Photoconductor Ionization Potential Alignment for Residual Image Reduction
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Solution Overview
Problem
Existing image forming methods struggle to effectively cancel negative residual images in electrophotography, leading to reduced productivity and increased toner consumption due to the limitations of current techniques in maintaining uniform surface voltage and energy level barriers in the photoconductor and toner interface.
Innovation Solution
The method involves a photoconductor with an electroconductive substrate, an intermediate layer, and a photosensitive layer comprising a laminate structure of a charge generating layer and a charge transport layer, where the ionization potential of the photoconductor and toner surfaces are optimized to within specific ranges (|Ip (photoconductor) - Ip (toner)| ≤ 0.18 eV, ensuring ideal energy level alignment and reduced residual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image forming methods are used, then image formation can be performed, but negative residual images appear and image quality deteriorates
Solution Approach 1:
The invention changes the energy level parameters of the photoconductor surface by controlling the ionization potential to be within a specific range (5.0 eV to 6.0 eV) and adjusting the electron affinity. These parameter changes prevent the formation of negative residual images by optimizing the energy level alignment between the photoconductor and toner, thereby improving image quality without requiring additional structural components.
2Manufacturing precision
If existing techniques are used to cancel negative residual images, then some improvement can be achieved, but productivity decreases and toner consumption increases
Solution Approach 1:
The invention applies preliminary action by pre-configuring the photoconductor's energy levels (ionization potential and electron affinity) before the imaging process begins. This preliminary optimization of the photoconductor's electronic properties prevents negative residual images from forming in the first place, eliminating the need for subsequent cancellation operations and maintaining high productivity while reducing toner consumption.
3Ease of manufacture
If the photoconductor and toner energy levels are not optimized, then simpler materials can be used, but surface voltage instability occurs and residual images increase
Solution Approach 1:
The invention specifies precise parameter ranges for the photoconductor's ionization potential (5.0 eV to 6.0 eV) and electron affinity that optimize both surface voltage stability and compatibility with conventional toner materials. By controlling these energy level parameters, the invention achieves stable surface voltage and minimal residual images while maintaining ease of manufacture through the use of standard photoconductor materials.
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 minimizes negative residual images by stabilizing the surface voltage and energy matching between the photoconductor and toner, enhancing image quality and productivity while reducing toner consumption.
Implementation Method 1
the ionization potential of the surface of the photoconductor and the ionization potential of the surface of the toner satisfy the following relations 1 and 2, |Ip (the surface of the photoconductor)−Ip (the surface of the toner)|≤5.53 (eV)
Data Source
AI summary
An image forming method includes forming an image with a toner using a photoconductor in which an intermediate layer and a photosensitive layer including a charge generating layer and a charge transport layer are formed overlying an electroconductive substrate, wherein the ionization potential of the surface of the photoconductor and the ionization potential of the surface of the toner satisfy the following relations 1 and 2,|Ip (the surface of the photoconductor)−Ip (the surface of the toner)|≤5.53 (eV) Relation 15.45 (eV)≤Ip (the surface of the photoconductor)≤5.53 (eV) Relation 2where Ip (the surface of the photoconductor) represents the ionization potential of the surface of the photoconductor and Ip (the surface of the toner) represents the ionization potential of the surface of the toner.