Textured Conductive Member for Toner and Paper Dust Release
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Solution Overview
Problem
Existing conductive members for electrophotographic equipment face challenges in minimizing the adhesion of toner and paper dust, particularly due to the difficulty in effectively removing physically embedded dirt and forming uniform surface irregularities.
Innovation Solution
A conductive member with an elastic layer and a surface layer featuring multiple convex units, where the tip of each convex unit is curved, and the height and width of the convex units are within specific ranges, minimizing the contact area with dirt and enhancing dirt removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a modifier is added to the surface layer material to increase water and oil repellency, then superficial dirt can be removed, but physical dirt that is embedded in the surface cannot be sufficiently removed
Solution Approach 1:
The surface layer is segmented into multiple convex units with specific dimensions (1-10 μm height, 1-100 μm width) arranged in an array. This segmentation creates a textured surface that mechanically removes embedded dirt particles through the convex structures, while the base material composition maintains water and oil repellency for superficial dirt removal.
Solution Approach 2:
The surface layer has non-uniform local properties: the convex units provide mechanical action for removing embedded dirt at specific locations, while the valleys between convex units and the base material provide water and oil repellency. This local differentiation allows simultaneous effectiveness against both superficial and physical dirt.
2Reliability
If roughness-forming particles are added to the surface layer material to create surface irregularities, then dirt resistance is improved, but uniform surface irregularities are difficult to form due to particle aggregation
Solution Approach 1:
Roughness-forming particles are embedded in the surface layer material that has self-leveling or self-organizing properties. During curing or processing, the material automatically distributes the particles uniformly, eliminating aggregation issues and creating consistent surface irregularities without requiring complex external control mechanisms.
Solution Approach 2:
The surface layer is formulated as a composite material combining roughness-forming particles with a binder matrix that has specific rheological properties. This composite structure allows the particles to be uniformly distributed and fixed in place, creating stable surface irregularities that provide dirt resistance while maintaining manufacturing precision.
3Reliability
If the convex units have a large contact area with dirt, then adhesion occurs, but if the contact area is reduced, then dirt removal effectiveness decreases
Solution Approach 1:
The convex units are designed with curved surfaces rather than flat surfaces. This curvature reduces the actual contact area between the convex units and dirt particles, minimizing adhesion forces. At the same time, the three-dimensional convex structures provide mechanical leverage for effective dirt removal through rolling or sliding actions during operation.
Solution Approach 2:
The dimensions of the convex units (height: 1-10 μm, width: 1-100 μm) are optimized to achieve the right balance between contact area and mechanical effectiveness. These specific parameter ranges ensure that the convex units are small enough to reduce adhesion but large enough to provide sufficient mechanical action for dirt removal.
Data Source
AI summary
A conductive member for electrophotographic equipment includes an elastic layer and a surface layer formed on the outer peripheral surface of the elastic layer. Multiple convex units are formed on the outer peripheral surface of the surface layer, and a tip of the convex unit is formed of a curved surface. A height of the convex unit is 1.0 nm or more and 10 nm or less, a width of the convex unit is 1.0 nm or more and 100 nm or less, and the size of the width of the convex unit relative to an interval between the convex units is 0.5 or more and 1.5 or less.