Semiconductive Roller Laser Concavities Additive Adhesion
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Solution Overview
Problem
Semiconductive rollers in electrophotographic image forming apparatuses face issues with external additives adhering and accumulating on their surfaces, leading to image defects due to the presence of polishing marks and uneven surface textures, which existing coatings and concavity formations fail to adequately address.
Innovation Solution
A semiconductive roller with a tubular body featuring concavities on its outer peripheral surface, formed through laser processing in a circumferentially and axially overlapping arrangement, which minimizes unprocessed regions and edges, enhancing slipperiness and preventing additive adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer peripheral surface is polished to a predetermined surface roughness, then the surface finish is improved, but polishing marks are created that cause external additives to adhere and accumulate
Solution Approach 1:
The outer peripheral surface is divided into multiple concavities that are circumferentially and axially overlapping, creating a segmented structure that prevents continuous polishing marks while maintaining overall surface uniformity
Solution Approach 2:
The surface is given non-uniform local characteristics through the concavity structure, where each concavity has a specific depth and shape designed to prevent additive accumulation while maintaining appropriate contact with the photoreceptor
2Object-affected harmful factors
If a coating film is applied to improve slipperiness, then additive adhesion is reduced, but the coating process introduces contamination, thickness unevenness, and requires organic solvents
Solution Approach 1:
The harmful coating layer is completely removed and replaced by a structural solution using concavities formed directly in the roller surface, eliminating the need for coating materials and solvents
Solution Approach 2:
The roller surface structure itself provides the anti-adhesion property through its concavity design, without requiring external coating materials or additional protective layers
3Manufacturing precision
If concavities are formed by laser processing, then polishing marks are removed and surface uniformity is improved, but unprocessed regions and edges remain that can still cause additive accumulation
Solution Approach 1:
Multiple concavities are arranged in circumferentially and axially overlapping patterns, merging their effects to eliminate unprocessed regions and create a uniformly treated surface texture
Solution Approach 2:
The concavity pattern extends in both circumferential and axial dimensions with overlapping arrangements, adding dimensional complexity to ensure complete surface coverage and eliminate dead zones
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 effectively suppresses the adhesion and accumulation of external additives, improving image quality by maintaining a uniform surface texture and reducing image defects without the need for coatings, while being environmentally friendly by avoiding organic solvents.
Implementation Method 1
forming a multiplicity of concavities in an outer peripheral surface of the tubular main body by a laser processing method
Data Source
AI summary
A semiconductive roller is provided, which includes a tubular main body having a multiplicity of concavities (2) provided in an outer peripheral surface (1) thereof in at least one of circumferentially overlapping relation and axially overlapping relation. The concavities are each gently concave toward a center thereof from an outer periphery thereof. A semiconductive roller production method is also provided, which includes the step of forming the concavities by a laser processing method.