Liquid Ejecting Head Fixing Board Bending Portion
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Solution Overview
Problem
Existing liquid ejecting heads, such as ink jet type recording heads, face issues with moisture evaporation from the adhesive used to attach the head main body and maintaining member, which affects the stability and efficiency of the liquid ejection process.
Innovation Solution
A liquid ejecting head design that incorporates a fixing board with a bending portion adhered to the maintaining member, creating a space that houses the head main body, thereby reducing moisture evaporation and improving structural rigidity, allowing for closer nozzle openings and reduced width in the liquid ejecting head unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to attach the head main body and maintaining member, then the structural integrity is improved, but moisture evaporation from the adhesive increases
Solution Approach 1:
The patent implements nesting by placing the head main body inside a cavity formed by the maintaining member and fixing board. This nested structure allows the adhesive to be applied only at specific locations (bottom surface of head main body and inner wall of cavity) rather than across entire surfaces, reducing the total adhesive area and consequently moisture evaporation while maintaining structural integrity.
Solution Approach 2:
The patent applies adhesive only at specific local areas (bottom surface of head main body and inner wall of the cavity formed by maintaining member and fixing board) rather than uniformly across all contacting surfaces. This localized adhesive application reduces the overall amount of adhesive used and minimizes moisture evaporation while still achieving sufficient bonding strength.
2Ease of operation
If the head main body is exposed to the environment, then accessibility is improved, but moisture evaporation from adhesive increases
Solution Approach 1:
The head main body is nested within a cavity formed by the maintaining member and fixing board, creating a partially enclosed structure. This nesting approach provides accessibility for nozzle maintenance while reducing the exposed surface area of the adhesive, thereby minimizing moisture evaporation.
Solution Approach 2:
The maintaining member and fixing board form a shell-like cavity that encloses the head main body. This shell structure protects the adhesive from direct environmental exposure while maintaining accessibility to the nozzle openings, reducing moisture evaporation without compromising ease of operation.
3Device complexity
If the structure is simplified without a fixing board, then device complexity is reduced, but structural rigidity decreases
Solution Approach 1:
The patent segments the supporting structure into distinct components: the maintaining member with its cavity and the separate fixing board with bending portions. This segmentation allows each component to perform its specific function (maintaining member for housing, fixing board for rigidity) while keeping the overall design relatively simple.
Solution Approach 2:
The fixing board incorporates bending portions (curved structures) that provide structural reinforcement and rigidity. These curved geometries efficiently distribute stresses and enhance the overall structural strength without requiring additional complex components.
Data Source
AI summary
A liquid ejecting head includes: a head main body for ejecting liquid from nozzle openings on a liquid ejecting surface provided with the plurality of nozzle openings; a maintaining member which is adhered to the head main body at a surface side opposite to the liquid ejecting surface side of the head main body in a direction perpendicular to the liquid ejecting surface; and a fixing board which is provided at a side opposite to the maintaining member with respect to the head main body. The fixing board includes a bending portion which is bent to the head main body side. The bending portion is adhered to a side surface of the maintaining member. The head main body is disposed in a space formed by adhering the maintaining member and the fixing board to each other.