Fig. 4: Push-pull bending actuator in μSpeaker.
From: The push-pull principle: an electrostatic actuator concept for low distortion acoustic transducers

Schematic top view; symmetrical three-electrode arrangement forming a laterally deflecting beam
From: The push-pull principle: an electrostatic actuator concept for low distortion acoustic transducers

Schematic top view; symmetrical three-electrode arrangement forming a laterally deflecting beam