Charging Roller Particle Exposure Ratio Microjitter
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Solution Overview
Problem
Conventional charging rollers in image forming apparatuses often experience uneven charging, leading to microjitter issues during printing, which are not adequately addressed by existing solutions.
Innovation Solution
A charging roller design featuring a shaft member, a base layer, and a surface layer with particles, where the particle exposure area ratio is greater than 60%, ensuring uniform discharge and reduced microjitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If particles are contained in the surface layer of the charging roller, then charging uniformity is improved, but microjitter still occurs due to insufficient particle exposure area ratio
Solution Approach 1:
The patent changes the critical parameter of particle exposure area ratio from conventional values to specifically 60% or more. This parameter change ensures sufficient particle exposure on the surface layer, enabling uniform discharge and effective elimination of microjitter while maintaining charging uniformity
Solution Approach 2:
The charging roller employs a composite surface layer structure combining particles with a resin matrix. This composite material design allows the particles to be exposed at an area ratio of 60% or more, creating optimal discharge characteristics that eliminate microjitter while maintaining structural integrity
2Manufacturing precision
If particle size, shape, and amount are controlled in the surface layer, then charging performance is improved, but microjitter cannot be sufficiently eliminated
Solution Approach 1:
The patent identifies and changes the critical parameter from particle characteristics (size, shape, amount) to particle exposure area ratio. By focusing on ensuring 60% or more particle exposure, the patent achieves superior microjitter elimination compared to conventional approaches that only control particle properties
Solution Approach 2:
The patent applies excessive action by ensuring particle exposure area ratio is 60% or more, which exceeds conventional particle inclusion levels. This excessive particle exposure ensures sufficient discharge points to completely eliminate microjitter, going beyond what conventional partial particle inclusion achieves
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 reduces microjitter and improves image quality by ensuring uniform charging of the photoreceptor, maintaining image resolution while minimizing toner contamination.
Implementation Method 1
in minute gaps formed when the charging roller is caused to abut on the photoreceptor, discharge occurs from the charging roller to which a voltage is applied to the photoreceptor
Data Source
AI summary
A charging roller comprises a shaft member, a base layer located outside in the radial direction of the shaft member, and a surface layer located outside in the radial direction of the base layer and forming a surface. The surface layer includes particles, and the ratio of the total area of the particles exposed from the surface of the surface layer in a planar view seen from the radial direction of the charging roller, with respect to the area of the surface of the surface layer is more than 60%.