Photoconductor Intermediate Layer Surface Profile Control
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Solution Overview
Problem
Conventional electrophotographic photoconductors fail to produce high-quality images without background fouling and durability issues, despite various attempts to modify the intermediate layer and surface profile.
Innovation Solution
A photoconductor with an electroconductive substrate, an intermediate layer comprising a metal oxide and a binder resin, where the intermediate layer's surface profile is analyzed using multi-resolution analysis to achieve specific arithmetic mean roughness values, preventing charge leakage and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an intermediate layer is formed on the electroconductive substrate to prevent charge leakage, then background fouling is reduced, but the photoconductor durability and image quality deteriorate over time
Solution Approach 1:
The patent changes the surface profile parameters of the intermediate layer by controlling the arithmetic mean roughness (Ra) to be 0.01 μm or less through specific surface treatment processes. This parameter change optimizes both the charge leakage prevention capability and the durability, allowing the photoconductor to maintain high image quality and resist background fouling over extended periods of continuous operation
Solution Approach 2:
The patent employs a composite intermediate layer structure combining organic resin materials with inorganic particles (such as silicon oxide, titanium oxide, or zirconium oxide). This composite material approach enhances the layer's electrical properties for charge leakage prevention while simultaneously improving mechanical durability and resistance to degradation during continuous operation
2Object-generated harmful factors
If the intermediate layer surface profile is modified to improve charge leakage prevention, then background fouling decreases, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies the intermediate layer structure by focusing on controlling a single critical parameter - the arithmetic mean roughness (Ra) of 0.01 μm or less - rather than implementing complex multi-layer structures. This parameter-based approach achieves effective charge leakage prevention while maintaining manufacturing simplicity and avoiding excessive structural 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 prevents background fouling and improves the durability of the photoconductor, enabling the production of high-quality images for extended periods without abnormal images like black spots, with a mileage of at least 5 times longer than conventional methods.
Implementation Method 1
an intermediate layer, and a photosensitive layer, overlying the substrate in this order, wherein the intermediate layer includes a metal oxide and a binder resin, and has a WRa (LLH) of less than 0.12 μm and a WRa (LHH) of from 0.03 to 0.2 μm
Implementation Method 2
a photosensitive layer, overlying the substrate in this order
Data Source
AI summary
A photoconductor, including an electroconductive substrate; an intermediate layer overlying the electroconductive substrate; and a photosensitive layer overlying the intermediate layer. The intermediate layer includes a metal oxide and a binder resin, and has a WRa (LLH) less than 0.12 μm and WRa (LHH) of from 0.03 to 0.2 μm in a curve.