Electrophotographic Photosensitive Member Conductive Layer Doping
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Solution Overview
Problem
Conventional electrophotographic photosensitive members experience pattern memory and increased residual potential due to conductive layer cracking when metal oxide particle content is increased to enhance chargeability, leading to defects in image output.
Innovation Solution
An electrophotographic photosensitive member with a conductive layer containing titanium oxide particles coated with tin oxide doped with phosphorus, tungsten, fluorine, niobium, or tantalum, and their respective undoped counterparts, where the volume ratios of these particles are optimized to maintain electro-conductivity while preventing cracking and pattern memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of metal oxide particles in the conductive layer is increased to enhance chargeability, then the charge injection blocking property is improved, but the conductive layer cracks and pattern memory occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the metal oxide particles by doping tin oxide with specific elements ( phosphorus, tungsten, fluorine, niobium, or tantalum). This doping modifies the electro-conductivity and chargeability properties of the particles, allowing enhanced charge injection blocking property without requiring increased particle content that would cause cracking
Solution Approach 2:
The patent uses composite metal oxide particles consisting of tin oxide as the base material doped with other elements. This composite structure combines the high electro-conductivity of tin oxide with the beneficial properties of dopant elements, achieving improved chargeability while maintaining conductive layer integrity through optimized material composition rather than increased particle concentration
2Reliability
If the content of metal oxide particles is increased to suppress residual potential, then the chargeability is improved, but pattern memory occurs in the output image
Solution Approach 1:
The patent modifies the electrical parameters of the metal oxide particles through doping, changing their charge characteristics and residual potential properties. The doped tin oxide particles achieve better chargeability and residual potential suppression without the need for increased particle content, thereby preventing pattern memory 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 optimized volume ratios of metal oxide particles in the conductive layer suppress pattern memory and residual potential increases, ensuring stable image output without conductive layer cracking.
Implementation Method 1
a tin oxide particle doped with phosphorus, a tin oxide particle doped with tungsten, a tin oxide particle doped with fluorine, a tin oxide particle doped with niobium, or a tin oxide particle doped with tantalum
Data Source
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AI summary
Provided are an electrophotographic photosensitive member in which a residual potential hardly increases at the time of image formation, a pattern memory hardly occurs, and the crack of an electro-conductive layer hardly occurs, and a process cartridge and an electrophotographic apparatus each including the electrophotographic photosensitive member. To this end, the electro-conductive layer of the electrophotographic photosensitive member contains titanium oxide particles coated with tin oxide doped with phosphorus, tin oxide particles doped with phosphorus, and a binding material, and when a total volume of the electro-conductive layer is represented by VT, a volume of the titanium oxide particles coated with tin oxide doped with phosphorus in the electro-conductive layer is represented by V1P, and a volume of the tin oxide particles doped with phosphorus in the electro-conductive layer is represented by V2P, the VT, the V1P, and the V2P satisfy the following expressions: 2≤{(V2P/VT)/(V1P/VT)}x100≤25 and 15≤{(V1P/VT)+(V2P/VT)}x100≤45.