Electrophotographic Photoreceptor Surface Layer with Segmented Conductive Particles
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Solution Overview
Problem
Existing electrophotographic photoreceptors face challenges in achieving both electrical characteristics and mechanical strength while maintaining image quality, as conductive particles with large diameters can lead to scattered latent images and reduced abrasion resistance.
Innovation Solution
An electrophotographic photoreceptor with a charge generating layer, charge transporting layer, and an outermost surface layer containing composite structural particles coated with oxygen-deficient conductive tin oxide, which have an L value of 80 to 95 and primary particles with an average diameter of 35 to 200 nm, providing both mechanical strength and electrical characteristics without image blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conductive particles with large particle diameters are added to the surface layer, then abrasion resistance is improved, but the dot diameter of the latent image becomes scattered and image quality deteriorates
Solution Approach 1:
The conductive particles are segmented into multiple size ranges (0.1 μm to 10 μm) rather than using a single large particle size. This segmentation allows smaller particles to maintain image precision while larger particles provide abrasion resistance, resolving the contradiction between mechanical strength and manufacturing precision.
Solution Approach 2:
The invention changes the particle diameter parameter from a single large size to a distributed range (0.1 μm to 10 μm) with specific concentration ratios. This parameter change enables the surface layer to simultaneously achieve adequate abrasion resistance through larger particles and precise dot diameter through smaller particles.
2Reliability
If conductive particles are added to the surface layer, then electrical characteristics are improved, but the particles serve as grounding points for discharging and reduce mechanical strength
Solution Approach 1:
The invention changes the particle size parameter to a specific range (0.1 μm to 10 μm) with controlled concentration (0.1 to 10 parts by mass per 100 parts by mass of binder resin). This parameter optimization ensures sufficient conductive pathways for electrical characteristics while limiting the number of grounding points that would weaken mechanical strength.
Solution Approach 2:
The surface layer uses a composite material system combining binder resin with conductive particles in optimized proportions. This composite approach balances the electrical conductivity provided by particles with the mechanical strength provided by the resin matrix, resolving the contradiction between electrical characteristics and mechanical strength.
3Reliability
If conductive particles with low volume resistance value are added, then the number of deteriorated sites due to discharging is reduced, but abrasion resistance improves while image delicacy is lost
Solution Approach 1:
The conductive particle population is segmented into different size ranges where particles of 0.1 μm to 1 μm maintain image delicacy by not scattering dot diameters, while particles up to 10 μm provide abrasion resistance and discharge resistance. This segmentation resolves the contradiction between resistance to discharging and image delicacy.
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 effectively reduces discharge deterioration, maintains image quality, and enhances cleaning performance, ensuring both mechanical strength and electrical characteristics are achieved without image blur, thus providing a photoreceptor capable of forming delicate images.
Implementation Method 1
the outermost surface layer contains composite structural particles obtained by coating inorganic particles with oxygen-deficient conductive tin oxide
Data Source
AI summary
An electrophotographic photoreceptor has a charge generating layer, a charge transporting layer, and an outermost surface layer laminated in this order on a conductive support, wherein the outermost surface layer contains composite structural particles obtained by coating inorganic particles with oxygen-deficient conductive tin oxide, and the composite structural particles have an L value of 80 to 95, and primary particles thereof have an average particle diameter of 35 to 200 nm.