Liquid Ejection Head Deaeration Channel for Stable Ejection
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Solution Overview
Problem
Bubbles entering liquid ejection heads during replacement or operation can lead to insufficient ejection pressure and liquid leakage, affecting the stability and performance of liquid ejection apparatuses.
Innovation Solution
A liquid ejection head design featuring a deaeration channel with a high Young's modulus connecting member (2.4 GPa or more) to connect the liquid and deaeration channels, ensuring effective bubble discharge through a head-side and main body-side connecting system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connecting member with sufficient strength is used to connect multiple tubes to the housing part, then the connection reliability is improved, but the housing part may deform due to the applied force
Solution Approach 1:
The patent changes the material parameter (Young's modulus) of the connecting member to be greater than that of the housing part. This parameter change ensures that the connecting member has sufficient strength for reliable connection while being stiff enough to prevent housing part deformation when connection forces are applied.
2Device complexity
If bubbles remain inside channels in the liquid ejection head, then the structure is simple, but the bubbles may expand in response to environmental changes causing liquid leakage
Solution Approach 1:
The patent extracts the harmful bubbles from the liquid channel by providing a dedicated deaeration channel that communicates with the liquid channel. This allows bubbles to be separated and discharged to the outside, preventing their expansion and the resulting liquid leakage while maintaining relatively simple overall structure.
3Reliability
If the liquid ejection head is designed with both liquid channel and deaeration channel, then bubble discharge capability is improved, but the number of connections required during replacement increases
Solution Approach 1:
The patent merges the liquid channel and deaeration channel connections through a single integrated connecting member. This connecting member simultaneously connects both tubes to the housing part, reducing the number of separate connection operations required during liquid ejection head replacement while maintaining effective bubble discharge capability.
Data Source
AI summary
A liquid ejection head includes an ejection port for ejecting the liquid, a housing part having a liquid channel through which the liquid to be supplied to the ejection port flows and a deaeration channel for discharging a bubble inside the liquid channel, and a head-side connecting member linked to the liquid channel and the deaeration channel and connectable to a main body-side connecting member. The liquid channel is linked to a supply tube through the head-side connecting member and the main body-side connecting member, and the deaeration channel is linked to a deaeration tube through the head-side connecting member and the main body-side connecting member. A Young's modulus of a material of the head-side connecting member is 2.4 GPa or more, which is greater than a Young's modulus of a material of the housing part.