Electrophotographic Member Elastic Layer Thermal Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electrophotographic members face challenges in achieving high thermal conductivity in the thickness direction while maintaining low heat capacity and preventing image defects due to peeling discharge, particularly in low-temperature and low-humidity environments, where the surface resistivity is low, leading to toner adsorption issues.
Innovation Solution
An electrophotographic member with an elastic layer containing silicone rubber and metal silicon fillers, where the area ratios of fillers are controlled to ensure high thermal conductivity and volume resistivity, and the use of bound rubber or oxide films on filler surfaces to enhance volume resistivity, preventing peeling discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the content of metal silicon powder in the elastic layer is increased to improve thermal conductivity, then thermal conductivity is improved, but hardness of the elastic layer rises and durability reduces
Solution Approach 1:
The patent applies parameter changes by precisely controlling the area ratio of metal silicon fillers in the elastic layer to be 35-45%, and controlling the average particle diameter to be 1-20 μm. This optimization of parameters achieves the desired thermal conductivity while preventing excessive hardness increase and maintaining durability.
Solution Approach 2:
The patent uses composite materials by combining silicone rubber with metal silicon fillers in a specific composition ratio. This composite structure allows the elastic layer to achieve high thermal conductivity from the metal silicon fillers while the silicone rubber matrix maintains flexibility and prevents excessive hardness, resolving the contradiction between thermal conductivity and durability.
2Temperature
If the content of metal silicon powder is increased to improve thermal conductivity, then thermal conductivity is improved, but the elastic layer becomes more prone to peeling discharge in low-temperature and low-humidity environments
Solution Approach 1:
The patent controls the area ratio of metal silicon fillers within 35-45% and particle diameter within 1-20 μm to optimize the balance between thermal conductivity and volume resistivity. This parameter optimization prevents peeling discharge by maintaining adequate surface resistivity while achieving the required thermal conductivity performance.
Solution Approach 2:
The composite structure of silicone rubber and metal silicon fillers in specific proportions creates an elastic layer that simultaneously achieves high thermal conductivity and sufficient volume resistivity. The silicone rubber matrix provides insulating properties that prevent peeling discharge, while the metal silicon fillers provide thermal conductivity, resolving the contradiction between these two properties.
3Reliability
If the area ratio of metal silicon fillers is reduced to prevent peeling discharge, then reliability is improved, but thermal conductivity decreases
Solution Approach 1:
The patent optimizes the area ratio of metal silicon fillers to the range of 35-45% and controls particle diameter to 1-20 μm. This optimized parameter range achieves the maximum possible thermal conductivity while maintaining sufficient volume resistivity to prevent peeling discharge, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent creates an optimized composite material structure with silicone rubber and metal silicon fillers in specific proportions (35-45% area ratio). This composite structure achieves the optimal balance where thermal conductivity is maximized while volume resistivity remains sufficient to prevent peeling discharge, resolving the contradiction between thermal performance and reliability.
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 solution provides a high-quality electrophotographic image by ensuring stable thermal conductivity and high volume resistivity, effectively preventing peeling discharge and maintaining image quality across varying environmental conditions.
Implementation Method 1
an elastic layer containing a silicone rubber and metal silicon fillers dispersed in the silicone rubber... the elastic layer has λ of 1.30 W/(m·K) or more, where λ is a thermal conductivity of the elastic layer in a thickness direction
Implementation Method 2
the elastic layer has ρV of 9.0 LOG Ω·cm or more, where ρV is a common logarithm value of a volume resistivity... the use of bound rubber or oxide films on filler surfaces to enhance volume resistivity, preventing peeling discharge
Data Source
AI summary
An electrophotographic member having an endless shape comprises: a substrate; and an elastic layer on an outer peripheral surface thereof. The elastic layer contains a silicone rubber and metal silicon fillers dispersed in the silicone rubber. An average of area ratios of the metal silicon fillers in respective first binarized images is 42% or less, and an average of area ratios of the metal silicon fillers in respective second binarized images is 42% or less. The elastic layer has λ of 1.30 W/(m·K) or more, where λ is a thermal conductivity of the elastic layer in a thickness direction thereof, and the elastic layer has ρV of 9.0 LOG Ω·cm or more, where ρV is a common logarithm value of a volume resistivity thereof.