Piezoelectric Driving Apparatus Noise Suppression via Sub Waveform

The patent applies periodic driving waveforms consisting of multiple cycles instead of single pulse waveforms. The driving waveform includes a first periodic waveform that moves the movable body to a target position and a second periodic waveform that returns the movable body to the initial position. This periodic action allows the system to achieve accurate positioning while reducing vibrations and operating noise through the controlled oscillatory motion pattern.

The patent maintains continuous driving signal application to the piezoelectric element throughout the positioning process. Instead of applying a single pulse and stopping, the driving signal continues with adjusted amplitude and frequency to maintain control over the movable body's position while suppressing vibrations. This continuous action eliminates the inertia-induced vibrations that occur when driving signals are abruptly stopped.

The patent employs periodic driving waveforms that continuously oscillate the piezoelectric element rather than applying intermittent single pulses. The first periodic waveform moves the movable body to the target position through controlled oscillatory motion, and the second periodic waveform returns it to the initial position. This approach maintains productivity by achieving positioning while eliminating repeated vibration-induced noise that occurs with intermittent driving signals.

The driving signal is applied continuously to the piezoelectric element throughout the entire positioning cycle, including both the forward movement to the target position and the return to the initial position. This continuous application of the driving signal with adjusted parameters maintains the movable body's position control while suppressing vibrations, thereby achieving both productivity and noise reduction.

The patent uses periodic driving waveforms with different phases and amplitudes applied to different piezoelectric elements. The driving signal includes a first periodic waveform for moving the movable body to the target position and a second periodic waveform for returning it to the initial position. This periodic approach suppresses operating noise while maintaining relatively simple driving circuitry compared to complex adaptive control systems.

The driving circuit is designed to generate multiple types of periodic waveforms (first and second periodic waveforms with different phases and amplitudes) using a unified control approach. The same driving circuit can apply different periodic waveforms depending on the operation phase (forward movement or return movement), reducing the need for separate specialized circuits for each waveform type and simplifying the overall system.

The patent employs periodic driving waveforms with standardized phases and amplitudes that can be systematically applied to reduce operating noise. The first periodic waveform moves the movable body to the target position while the second periodic waveform returns it to the initial position. This structured periodic approach provides a clear design framework that reduces the time required to develop and optimize noise reduction compared to trial-and-error methods.

The driving circuit is designed in advance to generate the specific periodic waveforms needed for noise reduction. The control system is pre-configured to apply the first periodic waveform during forward movement and the second periodic waveform during return movement. This preliminary design of the waveform generation capability eliminates the need for complex real-time waveform synthesis and reduces overall design time.