Matsushita Electric Industrial Co., Ltd.

West Electric Co., Ltd.

Osamu Kawasaki

Katsu Takeda

Takahiro Nishikura

Masanori Sumihara

Katsumi Imada

Katsunori Moritoki

Tetsuro Otsuchi

Kazuo Eda

Keiji Onishi

Yoshihiro Tomita

Yutaka Taguchi

Shun-ichi Seki

Masato Sugimoto

Takashi Nojima

Hiroshi Nakatsuka

Toshiyuki Asahi

Kojiro Okuyama

Akihiko Namba

Hiroki Sato

Tetsuyoshi Ogura

Atsushi Komatsu

Yosihiro Tomita

Toshio Ishizaki

Toru Yamada

Yoshihiro Bessho

Hiroshi Kagata

Junichi Kato

Shigeo Suzuki

Hideki Iwaki

Kouji Kawakita

Tsukasa Shiraishi

Hidenobu Shintaku

Ritsuo Inaba

Tetsuro Ohtsuchi

Masayuki Okano

Yasuteru Asakawa

Hiroshi Iwata

Noboru Nomura

Takeshi Yamaguchi

Hiroaki Kosugi

Koji Ikeda

Ryoichi Takayama

Masahiro Takada

Masayoshi Miura

Yuji Takashima

Eiichiro Tanaka

Tomoki Uwano

Hirofumi Tajika

Masahiro Nagasawa

Yukihiko Ise

Hirotaka Ishihara

Hiroshi Makino

Tetsuyosi Ogura

Wataru Hasegawa

Akira Tokushima

Hiroshi Fukushima

Tetsuji Fukada

Kazuou Murata

Masanori Sumhara

The piezoelectric transformer of the present invention has a piezoelectric element mainly formed of a piezoelectric material, primary electrodes U and D which are formed on the piezoelectric element and to which a voltage is applied, a secondary electrode which is formed on the piezoelectric element and from which a voltage higher than the voltage applied to the primary electrode is output, and a sensor electrode which is formed on the piezoelectric element and from which a voltage lower than the output voltage of the secondary electrode is output.

Piezoelectric transformer, piezoelectric transformer drive circuit, piezoelectric transformer drive method and cold cathode tube drive apparatus using piezoelectric transformer

A method for producing an acceleration sensor comprising an electromechanical transducer having a piezoelectric element includes providing at least two piezoelectric substrates where each has two opposing main surfaces. The piezoelectric element is formed by directly connecting one of the main surfaces of one of the at least two piezoelectric substrates with an opposing one of the main surfaces of another one of the at least two piezoelectric substrates. Supporters are provided to support the electromechanical transducer and are directly connected to the at least two piezoelectric substrates composing the piezoelectric element. Electrodes that extend continuously from the unconnected main surfaces of the at least two piezoelectric substrates composing the piezoelectric element to surfaces of the supporters are then formed.

Method for producing an acceleration sensor

A variable dot ink-jet printer having an ejection flow passage with a decrease in sectional area from an ejection port toward the interior of the flow passage and up to a boundary. A draw-in part draws an ink front position in the interior of the flow passage. A push-out part pushes out the ink front position outside the flow passage. When ejecting a small ink drop, the ink front position is drawn at a place having an increase in sectional area by the draw-in part. The ink is pushed outward by the push-out part at such a speed as to exit from an edge of an area of the boundary on the ejection port side.

Variable dot ink-jet printer

A liquid injection device has a liquid pressurizing chamber having one or a plurality of apertures, a liquid injection port provided at a part of the liquid pressurizing chamber, a liquid pressurizing member arranged adjacent to the liquid pressurizing chamber, a liquid passage arranged adjacent to the liquid pressurizing chamber; wherein within the aperture(s), a peripheral edge portion of the aperture(s) located at a position opposite to the liquid pressurizing member and the liquid pressurizing member are arranged to be apart from each other at a gap with a predetermined size; further wherein liquid is injected through the liquid injection port by driving the liquid pressurizing member to thereby pressurize the liquid supplied from the liquid passage into the liquid pressurizing chamber.

Liquid injection device, manufacturing method therefor, liquid injection method and manufacturing method for piezo-electric actuator

A method and unit for driving a small high-efficiency piezoelectric transformer allowing a cold-cathode tube to have stable luminance by detecting only an active current flowing in the cold-cathode tube based on a phase difference between an output current and voltage of the piezoelectric transformer, removing a reactive current caused by stray capacitance formed between the cold-cathode tube and a reflector, and accurately controlling driving of the piezoelectric transformer so that a constant active current is detected.

Method and unit for driving piezoelectric transformer used for controlling luminance of cold-cathode tube

An ink jet recording apparatus is disclosed, which apparatus has a pressure chamber that holds an ink liquid, and a nozzle communicating with the pressure chamber for discharging the ink liquid when pressure is applied to the pressure chamber. The pressure chamber has a diaphragm disposed therein. A piezoelectric element made of a monocrystalline or polycrystalline piezoelectric member highly oriented along a polarization axis showing perovskite structure, and mainly composed of lead zirconate titanate or barium titanate, is used to vibrate the diaphragm. When a specified voltage is applied to the piezoelectric element, it causes the ink liquid in the pressure chamber to be discharged into a recording medium at the front side of the nozzle.

Ink jet recording apparatus including a pressure chamber and pressure applying means

A liquid jetting apparatus has a concave casing having an opened flat face, and a piezoelectric drive element for at least partly sealing the opened flat face to form a liquid reservoir to store a liquid, such as ink. The reservoir has a liquid injection port for injecting a liquid and a liquid jet port for jetting the stored liquid. The piezoelectric drive element is directly bonded to the open flat face.

Liquid jetting apparatus having a piezoelectric drive element directly bonded to a casing

A head actuator mechanism characterized has a head that records and reproduces data; a suspension that holds the head; a support arm; a drive means for moving the support arm; a coupling section for coupling the support arm and the suspension together in such a way that the head can move relatively to the support arm; and at least one piezoelectric element for coupling the support arm and the suspension together to move the head relatively to the support arm for fine tuning, the piezoelectric element being fixed to the support arm and suspension at both ends.

Head actuator driven by piezoelectric element

A wafer with a reversed domain is prepared for two piezoelectric single crystal plates and of about the same thickness by using direct bonding without any adhesive. Driving electrodes are formed on two principal planes of the wafer with a reversed domain to provide a piezoelectric resonator. A piezoelectric resonator having the structure with a reversed polarization and using odd-order vibration modes vibrating with a fundamental wave has a wavelength of a thickness thereof and suppresses scattering of the thickness of the domains with a reversed polarization. In the direct bonding, the axes of the spontaneous polarization of the two piezoelectric single crystal plates are reverse to each other and crystalline axes other than the axes of polarization are shifted intentionally by an angle other than zero. Thus, spurious modes are suppressed in a simple way.

Piezoelectric resonator and method for fabricating the same

An acceleration sensor has a piezoelectric element which includes a piezoelectric member layer in which a plurality of piezoelectric members are stacked and electrodes which are disposed in major opposed surfaces of the piezoelectric member layer; and a support member for supporting the piezoelectric element, wherein some piezoelectric members of the piezoelectric member layer are polarized. The electrodes are disposed in both surfaces of the polarized piezoelectric members. Capacitors which are formed by the polarized piezoelectric members and the electrodes in both surfaces of the polarized piezoelectric members are connected parallel to each other.

Acceleration sensor

A resonator ladder type surface acoustic wave filter, has an input electrical terminal, an output electrical terminal, and a grounding terminal being formed on a piezoelectric substrate, a series arm surface acoustic wave resonator and a parallel arm surface acoustic wave resonator, each constructed from an interdigital transducer for exciting a surface acoustic wave, being formed between said input electrical terminal and said output electrical terminal, and when the center frequency of said resonator ladder type surface acoustic wave filter is denoted by fc, and capacitance determined by the number of electrode finger pairs and electrode finger overlap width in said interdigital transducer of said parallel arm surface acoustic wave resonator is denoted by Cp (fc: center frequency [GHz], Cp: capacitance of the interdigital transducer of the parallel arm surface acoustic wave resonator), capacitance C of multiples of said parallel arm surface acoustic wave resonator, connected to the same node between said input electrical terminal and said output electrical terminal, always satisfies the relation

Resonator ladder type surface acoustic wave filter

The present invention relates to an electronic part used for mobile communications apparatuses and the like, and more particularly to an electronic part, such as an acoustic surface-wave device, a piezoelectric ceramic device or the like, which requires an oscillation space near the surface of the functional device chip thereof, and a method of production thereof. With this method, a space retainer for forming a sealed space at the functional portion of the chip can be hermetically sealed and have high moisture resistance, and the process of forming the space retainer can be carried out easily. The electronic part of the present invention comprises a functional device chip, a space retainer for forming a sealed space at the functional portion of the chip, a circuit substrate to which the chip is secured, electrode interconnection portions for establishing electric connection between the chip and the circuit substrate, and a sealing resin for covering and sealing at least the space retainer, wherein the space retainer comprises a support layer made of a synthetic resin film, provided with an opening enclosing the functional portion and joined onto the main surface, and a cover formed and joined onto the support layer so as to cover the functional portion and form a sealed space between the cover and the functional portion.

Electronic part and a method of production thereof

A piezoelectric filter is one not changing in the holding position a resonator in spite of impulse, small in the number of parts, easy to assemble from one direction, small, thin, and stable in characteristic. For example, as shown in FIG. 7, on electrode patterns on a package 10 forming wiring electrode patterns 11, holding protrusions 13 for holding resonators, and partition boards 14 for positioning resonators, a rectangular plate type piezoelectric resonators 12 are adhered with conductive adhesive. The rectangular plate type piezoelectric resonators 12 and the package 10 are adhered and reinforced from above with a vibration absorbing member 15, and wiring is formed from above the resonators by wire bonding 16, thereby wiring resonators in a ladder form. Or, as shown in FIG. 11, after forming electrode patterns 102 on a piezoelectric substrate 101, a rectangular plate resonator 104 is cut out from a piezoelectric substrate 101 by laser in a shape consecutive to the piezoelectric substrate 101 by the node of the length expander mode, and the piezoelectric substrate 101 is enclosed by a spacer 106 and a sheet 107 from above and beneath.

Piezoelectric filter, its manufacturing method, and intermediate

Growing community of inventors

Kyotanabe, Japan

Osamu Kawasaki