US 12,010,922 B2
Method for producing a piezoelectric stack actuator, and piezoelectric stack actuator
Kevin Speer, Mörsdorf (DE)
Assigned to PI CERAMIC GMBH, Lederhose (DE)
Appl. No. 17/428,106
Filed by PI Ceramic GmbH, Lederhose (DE)
PCT Filed Feb. 10, 2020, PCT No. PCT/EP2020/053299
§ 371(c)(1), (2) Date Aug. 3, 2021,
PCT Pub. No. WO2020/161353, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 102019201650.2 (DE), filed on Feb. 8, 2019.
Prior Publication US 2022/0059751 A1, Feb. 24, 2022
Int. Cl. H10N 30/87 (2023.01); H10N 30/057 (2023.01); H10N 30/063 (2023.01); H10N 30/50 (2023.01)
CPC H10N 30/871 (2023.02) [H10N 30/057 (2023.02); H10N 30/063 (2023.02); H10N 30/503 (2023.02)] 13 Claims
OG exemplary drawing
 
1. A method for producing a piezoelectric stack actuator, the method comprising:
a. Step A: providing at least two actuators, each actuator including a top and a bottom surface configured to be connected directly, or indirectly via an additional element, to a respective top or bottom surface of an adjacent actuator, the at least two actuators are configured and designed to generate a deflection along an axis (A) when electrically activated, wherein step A includes sub-steps of:
Sub-step A1: providing piezoceramic layers and electric contacts to make up the at least two actuators as multi-layer actuators, and
Sub-step A4: enveloping the piezoceramic layers and the electric contacts with a ceramic insulating material; and
b. Step B: mechanically coupling the at least two actuators to define a mutual coupling area (K) including ceramic insulating material of the enveloped piezoceramic layers between each two adjacent actuators to form the stack actuator that is centered and stacked along a stacking axis (S) such that deflections of the actuators generated when the actuators are electrically activated will be overlaid along the stacking axis (S) and there is a force-coupling of the actuators over the coupling area (K), wherein the coupling area (K) is smaller than a projection area (P) resulting from a projection of each of the actuators onto a plane (E) perpendicular to the stacking axis (S).