Electrophotographic Photosensitive Member Chamfer Surface Roughness
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Solution Overview
Problem
The challenge in electrophotographic photosensitive members is to prevent film peeling at the outer circumference of a cylindrical body while avoiding issues like charge leakage, which is exacerbated by surface roughness and adhesiveness limitations, particularly when using amorphous silicon for the photosensitive layer and aluminum for the cylindrical body, leading to suboptimal image quality and speed.
Innovation Solution
The solution involves forming an electrophotographic photosensitive member with a cylindrical body that has chamfers with surface roughness greater than the outer circumference, ensuring the photosensitive layer covers these chamfers, thereby enhancing adhesiveness and preventing peeling, while maintaining smoothness on the outer surface to avoid charge leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the surface roughness of the cylindrical body is increased to enhance adhesiveness of the photosensitive layer, then film peeling is prevented, but charge leakage occurs and image quality deteriorates
Solution Approach 1:
The patent applies different surface roughness characteristics to different regions of the cylindrical body: the outer circumference maintains small surface roughness (Ra ≤ 0.05 μm) to prevent charge leakage and ensure image quality, while the end surfaces have larger surface roughness (Ra > 0.05 μm) to enhance adhesiveness and prevent film peeling. This local differentiation resolves the contradiction by assigning opposite surface quality requirements to different functional zones.
2Object-affected harmful factors
If the surface roughness of the cylindrical body is decreased to prevent charge leakage, then image quality is maintained, but adhesiveness of the photosensitive layer is reduced causing film peeling
Solution Approach 1:
The patent implements local quality differentiation by specifying that the outer circumference of the cylindrical body should have small surface roughness (Ra ≤ 0.05 μm) to prevent charge leakage and maintain image quality, while the end surfaces should have larger surface roughness (Ra > 0.05 μm) to provide enhanced adhesiveness and prevent film peeling under mechanical load.
3Productivity
If amorphous silicon and aluminum are used for photosensitive layer and cylindrical body respectively to meet colorization and speed demands, then image quality and speed are improved, but difference in inner stress increases causing film peeling
Solution Approach 1:
The patent addresses the stress difference issue by applying local quality differentiation to the cylindrical body surface: the end surfaces are designed with larger surface roughness (Ra > 0.05 μm) to enhance mechanical interlocking and adhesiveness, compensating for the stress mismatch between amorphous silicon photosensitive layer and aluminum cylindrical body, while the outer circumference maintains smooth surface (Ra ≤ 0.05 μm) for optimal electrophotographic performance.
Data Source
AI summary
The present invention relates to an electrophotographic photosensitive member including a cylindrical body and a photosensitive layer. The cylindrical body has provided with an outer circumference, end surfaces and chamfers formed therebetween. The photosensitive layer is formed on the outer circumference of the cylindrical body. The photosensitive layer covers the chamfers. The chamfers have a surface roughness larger than the outer circumference. Preferably, the end surfaces have a surface roughness larger than the outer circumference.