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 is designed with a configuration where the piezoelectric body is positioned such that its active and passive regions are separated, with the active region overlapping with the pressure compartment and one wall of the recess, and the passive region overlapping with another wall, ensuring they are not contiguous, thereby reducing vibration transmission and foreign substance entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the piezoelectric body is provided in a wide range overlapping with both walls of the recess and the pressure compartment, then the structural support is improved, but vibration is transmitted to the walls causing changes in relative positional relationships
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 to adjacent elements and their corresponding walls, while each element maintains adequate overlap with its own pressure compartment for structural support.
Solution Approach 2:
Each piezoelectric element is designed with specific local overlap characteristics - overlapping with its corresponding pressure compartment for support, but with controlled overlap with recess walls to prevent vibration transmission. This local quality optimization resolves the contradiction between needing support and avoiding vibration transmission.
2Ease of manufacture
If the piezoelectric body extends widely across the sealing plate, then the manufacturing process is simplified, but foreign substances can enter between the piezoelectric body and sealing plate
Solution Approach 1:
Dividing the piezoelectric body into separate elements creates natural gaps between them, which act as barriers to prevent foreign substances from entering and accumulating in the space between the piezoelectric body and sealing plate, while maintaining manufacturing simplicity.
3Stability of the object's composition
If the piezoelectric body overlaps with both walls of the recess, then the mounting stability is improved, but vibration causes changes in relative positional relationships between components
Solution Approach 1:
Separating the piezoelectric body into independent elements mounted in individual recesses ensures that each element maintains stable mounting with its own recess walls while preventing vibration-induced positional changes from affecting adjacent elements or the overall assembly precision.
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 minimizes the impact of vibration transmission on the sealing performance and reduces the likelihood of foreign substance interference, maintaining consistent ejection performance and reliability.
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, the piezoelectric body includes a first region overlapping with the first pressure compartment, a second region overlapping with a wall of the first recess, a third region overlapping with the second pressure compartment, and a fourth region overlapping with a wall of the second recess. The first region is located between the second region and the third region and is provided away from the second region. The third region is located between the first region and the fourth region and is provided away from the fourth region.