Haptic Feedback Actuator with Phase-Shifted Dual Drive

The patent applies periodic action by using alternating current signals with specific phase shifts to drive the actuators. The periodic nature of the AC signals enables continuous vibration generation while the phase opposition allows energy-efficient operation. The processing unit generates periodic power signals that are applied to the actuators in an alternating fashion, creating sustained haptic feedback without requiring continuous high-power input.

The patent changes the parameter of phase angle between the power signals supplied to different actuators. By setting a phase shift of approximately 180 degrees between signals to opposing actuators, the system achieves constructive interference that amplifies vibration amplitude without proportionally increasing power consumption. This parameter change allows the system to achieve higher mechanical power output from the same energy input.

The patent segments the actuation system into multiple independent actuators positioned at different locations on the plate, with each actuator receiving an independent control signal. This segmentation allows localized vibration generation that can be precisely controlled and combined to create amplified haptic feedback. The processing unit independently controls each actuator's activation timing and duration, enabling complex vibration patterns without requiring a single complex actuator.

The patent merges the effects of multiple actuators by coordinating their operation through phase-shifted power signals. When actuators are activated in sequence or simultaneously with appropriate phase relationships, their vibrational effects combine constructively to produce amplified haptic feedback. This merging of multiple simple actuator effects achieves the same result as a single complex high-power actuator but with better energy efficiency and control flexibility.