Liquid Discharge Head Beam Projections Crack Prevention
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Solution Overview
Problem
The existing liquid discharge heads with beam-shaped projections to enhance stiffness face issues with cracking due to shrinking forces generated during the hardening process of thermosetting resin, leading to potential liquid leakage and reliability concerns.
Innovation Solution
A liquid discharge head design with beam-shaped projections where the interval between them is wider than the projections themselves, dispersing tensile stress evenly and preventing crack formation, and incorporating reinforcing ribs to enhance adhesion and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If beam-shaped projections are made with large volume to enhance stiffness, then the stiffness of the discharge port forming member is improved, but the shrinking force generated during hardening increases, leading to high tensile stress and potential cracking
Solution Approach 1:
The beam-shaped projections are segmented into multiple smaller projections rather than using large-volume single projections. This segmentation reduces the shrinking force generated by each individual projection while collectively maintaining the necessary stiffness enhancement, thereby preventing crack formation in the discharge port forming member
Solution Approach 2:
The dimensions and arrangement parameters of the beam-shaped projections are optimized to achieve the desired stiffness while controlling the shrinking force. By adjusting the number, size, and distribution of projections, the patent finds a balance between stiffness enhancement and crack prevention
2Strength
If the interval between beam-shaped projections is reduced to increase stiffness, then the structural rigidity is improved, but the tensile stress concentration during shrinkage increases, leading to crack occurrence
Solution Approach 1:
The patent applies different local qualities to different regions by varying the interval between beam-shaped projections. The interval is designed to be larger than the projection width, creating a specific stress distribution pattern that prevents stress concentration while maintaining overall rigidity. This local optimization prevents crack formation in high-stress regions
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 design effectively suppresses tensile stress and crack occurrence, maintaining reliability and preventing liquid leakage by evenly dispersing stress and enhancing the structural integrity of the discharge port forming member.
Implementation Method 1
The discharge port forming member 9 hardens in a thermally expanded state in a heat curing process and then shrinks as the temperature thereof decreases
Implementation Method 2
The discharge port forming member 9 hardens in a thermally expanded state in a heat curing process and then shrinks as the temperature thereof decreases
Implementation Method 3
The discharge port forming member 9 also shrinks by the drying during the hardening
Data Source
AI summary
A liquid discharge head including a substrate having a plurality of energy-generating elements which generates energy used to discharge a liquid, and a supply port which is a through-hole for supplying the liquid to the energy-generating elements and which extends along an arrangement direction of the plurality of the energy-generating elements; and a discharge port forming member having a plurality of discharge ports for discharging the liquid and a pair of beam-shaped projections which are parallel to each other, which project toward the substrate, and which are formed along the arrangement direction at positions opposing to the supply port, wherein an interval of the pair of beam-shaped projections is larger than a length of the pair of beam-shaped projections in a direction orthogonal to the arrangement direction of the pair of beam-shaped projections.