Murata Manufacturing Co., Ltd.

Yuji Kosugi

Tetsuo Takeshima

Shigemasa Kusabiraki

Takeshi Yamazaki

Manabu Sumita

Kiyotaka Tajima

Takeshi Kubo

A piezoelectric diaphragm has principal-surface electrodes formed on upper and lower principal surfaces of a multilayer ceramic body. An internal electrode is disposed in an interface between adjacent piezoelectric ceramic layers. The upper and lower principal surfaces of the multilayer ceramic body are substantially entirely covered with a resin layer. A first cutout is formed in a side-edge portion, along the first side surface electrode, of the upper resin layer such that the upper principal-surface electrode is partially exposed in the first cutout. A second cutout is formed in a side-edge portion, along the first side surface electrode, of the lower resin layer such that the lower principal-surface electrode is partially exposed in the second cutout. The locations of the first and second cutouts formed in the upper and lower resin layers, respectively, are selected such that they do not oppose each other.

Piezoelectric diaphragm and piezoelectric electroacoustic transducer using the same

A piezoelectric electroacoustic transducer includes a piezoelectric diaphragm having a substantially rectangular shape which vibrates in the thickness direction when an alternating current is applied between electrodes of the piezoelectric diaphragm, a housing which stores the piezoelectric diaphragm, and a pair of terminals formed in the housing by insert molding. One end of each terminal is inserted inside the housing and includes a body portion fixed to the housing and wing portions which extend from both sides of the body portion toward the corners of the housing. The wing portions are not fixed to the housing, and stress-relieving portions are disposed between the body portion and the wing portions so that the wing portions are able to move toward the inside of the housing. Each electrode of the piezoelectric diaphragm is connected to at least one of the wing portions of the terminals by a conductive adhesive.

Piezoelectric electroacoustic transducer

While suppressing that a vibration of a piezo-electric element propagates to a substrate by devising the composition of an electro-conductive support body, the piezoelectric resonant component which secures electroconductivity and can maintain a fall-proof shock property is provided. The piezoelectric resonant component has a substrate on the top surface of which pattern electrodes and are formed, and on the lower surface of which it has electrodes and It has a piezoelectric element using the length vibration on the substrate Electro-conductive support bodies and are fixed to the length direction center section of the lower surface electrodes of the piezoelectric element The connection fixation of these support bodies and to the pattern electrodes and of the substrate is performed by electro-conductive adhesives and The electro-conductive support bodies and include an urethane resin which contains an electro-conductive filler, making the rate of content of the electro-conductive filler 75-85 wt %.

Piezoelectric resonant component

A piezoelectric resonator supporting structure supports a piezoelectric resonator at a supporting member through a connecting member. The piezoelectric resonator is adapted to vibrate in a longitudinal vibration mode. A portion of the fixing member that contacts the piezoelectric resonator is made of a vibration transmission restricting material for restricting transmission of vibration from the piezoelectric resonator to the supporting member through the connecting member.

Growing community of inventors

Toyama, Japan

Yuji Kosugi