Electrohydrodynamic Print Head Dielectric Feed Layer
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Solution Overview
Problem
Existing electrohydrodynamic print heads lack design versatility and manufacturing efficiency due to complex nozzle layers and silicon-based feed layers, which restrict customization and mass production.
Innovation Solution
A print head design utilizing a dielectric material for the feed layer instead of silicon, allowing for improved electrical insulation and mechanical properties, enabling easier customization and mass production by separating active and inactive nozzles through the feed layer, and simplifying the nozzle layer design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicon-based feed layer is used, then the print head can be manufactured with standard semiconductor processes, but the electrical insulation between ducts and conducting lines is insufficient and mechanical properties are limited
Solution Approach 1:
The patent changes the material parameter of the feed layer from silicon to dielectric material, which fundamentally improves electrical insulation properties while maintaining compatibility with semiconductor manufacturing processes. This parameter change resolves the contradiction by selecting a material that satisfies both insulation requirements and manufacturability constraints.
Solution Approach 2:
The patent employs composite material structures where the feed layer is formed as a multi-layer dielectric structure with embedded conductive elements. This composite approach allows optimization of both electrical insulation (through dielectric layers) and mechanical properties (through material composition), while maintaining ease of manufacture using standard semiconductor fabrication techniques.
2Adaptability or versatility
If the nozzle layer is highly customized to define active and inactive nozzles, then design versatility is improved, but manufacturing efficiency and mass production capability deteriorate
Solution Approach 1:
The patent segments the functionality into two independent layers: the nozzle layer (which remains standardized for mass production) and the feed layer (which contains the customized duct structures). By segmenting the design, the nozzle layer can be manufactured in large quantities using standard processes, while the feed layer is customized separately to define which nozzles are active, thus resolving the contradiction between design versatility and manufacturing efficiency.
Solution Approach 2:
The patent extracts the customization function from the nozzle layer and places it in the feed layer. The feed layer is separated as an independent component that defines active nozzles through its duct structure, allowing the nozzle layer to be standardized for mass production while the feed layer provides the necessary design flexibility.
3Adaptability or versatility
If the feed layer is designed to connect only a subset of nozzles to ink terminals, then customization capability is improved, but the structural complexity of the feed layer increases
Solution Approach 1:
The patent applies local quality by providing feed ducts only where needed - specifically, only for the subset of nozzles that are intended to be active. The feed layer structure is locally optimized: areas with active nozzles have corresponding feed ducts, while areas with inactive nozzles have no ducts. This reduces overall structural complexity compared to providing ducts for all nozzles, while still achieving full customization capability.
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 approach enhances design flexibility, reduces manufacturing complexity, and allows for the production of customized print heads with improved electrical insulation and mechanical properties, enabling efficient ink distribution and nozzle activation.
Implementation Method 1
the feed layer is, at least in part, of a dielectric material. Using a dielectric material instead of a silicon layer as a feed layer has the potential to improve design flexibility. It provides improved electrical insulation between the ducts and/or between any electrical vias or other conducting lines extending through the feed layer
Implementation Method 2
a plurality of nozzle electrodes for the electrohydrodynamic acceleration of ink to be ejected from the nozzles
Data Source
AI summary
The electrohydrodynamic print head includes a nozzle layer with a plurality of nozzles. A feed layer is arranged above nozzle layer. It contains feed ducts for feeding ink to the nozzles as well as electrically conducting feed lines for feeding voltages to electrodes at nozzles. The feed layer includes one or more dielectric sublayers, which is/are structured to form the feed ducts and feed lines. Some of the sublayers contain vertical via sections and others contain horizontal interconnect sections. The feed layer is structured for customizing the print head easily.