Liquid Ejection Head Damper Fixation for Crosstalk Suppression
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Solution Overview
Problem
Existing liquid ejection heads face issues with crosstalk due to pressure variations propagating through liquid flow paths, which are not adequately addressed by current damping methods, particularly when high-density ejection ports are required.
Innovation Solution
A liquid ejection head design that includes a damper member sandwiched between two substrates, with an adhesive agent bonding the damper member to the substrates, ensuring firm fixation by anchoring the damper member through multiple surfaces, thereby preventing peeling and enhancing damping capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area functioning as a damper is enlarged by not forming the ejection port in the elastic member, then the damping capacity is improved, but the elastic member becomes difficult to fix firmly
Solution Approach 1:
The adhesive agent extends along the side surface of the elastic member in the thickness direction, transitioning from a simple planar bonding interface to a three-dimensional anchoring structure. This dimensional extension allows the adhesive to wrap around and secure the larger-area elastic member effectively, resolving the fixation difficulty caused by enlarging the damper area.
Solution Approach 2:
The adhesive agent is positioned within the groove formed on the substrate, creating a nested structure where the adhesive is contained and anchored by the groove geometry. This nesting provides mechanical interlocking that enhances the bonding strength between the substrate and the enlarged elastic member.
2Productivity
If high-density ejection ports are required, then the ejection port density is improved, but pressure variations propagate more easily causing crosstalk
Solution Approach 1:
The elastic member is extracted as a separate damping component that can be independently optimized. By forming the ejection ports in the substrate rather than the elastic member, the damping function is separated from the ejection function, allowing high-density port arrangement while maintaining effective pressure damping through the elastic member's inherent elasticity.
3Strength
If the adhesive agent bonds the damper member to both substrates, then the fixation strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The adhesive agent simultaneously performs multiple functions: bonding the elastic member to both substrates, filling the groove for mechanical interlocking, and extending along the side surface for anchoring. This merging of functions into a single adhesive application step enhances bonding strength without proportionally increasing manufacturing complexity.
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
The design effectively suppresses crosstalk, allowing for higher ejection port density while maintaining stable ejection operations by firmly fixing the damper member, thus reducing the risk of peeling and improving bonding strength.
Implementation Method 1
the damper member is bonded to the first substrate and the second substrate by an adhesive agent
Implementation Method 2
a damper member suppressing vibrations of a liquid
Data Source
AI summary
A liquid ejection head has a first substrate, a second substrate, and a damper member suppressing vibrations of a liquid. The damper member bonds the first substrate and the second substrate to each other by an adhesive agent. The damper member has a first area sandwiched between the first substrate and the second substrate and a second area not sandwiched between the first substrate and the second substrate. In the second area, the adhesive agent adheres to the side surface of the damper member so as to fix the damper member firmly.