Liquid Ejection Head Protective Openings to Prevent Adhesive Bubbles
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Solution Overview
Problem
Existing liquid ejection heads face the risk of air bubbles being trapped in the adhesive when a protective member is bonded to the ejection surface, which can expand and cause adhesive to scatter near the ejection ports, potentially damaging the head.
Innovation Solution
The protective member is designed with openings corresponding to the ejection port rows and additional openings between these rows and the edge, preventing air bubbles from being trapped during bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective member is bonded to the ejection surface with an adhesive, then the protective member provides protection against physical damage, but air bubbles may be trapped in the adhesive causing reliability issues
Solution Approach 1:
The protective member is segmented with multiple openings (first openings corresponding to ejection port rows, second openings between adjacent ejection port rows) that divide the bonding area into separate regions. This segmentation prevents air bubbles from being trapped during adhesive bonding, as air can escape through these openings, thereby resolving the contradiction between providing protective coverage and ensuring bonding reliability.
2Strength
If the protective member covers the entire ejection surface, then protection is maximized, but air bubble entrapment risk increases
Solution Approach 1:
The protective member incorporates a porous structure with multiple openings distributed across its surface. These openings allow air to escape during the adhesive bonding process while the solid portions of the protective member maintain continuous coverage for protection. This resolves the contradiction by providing both comprehensive protection and air bubble escape pathways.
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 reduces the risk of air bubble entrapment, ensuring reliable operation and minimizing damage to the ejection head by maintaining adhesive integrity.
Implementation Method 1
a protective member configured to be bonded to the first surface of the ejection substrate via an adhesive
Data Source
AI summary
A liquid ejection head includes an ejection substrate including an ejection port row in a first surface, the ejection port row having a plurality of ejection ports configured to eject liquid arranged in the ejection port row, and a protective member configured to be bonded to the first surface of the ejection substrate via an adhesive, the protective member including a first opening corresponding to the ejection port row. The protective member further includes a second opening between the first opening and an outer edge of the protective member and outside a region where the ejection ports are formed, when viewed from a direction perpendicular to the first surface.