Liquid Ejecting Head Piezoelectric Segmentation for Vibration Control
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Solution Overview
Problem
In existing liquid ejecting heads, the wide extension of the piezoelectric body across the sealing plate and pressure compartment substrate leads to vibration transmission, causing changes in the relative positional relationship between the sealing plate and piezoelectric body, affecting the performance and reliability of the liquid ejection.
Innovation Solution
The liquid ejecting head design includes a piezoelectric element with a piezoelectric body that is structured to have separate regions for the piezoelectric drive and periphery, positioned away from each other, reducing vibration transmission and foreign substance entry, thereby maintaining the integrity of the sealing and ejection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the piezoelectric body is extended widely from the pressure compartment region to the recess walls, then the structural support and electrical connection are improved, but vibration is transmitted to the recess walls causing positional relationship changes
Solution Approach 1:
The piezoelectric body is divided into multiple independent piezoelectric elements, each corresponding to a specific pressure compartment. This segmentation prevents vibration from one element from being transmitted through a continuous piezoelectric body to adjacent recess walls, thereby maintaining positional stability while providing sufficient structural support through the distributed arrangement of multiple elements.
Solution Approach 2:
Each piezoelectric element is locally optimized to extend only to the extent necessary for its specific function - providing electrical connection and structural support to its corresponding pressure compartment and recess wall interface. This localized extension minimizes unnecessary vibration transmission paths while maintaining adequate local support and connectivity.
2Strength
If the piezoelectric body extends to overlap with recess walls, then electrical connection and structural support are enhanced, but foreign substances can enter the gaps between the piezoelectric body and sealing plate
Solution Approach 1:
The piezoelectric body is segmented into discrete piezoelectric elements that are independently positioned within the recess. This segmentation creates isolated units that can be precisely fitted within the recess space, minimizing gaps between the elements and the sealing plate, thereby preventing foreign substance entry while maintaining structural support.
Solution Approach 2:
A sealing structure acts as an intermediary between the piezoelectric elements and the external environment. This sealing plate or sealing structure fills and seals the gaps between the piezoelectric elements and the recess walls, preventing foreign substances from entering while allowing the piezoelectric elements to maintain their structural support function.
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
This design reduces the likelihood of foreign substance entry and vibration-induced positional changes, enhancing the sealing and ejection performance of the liquid ejecting head by minimizing the impact of foreign substances and vibration transmission.
Implementation Method 1
a piezoelectric element that includes a piezoelectric body, an upper electrode, and a lower electrode; a pressure compartment that increases and decreases an internal pressure in accordance with driving of the piezoelectric element
Data Source
AI summary
When the liquid ejecting head is viewed in plan in a vertical direction, the piezoelectric body includes a first region extending from a position of overlapping with the first pressure compartment to a position of overlapping with one of two walls that the first recess includes in the first direction, a second region overlapping with the other of the two walls that the first recess includes in the first direction, and a fifth region overlapping with the other of the two walls. In the first direction, the fifth region is located between the first region and the second region and is provided away from the first region and the second region.