Nippondenso Co., Ltd.

Science and Technology Agency Natl. Institute for Research in Inorganic

Denso Corporation

Akira Fujii

Masahiro Tomita

Hitoshi Niwa

Satoshi Hayashi

Shin-ichi Shirasaki

Shinro Oda

Masayoshi Tanigawa

Naoto Niwa

According to the present invention there is provided a piezoelectric type actuator wherein a compressive force is exerted on a piezoelectric laminate, using a coil spring having a relatively small spring constant and a coned disc spring having a relatively large spring constant, the said compressive force being in the range of 4.0 to 50 in terms of the ratio of the spring constant of the coned disc spring to that of the coil spring. Under the above construction, the performance of the piezoelectric laminate is not deteriorated under any conditions during use, and the size of the piezoelectric type actuator can be reduced.

Piezoelectric type actuator

Aqueous titanium tetrachloride solution and aqueous zirconium nitrate solution of components except zirconium, for forming lead zirconate-tinatate in which part of the lead is substituted for any of the lanthanide elements are mixed, and the mixture is hydrolyzed to form sol. This sol is cleaned, dried, and calcined at 1100.degree. C. to form modified powder. The compounds of the remaining component of lead zirconate-titanate, such as TiO.sub.2 powder, PbO powder and Sm.sub.2 O.sub.3 powder, are mixed with the modified powder, and the resultant mixture is calcined at 750.degree. C. for 1 hour to produce the lead zirconate-titanate.

Method for producing two-component or three-component lead

Growing community of inventors

Aichi, Japan

Akira Fujii