Liquid Ejection Head Substrate Supply Port Relocation
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Solution Overview
Problem
The existing liquid ejection heads face challenges in reducing the size of the substrate body while maintaining the amount of liquid supplied to the pressure chamber, leading to increased manufacturing costs and potential temperature variations that affect ejection consistency.
Innovation Solution
The substrate body is designed without a supply port, with the supply port formed in the second surface of the ejection port forming member, allowing for a reduced substrate size without decreasing liquid supply and ensuring sufficient cooling of the ejection port forming member to maintain consistent ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the supply port is formed in the substrate body, then the liquid supply path is simplified, but the substrate body size cannot be reduced
Solution Approach 1:
The supply port is relocated from the substrate body to the ejection port forming member, specifically to the second surface. This spatial reconfiguration allows the substrate body to be miniaturized while the liquid supply function is maintained through the flow passage formed in the ejection port forming member. The dimensionality change transforms the supply port location from a 2D surface on the substrate to a 3D structure within the ejection port forming member.
2Volume of moving object
If the substrate body size is reduced, then manufacturing cost decreases, but the amount of liquid supplied to the pressure chamber may be insufficient
Solution Approach 1:
The liquid supply system is segmented into distinct functional components: the substrate body, the ejection port forming member with integrated flow passage, and the supply port on the second surface. This segmentation allows each component to be optimized independently - the substrate body can be miniaturized while the ejection port forming member maintains adequate liquid supply capacity through its dedicated flow passage structure.
3Reliability
If the ejection port forming member is sufficiently cooled, then ejection consistency is maintained, but manufacturing complexity increases
Solution Approach 1:
The ejection port forming member is designed to serve multiple functions simultaneously: it forms the pressure chamber, provides the ejection port, creates the flow passage for liquid supply, and acts as a cooling structure. By integrating these functions into a single component, the patent achieves effective cooling for ejection consistency without adding separate cooling devices, thereby avoiding increased manufacturing complexity.
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 reduces the substrate size without compromising liquid supply, lowers manufacturing costs, and minimizes temperature variations among ejection ports, resulting in consistent liquid ejection.
Implementation Method 1
an energy generating device provided on a substrate body, the energy generating device generating energy for ejecting liquid
Implementation Method 2
a supply port formed in the second surface... configured to supply the liquid to the pressure chamber
Data Source
AI summary
A device substrate includes a substrate body having an energy generating device provided thereon, where the energy generating device generates energy for ejecting liquid, an ejection port forming member disposed on the substrate body, where the ejection port forming member has a pressure chamber that surrounds the energy generating device and an ejection port that communicates with the pressure chamber, and a supply port configured to supply the liquid to the pressure chamber. The ejection port forming member has a first surface that is in contact with the substrate body and a second surface other than the first surface, and the supply port is formed in the second surface.