Piezoelectric Pump Terminal Level Correction for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Piezoelectric pumps face difficulties in mounting due to the level difference between terminal parts, which can cause noise from lead wire vibrations during operation.
Innovation Solution
A pump design with a power-feeding plate that includes a holding portion for both conductive portions, with coupling parts extending along the periphery and through-holes, and a cured resin member to reduce the level difference and prevent noise, allowing for easy mounting on a circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the piezoelectric pump uses a power-feeding plate with terminal parts at different levels to drive the piezoelectric device, then the piezoelectric device can be driven effectively, but there is a level difference between terminal parts that causes difficulty in mounting and generates noise from lead wire vibrations
Solution Approach 1:
The patent applies the equipotentiality principle by providing a first level correction portion and a second level correction portion that extend from the first and second terminal parts, respectively. These correction portions are positioned at different heights to compensate for the level difference between terminal parts, allowing both terminal parts to be at substantially the same level for easy mounting on circuit boards while maintaining effective piezoelectric device driving
2Reliability
If lead wires are used to connect terminal parts at different levels to the circuit board, then electrical connections can be established, but vibration from the piezoelectric pump is transmitted to the lead wires generating noise
Solution Approach 1:
The patent extracts the harmful lead wires from the system by providing terminal parts with coupling parts that enable direct mounting on circuit boards. The level correction portions allow both terminal parts to be at the same level, eliminating the need for lead wires and thereby preventing vibration transmission and noise generation
3Device complexity
If the power-feeding plate has terminal parts at different levels, then the piezoelectric device structure is simple, but the level difference causes difficulty in connecting to circuit board terminal parts
Solution Approach 1:
The patent maintains the simple piezoelectric device structure with terminal parts at different levels while adding level correction portions that extend from each terminal part. These correction portions compensate for the height difference, allowing both terminal parts to be positioned at substantially the same level for easy mounting on circuit boards without complicating the overall device structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design facilitates easy mounting and reduces noise by eliminating the need for lead wires, ensuring stable electrical connections and minimizing vibration-induced noise.
Implementation Method 1
When an alternating voltage at a predetermined frequency is applied to the piezoelectric device, the vibrating plate is driven at a resonant frequency
Implementation Method 2
vibration generated by driving the piezoelectric pump may be transmitted to the lead wires, which may generate noise
Data Source
AI summary
A pump includes a pump housing, a vibrating plate, a driving element, and a power-feeding plate including a first conductive portion and a second conductive portion electrically insulated from the first conductive portion. The driving element has a first surface and a second surface. The first conductive portion includes a first outer terminal part, a first connecting terminal part electrically connected to the second surface of the driving element, and a first coupling part coupling the first outer terminal part and the first connecting terminal part to each other. The second conductive portion includes a second outer terminal part and a second connecting terminal part electrically connected to the second outer terminal part and to the first surface of the driving element.