Developer Roller Resistance for Toner Stress Reduction
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Solution Overview
Problem
In non-magnetic one-component development type image forming apparatuses, high physical stress on toner leads to rapid deterioration and short toner life, especially when low melt viscosity toner is used for energy-saving lower temperature fixing conditions.
Innovation Solution
The image forming apparatus includes a developing device with a developer carrying member having a specific resistance value (9 to 11 [Log Ω]) and a regulation blade that controls the toner layer thickness, ensuring appropriate toner conveyance and adhesion to the image carrying member, while maintaining optimal peripheral speed ratios to reduce physical stress on the toner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low melt viscosity toner is used for lower temperature fixing conditions, then energy consumption is reduced, but physical stress on toner increases and toner life shortens
Solution Approach 1:
The invention changes the resistance value parameter of the developer carrying member to a specific range (9 to 11 Log Ω) to reduce physical stress on toner particles during conveyance, thereby extending toner life while maintaining low-temperature fixing capability with low melt viscosity toner
Solution Approach 2:
The invention applies beforehand cushioning by controlling the resistance value of the developer carrying member to minimize physical stress on toner before deterioration occurs, preventing toner particle damage during the conveyance process in the developing device
2Manufacturing precision
If regulation blade is used to regulate toner layer thickness, then toner layer uniformity is improved, but physical stress on toner increases
Solution Approach 1:
The invention changes the resistance value parameter of the developer carrying member to reduce physical stress on toner during regulation, allowing the regulation blade to maintain toner layer uniformity while minimizing toner particle damage
Solution Approach 2:
The developer carrying member acts as an intermediary between the regulation blade and toner particles, with its controlled resistance value reducing the transmission of physical stress from the regulation blade to the toner while still allowing effective toner layer regulation
3Manufacturing precision
If development voltage is applied to transfer toner to image carrying member, then image density is achieved, but physical stress on toner increases
Solution Approach 1:
The invention changes the resistance value parameter of the developer carrying member to optimize the development process, enabling effective toner transfer to the image carrying member while reducing physical stress and minimizing toner particle deterioration
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 image density, enhances toner durability, and improves image quality by reducing physical stress on the toner, thus extending toner life and maintaining image stability under varying conditions.
Implementation Method 1
The charging device charges the image carrying member to a prescribed surface potential
Implementation Method 2
The exposure device exposes the surface of the image carrying member charged by the charging device so as to form an electrostatic latent image with attenuated electrostatic charge
Implementation Method 3
When the toner passes below the regulation blade, the toner is charged by friction with the surfaces of the regulation blade and the developing roller
Implementation Method 4
a photosensitive member and the developing roller are rotated in contact with each other, and thus the toner on the surface of the developing roller is developed by an electric field on the photosensitive member
Data Source
AI summary
An image forming apparatus includes an image carrying member, a charging device, an exposure device, a developing device, a development voltage power supply, and a control section. The developing device includes a development container which contains a non-magnetic one-component developer and a developer carrying member which includes a rotary shaft and a roller portion stacked on the outer circumferential surface of the rotary shaft, and the resistance value of the roller portion is 9 to 11 [Log Ω], and when the amount of toner conveyed on the developer carrying member is Md [g/m2], the amount of toner adhered on the image carrying member in a solid image is Mp [g/m2], the peripheral speed of the developer carrying member and the image carrying member are Sd [mm/sec] and Sp [mm/sec], 0.8×Sd/Sp<Mp/Md and 0.8≤Sd/Sp≤1.2 are satisfied.