Electrophotographic Photosensitive Member Undercoat Layer
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Solution Overview
Problem
Existing electrophotographic photosensitive members face issues with interference fringes, black spots, and potential variations due to aggregation of titanium oxide particles in high-temperature high-humidity environments, which are not adequately addressed by existing dispersion methods.
Innovation Solution
Incorporating zinc oxide and titanium oxide particles with surface treatments using organometallic or organosilicon compounds into the undercoat layer, with specific particle size and volume ratios, and ensuring uniform dispersion by controlling the average primary particle diameter and secondary particle formation to improve masking properties and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If titanium oxide particles are added to the undercoat layer to suppress interference fringes, then interference fringe suppression is improved, but particle aggregation occurs causing black spots and potential variations
Solution Approach 1:
A silane coupling agent is used as an intermediary substance to treat the surface of titanium oxide particles. This coupling agent prevents particle aggregation by modifying the particle surface properties, enabling uniform dispersion in the undercoat layer while maintaining the interference fringe suppression effect and preventing black spots and potential variations
Solution Approach 2:
The patent specifies precise control of titanium oxide particle size (0.1-6.0 μm average diameter) and composition ratios (specific weight ratios relative to zinc oxide and tin oxide particles). These parameter optimizations ensure uniform dispersion and effective interference fringe suppression without causing aggregation-related defects
2Object-affected harmful factors
If multiple metal oxide particles are dispersed in the undercoat layer to improve masking properties, then masking ability is improved, but uniform dispersion becomes difficult to achieve
Solution Approach 1:
The silane coupling agent serves as a mediator that facilitates uniform dispersion of multiple metal oxide particles (titanium oxide, zinc oxide, tin oxide) in the undercoat layer. By treating particle surfaces, it prevents aggregation and ensures homogeneous distribution, achieving both improved masking ability and uniform composition
Solution Approach 2:
The patent creates a composite undercoat layer containing multiple metal oxide particles (titanium oxide, zinc oxide, tin oxide) in specific weight ratios. This composite structure combines the beneficial properties of each oxide while maintaining uniform dispersion through surface treatment, achieving superior masking properties without aggregation
3Object-affected harmful factors
If the undercoat layer contains metal oxide particles to suppress interference fringes, then optical performance is improved, but conductivity and potential stability deteriorate
Solution Approach 1:
The silane coupling agent acts as an intermediary that prevents metal oxide particle aggregation, ensuring uniform distribution in the undercoat layer. This uniform dispersion maintains both the optical performance for interference fringe suppression and the electrical conductivity properties, preventing potential variations
Solution Approach 2:
The patent optimizes the size parameters of metal oxide particles (0.1-6.0 μm average diameter for titanium oxide, specific size ranges for zinc oxide and tin oxide) and their composition ratios. These controlled parameters ensure that particles effectively suppress interference fringes while maintaining uniform dispersion and stable electrical conductivity
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 suppresses interference fringes, black spots, and potential variations, maintaining performance in high-temperature high-humidity environments by ensuring uniform dispersion and masking defects, while optimizing the volume ratio and particle size of titanium oxide particles.
Implementation Method 1
The undercoat layer contains zinc oxide particles subjected to a surface treatment with an organometallic compound or an organosilicon compound and titanium oxide particles subjected to a surface treatment with an organometallic compound or an organosilicon compound
Implementation Method 2
The titanium oxide particles have an average primary particle diameter of 100 nm or more and 600 nm or less
Data Source
AI summary
An undercoat layer of an electrophotographic photosensitive member contains zinc oxide particles subjected to a surface treatment with an organometallic compound or an organosilicon compound and titanium oxide particles subjected to a surface treatment with an organometallic compound or an organosilicon compound. The titanium oxide particles have an average primary particle diameter of 100 nm or more and 600 nm or less. A volume ratio of the titanium oxide particles represented by formula (1) is 1.0 or more and 25 or less.