Electrophotographic Photoreceptor Intermediate Layer Metal Oxide Microparticles
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Solution Overview
Problem
Electrophotographic photoreceptors with surface protective layers containing p-type semiconductor microparticles face issues with transfer memory and fogging due to low surface electrical resistance, which are exacerbated by increased microparticle content for improved wear resistance.
Innovation Solution
An electrophotographic photoreceptor configuration featuring an intermediate layer with metal oxide microparticles and a surface protective layer containing p-type semiconductor microparticles, where the microparticles are surface-treated with organic compounds to enhance electron transportability and prevent fogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of p-type semiconductor microparticles is increased to improve wear resistance and memory resistance, then wear resistance and memory resistance are improved, but fogging occurs due to low surface electrical resistance
Solution Approach 1:
The patent introduces an intermediate layer containing metal oxide microparticles (such as tin oxide or titanium oxide) between the electroconductive support and the photosensitive layer. This intermediate layer acts as a mediator that prevents fogging while allowing the surface protective layer to contain p-type semiconductor microparticles for improved wear and memory resistance. The intermediate layer with its specific electron transport properties resolves the contradiction by blocking the harmful effect (fogging) without compromising the beneficial effect (memory resistance).
Solution Approach 2:
The patent employs a composite structure with multiple layers, each containing different microparticle compositions. The surface protective layer contains p-type semiconductor microparticles (such as CuAlO2 or SrCu2O2) for wear resistance and memory resistance, while the intermediate layer contains metal oxide microparticles for preventing fogging. This composite material approach allows simultaneous achievement of multiple properties that would be conflicting in a single-material system.
2Strength
If the content of p-type semiconductor microparticles is increased to improve wear resistance, then wear resistance is improved, but surface electrical resistance decreases causing fogging
Solution Approach 1:
The patent divides the photoreceptor structure into distinct functional layers: an intermediate layer containing metal oxide microparticles for fogging prevention, and a surface protective layer containing p-type semiconductor microparticles for wear resistance. This segmentation allows each layer to independently perform its specific function without interfering with the other, resolving the contradiction between wear resistance and fogging prevention.
Solution Approach 2:
The intermediate layer serves as a mediator that prevents the low surface electrical resistance effect of p-type semiconductor microparticles from causing fogging. By positioning this layer between the electroconductive support and the photosensitive layer, it blocks the harmful electrical conduction pathway while allowing the surface protective layer to maintain high wear resistance through p-type semiconductor microparticles.
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 proposed configuration achieves high memory resistance and prevents fogging over extended use, maintaining image quality by ensuring rapid electron discharge and effective charge transport.
Implementation Method 1
the at least one metal oxide microparticle is selected from the group consisting of untreated tin oxide particles, tin oxide particles surface-treated with organic compounds, untreated anatase titanium oxide particles, anatase titanium oxide particles surface-treated with organic compounds, untreated rutile titanium oxide particles, and rutile titanium oxide particles surface-treated with organic compounds
Implementation Method 2
a surface protective layer, deposited on the photosensitive layer, includes a resin and a p-type semiconductor microparticle contained in the resin
Implementation Method 3
the microparticles are surface-treated with organic compounds to enhance electron transportability and prevent fogging
Data Source
AI summary
An electrophotographic photoreceptor includes an intermediate layer, a photosensitive layer, and a surface protective layer, deposited in this order on an electroconductive support. The surface protective layer includes a resin and a p-type semiconductor microparticle contained in the resin. The intermediate layer includes a resin and at least one metal oxide microparticle contained in the resin. The at least one metal oxide microparticle is selected from the group consisting of untreated tin oxide particles, tin oxide particles surface-treated with organic compounds, untreated anatase titanium oxide particles, anatase titanium oxide particles surface-treated with organic compounds, untreated rutile titanium oxide particles, and rutile titanium oxide particles surface-treated with organic compounds.