Other

Denso Corporation

Youta Iwamoto

Takashi Yamamoto

Eturo Yasuda

Toshiatsu Nagaya

Hitoshi Shindo

Atsuhiro Sumiya

An integrally fired, laminated electromechanical transducing element, fabricated using an inexpensive electrode material and having the electrode characteristic at least equivalent to that of the Ag&mdash;Pd electrode, is disclosed. Especially, in the integrally fired, laminated electromechanical transducing element according to the invention, (A) the rigidity of the internal electrode layers is low and the internal stress generated at the time of expansion or contraction of the ceramic layers is small, (B) the antimigration characteristic is superior, (C) the charge loss is small, the heat conductivity is high and the heat radiation characteristic is superior, and/or (D) the bonding strength between the ceramic layers and the electrode layers is high. The integrally fired, laminated electromechanical transducing element ( ) according to the invention comprises, for example, an integrally fired laminate member fabricated by integrally firing a plurality of the ceramic layers ( ) of piezoelectric ceramic or electrostrictive ceramic and the internal electrode layers ( ) interposed between the ceramic layers ( ). The main component of the internal electrode layers ( ) is a base metal having a rigidity of not more than 160 GPa.

Integrally fired, laminated electromechanical transducing element

This invention provides a piezoelectric actuator exhibiting a small change of displacement even when ranges of use conditions such as a temperature, an electric field and a compressive stress are broad, and a driving method of the piezoelectric actuator. In the piezoelectric actuator using a piezoelectric body undergoing displacement upon application of a voltage, a crystalline structure of the piezoelectric body substantially exists on a tetragonal system side outside of a morphotropic phase boundary (MPB) between the tetragonal system and a rhombohedral system under conditions of the lowest temperature, the lowest electric field and the maximum compressive stress that are used.

Piezoelectric actuator and method for driving the same

Growing community of inventors

Inabe-gun, Japan

Youta Iwamoto