Liquid Discharge Head Flow Path with Isotropic Adhesive Recesses
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Solution Overview
Problem
Existing flow path members in liquid discharge heads, such as inkjet recording heads, are prone to deformation, cracking, or damage due to the directional orientation of relief grooves for bonding adhesive, which weakens the substrate and disrupts the flow path or electrical connections.
Innovation Solution
A flow path member design featuring recessed portions that are non-through holes, formed as rectangular or elliptical columns with approximately isotropic shapes, which absorb excess bonding adhesive and maintain substrate strength by distributing adhesive evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relief grooves are formed with directional orientation to suppress bonding adhesive from flowing into flow paths, then bonding adhesive control is improved, but substrate strength deteriorates and deformation or cracking occurs
Solution Approach 1:
The invention transitions from symmetric directional grooves to asymmetric isotropic recessed portions. The recessed portions have substantially equal dimensions in all directions (isotropic shape), which eliminates the directional weakness that causes substrate deformation and cracking while still effectively controlling bonding adhesive flow into flow paths.
Solution Approach 2:
The invention applies local quality by creating recessed portions with specific isotropic geometries at strategic locations on the substrate surface. These recessed portions locally modify the substrate structure to control adhesive flow while preserving overall substrate strength, unlike directional grooves that create systematic weaknesses throughout the substrate.
2Quantity of substance
If relief grooves are formed to control bonding adhesive flow, then adhesive distribution is improved, but substrate structural integrity deteriorates
Solution Approach 1:
The invention replaces the asymmetric directional groove structure with symmetric isotropic recessed portions. This geometric transformation ensures that the substrate maintains uniform structural integrity in all directions while the recessed portions effectively capture and distribute bonding adhesive, preventing excessive adhesive flow without compromising substrate stability.
3Object-generated harmful factors
If directional relief grooves are used for bonding adhesive control, then adhesive flow suppression is improved, but manufacturing reliability deteriorates due to deformation and cracking
Solution Approach 1:
The invention eliminates the directional asymmetry of traditional relief grooves by implementing isotropic recessed portions with substantially equal dimensions in all directions. This geometric change removes the preferential weakness directions that lead to substrate deformation and cracking during handling and manufacturing, thereby improving manufacturing reliability while maintaining adhesive flow suppression capability.
Solution Approach 2:
The invention changes the geometric parameters of the adhesive control structures from directional grooves with specific orientation to isotropic recessed portions with equal dimensions in all directions. This parameter transformation fundamentally alters the structural weakness distribution, eliminating directional vulnerability while maintaining the functional ability to control bonding adhesive flow.
Data Source
AI summary
A flow path member includes a first substrate, a second substrate, bonding adhesive, and recessed portions. The first substrate has a first surface formed with an opening of a flow path. The second substrate has a second surface facing the first surface. The bonding adhesive bonds the first and second surfaces together. The recessed portions are formed in at least one of the first surface of the first substrate and the second surface of the second substrate. Each recessed portion is a hole configured to take up excess bonding adhesive and, as a non-through hole, does not extend through the entire thickness of a substrate. Each of the recessed portions extends into the first substrate or the second substrate as a rectangular column or an elliptical column and, when a shape of each recessed portion is viewed from the direction orthogonal to the first surface, the shape is approximately isotropic.