Electrophotographic Photoreceptor Intermediate Layer Design
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Solution Overview
Problem
Electrophotographic photoreceptors face issues with image defects such as black spots and toner adhesion due to surface irregularities on aluminum supports, leading to poor image quality and increased residual potential, especially under high humidity and repeated use conditions.
Innovation Solution
A photoreceptor design featuring an intermediate layer with inorganic particles of specific size and a polyarylate resin outer layer, where the intermediate layer is fully covered by the photosensitive layer to prevent exposure and ensure strong adhesion, thereby preventing toner adhesion and fog formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an intermediate layer containing polyamide resin or vinyl acetate is provided to cover defects on the aluminum support, then image defects such as black spots are reduced, but residual potential increases and charging/charge retention properties deteriorate due to fatigue and degradation during repeated image formation
Solution Approach 1:
The patent changes the material composition parameters of the intermediate layer by incorporating specific inorganic particles (such as silicon oxide, aluminum oxide, or titanium oxide with particle diameters of 0.1-10 μm) into the polyamide resin or vinyl acetate matrix. This compositional modification allows the layer to maintain defect-covering capabilities while improving electrical properties and resistance to fatigue degradation during repeated use
Solution Approach 2:
The patent creates a composite intermediate layer by combining organic binder materials (polyamide resin or vinyl acetate) with inorganic particles (silicon oxide, aluminum oxide, or titanium oxide). This composite structure provides both the defect-covering function of the organic matrix and the electrical stability of the inorganic particles, resolving the contradiction between image quality and charge retention
2Reliability
If a hydrated aluminum oxide layer is provided on the aluminum support to improve electrophotographic performance, then sensitivity and charging properties are enhanced, but image defects such as black spots and fog occur under heavy-duty conditions (high humidity or repeated use) when reversal development is employed
Solution Approach 1:
The patent introduces an intermediate layer containing polyamide resin or vinyl acetate (optionally with inorganic particles) as a mediator between the hydrated aluminum oxide layer on the support and the photosensitive layer. This intermediate layer acts as a buffer that prevents direct interaction between the hydrated oxide and the photosensitive materials under heavy-duty conditions, thereby preventing fog and black spot formation while preserving the electrophotographic benefits of the hydrated oxide layer
3Object-affected harmful factors
If the amount of Fe and Si alloy components in the aluminum support is limited to reduce crystallizing materials, then image defects from crystallizing materials are reduced, but mechanical strength of the support may be compromised
Solution Approach 1:
The patent modifies the alloy composition parameters of the aluminum support by precisely controlling the Fe content at 0.03-0.2 wt% and Si content at 0.03-0.1 wt%, which are optimized ranges that balance mechanical strength requirements with the minimization of crystallizing material formation that causes image defects
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
This configuration results in high-quality toner images with improved sharpness and density, reduced black spots, and enhanced cleaning capabilities, even after extensive printing.
Implementation Method 1
an intermediate layer containing inorganic particles having a number average primary particle diameter of 5 to 300 nm is provided between an electrically conductive support containing aluminum and a photosensitive layer
Implementation Method 2
an intermediate layer containing inorganic particles having a number average primary particle diameter of 5 to 300 nm is provided between an electrically conductive support containing aluminum and a photosensitive layer
Implementation Method 3
Electrophotographic performance of the above photoreceptor is largely influenced by the surface condition of an aluminum support
Implementation Method 4
electrophotographic image forming method
Data Source
AI summary
Provided are a photoreceptor, an image forming method, an image forming apparatus and a processing cartridge exhibiting an excellent effect on high quality toner images with no image defect caused by occurrence of fog, lowered image density and sharpness, or generation of black spots. Disclosed also is an electrophotographic photoreceptor including an electrically conductive support containing aluminum, an uppermost layer, and at least an intermediate layer containing inorganic particles and binder, the intermediate layer being provided between the support and the uppermost layer,wherein the support has on a surface of the support crystallizing material particles having a diameter of 0.3-10 μm in an amount of being 0.5-20 per (20 μm)2, the inorganic particles have a number average primary particle diameter of 5-300 nm, the intermediate layer is an insulating layer and covered by the uppermost layer.