Patent ID: 7482733

Claim:
Piezo actuator for miniaturized pumps, atomizers, valves, with a piezoelectric disk ( 1 ) and a support disk ( 2 ) connected to the piezoelectric disk, the support disk being connected around its edge ( 18 ) to a substrate ( 3 ) in a fluid-tight manner, where the support disk can be deflected by the piezoelectric disk ( 1 ) to change the volume of a cavity ( 4 ) formed between the support disk ( 2 ) and the substrate ( 3 ), comprising a weak point ( 6 , 9 ), which extends along the connecting edge ( 18 ) of the support disk ( 2 ) and which acts as a joint when the support disk is deflected, wherein the weak point ( 6 , 9 ) is formed by at least one of the following, a ring-shaped groove ( 6 ) and a ring-shaped, stepped recess ( 9 ), and the ring-shaped groove ( 6 ) or the offset of the stepped recess ( 9 ) runs in a projection plane parallel to a plane of the piezoelectric disk and at a distance from the connecting edge ( 18 ) as well as from the piezoelectric disk ( 1 ).