PIEZOELECTRIC/ELECTROSTRICTIVE ACTUATOR

摘要

[Subject] The piezoelectric/electrostrictive actuator which presents excellent insulation durability even under a high-humidity atmosphere while suppressing inhibition of piezoelectric displacement should be provided. [Solution means]A piezoelectric/electrostrictive actuator which comprises:
a piezoelectric/electrostrictive element comprising at least one laminated object including a piezoelectric/electrostrictive layer and a pair of electrodes arranged respectively on both sides of said piezoelectric/electrostrictive layer, and having an operating part corresponding to the portion in which said piezoelectric/electrostrictive layer is sandwiched in between said pair of electrodes and a non-operating part corresponding to the portion in which said piezoelectric/electrostrictive layer is not sandwiched in between said pair of electrodes, and
a moisture-proof film arranged so as to cover at least the vicinity of a boundary between said operating part and said non-operating part, consisting of a liquid with a saturated moisture content at 25 degree Celsius of 300 ppm or less and a withstand voltage at the saturated moisture content of not less than 6kV/mm, and said liquid contains, as a main component, hydrocarbon system organic compound having a main backbone of carbon-carbon bond and consisting only of carbon and hydrogen.