Developing Device Curved Inner Face for Uniform Developer Density
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Solution Overview
Problem
Developing devices using two-component developers face issues with uneven developer density, leading to image density variations, particularly in high image area ratios, due to uneven developer distribution and magnetic force patterns, which can result in suboptimal image quality.
Innovation Solution
The developing device incorporates a magnetic field generator with a developer scooping pole and regulation pole, a developer conveyor, and a rod-shaped developer regulator positioned on the side wall of the casing, where the curved inner face aligns with the developer bearer's rotation, ensuring the developer is scooped and regulated uniformly, maintaining a consistent layer thickness and preventing developer return to the supply compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional developer containing compartment and conveying screw are used, then the developer can be transported, but uneven developer density occurs leading to image density variations
Solution Approach 1:
The curved inner face of the side wall is designed to align with the orbit of rotation of the developer conveyor, creating a curved surface that guides developer flow uniformly. This curvature ensures consistent developer distribution by preventing dead zones and ensuring smooth flow along the rotational path of the conveyor.
Solution Approach 2:
The magnetic field generator employs multiple poles (scooping pole and regulation pole) with different local functions: the scooping pole attracts developer onto the bearer, while the regulation pole controls the layer thickness. This localized functional differentiation ensures uniform developer density by addressing specific regional needs within the developer containing compartment.
2Volume of moving object
If the developer retention area is reduced to enhance compactness, then the device size decreases, but developer distribution uniformity may deteriorate
Solution Approach 1:
The developer regulator extends in the axial direction of the developer bearer, utilizing the third dimension (axis direction) to control developer layer thickness. This dimensional approach allows precise regulation of developer distribution without increasing the radial or longitudinal footprint, maintaining compactness while ensuring uniformity.
Solution Approach 2:
The curved inner face of the side wall follows the rotational orbit of the developer conveyor, creating an optimized space utilization that maximizes developer distribution efficiency within a compact volume. This curved geometry ensures uniform developer flow patterns even in a reduced retention area.
3Manufacturing precision
If the developer regulator is positioned on the side wall with curved inner face, then developer layer thickness is regulated uniformly, but device complexity increases
Solution Approach 1:
The side wall with the curved inner face serves multiple functions: it contains the developer, guides the developer flow along the conveyor orbit, and supports the developer regulator. This multi-functional design achieves precise layer thickness control without adding separate complex structural components.
Solution Approach 2:
The developer regulator is integrated with the side wall structure, combining the regulatory function with the containing structure. This merging eliminates the need for separate regulatory components and simplifies the overall device complexity while maintaining precise layer thickness control.
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
This configuration stabilizes developer density, reduces image density fluctuations, and maintains fluidity, resulting in consistent and high-quality toner images over time, even with reduced developer retention areas, enhancing the compactness and efficiency of the developing device.
Implementation Method 1
a magnetic field generator disposed inside the developer bearer and having a developer scooping pole to attract the developer and a regulation pole to cause the developer to stand on end on the developer bearer
Data Source
AI summary
A developing device includes a developer bearer, a magnetic field generator, a casing having an opening, a developer conveyor to rotate inside a developer containing compartment below the developer bearer, and a developer regulator. A side wall of the casing defines a bottom end of the opening, and the developer regulator is disposed on the side wall. The side wall includes an upper end face facing the developer bearer below an axis of the developer bearer and a curved inner face along an orbit of rotation of the developer conveyor, extending from below the developer conveyor toward the upper end face. On a virtual plane perpendicular to the axis of the developer bearer, an intersection between a tangent line to an upper end of the curved inner face and the surface of the developer bearer is in a range from a tangential magnetic-flux peak and a closest approach point.