Regulating Blade Surface Roughness for Toner Melt Adhesion
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Solution Overview
Problem
Existing developing apparatuses using dry mono-component developing methods face challenges in forming a uniform thin layer of developer on the developing sleeve, leading to melt adhesion and image streaks due to inadequate surface roughness regulation.
Innovation Solution
A developing apparatus with a regulating blade that has a specific surface roughness profile, characterized by a maximum height roughness Rz between 3 and 20 μm, an average interval of unevenness Sm between 30 and 100 μm, and a volume Vmp of the protruding peak part greater than or equal to 0.05 ml/m², which effectively suppresses melt adhesion and stabilizes image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the surface roughness Rz is regulated to form a uniform thin layer of developer, then the developer layer uniformity is improved, but the melt adhesion suppression is insufficient leading to image streaks
Solution Approach 1:
The patent applies parameter changes by introducing three-dimensional surface roughness parameters (Rz, Sm, Vmp) to characterize and control the regulating blade surface properties. By optimizing these parameters within specific ranges, the patent achieves both uniform developer layer formation and suppression of melt adhesion, resolving the technical contradiction between layer uniformity and adhesion prevention.
Solution Approach 2:
The patent transitions from traditional two-dimensional surface roughness measurement to three-dimensional surface roughness characterization. By adding the Sm (average interval of unevenness) and Vmp (volume of protruding peak part) parameters, the patent creates a more comprehensive surface profile control system that effectively addresses both developer layer uniformity and melt adhesion suppression.
2Manufacturing precision
If the developer layer thickness is reduced for higher image quality, then the image resolution is improved, but the melt adhesion occurs more frequently
Solution Approach 1:
The patent uses parameter changes by optimizing the regulating blade surface roughness parameters (Rz: 1-20 μm, Sm: 30-100 μm, Vmp: ≥0.05 ml/m²) to enable formation of thinner developer layers without causing melt adhesion. The specific Vmp parameter ensures sufficient peak volume to prevent toner accumulation and melting while maintaining thin layer uniformity for high image quality.
3Ease of manufacture
If the regulating blade surface is made smoother for easier manufacturing, then the manufacturing cost is reduced, but the developer layer uniformity deteriorates
Solution Approach 1:
The patent specifies concrete parameter ranges (Rz: 1-20 μm, Sm: 30-100 μm, Vmp: ≥0.05 ml/m²) that balance manufacturing feasibility with performance requirements. These parameters provide clear manufacturing targets while achieving the desired developer layer uniformity, resolving the contradiction between ease of manufacture and layer precision.
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 proposed solution enables the formation of a uniform developer layer on the developing sleeve, reducing melt adhesion and image streaks, thereby stabilizing image quality and extending the period of contamination suppression on the developing sleeve.
Implementation Method 1
a regulating member configured to come in contact with the developer bearing member, and regulate a thickness of a layer of the developer borne on the developer bearing member, wherein 3≤Rz<20 (μm), 30≤Sm≤100 (μm), and Vmp≥0.05 ml/m2 are satisfied
Data Source
AI summary
A developing apparatus includes a developer bearing member; and a regulating member configured to come in contact with the developer bearing member, and regulate the thickness of the layer of the developer. The contact surface of the regulating member with the developer bearing member satisfies 3≤Rz<20 (μm), 30≤Sm≤100 (μm), and Vmp≥0.05 ml/m2 where Rz represents a maximum height roughness, and Sm represents an average interval of unevenness, and Vmp represents a volume in an initial state of a protruding peak part in parameters in a three-dimensional surface roughness defined in ISO 25178.