Electrostatic Charge Image Developing Carrier Surface Area Ratio
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Solution Overview
Problem
Existing electrostatic charge image developing carriers face challenges in maintaining image density consistency during high-density printing after continuous printing with a small amount of images, due to excessive charging and changes in toner composition over time.
Innovation Solution
An electrostatic charge image developing carrier is designed with a magnetic particle and a resin coating layer containing inorganic particles, where the surface area to plan view area ratio is between 1.020 and 1.100, and the magnetic particle's volume average diameter and fluidity are within specific ranges to inhibit density changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the surface area to plan view area ratio B/A is less than 1.020 or more than 1.100, then the carrier surface is smoother, but image density changes occur during high-density printing after continuous printing with small amount of images
Solution Approach 1:
The patent specifies a precise parameter range for the surface area to plan view area ratio (B/A) of 1.020 to 1.100, along with volume average particle diameter (25-34 μm) and fluidity (28-36 s/50 g). By controlling these physical parameters within specific ranges, the carrier achieves optimal balance between surface smoothness and image density stability during high-density printing operations.
2Stability of the object's composition
If the volume average particle diameter of magnetic particles is less than 25 μm or more than 34 μm, then the carrier properties change, but density change inhibitory property deteriorates
Solution Approach 1:
The patent defines a specific particle diameter range of 25-34 μm for magnetic carriers. This parameter control ensures that the carriers maintain appropriate size for stable toner adhesion while preventing excessive charging that would occur with smaller particles or agglomeration issues with larger particles, thereby maintaining density stability.
3Stability of the object's composition
If the fluidity of magnetic particles is less than 28 s/50 g or more than 36 s/50 g, then the particle flow characteristics change, but image density stability is compromised
Solution Approach 1:
The patent specifies fluidity within 28-36 s/50 g to optimize particle flow characteristics. This range ensures sufficient fluidity for uniform toner distribution and carrier movement in the developing device, while preventing excessive fluidity that would reduce toner adhesion stability and cause density variations during printing operations.
4Productivity
If continuous printing with small amount of images is performed, then the carrier charges excessively, but high-density printing after this results in density changes
Solution Approach 1:
The patent optimizes multiple carrier parameters simultaneously - surface area to plan view area ratio (1.020-1.100), volume average particle diameter (25-34 μm), and fluidity (28-36 s/50 g). This multi-parameter optimization balances the carrier's charging characteristics to prevent excessive charging during continuous low-volume printing, thereby maintaining stable toner adhesion and image density during subsequent high-density printing operations.
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 carrier effectively maintains image density stability by balancing the adhesion of external additives, reducing changes in toner charging state, and preventing excessive trapping of additives, thus ensuring consistent image quality during high-density printing.
Implementation Method 1
the resin coating layer contains inorganic particles
Implementation Method 2
a magnetic particle
Data Source
AI summary
An electrostatic charge image developing carrier contains a magnetic particle and a resin coating layer coating the magnetic particle, in which the resin coating layer contains inorganic particles, a ratio B/A of a surface area B of the carrier to a plan view area A of the carrier that are obtained by three-dimensional analysis of a surface of the carrier is 1.020 or more and 1.100 or less, a volume average particle diameter of the magnetic particle is 25 μm or more and 34 μm or less, and a fluidity of the magnetic particle is 28 s/50 g or more and 36 s/50 g or less.