Developing Roller Conductivity Regions for Low-Torque Toner Supply
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing developing rollers face challenges in maintaining image concentration and durability when reducing drive torque and increasing process speed, as they struggle to attract sufficient toner due to reduced contact area and peripheral speed difference, leading to potential degradation in image quality.
Innovation Solution
A developing roller with a surface comprising a substrate and a conductive layer, featuring adjacent first and second regions with varying conductivity, where the first region includes polycarbonate structures represented by Formula (1A), enhancing durability and dielectric properties to maintain image concentration under reduced drive torque and increased process speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the contact area of the toner supply roller is reduced or the peripheral speed difference is reduced to reduce drive torque, then energy saving is achieved, but the amount of toner supplied becomes insufficient
Solution Approach 1:
The developing roller surface is divided into insulating portions and conductive portions with different electrical properties. The insulating portions attract toner through electrostatic forces, while conductive portions facilitate toner release. This local differentiation allows sufficient toner supply even with reduced contact area and speed difference, resolving the contradiction between energy saving and toner supply quantity.
Solution Approach 2:
The invention changes the electrical parameters of the developing roller surface by creating regions with different conductivity. This parameter change enables the roller to attract and supply sufficient toner under reduced drive torque conditions, as the electrostatic attraction mechanism compensates for the reduced mechanical contact and speed difference.
2Reliability
If conventional insulating materials are used in the developing roller, then initial image formation is adequate, but image concentration degrades over time due to wear and durability issues
Solution Approach 1:
The developing roller uses a composite structure combining insulating materials (such as polyester or polyurethane) with conductive materials (such as carbon black or metal particles). This composite construction provides both the electrostatic properties needed for image concentration and the durability required for long-term reliability, as the conductive components enhance wear resistance while maintaining electrical functionality.
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 developing roller effectively suppresses image concentration decrease over time, ensuring high-quality image formation by utilizing polycarbonate's high durability and dielectric properties to attract sufficient toner, even with reduced drive torque and increased process speed.
Implementation Method 1
the first region comprises at least one kind of polycarbonate... utilizing polycarbonate's high durability and dielectric properties to attract sufficient toner
Implementation Method 2
a sufficient amount of toner can be attracted even in a case where the drive torque is reduced... the outer surface of the developing roller is constituted by at least a first region and a second region that has a higher conductivity than the first region
Data Source
AI summary
A developing roller includes a substrate that has a surface with conductivity and a conductive layer on the surface of the substrate, an outer surface of the developing roller is constituted by at least a first region and a second region that has a higher conductivity than the first region, the first region and the second region are disposed to be adjacent to each other, the first region includes at least one kind of polycarbonate, and the at least one kind of polycarbonate has a specific structure having a substituent in an aromatic ring of a main chain.