Liquid Ejection Head Adhesive Wall Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid ejection head configurations face challenges in preventing the sealing material from extending and coming into contact with the recording device substrate, particularly when using adhesives with high thixotropy, which can lead to deformation and affect recording quality due to increased distance between the ejection port surface and the recording medium.
Innovation Solution
A method involving a support member with a concave portion and a convex portion having a step shape, where the adhesive is applied to the concave and first surface of the convex portion to fill the gap between the recording device substrate and the convex portion, forming a wall portion that inhibits the sealing material's extension while minimizing adhesive protrusion from the ejection port surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied to the top surface of the convex portion to form a wall portion, then the sealing material is prevented from extending toward the side surface of the recording device substrate, but the adhesive protrudes toward the recording medium and increases the distance between the ejection port surface and the recording medium
Solution Approach 1:
The convex portion is designed with a stepped structure having two different heights (first height and second height). The first surface is at a first height and the second surface is at a second height higher than the first height. This dimensional variation allows the adhesive to be applied selectively to different levels, forming a wall portion that prevents sealing material extension while controlling adhesive protrusion toward the recording medium.
Solution Approach 2:
Different surfaces of the convex portion have different heights to serve different functions. The first surface (at first height) provides a platform for adhesive application that prevents sealing material extension, while the second surface (at second height) controls the amount of adhesive protrusion toward the recording medium. This local differentiation of surface properties resolves the contradiction between sealing effectiveness and recording quality.
2Stability of the object's composition
If adhesive with high thixotropy is used to bond the recording device substrate and support member, then the adhesive maintains its shape well, but the effect of forming the wall portion by capillary force is small
Solution Approach 1:
The convex portion with stepped surfaces is prepared in advance before adhesive application. The specific geometry of the convex portion (with first and second surfaces at different heights) is pre-formed to guide the adhesive flow and capillary action. This preliminary structural preparation compensates for the reduced capillary force effect in high thixotropy adhesives, enabling effective wall portion formation while maintaining adhesive shape stability.
Solution Approach 2:
The invention changes the geometric parameters of the convex portion by introducing a stepped structure with two different heights. This parameter modification creates favorable conditions for adhesive distribution, allowing high thixotropy adhesives to form adequate wall portions despite reduced capillary force, while maintaining the shape stability that high thixotropy provides.
3Reliability
If the adhesive is applied to form a sufficient wall portion to prevent sealing material extension, then the sealing effectiveness is improved, but the adhesive may protrude from the ejection port surface and affect recording quality
Solution Approach 1:
The convex portion utilizes vertical dimensionality with two distinct height levels (first height and second height). This multi-level structure allows the adhesive to form a wall portion of sufficient height to contain sealing material while limiting the horizontal protrusion toward the ejection port surface. The stepped geometry creates a balance between vertical containment and horizontal restraint.
Solution Approach 2:
The different surfaces of the convex portion (first surface at first height, second surface at second height) provide localized functional zones. The first surface area allows adequate adhesive application for sealing containment, while the second surface area (at higher elevation) restricts excessive adhesive protrusion toward the recording medium, thus locally optimizing both sealing effectiveness and recording quality.
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 approach effectively forms a robust wall portion that prevents the sealing material from contacting the recording device substrate's side surface, maintaining the recording quality by ensuring the adhesive does not protrude and affecting the ejection process.
Implementation Method 1
an adhesive applied to the support member to bond the recording device substrate and the support member flows between the recording device substrate and the convex portion by being pressed by the recording device substrate when the recording device substrate is bonded to the support member
Data Source
AI summary
There is provided a method of manufacturing a liquid ejection head. The liquid ejection head includes a recording device substrate, an electric wiring member configured to be connected to the recording device substrate at an electric connection portion, and a support member including a concave portion and a convex portion. The convex portion includes a first surface and a second surface. The method includes applying an adhesive to the surface of the concave portion on which the recording device substrate is to be placed and to the first surface, pressing the applied adhesive after the recording device substrate is placed on the surface of the concave portion on which the recording device substrate is to be placed, to fill, with the adhesive, a gap between the convex portion and the recording device substrate to a position higher than the first surface, and sealing the electric connection portion.