Undercoat Layer Polymer Stabilizes Potential in Electrophotographic Photosensitive Members
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrophotographic photosensitive members experience fluctuations in potential during continuous image output, affecting image quality and color reproducibility, particularly due to instability in the undercoat layer.
Innovation Solution
Incorporating a polymer of a specific compound with a structure represented by formula (1) into the undercoat layer, which contains polymerizable functional groups such as hydroxy, thiol, or carboxyl groups, to stabilize the electron transporting material and reduce potential fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transporting materials are incorporated into the undercoat layer, then potential fluctuation is suppressed, but the stability of potential over extended operation deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the electron transporting material by introducing a specific molecular framework with formula (1) containing aromatic rings, carbonyl groups, and electron-donating substituents. This structural parameter change enables the material to maintain stable electron transportation over extended operational periods while suppressing potential fluctuations.
Solution Approach 2:
The patent creates a composite undercoat layer by combining the specifically structured electron transporting material (formula (1)) with conventional polymer binders and additives. This composite approach leverages the superior electron transport properties of the new material while maintaining the mechanical and chemical stability of the polymer matrix, achieving both immediate potential stabilization and long-term operational durability.
2Reliability
If electron transporting material is added to the undercoat layer, then potential fluctuation during output is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by concentrating the complex electron transporting material (formula (1)) specifically in the undercoat layer where it is most needed for potential stabilization, rather than distributing it throughout the entire photosensitive member. This localized approach achieves effective potential control while minimizing the complexity impact on other components.
Solution Approach 2:
The patent optimizes the concentration and molecular structure parameters of the electron transporting material in the undercoat layer to achieve effective potential stabilization with minimal material addition. By carefully controlling the amount of formula (1) material incorporated, the patent reduces manufacturing complexity while maintaining reliability.
3Manufacturing precision
If existing electron transporting materials are used, then color reproducibility is maintained, but image quality deteriorates after extended output
Solution Approach 1:
The patent changes the molecular parameters of the electron transporting material by using the specific formula (1) structure with aromatic rings and carbonyl groups, which enables maintained image quality over extended output periods. The new material's molecular characteristics allow it to sustain stable electron transportation without the degradation that occurs with conventional materials during continuous operation.
Solution Approach 2:
The patent replaces conventional electron transporting materials with a newly developed material (formula (1)) that is designed for long-term durability. Although the new material represents an investment in R&D, it eliminates the need for frequent replacement of undercoat layers and maintains consistent image quality throughout the extended operational life of the photosensitive member.
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 effectively suppresses potential fluctuations, enhancing image quality and color reproducibility even after outputting a large number of sheets by maintaining electron transportation efficiency and reducing electron trapping.
Implementation Method 1
the undercoat layer contains a polymer of a composition containing a compound represented by the formula (1)... effectively suppresses potential fluctuations, enhancing image quality and color reproducibility even after outputting a large number of sheets by maintaining electron transportation efficiency
Implementation Method 2
a compound represented by the formula (1)... having 2 or more polymerizable functional groups... the polymerizable functional groups each include a hydroxy group, a thiol group, an amino group, or a carboxyl group
Data Source
AI summary
Provided is an electrophotographic photosensitive member including a support, an undercoat layer formed on the support, and a photosensitive layer formed on the undercoat layer, in which the undercoat layer contains a polymer of a composition containing a compound represented by the formula (1).