Conductive Roller with Segmented Elastic Foam for Image Transfer
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Solution Overview
Problem
Conductive rollers with high conductive particle content in their elastic layers face challenges in maintaining image parallelism and charge retention due to increased hardness, which limits their effectiveness in transferring images to recording media.
Innovation Solution
A conductive roller design featuring a cylindrical elastic foam with a conductive particle content of 1% or less, combined with a conductive covering layer, allowing for reduced hardness and improved charge retention while maintaining a volume resistance value of 105Ω or less, thereby enhancing image parallelism and transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive particle content in the elastic layer is increased to improve charge retention, then the volume resistance value decreases, but the hardness of the elastic layer increases which deteriorates image parallelism
Solution Approach 1:
The elastic layer is divided into two functional zones: an inner region with higher conductive particle content for charge retention, and an outer region with lower conductive particle content for maintaining softness and image parallelism. This segmentation allows each zone to optimize its property independently.
Solution Approach 2:
Different regions of the elastic layer have different conductive particle contents tailored to their specific functions. The inner region (closer to the support member) has higher particle content (0.5-2% by mass) for charge retention, while the outer region (closer to the surface) has lower particle content (0.1-1% by mass) for maintaining low hardness and good image parallelism.
2Reliability
If the conductive particle content is increased to achieve lower volume resistance, then charge retention improves, but image transfer quality deteriorates due to increased hardness
Solution Approach 1:
The elastic layer is segmented into inner and outer regions with different conductive particle contents. The outer region's lower particle content (0.1-1% by mass) ensures softness for good image parallelism, while the inner region's higher content (0.5-2% by mass) provides sufficient charge retention.
Solution Approach 2:
The conductive particle content is locally optimized: the outer region has lower concentration for image quality, while the inner region has higher concentration for charge retention. This local differentiation resolves the contradiction between charge retention and image parallelism.
3Stability of the object's composition
If the elastic layer hardness is increased to improve structural stability, then charge retention improves, but image transfer precision deteriorates
Solution Approach 1:
The elastic layer exhibits local quality differentiation where the outer region maintains low hardness for image parallelism while the inner region provides structural stability. The outer region's lower particle content (0.1-1% by mass) ensures softness for precise image transfer, while the inner region's higher content provides structural support.
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 roller effectively increases image parallelism and achieves better charge retention, allowing for improved image transfer quality by reducing the hardness of the elastic layer and maintaining a low volume resistance value.
Implementation Method 1
the elastic layer includes a cylindrical elastic foam and a conductive covering layer covering an exposed surface of the elastic foam and has a volume resistance value of 105Ω or less at an applied voltage of 10 V
Data Source
AI summary
A conductive roller includes a support member, an elastic layer disposed on an outer peripheral surface of the support member, and a surface layer disposed on an outer peripheral surface of the elastic layer. The elastic layer includes a cylindrical elastic foam and a conductive covering layer covering an exposed surface of the elastic foam and has a volume resistance value of 105Ω or less at an applied voltage of 10 V. The elastic foam has a conductive particle content of 1% by mass or less based on the total mass of the elastic foam.