Liquid Ejecting Head Filter Resistance Equalization
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Solution Overview
Problem
In liquid ejecting systems, the presence of filters in individual supply flow paths leads to varying flow path resistances and pressure losses, resulting in inconsistent ink supply to multiple liquid ejecting portions, necessitating larger filters and potentially inadequate ink distribution.
Innovation Solution
A liquid ejecting head design with filters in individual supply flow paths where the flow path resistance and pressure loss in each filter are maximized, ensuring consistent pressure losses across filters, allowing for uniform ink distribution and reduced variability in supply to multiple liquid ejecting portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is installed in the common supply flow path, then foreign matters or air bubbles are captured, but a large filter is needed and flow path resistance varies across individual supply flow paths
Solution Approach 1:
The patent divides the single common filter into multiple individual filters, each installed in separate individual supply flow paths. This segmentation allows each filter to be smaller while collectively providing the same filtration function, and enables independent flow resistance control for each liquid ejecting portion.
Solution Approach 2:
The patent applies different flow path resistance characteristics to different individual supply flow paths by installing filters with specifically designed resistance values. This allows each filter to be optimized for its specific flow path requirements, ensuring uniform liquid supply despite variations in flow path lengths and configurations.
2Manufacturing precision
If flow path resistance in individual supply flow paths is not equalized, then the amount of liquid supplied to each liquid ejecting portion differs, but increasing filter size increases device complexity
Solution Approach 1:
The patent changes the flow path resistance parameter of each filter to achieve uniform liquid supply. By carefully selecting and adjusting the resistance values of individual filters, the system compensates for variations in flow path characteristics and ensures equal liquid distribution to all ejecting portions.
3Quantity of substance
If a large filter is installed in the common supply flow path, then sufficient liquid is supplied to multiple liquid ejecting portions, but the filter size and device complexity increase
Solution Approach 1:
The patent segments the liquid supply into multiple parallel flow paths, each with its own filter. This allows the total filtration capacity to be distributed across multiple smaller filters rather than requiring one large filter, reducing the maximum filter area while maintaining sufficient liquid supply to all ejecting portions.
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 ensures consistent ink supply to all liquid ejecting portions, reducing differences in ink distribution and allowing for smaller filter sizes, thereby improving the reliability and efficiency of the ink ejection process.
Implementation Method 1
a filter that captures foreign matters or air bubbles mixed in the liquid
Data Source
AI summary
A liquid ejecting head including a first-liquid ejecting portion, a second-liquid ejecting portion, a common supply flow path being supplied a liquid from a liquid reservoir, a first-individual supply flow path communicating the common supply flow path and the first-liquid ejecting portion to each other, a second-individual supply flow path communicating the common supply flow path and the second-liquid ejecting portion to each other, a first-filter provided in the first-individual supply flow path, and a second-filter provided in the second-individual supply flow path. In the liquid ejecting head, regarding flow path resistance in the first-individual supply flow path, flow path resistance in the first-filter is the largest, regarding flow path resistance in the second-individual supply flow path, flow path resistance in the second-filter is the largest, and the flow path resistance in the first-filter and the flow path resistance in the second-filter are the same.