Electrophotographic Photoreceptor Substrate Cutting for Streak Reduction
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Solution Overview
Problem
Conventional methods for improving image quality in electrophotographic printing, such as adjusting cutting conditions and anodization, fail to adequately reduce interferential streaks in halftone images due to periodicity issues in the photoreceptor substrate, leading to image defects and low productivity.
Innovation Solution
The use of a cylindrical photoreceptor substrate with a specific autocorrelation coefficient range of 0.3-0.8, achieved through controlled cutting processing by varying the tool bit transfer speed and substrate rotation speed, to reduce periodicity and minimize interferential streaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting conditions are adjusted and blast processing or anodization is conducted, then surface treatment is improved, but cutting periodicity remains and image quality is insufficient
Solution Approach 1:
The invention changes the fundamental parameter of cutting periodicity by varying the tool bit transfer speed or substrate rotation speed during cutting processing. This creates a surface profile where autocorrelation coefficients at peaks other than lag 0 fall within 0.3-0.8, fundamentally altering the surface characteristics to eliminate interferential streaks while maintaining manufacturing feasibility
Solution Approach 2:
The invention introduces dynamic variation in cutting conditions by changing tool bit transfer speed or substrate rotation speed during the cutting process. This dynamic adjustment creates non-uniform cutting intervals that disrupt periodicity patterns, transforming the surface profile to eliminate image defects while maintaining production efficiency
2Manufacturing precision
If blast processing or anodization is conducted to improve surface quality, then surface treatment is enhanced, but productivity decreases due to additional processing steps
Solution Approach 1:
The invention extracts and eliminates the root cause of image defects (cutting periodicity) directly during the cutting process itself, rather than requiring separate post-processing steps like blast processing or anodization. This integration of the solution into the base manufacturing process eliminates additional processing steps and maintains productivity
Solution Approach 2:
The invention performs the surface profile optimization during the cutting processing itself, before any post-processing steps would be required. By establishing the correct surface characteristics (autocorrelation coefficients within 0.3-0.8) during the initial cutting operation, the need for subsequent blast processing or anodization is eliminated, thereby maintaining productivity
3Ease of manufacture
If cutting periodicity is not reduced, then conventional processing methods can be used, but interferential streaks appear in halftone images
Solution Approach 1:
The invention modifies cutting parameters (tool bit transfer speed or substrate rotation speed) during processing to create a surface profile with controlled autocorrelation coefficients (0.3-0.8). This parameter change eliminates cutting periodicity and associated interferential streaks while maintaining manufacturing simplicity, as the variation is implemented within the existing cutting operation rather than requiring separate processes
Data Source
AI summary
Reduced are interferential streaks in a halftone image, which are produced when using a cylindrical photoreceptor conductive substrate having been subjected to tool bit cutting processing, and provided are an electrophotographic photoreceptor capable of obtaining high image quality in response to a light printing field or the like and an image forming method employing the electrophotographic photoreceptor. Disclosed is an electrophotographic photoreceptor possessing a cylindrical substrate having been finished via cutting processing and provided thereon, a photosensitive layer, wherein among peaks other than at a lag of 0 in a correlogram of a substrate surface profile in a direction along a central axis of the substrate, a mean value from a maximum peak in height to a third peak in height is 0.3-0.8, each of the peaks in height corresponding to an autocorrelation coefficient.