Transfer Belt Resistivity Control for Image Transfer
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Solution Overview
Problem
Existing recording medium transport and transfer belts in electrophotographic image forming apparatuses face challenges in maintaining excellent image transfer performance and recording medium transport performance, particularly due to issues like abnormal discharge and varying transfer conditions.
Innovation Solution
A recording medium transport and transfer belt with a configuration of at least a base material layer and a surface layer, where the ratio of surface resistivity to volume resistivity at 500 V is 1.0 or more, and the difference in surface resistivity between 100 V and 500 V is 0.3 or less, to enhance transfer performance and reduce voltage dependence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface resistivity is increased to improve image transfer performance, then transfer efficiency is improved, but voltage dependence increases causing unstable transfer conditions
Solution Approach 1:
The patent applies parameter changes by precisely controlling the volume resistivity of the rubber layer and the surface resistivity of the coating layers to specific ranges. By setting the volume resistivity of the rubber layer to 10^8-10^11 Ω·cm and controlling the surface resistivity ratios (ρs500/ρv500 ≥ 1.0 and ρs100-ρs500 ≤ 0.3), the invention optimizes electrical parameters to achieve both high transfer performance and low voltage dependence, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent employs composite materials by creating a multi-layer structure consisting of a rubber layer and two coating layers (front surface coating layer and back surface coating layer). This composite structure allows the rubber layer to provide bulk electrical properties while the coating layers control surface electrical characteristics, enabling simultaneous optimization of transfer performance and voltage stability through the interaction of different material properties.
2Reliability
If the volume resistivity is adjusted to control electrostatic attraction, then transfer performance is improved, but recording medium transport performance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the electrical properties between the front surface coating layer and the back surface coating layer. The front surface coating layer (contacting the photoconductor) has specific resistivity characteristics optimized for image transfer, while the back surface coating layer (contacting the recording medium) has different characteristics optimized for recording medium transport. This spatial differentiation of electrical properties allows simultaneous optimization of both transfer performance and transport performance without mutual interference.
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 improves both image transfer and recording medium transport performance by increasing surface resistance while keeping voltage dependence low, thereby maintaining excellent transfer and transport efficiency.
Implementation Method 1
electrostatically attracts and transports the transfer material
Implementation Method 2
transfers toner from the photoconductor to the transfer paper by an electric field
Data Source
AI summary
A recording medium transport and transfer belt includes at least a base material layer and a surface layer, in which a ratio (ρs500/ρv500) between surface resistivity ρs500 and volume resistivity ρv500 at an applied voltage of 500 V is 1.0 or more, and a difference (ρs100−ρs500) between surface resistivity ρs100 at an applied voltage of 100 V and surface resistivity ρs500 at an applied voltage of 500 V is 0.3 or less.