Layered Charging Roller Surface for Stable Imaging Charge
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Solution Overview
Problem
Existing charging members in electrophotographic imaging apparatuses suffer from electrical deterioration over time, leading to reduced charging performance and image defects such as background defects and micro-jitter, making it challenging to simultaneously satisfy both micro-jitter and 2D noise requirements.
Innovation Solution
A charging member comprising a conductive support, a conductive elastic body layer, and a surface layer, with specific materials and configurations to maintain uniform charging performance and durability, including a conductive elastic body layer with adjusted hardness and resistance values, and a surface layer with dispersed particles to enhance electrical conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional charging member is used, then initial charging performance is achieved, but charging performance deteriorates over time due to electrical deterioration and surface wear
Solution Approach 1:
The charging member is segmented into multiple functional layers: a conductive support layer, a conductive elastic body layer, and a surface layer with particles. This segmentation allows each layer to perform its specific function independently, with the surface layer being replaceable or regenerable, thus maintaining charging performance over time while extending operational lifetime.
Solution Approach 2:
The charging member uses composite materials combining conductive polymers, elastic bodies, and dispersed particles (such as metal or conductive oxide particles). This composite structure provides both the electrical conductivity needed for charging and the mechanical durability required for long-term operation, resolving the contradiction between reliability and duration.
2Manufacturing precision
If larger particles are used in the surface layer, then micro-jitter is reduced, but 2D noise increases
Solution Approach 1:
The surface layer incorporates particles with specifically controlled local properties including size distribution (1-35 μm), shape, and dispersion patterns. This local quality control allows the surface to provide micro-jitter reduction through appropriate particle sizes while maintaining 2D noise suppression through proper dispersion and size distribution, preventing both image defects simultaneously.
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 charging member maintains stable charging characteristics over a longer period, reducing image defects like background and micro-jitter, ensuring high-quality image output even under varying environmental conditions.
Implementation Method 1
a conductive elastic body layer with adjusted hardness and resistance values, and a surface layer with dispersed particles to enhance electrical conductivity and stability
Implementation Method 2
a conductive support, a conductive elastic body layer, and a surface layer, with specific materials and configurations to maintain uniform charging performance and durability
Implementation Method 3
a surface of the photoconductor is charged by applying a voltage to a conductive support (e.g., a shaft) using the charging roller to perform a micro discharge in the vicinity of a contact nip between the charging roller and the photoconductor
Data Source
AI summary
An example charging member has a conductive support; a conductive elastic body layer on the conductive support; and a surface layer on the conductive elastic body layer, wherein the surface layer includes a binder resin and particles, wherein the surface layer includes a first portion of the binder resin having the particles and a second portion of the binder resin having an absence of the particles, and wherein the second portion has a peak height (Spk)/core roughness depth (Sk) of less than 0.2.