Piezoelectric Liquid Discharge Head Warping Control
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Solution Overview
Problem
Publicly known ink-jet heads experience warping deformation in piezoelectric material layers due to calcination, which can lead to convex deformation issues affecting the reliability and performance of the liquid discharge process.
Innovation Solution
A liquid discharge head configuration with a piezoelectric body featuring specific electrode arrangements and through holes to reduce warping deformation, where individual electrodes and common electrodes are strategically positioned with protrusions and extending portions to minimize metal film area and stress differences across the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy electrodes are formed on surfaces of piezoelectric material layers to reduce warping deformation, then warping deformation is reduced, but device complexity increases
Solution Approach 1:
The patent moves the common electrode from the surface plane to an intermediate plane within the piezoelectric body thickness direction. This dimensional change allows the common electrode to be positioned at a location that balances stress distribution without requiring additional surface electrodes, thus reducing complexity while maintaining warping control.
Solution Approach 2:
The patent extracts the common electrode from the surface layer and relocates it to an intermediate plane within the piezoelectric body. This separation allows the common electrode to function independently in reducing warping deformation without adding surface complexity, as it can be integrated within the existing layer structure.
2Manufacturing precision
If metal film area is reduced to minimize stress differences, then warping deformation is reduced, but electrical conductivity may be affected
Solution Approach 1:
The patent applies local quality by positioning the common electrode at an intermediate plane where it can provide electrical connectivity locally without requiring extensive surface coverage. The electrode is strategically placed to provide sufficient conductivity for its function while minimizing overall metal film area to reduce stress-induced warping.
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 configuration effectively reduces warping deformation, enhancing the stability and performance of the ink-jet head by optimizing the distribution of metal film areas and stress across the piezoelectric layers, thereby improving the reliability of the liquid discharge process.
Implementation Method 1
an ink-jet head including a piezoelectric body in which piezoelectric material layers (ceramics sheets) are stacked on top of each other
Data Source
AI summary
A liquid discharge head includes: a piezoelectric body including piezoelectric layers stacked in a stacking direction, the piezoelectric body including a first end and a second end that are separated in a first direction orthogonal to the stacking direction of the piezoelectric layers; individual electrodes positioned in a first plane orthogonal to the stacking direction; a first common electrode formed in a second plane that is orthogonal to the stacking direction and of which position in the stacking direction is different from a position of a neutral plane of the piezoelectric body in the staking direction and a position of the first plane in the staking direction; and a trace positioned in a third plane of which position in the stacking direction is different from a position of the first plane, the position of the second plane, and the position of the neutral plane.