Modular Printhead Assembly Base and Substrate Design
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Solution Overview
Problem
The increasing length of printhead dies and decreasing spacing between ink feed slots in inkjet printing systems make them more fragile, necessitating a solution to enhance mechanical support and fluidic routing while maintaining high resolution.
Innovation Solution
A modular printhead assembly with a base and substrates that provide mechanical support and fluidic routing for the printhead die, featuring interchangeable substrates with varying material properties and fluidic geometries to minimize stress and optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the length of the printhead die is increased and the spacing between ink feed slots is decreased, then the number of nozzles and resolution are improved, but the fragility of the printhead die increases
Solution Approach 1:
The printhead assembly is divided into separate modular components: a base component and interchangeable substrate components. The substrate containing the printhead die is separated from the base, allowing the die to be replaced without replacing the entire assembly. This segmentation enables better protection of the fragile die while maintaining high resolution through precise fluidic routing in the substrate.
Solution Approach 2:
The invention allows changing material parameters of the substrate (such as using glass instead of polymer) to optimize both fragility resistance and resolution. Different substrate materials can be selected based on specific application requirements, enabling parameter optimization for the thin-film printhead die while maintaining manufacturing precision.
2Productivity
If the length of the printhead die is increased, then the print swath is improved, but the mechanical strength decreases
Solution Approach 1:
By separating the printhead die from the base into interchangeable substrate components, the design allows the long printhead die to be supported by a robust base structure. The substrate can be optimized for mechanical strength while the base provides additional structural support, enabling increased print swath without compromising mechanical strength.
Solution Approach 2:
The printhead assembly uses composite construction combining different materials for the base and substrate components. This allows optimization of each component for its specific function - the base for mechanical strength and the substrate for fluidic precision - thereby supporting longer printhead dies with increased print swath while maintaining overall mechanical strength.
3Manufacturing precision
If the spacing between ink feed slots is decreased, then the resolution is improved, but the potential for stress concentration increases
Solution Approach 1:
The substrate is designed with localized quality variations including reinforcement features and optimized fluidic passage geometries at critical stress points. This allows maintaining tight slot pitch for high resolution while locally enhancing stress resistance in areas prone to concentration, such as around fluidic passages and mounting interfaces.
Solution Approach 2:
Material parameters of the substrate can be optimized to reduce stress concentration while maintaining fine slot pitch. Different substrate materials with varying mechanical properties can be selected, and parameters such as thickness and material composition can be adjusted to minimize stress concentration effects in high-resolution configurations with decreased slot spacing.
Data Source
AI summary
A printhead assembly includes a base having a pocket formed therein, a substrate having at least one fluid passage formed therethrough received within the pocket of the base, and a printhead die supported by the substrate and communicated with the at least one fluid passage of the substrate.