Liquid Ejection Head Layout for Heat Management
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Solution Overview
Problem
Existing liquid ejection heads face challenges in downsizing while maintaining reliability, particularly when the negative pressure control unit and electrical components are arranged on the same side of the electrical wiring substrate, leading to potential interference and ink agglomeration issues.
Innovation Solution
The liquid ejection head design positions the liquid storage portion on one side of the electrical wiring substrate, keeping it distant from the power supply terminal and other heat-generating components, ensuring that these components are not directly opposite each other, thereby reducing heat transfer to the ink storage area and preventing ink agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power input unit and negative pressure control unit are arranged on the same side with the electrical wiring substrate as a boundary to downsize the liquid ejection head, then the liquid ejection head size is reduced, but the electrical part and negative pressure control unit may interfere with each other
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial arrangement by positioning the liquid storage portion on the opposite side of the electrical wiring substrate from the electrical part. This dimensional reconfiguration allows both the power input unit/negative pressure control unit and the liquid storage portion to coexist on the same side without interference, resolving the contradiction between downsizing and component interference.
2Volume of moving object
If the electrical part generating heat is positioned close to the liquid storage portion for compact design, then the device size is reduced, but heat transfer to the ink storage area causes ink agglomeration
Solution Approach 1:
The electrical wiring substrate serves as a thermal barrier and intermediary layer between the heat-generating electrical part and the liquid storage portion. By positioning the liquid storage portion on the opposite side of the substrate from the electrical part, the substrate itself acts as insulation, preventing heat transfer to the ink while maintaining a compact overall device structure.
3Reliability
If the power input unit is arranged distant from the signal input unit to reduce noise influence, then noise interference is reduced, but the device complexity increases
Solution Approach 1:
The patent combines the power input unit and negative pressure control unit on the same side of the electrical wiring substrate, creating a functional cluster that reduces wiring complexity while maintaining noise resistance. This merging approach allows power and control signals to be routed through shared pathways, simplifying the overall wiring architecture compared to completely separate arrangements.
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 allows for a compact design while maintaining high-speed and high-image quality printing by preventing ink thickening and improving reliability by minimizing the risk of ink sticking to electrical components.
Implementation Method 1
an electrical part generating heat in a case where power input from the outside for ejecting liquid is controlled
Implementation Method 2
reducing heat transfer to the ink storage area
Data Source
AI summary
To provide a liquid ejection head capable of implementing both improvement of reliability and downsizing at the same time. The liquid ejection head comprises an element substrate ejecting liquid, an electrical wiring substrate electrically connected to the element substrate, and a liquid storage portion configured to store liquid to be supplied to the element substrate. On the first face of the electrical wiring substrate, an electrical part generating heat in a case where power input from the outside for ejecting liquid is controlled is provided. The liquid storage portion is provided on the first face side of the electrical wiring substrate. The electrical part and the liquid storage portion are not provided at positions opposite to each other in a case of being viewed from a direction perpendicular to the first face.