height where the at least one internal electrode is located. The dummy electrode suppresses diffusion of an internal electrode constituent metal from the internal electrodes to the dummy electrode side.

Method of manufacturing a multilayer piezoelectric component

A highly sensitive sensor array can be easily manufactured. An ultrasonic probe as the sensor array used in an ultrasonic diagnostic apparatus includes a substrate formed of a backing member. On a main surface of the substrate, a plurality of piezoelectric oscillators is fixed in a matrix form. Each of the piezoelectric oscillators includes a plurality of laminated piezoelectric layers. Between the piezoelectric layers, inner electrodes are formed. On each end face of the piezoelectric layers, an outer electrode is formed. The piezoelectric oscillators are bonded onto the substrate by adhesive in such a manner that the plurality of piezoelectric layers is laminated in a direction parallel to the main surface of the substrate. On the plurality of piezoelectric oscillators, an acoustic matching layer is formed, and on the acoustic matching layer, an acoustic lens is formed.

Sensor array, method for manufacturing sensor array, and ultrasonic diagnostic apparatus using the same

A piezoelectric ceramic comprising lead titanate as a primary component, wherein the primary component contains a titanium oxide crystalline phase. Methods for producing the ceramic, and piezoelectric oscillators making use of the ceramic are also disclosed.

Piezoelectric ceramic, method for producing piezoelectric ceramic, and piezoelectric oscillator

A multilayer piezoelectric component includes a compact and sintered ceramic body including a piezoelectric ceramic material and having opposite first and second sides. First and second external electrodes are respectively provided on the first and second sides of the compact ceramic sintered body. A plurality of internal electrodes are stacked in the ceramic sintered body so as to overlap each other with ceramic layers disposed therebetween in the thickness direction. The internal electrodes are arranged to be electrically connected to the first or second external electrode. A dummy electrode is provided between an end of at least one of the internal electrodes opposite to the end connected to one of the external electrodes, and the other external electrode not connected to the at least one internal electrode at the height where the at least one internal electrode is located. The dummy electrode suppresses diffusion of an internal electrode constituent metal from the internal electrodes to the dummy electrode side.

Multilayer piezoelectric component

A piezoelectric actuator is constructed to have a displacement value caused by bending to be added to a usual d,component displacement, thereby increasing the total amount of displacement of the actuator. The actuator includes an actuator body having a layered structure of piezoelectric layers and internal electrodes, and external electrodes disposed on an external surface of the actuator body at both ends thereof. One of the outermost piezoelectric layers is made piezoelectrically active as a result of making an extension portion of the first external electrode, through the one of the outermost piezoelectric layers, face the inner electrodes, to have a polarity which is different from that of the extension portion, while a second of outermost piezoelectric layers is made piezoelectrically inactive as a result of either making an extension portion of the second external electrode facing, through the second of the outermost piezoelectric layers, the inner electrodes, to have a polarity which is identical to that of the extension portion of the second external electrode or as a result of not forming an extension portion on the outer electrode.

Piezoelectric actuator

A ceramic multilayer substrate (,) having a built-in inductance includes a conductor (,) which is arranged in a substrate consisting of a sintered body (,), and ferromagnetic metal films (,A,,B) consisting of Ni which are arranged on both sides of the conductor (,).

Electronic component having built-in inductor

A metal thin film having excellent transferability onto a ceramic sheet is provided in order to facilitate formation of an internal electrode for a multilayer ceramic capacitor, for example, by a technique of transferring a metal thin film. A first metal layer (2) of nickel or copper or another metal is formed on a film (1) by vapor deposition, and then a second metal layer (3) of nickel or copper or another metal is formed on the first metal layer (2) by wet plating such as electroplating or electroless plating, thereby providing a metal thin film constituted by the first and second metal layers (2 and 3) having excellent transferability.

Method of preparing metal thin film having excellent transferability

A method of manufacturing a monolithic ceramic electronic device includes the following steps: forming a first metal film on a PET film; forming a multilayered metal film by forming a second metal film on a part of the first metal film, the second metal film being thicker than the first metal film; forming a monolithic ceramic structure including the multilayered metal film; forming the first metal film, which is partially overlain by the second metal film in the monolithic ceramic structure, into an insulating structure in such a manner that metal components forming the first metal film are diffused into the ceramics; and firing the ceramics. Disclosed also is a monolithic ceramic electronic device manufactured by the method. As a result, a stepped portion between a portion in which the internal electrodes overlap one another and a portion in which the internal electrodes do not overlap can be prevented from being formed, and delamination can effectively be prevented, whereby a monolithic ceramic electronic device exhibiting stable characteristics and a method for manufacturing the monolithic ceramic electronic device can be obtained.

Method of manufacturing a monolithic ceramic electronic device

Disclosed herein is a method of manufacturing a multilayer ceramic electronic component by forming external electrodes on a pair of opposite side surfaces of a sintered body (1) obtained by sintering a laminate prepared by stacking a plurality of ceramic green sheets through internal electrodes to be electrically connected with prescribed ones of the internal electrodes. The method of manufacturing a multilayer ceramic electronic component comprises a step of forming the internal electrodes on single major surfaces of the ceramic green sheets by a thin film forming method, a step of electrochemically etching the opposite side surfaces (1a', 1b) of the sintered body (1) for forming gap regions between the internal electrodes and those of the external electrodes which must not be electrically connected with the internal electrodes and a step of filling up clearance portions (A) defined by dissolution/removing of the internal electrodes by the etching with an insulating material.

Method of manufacturing multilayer ceramic electronic component

A capacitor array in which a plurality of inner electrodes are formed so as to be overlapped with each other in the thickness direction while being separated by a ceramic layer in a ceramic sintered body to construct a plurality of capacitor units, and the plurality of capacitor units are separated from each other by a layer having a lower dielectric constant than that of ceramics composing the sintered body.

Capacitor array

A method of manufacturing a layered product to obtain a multilayer ceramic capacitor. A mother sheet supported by a carrier film is cut to obtain respective sheets to form a plurality of sheets. The sheets are transferred to a frame having inner dimensions capable of positioning the sheets inside the frame. The stacked sheets are then pressurized. The arrangement enables the sheets forming the layered product to be stacked for pressurizing without misalignment of internal electrodes embedded in the respective sheets and without air being entrapped between the stacked sheets.

Method of manufacturing multilayer electronic component

A nonreducible dielectric ceramic composition of a system, (A.sub.1-x R.sub.x).sub.y BO.sub.3, is produced using using at least one compound selected from the group consisting of water-soluble inorganic compounds and organic solvent-soluble organometallic compounds of rare earth element R together with oxides and/or carbonates of elements A and B.

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Nagaokakyo, Japan

Yoshiaki Kohno