Electrophotographic Photosensitive Layer Friction Charging
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Solution Overview
Problem
Existing electrophotographic photosensitive members suffer from the generation of white spots in formed images due to insufficient positive charging of minute components on the recording medium, which are not adequately attracted to the photosensitive member during the image formation process.
Innovation Solution
The use of a photosensitive layer containing specific electron transport materials represented by general formulas (1), (2), (3), and (4), along with a polyarylate resin, ensures a charge of calcium carbonate charged by friction is at least +8.0 μC/g, inhibiting the generation of white spots by enhancing the positive charging of minute components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrophotographic photosensitive members are used, then the image formation process can proceed, but white spots are generated in formed images due to insufficient positive charging of minute components
Solution Approach 1:
The patent changes the chemical composition parameters of the photosensitive layer by incorporating specific electron transport materials (compounds of formulas (1)-(4)) and polyarylate resins (formulas (11)-(13)). This compositional parameter change increases the friction charging capability, achieving a charge of at least +8.0 μC/g on calcium carbonate, which prevents white spot formation while maintaining image quality
Solution Approach 2:
The patent creates a composite photosensitive layer material combining multiple components: charge generating materials, electron transport materials (formulas (1)-(4)), and specifically structured polyarylate resins (formulas (11)-(13)). This composite material structure synergistically enhances the positive charging capability to at least +8.0 μC/g, effectively preventing white spot generation while maintaining reliable image formation
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 the formation of white spots in images by ensuring sufficient positive charging of the recording medium components, improving image quality and consistency.
Implementation Method 1
A charge of calcium carbonate charged by friction between the photosensitive layer and the calcium carbonate is at least +8.0 μC/g
Data Source
AI summary
An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, and a binder resin. The electron transport material includes a compound having a halogen atom and represented by a general formula (1), (2), (3), (4), or (5). The binder resin includes a polyarylate resin. The polyarylate resin includes at least one type of repeating unit each represented by general formula (11), at least one type of repeating unit each represented by general formula (12), and a terminal group represented by general formula (13). In general formula (13), Rf represents a chain aliphatic group substituted by at least one fluoro group. A charge of calcium carbonate charged by friction between the photosensitive layer and the calcium carbonate is at least +8.0 μC/g.