Liquid Ejection Head Filter Reinforcement Gap Design
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Solution Overview
Problem
Conventional liquid ejection heads with filters in the nozzle array direction face issues with liquid stagnation and bubble discharge due to the design of reinforcement ribs and partition walls, leading to poor ejection performance.
Innovation Solution
The liquid ejection head incorporates filter portions with reinforcement parts that include a gap between filter holes and reinforcement parts, allowing for increased ink flow velocity and reduced bubble stagnation by forming filter holes to reach the vicinity of partition walls, enhancing the structural strength and bonding rigidity of the filter portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the filter portion is disposed between liquid inlet portions and common liquid chamber with reinforcement ribs, then the structural strength of the filter portion is improved, but liquid stagnation occurs on the liquid inlet portion side and bubble discharge becomes difficult
Solution Approach 1:
The patent applies local quality by making the reinforcement part extend beyond the partition wall in the liquid flow direction, creating a localized extension that specifically addresses the bubble stagnation problem at the liquid inlet portion side without compromising the overall filter structure. This local extension provides an additional pathway for bubble discharge while maintaining the necessary structural strength.
Solution Approach 2:
The filter portion is divided into multiple sections by partition walls, and the reinforcement part extends beyond these partition walls to create separate reinforcement sections. This segmentation allows each filter section to have independent structural support and bubble discharge pathways, preventing liquid stagnation in any single region.
2Device complexity
If the width of partition walls is less than the width of reinforcement ribs, then the filter portion can be divided into multiple filter sections, but stagnation of liquid occurs on the liquid inlet portion side
Solution Approach 1:
The filter portion is segmented into multiple filter sections by partition walls, allowing independent filtering for different nozzle groups. The reinforcement part extends beyond these partition walls to ensure each section has adequate structural support and bubble discharge capability, maintaining liquid flow velocity despite the segmented structure.
Solution Approach 2:
The reinforcement part extends in the liquid flow direction beyond the partition wall boundary, adding a dimensional extension that creates an additional bubble discharge pathway. This extension in the flow direction dimension compensates for the narrow partition walls and prevents liquid stagnation.
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 improves the ability to discharge bubbles and maintain high ink flow velocity, preventing stagnation and ensuring efficient liquid ejection by reinforcing the filter portions with a multiple-layer structure and strategically positioning reinforcement parts.
Implementation Method 1
a plurality of filter portions are disposed between the common liquid chamber and the liquid inlet portions, each of the plurality of filter portions including filter holes and filtering the liquid
Implementation Method 2
a plurality of nozzles to eject liquid drops; a plurality of individual liquid chambers communicating with the plurality of nozzles
Data Source
AI summary
A liquid ejection head includes a plurality of nozzles to eject liquid drops; a plurality of individual liquid chambers communicating with the plurality of nozzles; a plurality of liquid inlet portions leading to the plurality of individual liquid chambers; a common liquid chamber to supply liquid to the plurality of individual liquid chambers; and a plurality of filter portions disposed between the common liquid chamber and the liquid inlet portions, each of the filter portions including filter holes and filtering the liquid, wherein a plurality of reinforcement parts are provided to partition the plurality of filter portions, each of the reinforcement parts includes a part facing some of the filter holes of a corresponding one of the plurality of filter portions in a liquid flow direction, with a gap between the filter holes and the reinforcement part.