Photoconductor Coating Variability Control for Smear Prevention
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Solution Overview
Problem
Existing image forming apparatuses with metal-containing compound adhesion units face issues of smear on the charge roller and increased abrasion of blade edges, leading to unstable image formation and reduced durability.
Innovation Solution
A method to precisely control the coating of metal-containing compounds on latent electrostatic image bearing members using a metal-containing compound adhesion unit, where the rate of variability in metallic atoms is maintained between 10% to 70% to prevent smear and abrasion, as measured by XPS, ensuring stable image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal-containing compound coating unit is used to coat metal-containing compound on photoconductor surface, then anti-abrasion and surface energy reduction are improved, but smear occurs on charge roller over time
Solution Approach 1:
The patent introduces a transfer roller as an intermediary component between the coating unit and charge roller. The transfer roller receives the metal-containing compound coating first, then transfers it to the photoconductor surface. This intermediary mechanism prevents direct contact between the coating unit and charge roller, eliminating the smear problem while maintaining the protective coating function.
Solution Approach 2:
The patent divides the coating application process into separate functional stages: the coating unit applies coating to the transfer roller, which then transfers to the photoconductor. This segmentation separates the coating application function from the charging function, preventing contamination of the charge roller while maintaining effective photoconductor protection.
2Manufacturing precision
If metallic soap is used as metal-containing compound with small particle diameter toner, then initial image quality is good, but blade edge abrasion increases considerably over time
Solution Approach 1:
The patent changes the particle size parameter of the metal-containing compound from fine (metallic soap) to coarse (0.1-10 μm range). This parameter change reduces the abrasiveness of the coating material, thereby reducing blade edge wear during cleaning operations while maintaining sufficient coating effectiveness for image quality.
Solution Approach 2:
The patent uses a transfer roller that can be easily replaced or regenerated. Instead of using durable but abrasive metallic soap coatings that wear blades, the system uses a disposable transfer medium that achieves the same protective function without the harmful abrasive effects, sacrificing the transfer roller's longevity for blade durability.
3Volume of moving object
If photoconductor diameter is reduced for downsizing tandem-type full-color image forming apparatus, then apparatus size is reduced, but mechanical durability and anti-abrasion become insufficient
Solution Approach 1:
The patent applies a composite coating system consisting of metal-containing compounds (such as metallic soaps or metal oxides) on the photoconductor surface. This composite structure combines the base photoconductor material with a protective metal-containing layer, enhancing mechanical durability and anti-abrasion properties of the smaller-diameter photoconductor without increasing overall apparatus size.
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 prevents smear on the charge roller and reduces blade edge abrasion, enabling the formation of excellent images in stable conditions by maintaining the optimal concentration of metallic atoms on the surface of the latent electrostatic image bearing member.
Implementation Method 1
a metal-containing compound adhesion unit configured to make a metal-containing compound adhere on the surface of a latent electrostatic image bearing member
Implementation Method 2
a method for reducing the surface energy of a photoconductor by applying a lubricant to the surface of a photoconductor
Data Source
AI summary
An image forming apparatus having a latent electrostatic image bearing member, a metal-containing compound adhesion unit, a latent electrostatic image forming unit, a developing unit, a transferring unit, a fixing unit, and a cleaning unit, in which the rate of variability in the content of metallic atoms in the metal-containing compound adhered on the surface of the latent electrostatic image bearing member, represented by the following equation, is 10% to 70%, Rate of variability=(W2/W1)×100, in which W1 represents the content of metallic atoms in the metal-containing compound according to XPS immediately after the metal-containing compound adhered on the surface of the latent electrostatic image bearing member, and W2 represents the content of metallic atoms in the metal-containing compound adhered on the surface of the latent electrostatic image bearing member according to XPS after 100 sheets of paper are continuously printed using the image forming apparatus.