Liquid Ejection Head Supply Port Layout for Joining Reliability
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Solution Overview
Problem
Existing liquid ejection heads face challenges in maintaining joining reliability due to reduced width of ejection element substrates and increased demand for high-viscosity liquid handling, leading to potential leaks and insufficient liquid supply performance.
Innovation Solution
A liquid ejection head design with first and second common flow passages intersecting the ejection direction, featuring second supply ports on the side portions of the ejection element plate, allowing for increased joining area and reliable liquid supply even with high-viscosity liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the flow passage and joining area are arranged on the same plane to reduce substrate width, then the ejection element substrate width is reduced, but the joining area becomes small and joining reliability decreases
Solution Approach 1:
The patent applies dimensionality change by arranging the second supply port in the depth direction (ejection direction) rather than on the same plane as the joining area. This spatial reconfiguration in the Z-direction allows the flow passage to be positioned away from the joining surface, maintaining a sufficient joining area while still providing effective liquid supply to the ejection ports.
2Productivity
If the number of supply ports is increased to improve printing speed and handle high-viscosity liquid, then the liquid supply capability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the liquid supply system into multiple independent supply ports (first supply port and second supply port) that can operate simultaneously. This segmentation allows parallel liquid supply to different ejection elements, increasing printing speed and capability to handle high-viscosity liquids without requiring a single complex flow passage structure.
Solution Approach 2:
The first common flow passage serves multiple functions: it acts as a joining surface for securing the ejection element substrate, provides a pathway for liquid supply through the first supply port, and accommodates the second supply port for additional liquid supply. This multi-functionality reduces overall device complexity while maintaining enhanced liquid supply capability.
Data Source
AI summary
A liquid ejection head and a liquid ejection apparatus can join the ejection member to the ejection member joining surface with a sufficient joining area, and suppress a decrease in joining reliability. To this end, second supply ports are provided in side portions of an ejection member.