Piezoelectric actuator and piezoelectric actuator with a protective layer system

Disclosed is a piezoelectric actuator module with a piezo actuator (1) having between Anbindeteile (4, 5) arranged piezoelectric elements, with a least the piezo elements enclosing protective layer system. The protective layer system consists of two layers (basecoat and topcoat), wherein the second layer of at least two metal sheets, preferably metal sheets (2, 3) or metal sleeves (9, 10) is composed, which are superimposed such that the (the Anbindeteilen 4, 5) or (7) to the actuator head and / or actuator base (8) indicative of the lateral areas (2 ', 3') a layer of a predetermined amount about the other location protrude. The after wrapping of the piezoelectric actuator (1) protruding lateral portions (2 ', 3') are connected to the respective attachment member (4, 5) and the actuator head (7) and / or the actuator foot (8) sealingly connected.