Patent ID: 7267043

Claim:
An actuator assembly comprising: a housing; an actuator element configured for reciprocating movement at least partially within the housing; wherein, with respect to the housing, the actuator element at least partially defines a first variable fluidic chamber and a second variable fluidic chamber; a first piezoelectric assembly comprising a first variable reservoir connected to the first variable fluidic chamber; a second piezoelectric assembly comprising a second variable reservoir connected to the second variable fluidic chamber, both the first variable reservoir and the second variable reservoir being at least partially formed with a piezoelectric material; a first working fluid for occupying the first variable reservoir and the first variable fluidic chamber; a second working fluid for occupying the second variable reservoir and the second variable fluidic chamber; the first piezoelectric assembly and the second piezoelectric assembly being arranged whereby a temperature dependency of the first piezoelectric assembly is cancelled by the temperature dependency of the second piezoelectric assembly.