Liquid Ejection Head Substrate With Wavy Partition Wall
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Solution Overview
Problem
In liquid ejection heads with independent and common liquid chambers, reducing the refill distance to enable high-speed recording without compromising the mechanical strength of the partition wall is challenging, as decreasing the partition wall width leads to decreased mechanical strength and potential damage from vibration and impact.
Innovation Solution
A liquid ejection head substrate design featuring a partition wall with a width smaller than the distance between independent liquid chambers, and a shape that is regularly inflected in the arrangement direction, such as a wavy or zigzag shape, to maintain mechanical strength while reducing the refill distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of the partition wall is decreased to reduce the refill distance, then the refill distance is reduced enabling high-speed recording, but the mechanical strength of the partition wall decreases making it susceptible to damage from vibration and impact
Solution Approach 1:
The partition wall is designed with a curved shape in the thickness direction rather than being flat. This curvature provides structural reinforcement that maintains mechanical strength while allowing the partition wall width to be reduced, thereby reducing the refill distance without compromising structural integrity.
Solution Approach 2:
The partition wall's geometric parameters are optimized by introducing curvature in the thickness direction. This parameter change transforms the partition wall from a simple flat structure to a reinforced curved structure, enabling it to maintain strength with reduced width.
2Productivity
If the width of the partition wall is decreased to reduce the refill distance, then the refill distance is reduced for high-speed printing, but the yield during manufacturing process decreases
Solution Approach 1:
The curved shape of the partition wall in the thickness direction provides structural reinforcement that compensates for the reduced width, maintaining manufacturing yield by preventing defects that would occur with overly thin partition walls.
3Productivity
If the width of the partition wall is decreased to reduce the refill distance, then the refill distance is reduced for high-speed recording, but the liquid ejection head becomes more susceptible to damage from vibration and impact
Solution Approach 1:
The partition wall is designed with a curved shape in the thickness direction, which provides structural reinforcement and improves resistance to external forces such as vibration and impact, thereby enhancing reliability while maintaining the reduced width for high-speed recording.
Data Source
AI summary
Provided is a liquid ejection head substrate, in which a plurality of units are arranged. Each of the units includes: a pressure generating element formed on a first surface of a support substrate; and a pair of independent liquid chambers, which are formed on both sides of the pressure generating element so as to be opposed to each other, and are opened to the first surface of the support substrate. The liquid ejection head substrate includes, in the support substrate: a first common liquid chamber communicating to a plurality of independent liquid chambers on one side of the pair of independent liquid chambers; a second common liquid chamber communicating to a plurality of independent liquid chambers on another side of the pair of independent liquid chambers; and a partition wall separating the first common liquid chamber and the second common liquid chamber from each other.