Electrostatic Print Head Aperture Geometry for Resolution
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Solution Overview
Problem
Prior art charge deposition print heads suffer from non-uniformity in charge particle output and limited resolution due to varying voltage requirements for charge particle generation, especially at diameters smaller than 100 microns, which restricts high-resolution printing and light tone capabilities.
Innovation Solution
The print head design incorporates a discharge aperture geometry with an undercut region parallel to the insulating layer, optimizing the external electric field strength and reducing the discharge threshold voltage, allowing for smaller aperture diameters and improved uniformity, enabling higher resolution and better light tone printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the discharge aperture diameter is reduced to increase resolution, then the resolution is improved, but the discharge voltage rises and non-uniformity effects become severe
Solution Approach 1:
The discharge aperture is designed with non-uniform geometry, specifically an undercut structure where the aperture width varies along its depth. The aperture has a larger opening at the discharge electrode surface and narrows toward the insulating layer, creating different local dimensions within the same aperture. This local variation in geometry allows the aperture to maintain smaller effective discharge dimensions for higher resolution while the larger opening area compensates for voltage requirements and improves charge particle output uniformity.
2Manufacturing precision
If the discharge aperture diameter is reduced to enable light tone printing, then the light tone capability is improved, but the discharge voltage rises making it difficult to initiate charge particle generation
Solution Approach 1:
The aperture geometry parameters are changed from a simple cylindrical shape to an undercut structure with varying cross-sectional dimensions. By changing the geometric parameters - specifically making the aperture width at the discharge surface larger than the width at the insulating layer interface - the system achieves lower discharge voltage requirements while maintaining the small effective aperture size needed for light tone printing capability.
Data Source
AI summary
A print head includes a first electrode layer including a plurality of generator electrodes, a second electrode layer including a plurality of discharge electrodes, and an insulating layer disposed between the generator electrodes of the first electrode layer and the discharge electrodes of the second electrode layer. The discharge electrodes include at least one discharge aperture extending therethrough. Each discharge aperture has an undercut region defining a discharge surface spaced from and substantially parallel to an opposed surface of the insulating layer.