Segmented Pixel Electrode for Lower Voltage Electrophotographic Imaging
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Solution Overview
Problem
Electrographic printers face increased costs and complexity due to the handling of large voltages required to charge pixels for forming images, which complicates the electrophotographic printing process.
Innovation Solution
The use of a two-dimensional array of pixels with a specific electrode and bias element configuration, along with switching devices, allows for the creation of strong electrostatic fields with lower voltage differentials, reducing the need for high voltages and enhancing resolution and cost efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If large voltages are used to charge pixels for forming images, then strong electrostatic fields are achieved for image creation, but device complexity and cost increase due to handling large voltages
Solution Approach 1:
The pixel electrode is divided into multiple segments (first electrode portion, second electrode portion, third electrode portion) arranged in a specific pattern. This segmentation allows the electrode to create strong electrostatic fields locally while using lower overall voltages, as each segment contributes to the field in a controlled manner rather than requiring a single high-voltage electrode
Solution Approach 2:
The patent applies different electrode configurations to different regions of the pixel. The first electrode portion is positioned closer to the photoconductive layer than the second and third portions, creating localized variations in electric field distribution. This local quality approach enables strong fields where needed while maintaining lower overall voltage requirements
Solution Approach 3:
The patent transitions from conventional planar electrode arrangements to a three-dimensional configuration with electrode portions at different heights and positions relative to the photoconductive layer. By utilizing vertical dimensionality (different distances from the photoconductive surface), the patent achieves stronger electrostatic fields without proportionally increasing voltage, as the field strength is enhanced by proximity rather than voltage magnitude
2Power
If large voltages are used to charge pixels, then image formation is enabled, but manufacturing cost increases due to voltage handling requirements
Solution Approach 1:
The patent changes the geometric parameters of the electrode structure (positions, distances, arrangements of electrode portions) to optimize the electrostatic field generation. By adjusting these physical parameters rather than relying on high voltage, the system achieves the same or better performance with lower voltage differentials, reducing manufacturing costs associated with high-voltage components and safety requirements
3Manufacturing precision
If conventional electrode configurations are used, then simple structure is maintained, but resolution and image quality are limited
Solution Approach 1:
The pixel electrode is segmented into multiple distinct portions (first, second, and third electrode portions) with specific spatial relationships. This segmentation enables independent control of electric field distribution across different regions of the pixel, allowing for sharper image edges and better resolution by precisely controlling where toner is attracted, while the segmentation itself is achieved through standard thin-film fabrication techniques
Solution Approach 2:
The patent utilizes vertical positioning of electrode portions at different distances from the photoconductive layer to enhance resolution. By controlling the vertical dimension (distance from photoconductive surface), the patent achieves better field confinement and sharper image edges without requiring excessively complex lateral electrode patterns, thus improving resolution with moderate complexity
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 configuration enables the formation of strong electrostatic fields necessary for image creation with lower voltage requirements, resulting in a more compact, cost-effective, and high-resolution image forming apparatus.
Implementation Method 1
configured to have a voltage applied thereto and to be charged so as to cooperate with developer 24 to form differing electrostatic fields across a surface of imager 26
Implementation Method 2
Based upon the voltage differential between each individual pixel 40, 140 and developer 24, the printing material, supplied by developer 24, is electrostatically attracted or repelled from individual pixels 40, 140
Data Source
AI summary
Various embodiments and methods relating to a pixel are disclosed.