Charging Member Elastic Modulus for Image Streak Reduction
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Solution Overview
Problem
Image forming apparatuses face issues with streaky image defects due to driven failure of the charging member, which is exacerbated by high friction coefficients and inadequate elastic modulus of the charging member, leading to increased toner and external additive adhesion and poor charging performance.
Innovation Solution
An image forming apparatus with an electrophotographic photoreceptor having a surface friction coefficient of 0.8 or less and a charging member featuring a conductive base material with an elastic layer having a storage elastic modulus of 5.0 MPa or less at 100 Hz, which reduces driven failure and adhesion of toner and external additives, thereby suppressing streaky image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the charging member has high friction coefficient, then the contact between charging member and photoreceptor is improved, but driven failure occurs and streaky image defects increase
Solution Approach 1:
The patent changes the physical parameters of the elastic layer by controlling its storage elastic modulus to be 5.0 MPa or less at 100 Hz. This parameter adjustment optimizes the balance between friction (contact force) and driven performance, preventing both driven failure and streaky image defects while maintaining reliable charging function.
2Stability of the object's composition
If the storage elastic modulus of the elastic layer is more than 5.0 MPa at 100 Hz, then the structural stability is improved, but streaky image defects occur due to increased toner and external additive adhesion
Solution Approach 1:
The patent precisely controls the storage elastic modulus parameter of the elastic layer to be 5.0 MPa or less at 100 Hz. This parameter optimization reduces the adhesion of toner and external additives to the charging member surface, thereby suppressing streaky image defects while maintaining sufficient structural stability for reliable operation.
3Strength
If the charging member material is made harder, then the durability is improved, but the adhesion of toner and external additives increases causing image defects
Solution Approach 1:
The patent employs a composite structure consisting of a charging member with an elastic layer (storage elastic modulus ≤5.0 MPa at 100 Hz) and a surface layer. This composite material design achieves both durability and low toner adhesion by combining materials with complementary properties, preventing streaky image defects while maintaining long-term reliability.
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 configuration effectively suppresses streaky image defects by ensuring proper contact and reduced adhesion between the charging member and photoreceptor, enhancing image quality and charging efficiency.
Implementation Method 1
an elastic layer provided on the conductive base material and having a storage elastic modulus G of 5.0 MPa or less at 100 Hz
Implementation Method 2
a charging device that is in contact with and charges the surface of the electrophotographic photoreceptor
Data Source
AI summary
An image forming apparatus includes an electrophotographic photoreceptor having a friction coefficient of a surface of 0.8 or less; a charging device including a charging member that is in contact with and charges the surface of the electrophotographic photoreceptor and includes a conductive base material, an elastic layer provided on the conductive base material and having a storage elastic modulus G of 5.0 MPa or less at 100 Hz, and a surface layer provided on the elastic layer; an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the electrophotographic photoreceptor; a developing device that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor to form a toner image by a developer containing a toner; and a transfer device that transfers the toner image to a surface of a recording medium.