Si-O-Al Outermost Layer for Electrophotographic Member Fogging
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Solution Overview
Problem
Existing electrophotographic members suffer from 'fogging' due to insufficient charging properties and high resistance decay, leading to poor image quality and adhesion issues during long-term use.
Innovation Solution
An electrophotographic member with a substrate and an outermost layer containing a compound with a Si—O—Al bond, featuring a structural unit represented by specific formulas, which enhances charging properties and electric resistance while providing high lubrication to prevent adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the developing member has high charging properties to prevent reversal developer, then fogging is prevented, but developer adhesion to the surface increases
Solution Approach 1:
The patent changes the chemical composition parameters of the outermost layer by incorporating specific compounds (silicon oxide, aluminum oxide, zinc oxide) in controlled ratios. This modifies the surface properties to simultaneously achieve high charging properties and low developer adhesion, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent uses a composite material structure where the outermost layer contains multiple oxide compounds (SiO2, Al2O3, ZnO) combined in specific proportions. This composite approach allows the layer to exhibit both high charging properties and high lubrication characteristics, preventing both fogging and developer adhesion simultaneously.
2Reliability
If the developing member has high electric resistance to maintain charge, then charge decay is prevented, but developer adhesion to the surface increases
Solution Approach 1:
The patent adjusts the compositional parameters of the outermost layer by controlling the ratios of different oxide compounds. This enables the layer to maintain high electric resistance for charge stability while simultaneously providing high lubrication to reduce developer adhesion, resolving the contradiction between these two properties.
Solution Approach 2:
The composite structure of the outermost layer containing multiple oxide compounds (SiO2, Al2O3, ZnO) in specific proportions provides both high electric resistance and high lubrication characteristics. This composite material approach allows simultaneous achievement of charge maintenance and developer release properties.
3Object-generated harmful factors
If high lubrication is provided to prevent developer adhesion, then developer release is improved, but charging properties may be compromised
Solution Approach 1:
The patent optimizes the compositional parameters of the outermost layer by incorporating specific oxide compounds in controlled ratios. This enables the layer to provide high lubrication for developer release while maintaining sufficient charging properties to prevent reversal developer formation, resolving the contradiction between these two requirements.
Solution Approach 2:
The composite material structure of the outermost layer containing multiple oxide compounds provides both high lubrication characteristics for developer release and adequate charging properties. The synergistic effect of the composite composition resolves the contradiction between developer release and charging capabilities.
4Object-generated harmful factors
If high lubrication is provided to prevent developer adhesion, then developer release is improved, but image quality stability over time deteriorates
Solution Approach 1:
The patent optimizes the compositional parameters of the outermost layer to achieve the right balance between lubrication and image quality stability. By controlling the ratios of oxide compounds, the layer provides sufficient developer release while maintaining stable image quality over long-term use, preventing both adhesion and quality degradation.
Solution Approach 2:
The composite structure of the outermost layer provides a balanced performance where high lubrication prevents developer adhesion while the specific composition maintains image quality stability over time. The composite material ensures both short-term developer release and long-term quality consistency.
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 prevents fogging and maintains high-quality image formation over long-term use by improving charging properties and reducing adhesion, ensuring stable operation of the electrophotographic member.
Implementation Method 1
the developing member should have high charging properties to prevent generation or a reversal developer
Implementation Method 2
have a high electric resistance such that the charge of the charged developer is not decayed until development
Implementation Method 3
high lubrication is also required to prevent adhesion of the developer to the surfaces of these members
Data Source
AI summary
The present invention provides an electrophotographic member which can prevent generation of fogging while high quality images can be output during long-term use. The present invention is an electrophotographic member including a substrate, and an outermost layer directly or indirectly on the substrate, wherein the outermost layer contains a compound having at least a Si—O—Al bond, and the compound has a structural unit represented by Formula (1) and a structural unit represented by AlO3/2.