Liquid Ejection Head Adhesive Recess Design
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Solution Overview
Problem
Existing liquid ejection heads face challenges in preventing ink leak while avoiding adhesive agent protrusion, which can lead to channel blocking when excessive adhesive is applied.
Innovation Solution
The liquid ejection substrate includes a channel formation substrate with recess portions in the joining regions, allowing the adhesive agent to be accommodated within these recesses, thereby controlling its protrusion and preventing channel blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of adhesive agent is applied to increase protrusion for preventing ink leak, then ink leak prevention is improved, but channel blocking occurs due to excessive adhesive protrusion
Solution Approach 1:
The partition structure is designed with different local properties: the first partition has adhesive agent application portions with protrusions to prevent ink leak, while the second partition has flat surfaces without protrusions to avoid channel blocking. This local differentiation allows the adhesive agent to serve different functions in different regions.
Solution Approach 2:
The partition is divided into multiple sections with distinct characteristics. The first partition contains adhesive agent application portions for ink leak prevention, while the second partition provides flat adhesion surfaces. This segmentation allows independent optimization of each region's function.
2Object-affected harmful factors
If adhesive agent protrusion is controlled to prevent channel blocking, then channel blocking is prevented, but ink leak prevention capability is reduced
Solution Approach 1:
Different regions of the partition are designed with different adhesion characteristics. The first partition has protrusions that allow controlled adhesive protrusion for ink leak prevention, while the second partition has flat surfaces that prevent excessive protrusion and channel blocking.
Solution Approach 2:
The partition structure acts as an intermediary between the adhesive agent and the channel. By designing specific adhesion portions and flat surfaces on the partition, it mediates the adhesive agent's behavior to achieve both ink leak prevention and channel protection.
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 suppresses adhesive agent protrusion into the channels, ensuring reliable ink ejection by preventing ink leaks and channel blockages, thus enhancing the reliability of the liquid ejection head.
Implementation Method 1
the adhesive agent is accommodated in the recess portion
Data Source
AI summary
In a liquid ejection head including a liquid ejection substrate configured to eject liquid, the liquid ejection substrate is configured to include a first substrate in which a channel for the liquid is formed and a second substrate joined to a first surface of the first substrate via an adhesive agent, the first substrate has, as viewed in a direction perpendicular to the first surface, a channel region including a plurality of the channels for the liquid and a partition sectioning the adjacent channels for the liquid from each other and a joining region adjacent to the channel region and including a recess portion open on the first surface, and the adhesive agent is accommodated in the recess portion.