Printhead Channel Stacking for High-Viscosity Ink Printing
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Solution Overview
Problem
Existing printheads face challenges in achieving high native resolution printing, particularly with high viscosity inks, due to complex structural and electrical designs, which hinder efficient material transport and ejection.
Innovation Solution
The printhead design incorporates a simplified mechanical and electrical actuator design, a streamlined fluidic system, and a membrane to separate liquid from the actuator, allowing for efficient material cycling and ejection, with a scalable printhead structure that supports high native resolution printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a complex structural and electrical design is used in existing printheads, then certain functional requirements are met, but material transport efficiency deteriorates and structural complexity increases
Solution Approach 1:
The printhead is divided into multiple ejection units, each with its own actuator and fluidic channels. This segmentation allows independent optimization of each unit's material transport path, improving overall efficiency while maintaining manageable structural complexity through modular design
Solution Approach 2:
The patent introduces a vertical stacking arrangement where ejection units are arranged in layers with fluidic channels extending in multiple dimensions. This multi-dimensional fluidic architecture optimizes material transport paths without increasing the horizontal footprint, thereby improving efficiency without proportionally increasing structural complexity
2Manufacturing precision
If spacing between ejection units is reduced to achieve higher native resolution, then printing resolution improves, but structural complexity and manufacturing difficulty increase
Solution Approach 1:
Ejection units are arranged in a nested or stacked configuration where multiple units share common structural elements and fluidic pathways. This nesting allows reduced spacing between ejection openings while avoiding the need for completely separate support structures for each unit, thereby achieving higher resolution without proportional increases in manufacturing complexity
Solution Approach 2:
Common structural components and fluidic channels serve multiple ejection units simultaneously. This multi-functionality allows tighter spacing between ejection openings while using shared infrastructure, reducing the overall structural complexity that would otherwise be required to support individually spaced units
3Reliability
If actuator design is optimized for high viscosity ink ejection, then ejection capability improves, but electrical and mechanical complexity increases
Solution Approach 1:
The patent employs piezoelectric actuators that convert electrical signals directly into mechanical displacement, replacing more complex mechanical actuation systems. This substitution provides precise control over ejection forces needed for high viscosity inks while simplifying the overall actuator design through direct electro-mechanical conversion
Solution Approach 2:
The actuator design optimizes specific parameters such as piezoelectric material selection, electrode configuration, and chamber geometry to achieve the required ejection forces for high viscosity inks. By carefully tuning these parameters rather than increasing overall system complexity, the patent achieves reliable high viscosity ejection with a relatively simple actuator structure
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 design enables high viscosity ink printing with improved efficiency and reduced spacing between ejection units, achieving higher native resolution and reduced complexity, while maintaining efficient drop ejection and material flow.
Implementation Method 1
The actuator comprises a piezoelectric element. The piezoelectric element is connected to the electrical connector via a flexible printed circuit board
Data Source
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AI summary
A printhead for a printer comprising: a first housing element comprising at least two first channel structures, wherein the first channel structures extend in a first direction and are configured to transport a liquid material; a second housing element arranged under the first housing element and comprising a plurality of second channel structures, wherein the second channel structures extend in a second direction, which is essentially perpendicular to the first direction, and are configured to transport the liquid material. Wherein each second channel structure overlaps a portion of one of the first channel structures and a portion of at least one further first channel structure for liquid communication of the liquid material between the two portions of the two or more first channel structures.