Liquid Ejection Head Adhesive Substrate Deformation
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Solution Overview
Problem
Existing liquid ejection heads face issues with damage to the print element substrate due to adhesive agents, which can cause deformation and miniaturization limitations, as the adhesive agent spreads and swells, pushing the substrate inward and potentially leading to cracks.
Innovation Solution
The design incorporates a print element substrate with a supply port opposed to the support member, featuring a first surface surrounding the supply port and a second surface retracted from the support member, with the adhesive agent filled in spaces between these surfaces, reducing the amount of adhesive agent on the outer wall and minimizing the risk of deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive agent is pressed by the print element substrate during adhesion, then reliable adhering is achieved, but the adhesive agent spreads to the outer wall of the print element substrate and causes deformation or damage
Solution Approach 1:
The patent applies different surface qualities to different regions of the print element substrate. The first surface (adhered surface) has a flat structure for reliable adhesion, while the second surface (outer wall region) is recessed to prevent adhesive accumulation. This local differentiation allows the substrate to achieve both strong adhesion and protection against adhesive-induced deformation.
2Object-affected harmful factors
If a groove portion is provided outside the adhered surface to reduce adhesive spreading, then substrate damage is reduced, but the miniaturization of the print element substrate is limited
Solution Approach 1:
Instead of adding a groove portion that extends in the planar dimension (which would increase substrate size), the patent creates a recessed second surface that extends in the vertical dimension (thickness direction). This dimensional transformation allows the substrate to accommodate adhesive without increasing its footprint, enabling miniaturization while preventing damage.
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 reduces the risk of substrate damage and allows for miniaturization of the liquid ejection head by distributing the adhesive agent in a way that minimizes the pushing force on the substrate, enhancing adhering reliability and preventing deformation and breakage.
Implementation Method 1
an adhesive agent provided between the first print element substrate and the support member for adhering the first print element substrate to the support member
Implementation Method 2
The adhesive agent absorbs the liquid and swells to push the print element substrate
Data Source
AI summary
A liquid ejection head includes a print element substrate having an ejection port for ejecting a liquid; a support member supporting the print element substrate; and an adhesive agent provided for adhering the print element substrate to the support member. The print element substrate includes a supply port opposed to the support member and communicating with the ejection port, a first surface opposed to the support member and surrounding the supply port, and a second surface opposed to the support member and provided along at least a part of an outer edge of the first surface and retracted from the first surface relative to the support member. The adhesive agent is filled in a first space between the first surface and the support member, and at least a part of a second space between the second surface and the support member.