Photoreceptor Protective Layer Minimizes Toner Adhesion
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Solution Overview
Problem
In electrophotographic image forming processes, the use of small-diameter toner with both metallic oxide and metallic soap as external additive agents leads to the formation of comet-like deposits on the photoreceptor surface, causing image defects and reducing transfer efficiency, especially with increased printing volume.
Innovation Solution
An image forming method and apparatus that includes a photoreceptor with a conductive support, a photosensitive layer, and a protective layer containing a resin component derived from a curable compound and alumina particles, which minimizes comet-like deposits by reducing adhesion between the photoreceptor and toner, thereby maintaining image quality and transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both metallic oxide and metallic soap are used as external additive agents in small-diameter toner, then transfer efficiency is improved and adhesion is reduced, but comet-like deposits form on the photoreceptor surface causing image defects
Solution Approach 1:
The patent removes metallic oxide from the external additive agents of the toner, retaining only metallic soap. This extraction eliminates the harmful interaction between metallic oxide and metallic soap that causes comet-like deposits, while preserving the transfer efficiency benefits of metallic soap coating on the photoreceptor surface.
Solution Approach 2:
The patent converts the potential harm of metallic soap (which can cause deposits when combined with metallic oxide) into a benefit by using it alone. The metallic soap provides effective adhesion reduction and transfer efficiency improvement without forming comet-like deposits, transforming a problematic combination into a successful single-agent solution.
2Duration of action of stationary object
If a protective layer with excellent abrasion resistance is used to prolong photoreceptor service life, then abrasion is minimized, but comet-like deposits increase noticeably
Solution Approach 1:
By removing metallic oxide from the toner's external additives, the patent eliminates the source of comet-like deposits that would otherwise accumulate on the protective layer surface during prolonged use, allowing the protective layer to maintain its abrasion resistance benefits without the harmful side effect of deposit formation.
3Manufacturing precision
If small-diameter toner is used to produce high-resolution images, then image resolution is improved, but transfer efficiency decreases due to increased adhesion
Solution Approach 1:
The metallic soap in the toner performs self-service by coating the photoreceptor surface during the development process, creating a thin film that reduces adhesion between the photoreceptor and toner particles. This self-applied coating improves transfer efficiency without requiring additional treatment steps, enabling small-diameter toner to achieve both high resolution and efficient transfer.
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 method prevents the formation of comet-like deposits on the photoreceptor surface even after prolonged use, ensuring no dropout or damage during the image forming process, thus maintaining high image quality and transfer efficiency.
Implementation Method 1
an electrophotographic photoreceptor comprising a conductive support provided thereon, at least a photoreceptive layer and a protective layer in this order; and developing an electrostatic latent image by a toner
Implementation Method 2
developing an electrostatic latent image by a toner on an electrophotographic photoreceptor
Data Source
AI summary
An image forming method and image forming apparatus based on the application thereof wherein comet-like deposits do not appear on the surface of the photoreceptor even after prolonged use of small-diameter toner, and there is no dropout or damage on the photoreceptor surface in the image forming process using an intermediate transfer member. This image forming method contains a process wherein the toner developed on an electrophotographic photoreceptor is transferred onto an intermediate transfer member, and the toner contains at least a metallic oxide and metallic soap added as external additive agents, and the protective layer contains a resin component obtained by reaction of at least a curable compound, and alumina particles.