Piezoelectric Liquid Discharge Head Warpage Reduction
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Solution Overview
Problem
The existing liquid discharge heads, particularly those using piezoelectric materials, suffer from warpage deformation due to the formation of electrode arrays during calcination, which affects the accuracy and reliability of inkjet printing.
Innovation Solution
The design incorporates a specific configuration of individual electrodes and common electrodes on a piezoelectric body, with conductor layers formed on certain planes to balance the area and distance relationships, reducing warpage deformation by adjusting the distribution of electrode areas and distances to minimize residual thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrode arrays are formed in piezoelectric material layers, then the liquid discharge head can function properly, but warpage deformation occurs in the piezoelectric body
Solution Approach 1:
The patent applies preliminary anti-action by forming dummy electrodes on the piezoelectric material layers before the harmful warpage deformation can occur. These dummy electrodes are strategically positioned to generate counteracting forces that prevent the warpage caused by the functional electrode arrays during calcination and operation
Solution Approach 2:
The dummy electrodes act as a counterweight to balance the thermal stress and mechanical forces generated by the functional electrode arrays. By positioning dummy electrodes at specific locations with appropriate areas, the patent creates a counterbalancing effect that offsets the warpage deformation, maintaining the piezoelectric body's shape stability
2Shape
If dummy electrodes are added to reduce warpage, then shape stability improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by positioning dummy electrodes only at specific locations where they are most effective in counteracting warpage, rather than uniformly distributing them across the entire piezoelectric body. The area and position of each dummy electrode are optimized locally to achieve maximum shape stability with minimum added complexity
Solution Approach 2:
The patent uses partial action by implementing dummy electrodes only in the necessary regions where warpage compensation is required, rather than adding them throughout the entire structure. This selective approach achieves shape stability while minimizing the increase in device complexity
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 configuration effectively reduces the warpage deformation of the piezoelectric body, enhancing the stability and performance of the inkjet head by minimizing the difference in residual stress across the piezoelectric layers, thereby improving print quality and reliability.
Implementation Method 1
an ink jet head having an ink jet head having a piezoelectric body where a plurality of piezoelectric material layers (ceramics sheets) are stacked
Data Source
AI summary
S1 is a sum of the areas of a plurality of individual electrodes formed on a first plane of a piezoelectric body of a liquid discharge head, S2 is an area of a first common electrode formed on a second plane, S3 is an area of a second common electrode formed on a third plane, D1 is a distance between a neutral plane and the first plane in a stacking direction, D2 is the distance between the neutral plane and the second plane in the stacking direction, and D3 is the distance between the neutral plane and the third plane in the stacking direction. Then, D1×S1+D2×S2>D3×S3 is satisfied. The liquid discharge head includes a plurality of conductor layers which are formed on the third plane, without contact with the second common electrode and without contact with each other.