Photoreceptor Conductive Substrate Roughness for Reduced Wobble
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Solution Overview
Problem
Conductive substrates for electrophotographic photoreceptors experience wobbling during rotation, leading to image quality degradation due to uneven surface roughness at the end portions, which affects the engagement with flanges and causes shaking.
Innovation Solution
The conductive substrate is designed with a specific surface roughness profile, characterized by a sum S of intensity within the period range of 0.01 mm to 0.1 mm in the power spectrum of the inner circumferential surface at both end portions, ranging from 0.02 to 0.10, to minimize wobbling and reduce image quality degradations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface roughness of the inner circumferential surface at both end portions is made smooth, then the engagement with flanges is improved, but wobbling during rotation increases due to unevenness
Solution Approach 1:
The patent applies different surface roughness characteristics to different locations: the inner circumferential surface at both end portions has a specific roughness profile (sum S of 0.02-0.10) to ensure flange engagement, while other portions of the conductive substrate maintain different characteristics. This local differentiation resolves the contradiction by optimizing each region for its specific function.
Solution Approach 2:
The patent changes the surface roughness parameter (quantified as sum S in the power spectrum) to a specific range (0.02-0.10) to simultaneously achieve good engagement and reduced wobbling. This parameter optimization resolves the contradiction by finding the optimal value that balances both requirements.
2Stability of the object's composition
If the surface roughness is increased to reduce wobbling, then rotation stability is improved, but image quality degrades due to increased surface unevenness
Solution Approach 1:
The patent confines the specific surface roughness profile (sum S of 0.02-0.10) to the inner circumferential surface at both end portions only, while other surfaces maintain different characteristics. This localized application ensures rotation stability without compromising image quality in the imaging regions.
Solution Approach 2:
The patent optimizes the surface roughness parameter (sum S) to a specific range (0.02-0.10) that simultaneously achieves reduced wobbling and maintains image quality. This precise parameter control resolves the contradiction between rotation stability and image quality.
3Stability of the object's composition
If the surface roughness profile is optimized for reduced wobbling, then rotation stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies a quantitative range for the surface roughness parameter (sum S of 0.02-0.10) that can be achieved through conventional surface processing methods. This parameter-based specification simplifies manufacturing by providing clear targets rather than complex geometric requirements.
Data Source
AI summary
A conductive substrate for an electrophotographic photoreceptor includes a cylindrical conductive substrate, in which in a power spectrum obtained through fast Fourier transform of the roughness profile in the axial direction of the inner circumferential surface of the conductive substrate at both end portions in the axial direction, the sum S of intensity within the period range of 0.01 mm to 0.1 mm is 0.02 or greater and 0.10 or less.