Transparent Toner Development Using Electrostatic Capacity and Contrast Potential
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Solution Overview
Problem
In electrophotographic image forming apparatuses, the use of transparent toner to achieve uniform glossiness is hindered by toner scattering and carrier adhesion issues, leading to image quality deterioration and non-uniform glossiness due to challenges in adjusting toner adherence and electrostatic charges.
Innovation Solution
The apparatus employs a first image bearing member with a higher electrostatic capacity for transparent toner and a second image bearing member with a lower capacity for chromatic toner, allowing for increased transparent toner adherence without excessive contrast potential, using a specific triboelectric charge and contrast potential to prevent scattering and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If transparent toner is used to achieve uniform glossiness, then glossiness uniformity is improved, but toner scattering occurs leading to image quality deterioration
Solution Approach 1:
The patent changes the electrostatic parameters by using a photosensitive member with higher electrostatic capacity and adjusting the contrast potential to a specific range (50-200V), which controls toner adherence and prevents scattering while achieving uniform glossiness
2Manufacturing precision
If transparent toner adherence is increased to improve glossiness uniformity, then glossiness uniformity is improved, but carrier adhesion occurs leading to image quality deterioration
Solution Approach 1:
The patent adjusts the electrostatic parameters including contrast potential (50-200V) and uses a photosensitive member with higher electrostatic capacity to control toner adherence at optimal levels, preventing both scattering and carrier adhesion
3Quantity of substance
If contrast potential is increased to increase transparent toner adherence, then toner adherence is improved, but toner scattering increases
Solution Approach 1:
The patent optimizes the contrast potential to a specific range (50-200V) and combines it with a photosensitive member having higher electrostatic capacity, achieving optimal toner adherence without excessive scattering
4Quantity of substance
If electrostatic capacity of photosensitive member is increased to increase transparent toner adherence, then toner adherence is improved, but device complexity increases
Solution Approach 1:
The patent specifies a photosensitive member with higher electrostatic capacity (C>100μF/m²) and controls contrast potential within 50-200V, achieving optimal toner adherence through parameter optimization rather than complex structural modifications
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 approach results in a uniform glossiness across the image, preventing toner scattering and carrier adhesion, thereby enhancing image quality and maintaining the integrity of the image forming process.
Implementation Method 1
a first developing means forming a toner image of transparent toner on an electrostatic latent image formed on said first image bearing member
Implementation Method 2
using a specific triboelectric charge and contrast potential to prevent scattering and adhesion
Implementation Method 3
using a specific triboelectric charge and contrast potential to prevent scattering and adhesion
Data Source
AI summary
An image forming apparatus includes a first image bearing member; a first developing means forming a toner image of transparent toner on an electrostatic latent image formed on the first image bearing member; a second image bearing member having an electrostatic capacity per unit area which is smaller than an electrostatic capacity per unit area of the first image bearing member; second developing means for forming a toner image of chromatic toner on an electrostatic latent image formed on the second image bearing member, wherein a maximum toner amount of the toner image formed on the first image bearing member is larger than a maximum toner amount of the toner image formed on the second image bearing member; and transferring means for transferring the transparent toner image and the chromatic toner image onto a transfer material.