Inkjet Printhead Thermal Conduction Path for Heat Dissipation
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Solution Overview
Problem
The heat generated within the fluid chamber of inkjet printheads can affect the operation of the printhead, leading to inefficiencies in ink ejection and printing quality.
Innovation Solution
A multi-layered printhead assembly is designed with a thermal conduction path between the fluid chamber and barriers, which helps in dissipating the heat generated by the firing resistor, and includes a substrate and thin-film structure with conductive and insulative layers to manage thermal gradients and enhance heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a firing resistor is used to generate heat within the fluid chamber to develop bubbles for ink ejection, then ink drop formation is improved, but heat accumulates in the printhead affecting operation and printing quality
Solution Approach 1:
The patent extracts the harmful heat from the fluid chamber by introducing a thermal conduction path that leads heat away from the ink ejection zone. The thermal conduction path acts as a heat extraction mechanism, separating the heat generation function (firing resistor) from the ink ejection function, thereby preventing heat accumulation while maintaining bubble formation efficiency.
Solution Approach 2:
The thermal conduction path serves as an intermediary element between the fluid chamber and the external environment. It mediates heat transfer by providing a controlled thermal pathway that conducts heat away from the printhead without directly interfering with the ink ejection process, thus resolving the contradiction between heat generation for bubble formation and heat accumulation problems.
2Temperature
If thermal conduction path is added to dissipate heat from fluid chamber, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent merges the thermal conduction path with existing printhead structural elements rather than adding completely separate components. The thermal conduction path is integrated into the printhead body or adjacent structures, combining heat dissipation functionality with structural support functions, thereby minimizing the increase in device complexity while achieving effective heat dissipation.
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 minimizes thermal gradients and effectively dissipates heat, improving the reliability and consistency of ink ejection, thereby enhancing printing quality and reducing operational issues.
Implementation Method 1
a thermal conduction path extended between the fluid chamber and the barriers
Implementation Method 2
the drops of ink are developed by a firing resistor which generates heat within a fluid chamber
Data Source
AI summary
A fluid ejection assembly includes a first layer, and a second layer positioned on a side of the first layer. The second layer has a side adjacent the side of the first layer and includes barriers defining a fluid chamber on the side, a drop ejecting element formed within the fluid chamber, and a thermal conduction path extended between the fluid chamber and the barriers.