Photoreceptor Protective Layer Urethane Acrylate Durability
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Solution Overview
Problem
Electrophotographic image forming apparatuses face challenges in durability and image quality due to the influence of external electrical and mechanical forces, ozone, and charging products, which affect the photosensitive body's performance and longevity.
Innovation Solution
A photosensitive body with a protective layer comprising a urethane oligomer acrylate and modified perfluoropolyether acrylate, along with conductive particles, is used to enhance durability and image quality by improving mechanical properties and resistance to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional photosensitive body structure is used, then the device complexity is low, but the durability and scratch resistance are insufficient due to external electrical and mechanical forces, ozone, and charging products
Solution Approach 1:
The photosensitive body is divided into multiple functional layers: a support layer, a photosensitive layer containing charge generating and charge transporting materials, and an outer protective layer. This segmentation allows each layer to specialize in specific functions, with the protective layer specifically designed to resist external forces, ozone, and charging products while the internal layers handle photoelectric functions.
Solution Approach 2:
The patent employs composite material structures throughout: the photosensitive layer combines charge generating materials and charge transporting materials; the protective layer uses composite polymer compositions; and the overall photosensitive body integrates multiple material systems with complementary properties to achieve both durability and photoelectric performance.
2Productivity
If the photosensitive body is exposed to repeated use with electrical and mechanical forces, then productivity is maintained, but the duration of action decreases due to deterioration from ozone and charging products
Solution Approach 1:
The protective layer is applied in advance to shield the photosensitive layer from harmful effects of repeated use, including electrical forces, mechanical forces, ozone, and charging products. This pre-protective measure allows the photosensitive body to maintain high productivity over extended periods by preventing cumulative damage from operational stresses.
3Ease of manufacture
If a simple protective coating is applied, then ease of manufacture is high, but the scratch resistance and resistance to environmental factors are insufficient
Solution Approach 1:
The protective layer's composition parameters are specifically optimized to achieve desired performance characteristics. The polymer composition includes specific ratios of components, controlled molecular weights, and selected functional groups that provide enhanced scratch resistance and moisture resistance while maintaining manufacturability through conventional coating processes.
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 significantly enhances the durability and image quality by reducing the influence of moisture, improving scratch resistance, and maintaining high-quality image output over a long period, even with repeated use.
Implementation Method 1
the protective layer has a dense crosslinked structure
Data Source
Figure 1
Figure 2~3
AI summary
A photosensitive body is provided. The photosensitive body includes a photosensitive layer, and a protective layer formed on the photosensitive layer, and the protective layer includes a urethane oligomer acrylate and a modified perfluoropolyether acrylate.