Oliff & Berridge
Laminate type piezoelectric actuator element
 A laminate piezoelectric actuator element comprising plural laminated piezoelectric subunits each of which comprises piezoelectric ceramic layers for generating longitudinal electrostrictive strain with a voltage, internal electrodes for applying the voltage to said piezoelectric ceramic layers, and piezoelectrically-inactive portions which correspond to parts of the piezoelectric ceramic layers having no internal electrodes laminated thereon. The piezoelectric ceramic layers and the internal electrodes are alternatively laminated on each other to form a piezoelectric subunit. An adhesive member having an attaching area equal to or smaller than an area of each internal electrode is provided between the neighboring piezoelectric subunits to thereby attach and assemble the plural piezoelectric subunits to form the piezoelectric actuator element and form slit portions between the laminated piezoelectric subunits in such a manner as to surround the adhesive member. The piezoelectric actuator element further includes external electrodes provided at both sides thereof in such a manner as to be connected to the internal electrodes to apply the voltage to the internal electrodes. 
Brother Kogyo Kabushiki Kaisha
H B
H01L B41J
inventional inventional
Yoshikazu Masahiko Makoto
Takahashi Suzuki Takeuchi