Liquid Ejection Head Stress Relaxation via Metal Plate Segmentation
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Solution Overview
Problem
The existing production methods for liquid ejection heads generate internal stress during press working, leading to clearances between plates that allow moisture to enter and cause issues during thermal joining, potentially damaging the liquid-repellent film and affecting ejection performance.
Innovation Solution
A laminated body with a resin ejection nozzle plate and a metal plate featuring through-slits adjacent to projection parts, which are formed by curving and projecting the metal plate towards the resin plate, helps relax internal stress and prevent moisture ingress, ensuring stable ejection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If press working is performed to form projection parts on the laminated body, then the projection parts are formed to protect the liquid-repellent film, but internal stress is generated causing clearances between plates
Solution Approach 1:
The invention introduces through-slits that divide the metal plate into multiple segments. These slits allow the metal plate to deform independently in different regions during press working, distributing the internal stress and preventing the formation of clearances between the resin plate and metal plate while still forming the necessary projection parts.
Solution Approach 2:
The through-slits are formed in the metal plate before the press working process. This preliminary action prepares the metal plate to accommodate the stress that will be generated during subsequent press working, allowing the projection parts to form without creating harmful clearances between the bonded plates.
2Shape
If clearances are formed between plates during press working, then projection parts can be formed, but moisture can enter through the resin plate and expand during thermal joining
Solution Approach 1:
The through-slits segment the metal plate structure, allowing controlled deformation that forms projection parts while preventing the formation of continuous clearances that would allow moisture infiltration. The slits create a stress distribution pattern that maintains plate integrity.
Solution Approach 2:
The invention converts the potentially harmful internal stress generated during press working into a beneficial effect. By introducing through-slits, the stress is redirected to form the desired projection parts while simultaneously preventing clearance formation, thus converting what would be a defect into a functional feature.
3Strength
If the laminated body is curved and projected to form dome-shaped projection parts, then protection against paper jam is improved, but internal stress causes release of the resin plate from the metal plate
Solution Approach 1:
The through-slits divide the metal plate into segments that can deform independently during the curving and projecting process. This segmentation allows the formation of dome-shaped projection parts with enhanced protection capability while distributing the internal stress to prevent plate release.
Solution Approach 2:
The through-slits are pre-formed in the metal plate before curving and projecting operations. This preliminary structuring enables the metal plate to undergo the necessary deformation to create protective dome shapes while maintaining bonding integrity with the resin plate throughout the process.
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
The through-slits in the laminated body effectively reduce internal stress and prevent moisture-related issues, enhancing the reliability and durability of the liquid ejection head by maintaining the integrity of the liquid-repellent film and ensuring consistent ejection performance.
Implementation Method 1
a plurality of through-slits formed in the second plate can relax the internal stress generated during the formation of a plurality of projection parts on a laminated body including a first plate and the second plate
Implementation Method 2
The laminated body has a plurality of projection parts formed along an array direction of the ejection nozzles and having a curved dome shape projecting in a direction from the second plate to the first plate, and the second plate has a plurality of through-slits formed adjacent to the projection parts
Data Source
AI summary
A liquid ejection head includes a laminated body including a first plate having a plurality of ejection nozzles for ejecting a liquid and made from a resin material and a second plate having a plurality of through-holes communicating with the corresponding ejection nozzles and made from a metal material. The laminated body has a plurality of projection parts formed along the array direction Y of the ejection nozzles and having a curved dome shape projecting in the direction from the second plate to the first plate. The second plate has a plurality of through-slits formed adjacent to the projection parts.