Carrier Particle-Size Distribution for Adhesion and Ghost-Image Control
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Solution Overview
Problem
Existing image forming technologies face challenges in achieving long-term stability of high image quality, particularly in reducing carrier adhesion to solid printed areas and ghost images, which are characterized by variations in color density.
Innovation Solution
A carrier is developed with a specific particle size distribution, comprising core particles coated with a film, where the 50% particle diameter (D50) is between 40 μm and 60 μm, and the content of particles less than 24 μm is controlled to minimize carrier adhesion and ghost images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carrier resistance is reduced to achieve high image quality stability, then image quality stability is improved, but carrier adhesion to solid printed areas occurs more easily
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of the carrier, specifically setting D50 between 40-60 μm, limiting particles <22 μm to <0.10% by number, and controlling particles <24 μm to 0.10-5.00% by number. This optimization of physical parameters allows the carrier to maintain appropriate resistance characteristics while reducing adhesion to solid printed areas, thereby resolving the contradiction between image quality stability and carrier adhesion
Solution Approach 2:
The patent employs composite materials by combining carrier particles with specific size distribution characteristics and coating films containing inorganic fine particles. This composite structure enables the carrier to achieve both low adhesion properties and stable image quality over long-term operation, resolving the technical contradiction through material composition optimization
2Reliability
If the carrier particle size is optimized to reduce ghost images, then image quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for particle size distribution (D50: 40-60 μm, particles <22 μm: <0.10% by number, particles <24 μm: 0.10-5.00% by number) that effectively reduce ghost images while establishing clear manufacturing specifications. These parameter settings balance image quality improvement with manufacturability by providing achievable target ranges rather than overly stringent requirements
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 carrier adhesion and ghost images over time, maintaining image quality by optimizing particle size distribution and coating film properties.
Implementation Method 1
a particle including a core particle and a coating film that covers the core particle
Implementation Method 2
a latent electrostatic image bearer, a charger to charge the surface of the latent electrostatic image bearer to form a latent electrostatic image
Data Source
AI summary
A carrier contains a particle containing a core particle and a coating film that covers the core particle, wherein the carrier has a 50 percent particle diameter (D50) is between 40 μm and 60 μm, the content of the carrier having a particle diameter of less than 22 μm is less than 0.10 percent by number, and the content of the carrier having a particle diameter of less than 24 μm is between 0.10 percent by number and 5.00 percent by number.