Liquid Ejecting Head Nozzle Face Liquid Repellent Segmentation
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Solution Overview
Problem
In liquid ejecting heads, ink tends to attach to the nozzle face due to charging issues caused by liquid-repellent layers, leading to clogging and staining, which existing configurations struggle to effectively prevent.
Innovation Solution
A liquid ejecting head design featuring a first region with a liquid-repellent property and a second region with a lower liquid-repellent property, where the second region is positioned to intersect the movement direction of the nozzle face, reducing charging and ink attachment by utilizing air flow directionally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a liquid-repellent layer is formed to surround each nozzle over the entire periphery, then liquid repelling property is improved, but ink charging and attachment to nozzle face worsens due to negative polarity charging
Solution Approach 1:
The liquid-repellent layer is segmented into a first region surrounding each nozzle and a second region extending therefrom, with different liquid repelling properties in each segment. This segmentation allows the first region to provide strong liquid repelling force while the second region with lower liquid repelling property reduces ink charging, thereby preventing ink attachment to the nozzle face
Solution Approach 2:
Different regions of the liquid-repellent layer are assigned different liquid repelling properties. The first region has a first liquid repelling property optimized for preventing liquid attachment, while the second region has a second liquid repelling property that is lower, creating a gradient that reduces ink charging effects and prevents harmful ink attachment to the nozzle face
2Area of stationary object
If the liquid-repellent layer is connected to the peripheral edge of the nozzle in the entire periphery, then liquid repelling coverage is improved, but effectiveness in suppressing ink attachment worsens due to insufficient charging suppression
Solution Approach 1:
The liquid-repellent layer is divided into regions with different liquid repelling properties. The first region provides comprehensive coverage around the nozzle, while the second region extending from the first region has a lower liquid repelling property that specifically addresses ink charging issues, thereby improving overall reliability in suppressing ink attachment
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 configuration effectively suppresses ink attachment to the nozzle face, preventing clogging and staining while maintaining efficient ink ejection characteristics.
Implementation Method 1
a liquid-repellent film which configures the nozzle face
Implementation Method 2
Since air in the vicinity of the nozzle face flows in the first direction in which the nozzle face moves relatively to the medium
Data Source
AI summary
A liquid ejecting head includes a nozzle face on which nozzles which eject liquid onto a medium are formed; a first region with a liquid repelling property which is connected to a peripheral edge of the nozzle when planarly viewed; and a second region with a liquid repelling property lower than that in the first region, which is connected to a peripheral edge of the nozzle when planarly viewed.