Potential Control Plate with Segmented Grid for Photoconductor Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing charging devices for image forming apparatuses face challenges in uniformly charging cylindrical or columnar photoconductors, leading to non-uniform image formation and potential leakage due to the lack of effective potential control and structural reinforcement in the charging system.
Innovation Solution
A charging device is designed with a discharge electrode extending along the axial direction of the photoconductor and a potential control plate curved along its peripheral surface, featuring structural lines and connecting beams that enhance the grid's strength and uniformity, reducing non-uniform charging and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple grid structure is used in the charging device, then the device complexity is reduced, but the manufacturing precision and uniformity of charge distribution deteriorate
Solution Approach 1:
The grid structure is segmented into multiple structural lines (first, second, third, and fourth structural lines) that are arranged in specific patterns. These segmented lines create multiple charging regions that work together to achieve uniform charge distribution across the photoconductor surface, resolving the contradiction between simple structure and precise charging uniformity.
Solution Approach 2:
Different regions of the grid are designed with different structural characteristics. The first and second structural lines are positioned to charge specific axial regions, while the third and fourth lines address other regions. This local differentiation ensures that each part of the photoconductor receives appropriate charging, achieving overall uniformity without requiring a uniformly simple structure throughout.
2Ease of manufacture
If a flat grid structure is used, then the ease of manufacture is improved, but the reliability and stability of charging performance deteriorate due to vibration and non-uniform charging
Solution Approach 1:
The grid structure is designed with curved surfaces that conform to the cylindrical shape of the photoconductor. This curvature ensures uniform spacing between the grid and the photoconductor surface throughout the charging process, preventing non-uniform charging and reducing vibration issues that would occur with a flat grid, while still maintaining manufacturability through standard curving techniques.
3Ease of manufacture
If the grid structure lacks reinforcing elements, then the ease of manufacture and device simplicity are improved, but the strength and handling ease deteriorate
Solution Approach 1:
The reinforcing ribs are merged with the functional structural lines of the grid. The first, second, third, and fourth structural lines serve dual purposes: they create charging regions and simultaneously provide structural reinforcement. This integration adds strength without requiring separate reinforcing elements, maintaining ease of manufacture while improving structural integrity and reducing vibration.
4Ease of manufacture
If the structural lines are identical throughout, then the ease of manufacture is improved, but the manufacturing precision and ability to prevent leakage deteriorate
Solution Approach 1:
The grid structure employs asymmetric positioning of structural lines, where the first and second structural lines are positioned differently from the third and fourth lines. This asymmetric arrangement creates varied charging patterns across different regions of the photoconductor, preventing charge accumulation in specific areas and reducing leakage, while still using identical line designs that are easy to manufacture.
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
The solution improves the uniformity of charge distribution on the photoconductor, increases the grid's strength for easier handling and reduced vibration, and prevents the cleaning member from being scratched, thereby enhancing the overall image forming process.
Implementation Method 1
a discharge electrode that extends along an axial direction of a member to be charged
Implementation Method 2
a potential control plate that is disposed between the member to be charged and the discharge electrode
Data Source
AI summary
A charging device includes a discharge electrode that extends along an axial direction of a member to be charged; and a potential control plate disposed between the member to be charged and the discharge electrode and curved along a peripheral surface of the member to be charged. The potential control plate includes three or more structural lines that are arranged in a circumferential direction of the member to be charged and that linearly extend along the axial direction, and connecting portions arranged in the axial direction, each connecting portion connecting two or more of the three or more structural lines to each other, the two or more structural lines being next to each other in the circumferential direction. The structural lines connected by one of the connecting portions and those connected by another one of the connecting portions are at least partly different from each other.