Liquid Ejecting Head Bypass Flow Layout for Stable Ink Circulation
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Solution Overview
Problem
In liquid ejecting heads, variations in pressure for circulating liquid occur when some nozzles are not ejecting ink, leading to inefficiencies in liquid circulation.
Innovation Solution
A liquid ejecting head design with a first substrate featuring individual flow passages, a second substrate with nozzles, and a bypass flow passage connecting common flow passages, along with a controller for controlling liquid ejection, to stabilize pressure and improve circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common supply flow passage and a single common discharge flow passage are used to circulate liquid through multiple individual flow passages, then the liquid ejecting head structure is simplified, but the pressure required for liquid circulation varies significantly when many nozzles are not ejecting ink
Solution Approach 1:
The patent segments the common flow passages into multiple parallel passages (first common supply flow passage, second common supply flow passage, first common discharge flow passage, second common discharge flow passage). This segmentation allows liquid to flow through multiple independent paths simultaneously, reducing the pressure required for circulation and improving circulation stability when many nozzles are inactive, while maintaining overall structural simplicity.
2Reliability
If many nozzles are not ejecting ink, then the liquid circulation pressure varies significantly, but adding more flow passages increases device complexity
Solution Approach 1:
The patent extracts and separates the common supply and discharge flow passages into distinct, parallel pathways. By taking out the common flow function and dividing it into multiple dedicated passages, the system achieves more stable liquid circulation when many nozzles are inactive, while the modular nature of the separation keeps the overall structure manageable.
3Reliability
If a bypass flow passage is added to connect common flow passages, then liquid circulation stability is improved and pressure requirements are reduced, but the device complexity increases
Solution Approach 1:
The patent merges the bypass flow passage with the common supply and discharge flow passages to create an integrated circulation system. The bypass passage connects the common supply flow passages and common discharge flow passages, allowing liquid to flow through multiple paths simultaneously. This merging approach improves circulation stability and reduces pressure requirements while maintaining a unified, manageable structure rather than adding separate independent components.
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
The design ensures smooth ink circulation and reduced variations in ejection characteristics, minimizing ink stagnation and air bubble presence, and enhancing printing quality.
Implementation Method 1
a first bypass flow passage that connects the first common flow passage and the second common flow passage are formed in the first substrate
Data Source
AI summary
A liquid ejecting head wherein a first common flow passage that is in shared communication with the plurality of individual flow passages and supplies a liquid to the plurality of individual flow passages, a second common flow passage that is in shared communication with the plurality of individual flow passages and collects a liquid from the plurality of individual flow passages, and a first bypass flow passage that connects the first common flow passage and the second common flow passage are formed in the first substrate, and the first substrate is comprised of a pressure compartment substrate in which the plurality of pressure compartments is formed and a communication plate that is provided between the pressure compartment substrate and the second substrate.