Intermediate Transfer Belt Surface Potential Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image formation apparatuses face challenges in stabilizing image quality across various environments due to inconsistencies in toner transfer efficiency and surface potential of intermediate transfer belts.
Innovation Solution
A belt unit with a specific surface potential of not more than 20 volts, achieved by using a polyimide belt with controlled carbon black dispersion and surface resistivity, ensures stable image quality by maintaining a low current dependence and high secondary transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single layer resin intermediate transfer belt is used, then the device complexity is reduced, but the image quality stability deteriorates
Solution Approach 1:
The intermediate transfer belt is divided into multiple functional layers: a base resin layer and a surface layer containing carbon black particles. This segmentation allows each layer to perform its specific function - the resin layer provides structural integrity while the carbon black layer controls surface potential and electrical characteristics, thereby stabilizing image quality without excessive complexity
Solution Approach 2:
The belt uses a composite structure combining resin material with dispersed carbon black particles. This composite approach enables the belt to simultaneously exhibit dielectric properties from the resin and conductive properties from the carbon black, achieving optimal electrical characteristics for stable image formation across various environments
2Ease of manufacture
If the surface potential of the belt is not controlled, then the manufacturing process is simpler, but the secondary transfer efficiency deteriorates
Solution Approach 1:
The invention controls the surface potential parameter of the belt by adjusting the carbon black particle concentration and distribution in the surface layer. By changing this physical parameter within a specific range, the belt achieves optimal electrical characteristics that enable high secondary transfer efficiency (90% or more) while maintaining a practical manufacturing process
Solution Approach 2:
Instead of using complex mechanical or chemical treatments to control surface potential, the invention substitutes this with a controlled dispersion of carbon black particles in the resin matrix. This approach simplifies the manufacturing process while effectively controlling the electrical properties through material composition rather than complex processing
3Ease of manufacture
If the carbon black dispersion is not controlled, then the manufacturing process is easier, but the current dependence increases
Solution Approach 1:
The invention applies local quality by concentrating carbon black particles specifically in the surface layer of the belt rather than uniformly throughout the entire structure. This localized distribution ensures that the electrical characteristics are controlled where needed (at the surface) while keeping the bulk material simpler and easier to manufacture
Solution Approach 2:
By controlling the concentration and size distribution of carbon black particles as key parameters, the invention achieves optimal electrical properties. The carbon black content is controlled within a specific range (0.1-10 wt%) and particle size is controlled (0.1-10 μm), which stabilizes current dependence while maintaining manufacturability
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 stabilizes image quality across different environments by maintaining a high secondary transfer efficiency of 90% or more and reducing density unevenness between pages, while suppressing transfer streaks and density variations.
Implementation Method 1
A surface potential of the first surface of the belt is a voltage of not more than 20 volts, 0.1 seconds after an application of a voltage of 6000 volts
Implementation Method 2
using a polyimide belt with controlled carbon black dispersion and surface resistivity
Implementation Method 3
forms an electrostatic latent image by uniformly charging a surface of a photosensitive drum and exposing an image on the charged surface
Data Source
AI summary
A belt unit according to an embodiment may include: an endless belt including a first surface and a second surface opposite to the first surface; and a drive roller in contact with the second surface and configured to drive the endless belt. A surface potential of the first surface of the belt is a voltage of not more than 20 volts, 0.1 seconds after an application of a voltage of 6000 volts.