Resin Pressure Chamber Wall Segmentation for Liquid Ejection Heads
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Solution Overview
Problem
Highly integrated nozzle arrangements in liquid ejection heads using photosensitive resin pressure chambers face deformation issues due to thin walls, leading to reduced ejection frequency and compromised working accuracy.
Innovation Solution
A structure connecting at least two side surfaces of the pressure chamber walls formed from photosensitive resin is introduced to suppress deformation, allowing for more precise and integrated nozzle arrangements without affecting the operation of piezoelectric elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the degree of integration of the nozzles is improved by using thin walls between adjacent pressure chambers, then nozzle integration density increases, but liquid ejection frequency decreases due to wall deformation
Solution Approach 1:
The pressure chamber wall is segmented into multiple sections along the longitudinal direction, with through-holes formed at specific positions. This segmentation allows the wall to maintain structural integrity while reducing material usage and preventing deformation, thus maintaining high ejection frequency while achieving dense nozzle integration.
Solution Approach 2:
The pressure chamber wall incorporates through-holes creating a porous structure that reduces wall rigidity requirements. This porous design allows thin walls to maintain sufficient strength to prevent deformation during high-frequency operation, enabling both high integration density and maintained ejection frequency.
2Ease of manufacture
If photosensitive resin is used to form pressure chambers for high integration, then manufacturing cost decreases and integration improves, but wall deformation occurs reducing working accuracy
Solution Approach 1:
The continuous pressure chamber wall is divided into segments with through-holes at specific positions. This segmentation reduces the overall rigidity requirement of the wall while maintaining local structural integrity, preventing deformation during operation and preserving working accuracy despite using cost-effective photosensitive resin materials.
Solution Approach 2:
The through-holes are strategically positioned at specific locations along the pressure chamber wall rather than uniformly distributed. This local quality approach allows the wall to maintain sufficient strength at critical positions while reducing material usage overall, preventing deformation and maintaining working accuracy.
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 enhances the working accuracy and integration density of nozzles while maintaining efficient liquid ejection frequency, even with increased aspect ratios of pressure chamber dimensions.
Implementation Method 1
a substrate including a piezoelectric element for generating pressure for ejecting the liquid from the nozzle
Implementation Method 2
forming the wall member includes molding a first photosensitive resin and exposing the first photosensitive resin to light, molding a second photosensitive resin on the first photosensitive resin and exposing the second photosensitive resin to light
Data Source
AI summary
A liquid ejection head includes a nozzle plate where a nozzle for ejecting a liquid is provided, a substrate including a piezoelectric element for generating pressure for ejecting the liquid from the nozzle, and a wall member made of a resin and provided between the nozzle plate and the substrate to form a pressure chamber that communicates with the nozzle. A structure for connecting at least two side surfaces, among a plurality of side surfaces of the wall member that forms the pressure chamber, is provided.