Electrophotographic Photoreceptor Thickness Ratios Ghost Prevention
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Solution Overview
Problem
Existing electrophotographic photoreceptors suffer from issues such as ghosts and color spots due to inadequate thickness ratios of charge transport and undercoat layers, which affect image quality.
Innovation Solution
An electrophotographic photoreceptor with a conductive substrate, an undercoat layer, and a lamination type or single layer photosensitive layer containing a charge generation layer and a charge transport layer, where the charge transport layer includes a charge transport material and a polyester resin, with specific thickness ratios and layer configurations to prevent ghosts and color spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness ratio of charge transport layer to undercoat layer is outside the range of 0.70≤As/Bs≤4.80, then image quality deteriorates with ghosts and color spots, but adjusting the thickness ratio requires precise control of multiple layer parameters
Solution Approach 1:
The patent applies parameter changes by establishing a specific numerical range for the thickness ratio As/Bs (0.70≤As/Bs≤4.80) and absolute thickness limits (27≤As≤50 μm, 10≤Bs≤40 μm). This transforms the quality control problem into a measurable parameter optimization, where adjusting the thickness ratio within the specified range directly improves image quality by preventing ghosts and color spots while maintaining manufacturability.
2Reliability
If the charge transport layer thickness As is increased to improve charge transport performance, then charge transport efficiency improves, but the thickness ratio As/Bs increases and may exceed the optimal range causing image defects
Solution Approach 1:
The patent resolves this contradiction by defining both the absolute thickness range of the charge transport layer (27≤As≤50 μm) and its relationship to the undercoat layer thickness through the ratio constraint (0.70≤As/Bs≤4.80). This dual-parameter approach ensures that charge transport efficiency is maintained through sufficient layer thickness while preventing image defects by keeping the ratio within the optimal range, thereby balancing performance and quality.
3Strength
If the undercoat layer thickness Bs is increased to improve substrate protection, then mechanical strength improves, but the thickness ratio As/Bs decreases and may fall below the optimal range causing image defects
Solution Approach 1:
The patent addresses this contradiction by specifying both the absolute thickness range for the undercoat layer (10≤Bs≤40 μm) and its proportional relationship to the charge transport layer through the ratio constraint (0.70≤As/Bs≤4.80). This ensures that the undercoat layer provides sufficient mechanical protection while maintaining the appropriate thickness ratio to prevent image quality defects such as ghosts and color spots.
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 proposed configuration ensures that ghosts and color spots are minimized, maintaining image quality by optimizing the thickness ratios of the charge transport and undercoat layers within the photoreceptor.
Implementation Method 1
the charge transport layer contains a charge transport material and a polyester resin
Implementation Method 2
a lamination type photosensitive layer disposed on the undercoat layer and including a charge generation layer and a charge transport layer
Data Source
AI summary
An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer disposed on the conductive substrate, and a lamination type photosensitive layer disposed on the undercoat layer and including a charge generation layer and a charge transport layer, in which the charge transport layer contains a charge transport material and a polyester resin, and in a case where an average thickness of the charge transport layer is defined as As (μm) and an average thickness of the undercoat layer is defined as Bs (μm), expressions 27≤As≤50, 10≤Bs≤40, and 0.70≤As/Bs≤4.80 are satisfied.