Two-Carrier Developer Coating Ratio for Filming Suppression
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Solution Overview
Problem
Existing electrostatic charge image forming technologies experience filming on the surface of image holding members in tandem-type image forming apparatuses due to the migration of carriers, leading to inadequate cleaning and surface degradation.
Innovation Solution
A developer set comprising two-component developers with specific ratios of inorganic particles in their resin coating layers, where the element ratio A(1)/A(2) is controlled between 17 and 105, allowing selective migration and polishing action of carriers to prevent filming on downstream image holding members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carriers are used in electrostatic charge image forming, then image development is achieved, but filming occurs on the surface of downstream image holding members due to carrier migration
Solution Approach 1:
The patent applies local quality by creating asymmetric carrier properties: carrier (1) contains inorganic particles in its resin coating layer while carrier (2) does not. This local differentiation enables carrier (1) to migrate to downstream image holding members for cleaning, while carrier (2) performs primary development, resolving the filming problem through specialized local functions.
Solution Approach 2:
The patent changes the compositional parameter of the carrier by controlling the element ratio of inorganic particles. Specifically, the ratio of the element ratio of inorganic particles on carrier (1) surface to that on carrier (2) surface is maintained between 17 and 105, creating sufficient property difference to drive selective migration and prevent filming.
2Object-generated harmful factors
If carrier migration is prevented, then filming is suppressed, but cleaning ability on image holding members deteriorates
Solution Approach 1:
The patent implements self-service by enabling carrier (1) to automatically migrate to downstream image holding members and perform cleaning through its unique inorganic particle composition. The carriers self-organize based on their property differences, with carrier (1) naturally migrating to where it is needed for cleaning without external intervention.
Solution Approach 2:
The patent segments the carrier population into two distinct types with different compositions and functions. Carrier (1) with inorganic particles handles cleaning through migration, while carrier (2) without inorganic particles handles primary development, allowing each segment to perform its specialized function effectively.
3Ease of operation
If inorganic particles are added to carrier resin coating layer, then selective migration is enabled, but carrier complexity increases
Solution Approach 1:
The patent controls complexity by precisely defining a numerical parameter range for the inorganic particle element ratio (17-105). This quantitative specification provides a clear control criterion for achieving selective migration, transforming a complex material science problem into a manageable parameter optimization task.
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 developer set effectively suppresses filming on downstream image holding members by utilizing the difference in surface energy between carriers, ensuring efficient cleaning and prolonged apparatus performance.
Implementation Method 1
utilizing the difference in surface energy between carriers
Implementation Method 2
polishing action of carriers to prevent filming
Data Source
AI summary
An electrostatic charge image developer set includes a developer (1) and a developer (2) each containing a toner and a carrier, in which a carrier (1) of the developer (1) includes magnetic particles, a resin coating layer that covers the magnetic particles, and inorganic particles contained in the resin coating layer, a carrier (2) of the developer (2) includes magnetic particles and a resin coating layer that covers the magnetic particles, and a value of A(1)/A(2) is 17 or more and 105 or less, where when an element ratio of a metal and a semimetal that constitute the inorganic particles of the carrier (1) is analyzed by X-ray photoelectron spectroscopy for each of the carrier (1) and the carrier (2), an element ratio on a surface of the carrier (1) is denoted as A(1) and an element ratio on a surface of the carrier (2) is denoted as A(2).