Electrophotographic Carrier Core Exposure for Ghost Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrophotographic systems face issues with the ghost phenomenon, where image density varies due to toner consumption history, leading to inconsistent image quality and color reproducibility, despite existing solutions that fail to provide durable carriers with stable toner consumption and uniform image production.
Innovation Solution
A carrier with a core material exposed at an areal ratio of 0.1 to 5.0% and a coated layer comprising a binder resin and particulate material, where the particulate material is between 100 to 500 parts by weight per 100 parts of binder resin, providing controlled resistivity and durability to prevent toner scattering and ensure consistent image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a conventional carrier with complete coating is used, then durability is improved, but charge stability deteriorates leading to ghost phenomenon
Solution Approach 1:
The coating layer is designed with non-uniform thickness, creating locally thin regions that expose the core material surface. This local variation in coating quality allows the carrier to maintain overall durability while providing specific areas for effective charge control and toner interaction, resolving the contradiction between complete coating durability and charge stability.
2Quantity of substance
If toner amount on toner bearer is increased, then image density is improved, but ghost phenomenon worsens due to toner consumption history
Solution Approach 1:
The invention changes the electrical resistance parameter of the carrier by exposing core material surface through thin coating regions. This parameter change enables more effective charge control and uniform toner distribution, allowing consistent image quality regardless of toner consumption history, thus resolving the contradiction between toner amount and image consistency.
3Strength
If coated layer thickness is increased, then carrier durability is improved, but toner distribution uniformity deteriorates
Solution Approach 1:
The coating layer is designed with controlled thin regions that locally reduce thickness to expose the core material. This creates a non-uniform structure where most areas maintain protective coating strength while specific local regions enable effective charge control and uniform toner distribution, resolving the contradiction between overall durability and toner distribution precision.
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 proposed carrier solution achieves stable toner consumption and uniform image production over long periods, reducing the ghost phenomenon and enhancing color reproducibility by maintaining consistent toner distribution and charge stability.
Implementation Method 1
a core material; and a coated layer covering the core material... maintaining consistent toner distribution and charge stability
Data Source
AI summary
A carrier for developing electrostatic latent image, including a core material; and a coated layer covering the core material, including a binder resin and a particulate material, wherein the core material is exposed on the surface of the carrier at an areal ratio of from 0.1 to 5.0% and has the largest exposed part having an areal ratio not greater than 0.03%, and wherein the coated layer comprises the particulate material in an amount of from 100 to 500 parts by weight per 100 parts by weight of the binder resin.