Conductive Support Residual Stress for Photoreceptor Wear
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Solution Overview
Problem
Electrophotographic photoreceptors experience image defects due to cracks and wear on the conductive support caused by friction with contact members, leading to changes in distance between the photoreceptor and developing device, resulting in density unevenness and poor gradation.
Innovation Solution
A conductive support with a metallic cylindrical member having a bare area exposed after a photosensitive layer is applied, where the outer circumferential surface of the bare area has a surface residual stress of about −10 MPa or less, manufactured using methods like impact pressing, ironing, and shot peening to enhance strength and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the conductive support is made from a metallic cylindrical member with high strength, then durability is improved, but surface residual stress causes cracks and wear under friction
Solution Approach 1:
The invention changes the physical parameter of surface residual stress by applying shot peening treatment to create compressive stress (−10 MPa or less) on the outer circumferential surface. This parameter change prevents crack initiation and propagation while maintaining the overall strength of the metallic cylindrical member, thereby resolving the contradiction between strength and reliability under frictional conditions.
Solution Approach 2:
The shot peening treatment is applied in advance during manufacturing to pre-establish compressive residual stress on the surface before the conductive support enters service. This preliminary action of creating compressive stress field prevents future crack formation during operation, addressing the reliability issue before it manifests during actual use.
2Duration of action of stationary object
If the conductive support surface is treated to reduce wear, then durability is improved, but manufacturing complexity increases
Solution Approach 1:
The invention applies shot peening, which is a well-established and relatively simple surface treatment process. By changing only the surface stress state through this conventional technique rather than implementing complex coatings or structural modifications, the invention achieves improved durability while minimizing increases in manufacturing complexity.
3Manufacturing precision
If the photosensitive layer is applied completely covering the conductive support, then image quality is improved, but friction with contact members causes cracks
Solution Approach 1:
The invention applies different properties to different parts of the conductive support: the outer circumferential surface receives shot peening treatment to create compressive residual stress for crack prevention, while the top surface maintains its original properties to support the photosensitive layer. This local differentiation allows the support to simultaneously achieve crack resistance and proper image quality.
Solution Approach 2:
The shot peening treatment is applied to the outer circumferential surface before the photosensitive layer is coated. This preliminary strengthening of the surface creates a protective compressive stress field that will prevent cracks during subsequent handling and operation, ensuring both image quality and reliability.
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 conductive support reduces the occurrence of image defects by minimizing cracks and wear, maintaining the distance between the photoreceptor and developing device, thereby improving image quality and durability.
Implementation Method 1
manufactured using methods like impact pressing, ironing, and shot peening to enhance strength and reduce wear
Implementation Method 2
the outer circumferential surface of at least part of the bare area has a surface residual stress of about −10 MPa or less
Data Source
AI summary
A conductive support for an electrophotographic photoreceptor includes a metallic cylindrical member. The conductive support has a bare area exposed even after a photosensitive layer is disposed on the conductive support, and the outer circumferential surface of at least part of the bare area has a surface residual stress of about −10 MPa or less.