Liquid Discharge Head Flow Path Geometry to Prevent Liquid Fixation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid discharge heads face issues with liquid concentration and fixation in the flow paths due to the configuration of the opening diameter conversion plate, which can lead to discharge failure.
Innovation Solution
The liquid discharge head incorporates an opening diameter conversion plate with inclined portions in the supply connection flow path to reduce bending and facilitate liquid flow, preventing accumulation and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the opening diameter conversion plate has a bent wall surface configuration, then the liquid can be concentrated from large-diameter flow path to minute discharge element substrate, but the liquid accumulates at the bending portion and may concentrate and fixate
Solution Approach 1:
The patent applies curvature by forming the wall surface of the supply connection flow path as an inclined surface rather than a bent surface. This curved/inclined geometry prevents liquid accumulation by eliminating sharp bending portions where liquid could pool and fixate, while still achieving the necessary diameter transition from the large-diameter supply flow path to the minute discharge element substrate.
Solution Approach 2:
The patent applies local quality by creating different wall surface characteristics in different regions of the opening diameter conversion plate. The supply connection flow path has an inclined wall surface to prevent accumulation, while other portions of the conversion plate maintain the necessary bending to achieve diameter conversion. This localized differentiation of surface properties solves the contradiction between concentration and discharge stability.
2Device complexity
If the connection flow path has no inclined portion, then the structure is simpler, but the liquid tends to accumulate at the bending portion
Solution Approach 1:
The inclined wall surface acts as a gradual curve that guides liquid flow smoothly from the large-diameter supply flow path to the minute discharge element substrate. This curved geometry eliminates sharp bends that cause accumulation, while the inclination itself provides a simple, continuous surface that prevents liquid pooling without requiring complex multi-segmented structures.
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 configuration effectively suppresses liquid accumulation and fixation, ensuring stable liquid discharge by concentrating the liquid from a large-diameter flow path to a minute discharge element substrate.
Implementation Method 1
a wall surface of the supply connection flow path includes an inclined portion inclining with respect to the first direction
Data Source
AI summary
A liquid discharge head includes a discharge element substrate and an opening diameter conversion plate. The discharge element substrate and the opening diameter conversion plate are laminated in a first direction. A second opening width is larger than a first opening width in a second direction orthogonal to the first direction. A supply connection flow path configured to connect a first opening and a second opening is formed in the opening diameter conversion plate. A wall surface of the supply connection flow path includes an inclined portion inclining with respect to the first direction.