Electroconductive Layer Core-Shell Titanium Oxide
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Solution Overview
Problem
Conventional electrophotographic photosensitive members using black titanium oxide for electroconductive layers achieve low initial sensitivity due to reduced luminosity, which affects the reflection of image exposure light and leads to fluctuations in light portion potential during repeated use.
Innovation Solution
An electrophotographic photosensitive member with a support, an electroconductive layer containing a core material with low oxygen deficiency titanium oxide and a covering layer with high oxygen deficiency titanium oxide, where the oxygen deficiency ratio of the covering layer is more than 10 times that of the core material, ensuring high luminosity and electroconductive performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black titanium oxide is used in the electroconductive layer to achieve high electroconductive performance, then electroconductive performance is improved, but initial sensitivity deteriorates due to reduced luminosity
Solution Approach 1:
The invention applies local quality by creating a core-shell structure where the core material (first metal oxide particle) provides electroconductive performance while the shell material (second metal oxide particle) provides high luminosity. This allows different regions of the same particle to have different functions: the core maintains electroconductivity while the shell restores optical hiding power and luminosity, thereby resolving the contradiction between electroconductive performance and initial sensitivity.
2Reliability
If black titanium oxide is used to enhance electroconductive performance, then electroconductive performance is improved, but light portion potential fluctuation increases during repeated use
Solution Approach 1:
The invention uses composite materials by combining two different metal oxide particles into a core-shell structure. The core material provides electroconductive performance while the shell material with high optical hiding power stabilizes the electroconductive layer's properties during repeated use. This composite structure prevents excessive electroconductive performance that would otherwise cause light portion potential fluctuation, while still maintaining adequate electroconductivity through the core material.
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 achieves high initial sensitivity and reduces fluctuations in light portion potential during repeated use by maintaining high luminosity and electroconductive performance, effectively addressing the limitations of conventional technologies.
Implementation Method 1
an electrophotographic photosensitive member including a support, an electroconductive layer and a photosensitive layer in this order
Implementation Method 2
the electroconductive layer contains a binder material and a metal oxide particle; the metal oxide particle has a core material containing a titanium oxide, and a covering layer which covers the core material and contains the titanium oxide
Data Source
AI summary
There is provided an electrophotographic photosensitive member that can achieve both of an adequately high initial sensitivity as the electrophotographic photosensitive member and reduction in the fluctuation of a light portion potential at the time of repeated use. An electrophotographic photosensitive member includes a support, an electroconductive layer and a photosensitive layer in this order, wherein the electroconductive layer contains a binder material and a metal oxide particle; the metal oxide particle has a core material containing a titanium oxide, and a covering layer which covers the core material and contains the titanium oxide; and when the oxygen deficiency ratio of the metal oxide particle is represented by A, the oxygen deficiency ratio of the core material is represented by B, and the oxygen deficiency ratio of the covering layer is represented by C, the Expressions (1) and (2) are satisfied: A≤2% (1) and 10×B<C (2).