Ink Jet Recording Head Nozzle Plate Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High nozzle density and count in ink jet recording heads lead to separation of the nozzle plate from the substrate due to thermal expansion differences between silicon and epoxy resin, causing instability in ink jetting performance and reducing image quality.
Innovation Solution
The ink jet recording head is designed with ink flow paths arranged at a density higher than 1200 dpi, where the widths of the flow passage walls are smaller than the heights and widths of the flow paths, enhancing adhesion between the substrate and nozzle plate to prevent separation during shipment and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nozzle density and count are increased to improve printing speed and quality, then productivity is improved, but the ink passage wall thickness is reduced and chip size increases, causing the nozzle plate to separate from the substrate due to thermal expansion differences
Solution Approach 1:
The patent changes the geometric parameters of the ink passage walls, specifically making the width smaller than the height, and arranging flow paths at density higher than 1200 dpi. This parameter optimization allows the structure to maintain adhesion reliability while supporting high nozzle density for improved printing speed.
Solution Approach 2:
The patent employs a composite structure where the element substrate and nozzle plate are bonded together, utilizing adhesion techniques to create a reliable composite material system that withstands thermal expansion differences between dissimilar materials, preventing separation despite increased chip size and nozzle density.
2Measurement precision
If nozzle density is increased to improve image quality, then measurement precision is improved, but the ink passage wall becomes thinner, leading to nozzle plate separation due to environmental temperature and humidity changes
Solution Approach 1:
The patent optimizes the geometric parameters by arranging flow paths at density higher than 1200 dpi and making ink passage wall width smaller than height. This parameter change enables high nozzle density for improved image quality while maintaining structural stability against thermal and humidity variations.
Solution Approach 2:
The patent segments the ink passage structure into distinct components with optimized dimensions, where the ink passage wall width is specifically made smaller than the height. This segmentation allows independent optimization of each component to achieve both high resolution and structural stability.
3Productivity
If chip size is increased to accommodate more nozzles, then productivity is improved, but the stress from thermal expansion differences causes nozzle plate separation
Solution Approach 1:
The patent creates a composite structure of element substrate and nozzle plate that can accommodate large chip sizes for high nozzle count while managing thermal stress through proper adhesion techniques that prevent separation despite the accumulated thermal expansion differences across the large area.
Solution Approach 2:
The patent changes the structural parameters including flow path arrangement density (higher than 1200 dpi) and ink passage wall dimensions (width smaller than height), which allows the large chip to maintain structural integrity and resist thermal stress-induced separation while accommodating high nozzle count.
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 improves the reliability and resolution of the ink jet recording head by maintaining the adhesion between the nozzle plate and substrate, tolerating stress from temperature changes and preventing nozzle plate separation, thus ensuring stable ink jetting performance and high-quality image output.
Implementation Method 1
separation of the nozzle plate from the substrate due to thermal expansion differences between silicon and epoxy resin
Data Source
AI summary
An ink jet recording head includes an element substrate; a plurality of ejection outlets, provided on the element substrate, for ejecting ink in a direction perpendicular to the element substrate; and a nozzle formation member having a plurality of ink flow paths which are in fluid communication with the ejection outlets, respectively. The ink flow paths are arranged at a density higher than 1200 dpi in an arranging direction of the ejection outlets and widths of flow passage walls forming the ink flow paths are smaller than heights of the ink flow paths and are smaller than widths of the ink flow paths.