Tdk Corporation

Haruo Taguchi

Satoshi Ozawa

Munemitsu Hamada

Kohsuke Shimazaki

Akihiro Takeda

Shoichi Iwaya

Takeshi Masuda

Hitoshi Masumura

Tomohiro Sogabe

Syuuzi Itoh

Akira Takeishi

Akio Abe

Shigeya Takahashi

Masaru Fukuda

Hiroyuki Satoh

Hiroaki Abe

Yasutoshi Yamaguchi

Piezoelectric element

A piezoelectric element unit comprises an element body having internal electrodes laminated with piezoelectric layers therebetween and a pair of external electrodes electrically connected to the internal electrodes and an electric connection part for connecting a wiring part to the external electrodes. The electric connection part is composed of a conductive resin adhesive part and the conductive resin adhesive part is covered by a resin part.

Piezoelectric element unit and driving device

A piezoelectric element unit comprises an element body having an active part and an inactive part; and a first resin part bonding one end surface in the laminating direction of the element body to a mounting surface of a joint member placed to face the one end surface. The first resin part covers the mounting surface up to an outer side surface of the element body corresponding to an interface between the active part and the inactive part, a second resin part covers an outer surface of the first resin part covering the outer side surface of the element body at a position corresponding to the interface between the active part and the inactive part, and the second resin part also integrally covers the outer side surface of the element body corresponding to the active part.

A laminated piezoelectric device comprising a device bodyon which a number of piezoelectric layersand internal electrodesare laminated, external electrodeselectrically connected to the internal electrodesand formed on the surface of the device body, an insulation layerand a resistance layer. The insulation layercovers at least a portion wherein internal electrodesare exposed on the surface of the device body, where mechanical displacement is generated by applying voltage. The resistance layeris formed to connect between external electrodesand has a lower electric resistance value than the insulation layer

Laminated piezoelectric actuator

The present invention provides an electrode for a ceramic electrode fluorescent discharge lamp; an electrode material for a discharge lamp, which has high electron flow density, high thermal shock resistance, and reduced deterioration due to sputtering; and also a method for manufacturing the same. The invention makes it possible to reduce the tube diameter of the ceramic electrode fluorescent discharge lamp. An electrode material for a discharge lamp is obtained from a first component of 0.5 to 1.5 mols of BaO, CaO or SrO, a second component of 0.05 to less than 0.3 mols or more than 0.7 to 0.95 mols of ZrO,or TiO,, and a third component of 0.025 to less than 0.3 mols of V,O,, Nb,O,, Ta,O,, Sc,O,, Y,O,, La,O,, Dy,O,, or Ho,O,, or 0.05 to less than 0.15 mols or more than 0.35 to 0.95 mols of HfO,, CrO,, MoO,or WO,. This electrode material is granulated and is turned into a massive, granular, or porous electrode material. This is placed in a cylindrical semiconductor ceramic container with a closed bottom and is reduced and fired to prepare an electrode. A mercury dispenser of the ceramic electrode fluorescent discharge lamp is disposed in series between the cylindrical semiconductor ceramic container with a closed bottom and a lead-in portion of the lead wire.

Discharge lamp electrode

Ceramic cathode fluorescent discharge lamp

A semiconductive ceramic composition capable of permitting its resistance-temperature characteristics and resistance to be controlled as desired and a firing temperature of the composition to be lowered to a degree sufficient to facilitate the mass-production at a low cost. The composition contains a main component consisting of SrO, PbO and TiO.sub.2 and is subjected to firing in an oxidizing atmosphere. The composition may contain at least one of SiO.sub.2 and M as a minor component. A variation in amount of the main and minor components permits characteristics and properties of the composition to be varied as desired.

Semiconductive ceramic composition

Growing community of inventors

Tokyo, Japan

Haruo Taguchi