Undercoat Layer Ghost Suppression via Benzophenone Complex
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Solution Overview
Problem
The increased sensitivity of charge generating substances in electrophotographic photosensitive members leads to charge retention in the photosensitive layer, causing ghost phenomena such as increased image density in irradiated areas or decreased density in non-irradiated areas, which degrades image quality, especially in high-speed and high-quality color electrophotographic apparatuses.
Innovation Solution
Incorporating metal oxide particles and a benzophenone compound with an amino or hydroxy group into the undercoat layer, which forms an intramolecular charge transfer complex, reducing oxidation of metal oxide particles and facilitating smooth electron transfer between the photosensitive layer and the undercoat layer, thereby suppressing ghost phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charge generating substances with higher sensitivity are used, then charge generation efficiency is improved, but charge retention in the photosensitive layer increases causing ghost phenomena
Solution Approach 1:
The patent introduces an undercoat layer comprising metal oxide particles and a benzophenone compound with amino or hydroxy groups as an intermediary between the support and the photosensitive layer. This undercoat layer acts as a mediator to facilitate charge transfer and prevent charge retention in the photosensitive layer, thereby suppressing ghost phenomena while maintaining high charge generation efficiency from sensitive charge generating substances.
Solution Approach 2:
The patent employs a composite undercoat layer structure combining metal oxide particles (such as zinc oxide, titanium oxide, or aluminum oxide) with a benzophenone compound containing amino or hydroxy groups. This composite material configuration creates synergistic effects that enhance charge transfer capabilities and effectively suppress ghost images, resolving the contradiction between using highly sensitive charge generating substances and preventing charge retention.
2Reliability
If metal oxide particles are used in the undercoat layer, then charge transfer is facilitated, but oxidation of metal oxide particles occurs reducing effectiveness
Solution Approach 1:
The benzophenone compound with amino or hydroxy groups serves as a protective intermediary that interacts with the metal oxide particles. This compound forms a stable complex with the metal oxide, preventing oxidation of the metal oxide particles while maintaining their charge transfer functionality. The benzophenone compound acts as a stabilizing mediator between the metal oxide and the photosensitive layer.
Solution Approach 2:
The patent creates a composite undercoat layer where the benzophenone compound and metal oxide particles form a stable chemical complex. This composite structure protects the metal oxide from oxidation while preserving its charge transfer properties, thereby maintaining long-term effectiveness in suppressing ghost phenomena.
3Ease of manufacture
If conventional undercoat layer composition is used, then manufacturing is simple, but ghost phenomenon suppression is insufficient
Solution Approach 1:
The patent employs a composite undercoat layer combining metal oxide particles and benzophenone compound, which can be manufactured by mixing these components in a binder solution and applying to the support. This approach maintains relative manufacturing simplicity while significantly improving ghost phenomenon suppression compared to conventional undercoat layers.
Solution Approach 2:
The patent modifies the chemical composition parameters of the undercoat layer by incorporating specific metal oxide particles and benzophenone compounds with amino or hydroxy groups. This parameter change in the undercoat layer composition enables effective ghost suppression while maintaining feasible manufacturing processes.
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 ghost phenomena, maintaining image quality across various environments and repeated use of the photosensitive member, enhancing the performance of electrophotographic apparatuses by ensuring consistent image density and reducing image defects.
Implementation Method 1
Incorporating metal oxide particles and a benzophenone compound with an amino or hydroxy group into the undercoat layer, which forms an intramolecular charge transfer complex
Implementation Method 2
The undercoat layer has a charge-blocking function and thus suppresses the charge injection from the support to the photosensitive layer
Data Source
AI summary
An electrophotographic photosensitive member includes an undercoat layer that includes metal oxide particles and a compound having at least three hydroxyl groups and a carbonyl or dicarbonyl group.