Patent ID: 7268468

Claim:
A piezoelectric actuator comprising a multilayered structure of piezoelectric layers ( 2 ) with inner electrodes ( 3 , 4 ) interspersed between the piezoelectric layers, and outer electrodes ( 5 , 6 ) and layers of an adhesive band of insulating material contacting the inner electrodes ( 3 , 4 ) on alternating sides, wherein the regions between the outer electrodes ( 5 , 6 ) are provided with a suitable insulation ( 7 , 8 ), the insulation being a layer covering only precisely the region between the outer electrodes ( 5 , 6 ), wherein the insulation ( 7 , 8 ) is applied in a tension-free manner exactly in the region between the outer electrodes ( 5 , 6 ) and covering at least one edge of the piezoelectric actuator with constant thickness.