Self-Lifting Spring Fingers for Electrostatic Ink Nib Fabrication
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Solution Overview
Problem
Current print head fabrication schemes for digital printing with liquid inks do not lend themselves to batch fabrication and require well-defined electrostatic field concentrators that can be precisely and uniformly positioned, which is challenging for achieving excellent printing characteristics.
Innovation Solution
A planar fabricated structure with self-lifting spring fingers and electrically insulating tether strips that lift out of the plane during etching, allowing for precise positioning and optimization of capillary and electrostatic forces, enabling batch production of high-precision electrostatic ink nibs or tips for marking devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional print head fabrication schemes are used, then individual tips can be created, but batch fabrication is not achieved and positioning precision deteriorates
Solution Approach 1:
The fabrication process is segmented into distinct planar fabrication steps followed by a release step that creates three-dimensional self-lifting spring fingers. This segmentation allows batch processing of multiple tips simultaneously on a planar substrate while maintaining precise relative positioning through the self-lifting mechanism that preserves spatial relationships during fabrication.
Solution Approach 2:
The invention transitions from planar fabrication to three-dimensional structure through the self-lifting spring finger mechanism. Tips are fabricated in a planar dimension for precise batch positioning, then release causes them to lift into the third dimension, creating the necessary electrostatic field concentrators while maintaining the precision achieved during planar fabrication.
2Reliability
If complex metal layer deposition and patterning are used to create CLAW structures, then electrostatic field concentrators can be formed, but fabrication complexity and cost increase
Solution Approach 1:
The invention replaces complex multi-layer metal deposition and patterning processes with a simplified planar fabrication approach followed by a release step. Instead of building three-dimensional CLAW structures through multiple sputtering and plating steps, the self-lifting spring fingers are created through stress-balancing in a planar process, then release causes automatic three-dimensional formation, significantly reducing fabrication complexity.
Solution Approach 2:
The self-lifting spring fingers utilize internal stress gradients to automatically form their three-dimensional structure upon release, without requiring complex external patterning or assembly steps. The structure serves itself by using deposited metal layers with controlled vertical stress gradients that cause automatic curling and lifting into the final functional configuration.
3Ease of manufacture
If multiple metal layers are deposited and patterned to form spring structures, then self-lifting fingers can be created, but metal consumption and fabrication time increase
Solution Approach 1:
The invention extracts only the essential stress-balancing metal layers needed for self-lifting functionality, removing unnecessary complex multi-layer deposition steps. By focusing on creating the minimum required stress gradient structure in a planar configuration that then self-lifts, metal consumption is reduced while maintaining the self-lifting spring finger formation capability.
4Ease of operation
If tips are fabricated with optimized internal structures for capillary and electrostatic forces, then marking fluid emission is improved, but fabrication precision requirements increase
Solution Approach 1:
The tip structures are fabricated in a planar configuration where precise internal structures for optimizing capillary and electrostatic forces can be created using standard planar fabrication techniques. The preliminary planar fabrication allows for precise control of tip geometry and internal structures before the release step, ensuring optimal marking fluid emission performance while maintaining achievable fabrication precision.
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 reduces metal consumption and costs, allows for more controlled emitter sharpness, and enables low-cost, high-precision, and mechanically stable emitters with varied heights and aperture support, enhancing printing efficiency and quality.
Implementation Method 1
A conducting nib or tip 102 extending slightly above the flowing liquid reservoir 104 is coated with liquid 106 by capillary forces
Implementation Method 2
A positive pulse 110 applied to the nib 102 propels the pigment particles toward the 'ground electrode'114 which extracts the concentrated particles in a droplet from the nib or tip 102
Data Source
AI summary
A fabricated structure for use with an associated marking device is provided. In one form, the fabricated structure includes a self-lifting spring finger having a nib for marking.