Liquid Flow-Path Member Recess Sections Adhesive Waviness
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Solution Overview
Problem
In liquid ejecting heads, the non-uniform thickness of adhesive layers due to the 'waviness phenomenon' leads to insufficient joining force and leakage of ink between liquid flow paths, as the adhesive can spread into the flow path and affect the ejection mechanism.
Innovation Solution
Forming recess sections on the joining surface between the substrates with specific distance intervals to control the adhesive thickness and prevent waviness, ensuring the adhesive is confined and uniformly distributed, thereby maintaining a small and uniform adhesive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adhesive is applied by transferring to achieve small thickness, then adhesive thickness is reduced to 10 μm or less, but waviness phenomenon occurs causing non-uniform thickness distribution
Solution Approach 1:
The patent introduces recess sections at specific locations between flow path sections to create local variations in the substrate surface. These recess sections have different depths and are positioned to control adhesive flow locally, ensuring uniform adhesive thickness despite the waviness phenomenon during transferring. The local quality modification allows the adhesive to be confined properly at critical areas while maintaining overall thinness.
Solution Approach 2:
The recess sections are pre-formed on the substrate before adhesive application. This preliminary structural preparation creates predetermined zones that guide and confine the adhesive during the transferring process, preventing the waviness phenomenon from causing non-uniform thickness. The recess sections act as pre-established constraints that shape the adhesive layer before joining occurs.
2Object-affected harmful factors
If adhesive thickness is made small to prevent leakage, then adhesive leakage is reduced, but joining force becomes insufficient at trough portions
Solution Approach 1:
The recess sections create local variations in adhesive distribution, with deeper recesses at positions where additional adhesive is needed to compensate for trough portions. This local quality adjustment ensures that critical joining areas receive sufficient adhesive volume and strength while other areas maintain thin adhesive layers to prevent leakage into flow paths.
Solution Approach 2:
The recess sections act as intermediary structures that mediate between the conflicting requirements of thin adhesive layers and sufficient joining strength. By providing localized adhesive reservoirs and confinement zones, the recess sections enable the adhesive to achieve both thin overall thickness and adequate local bonding strength.
3Strength
If substrates are joined with uniform adhesive thickness, then joining strength is sufficient, but adhesive spreads into flow path affecting ejection mechanism
Solution Approach 1:
The recess sections are strategically positioned and sized to create local adhesive confinement zones. The varying depths of recess sections allow differential adhesive control: areas near flow paths have shallower recesses to prevent intrusion, while other areas have deeper recesses to ensure adequate bonding strength. This local quality differentiation resolves the contradiction between uniform strength and leakage prevention.
Data Source
AI summary
A plurality of pressure chamber space sections are formed at an interval therebetween on a pressure chamber substrate. The shortest distance between an opening edge of one pressure chamber space section and an opening edge of the other pressure chamber space section of adjacent pressure chamber space sections in a joining surface of a pressure chamber substrate to a communication substrate is 50 μm or more. A recess section is formed to be separated from an ink flow path in a region interposed between these opening edges. At least one of the shortest distance between the opening edge of one pressure chamber space section and the recess section and the shortest distance between the opening edge of the other pressure chamber space section and the recess section is 30 μm or less.