Charging Member Surface Layer for Crack-Free Image Uniformity
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Solution Overview
Problem
Existing charging members suffer from density unevenness and surface cracking due to improper content of non-conductive inorganic particles in the surface layer, which affects image quality and durability.
Innovation Solution
A charging member design with a surface layer containing 5 to 40 parts by mass of non-conductive inorganic particles relative to 100 parts by mass of resin, featuring thermal conductivity of 20 W/(m·k) or more, using particles like nitride, oxide, or carbide particles with a primary diameter of 5 to 20 µm, enhances heat dissipation and prevents surface cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the surface layer contains less than 5 parts by mass or over 40 parts by mass of non-conductive inorganic particles relative to 100 parts by mass of resin, then the manufacturing is easier, but density unevenness occurs in the image and surface cracking occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of non-conductive inorganic particles within 5-40 parts by mass relative to 100 parts by mass of resin. This specific parameter range resolves the contradiction by preventing both density unevenness and surface cracking while maintaining manufacturability. The parameter optimization balances ease of manufacture with image quality and surface integrity.
Solution Approach 2:
The patent uses composite materials by combining resin with non-conductive inorganic particles having specific thermal conductivity (20 W/(m·k) or more). This composite structure in the surface layer improves heat dissipation properties while maintaining mechanical integrity, thereby preventing surface cracking and ensuring reliable image formation without compromising manufacturing ease.
2Temperature
If the surface layer contains non-conductive inorganic particles with improper content, then the thermal conductivity is insufficient, but increasing particle content causes surface cracking
Solution Approach 1:
The patent optimizes the parameter of inorganic particle content to 5-40 parts by mass relative to 100 parts by mass of resin, and selects particles with thermal conductivity of 20 W/(m·k) or more. This parameter optimization achieves sufficient thermal conductivity for heat dissipation while preventing surface cracking by avoiding excessive particle content that would compromise surface strength.
Solution Approach 2:
The patent applies local quality by using non-conductive inorganic particles with high thermal conductivity (20 W/(m·k) or more) specifically in the surface layer. This creates a localized thermal management solution where the surface layer has enhanced heat dissipation capability without compromising the overall structural integrity and surface strength of the charging member.
3Loss of energy
If the surface layer contains insufficient non-conductive inorganic particles, then heat dissipation is poor, but adding more particles increases the risk of contamination and surface defects
Solution Approach 1:
The patent determines the optimal parameter range for inorganic particle content as 5-40 parts by mass relative to 100 parts by mass of resin. This optimized content ensures sufficient heat dissipation efficiency while minimizing contamination and surface defects. The parameter control balances thermal management needs with surface quality and contamination resistance.
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 design effectively prevents density unevenness and surface cracking, maintaining image quality and extending the charging member's lifespan by improving thermal conductivity and reducing contamination.
Implementation Method 1
the thermal conductivity of the non-conductive inorganic particles is 20 W/(m·k) or more
Data Source
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AI summary
A charging member (30) includes a support member (32), an elastic layer (34) provided on the support member, and a surface layer (36) provided on the elastic layer, in which the surface layer contains a resin, conductive particles, and non-conductive inorganic particles, and the surface layer contains 5 parts by mass or more and 40 parts by mass or less of the non-conductive inorganic particles relative to 100 parts by mass of the resin.