Electroconductive Roll Peak-Density Surface for Uniform Discharge
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Solution Overview
Problem
Image forming apparatuses face challenges in achieving uniform image quality due to uneven discharge between the charging roll and the photoconductor element, which is influenced by the surface roughness of the charging roll.
Innovation Solution
An electroconductive roll with a core member, a rubber base material, and a surface layer having a specific density of peaks, where the surface layer includes an electroconductive matrix with dispersed particles to enhance surface roughness and ensure uniform discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the surface roughness of the charging roll is increased to improve discharge uniformity, then image quality improves, but the surface becomes too rough causing non-uniform charging
Solution Approach 1:
The invention applies local quality by creating a surface layer with specific localized characteristics - a thickness of 0.01 to 0.06 μm that provides controlled surface roughness (Spd of 93,406 to 153,027 1/mm²) only at the charging interface, while the bulk rubber layer maintains smooth uniformity. This localized surface modification enables uniform discharge without the adverse effects of overall surface roughness
Solution Approach 2:
The invention utilizes parameter changes by precisely controlling the thickness of the surface layer (0.01 to 0.06 μm) and the density of peaks (Spd: 93,406 to 153,027 1/mm²) to optimize the balance between surface roughness for discharge uniformity and smoothness for overall charging uniformity. This parameter optimization resolves the contradiction between needing surface irregularities for discharge control and overall smoothness for uniform charging
2Manufacturing precision
If a surface layer with high peak density is applied to achieve uniform discharge, then charging uniformity improves, but the manufacturing complexity increases
Solution Approach 1:
The invention employs composite materials by combining a rubber base layer with a thin surface layer containing electroconductive particles and resin. This composite structure achieves the desired peak density (Spd: 93,406 to 153,027 1/mm²) and controlled thickness (0.01 to 0.06 μm) through material composition rather than complex mechanical processing, thereby improving charging uniformity while managing manufacturing 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
The solution effectively reduces image unevenness by maintaining a uniform charged state of the photoconductor element, resulting in high-quality image formation.
Implementation Method 1
the surface roughness of the charging roll
Implementation Method 2
an electroconductive matrix with dispersed particles to enhance surface roughness and ensure uniform discharge
Data Source
AI summary
An electroconductive roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The density of peaks Spd of the surface of the surface layer is equal to or greater than 93,406 (1/mm2), and is equal to or less than 153,027 (1/mm2).