Composite Toner for Stable High-Resolution Imaging
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Solution Overview
Problem
Existing electrophotographic methods face challenges in achieving high-resolution, high-definition images stably over time due to issues like uneven toner application, mechanical stress, and peeling discharge phenomena, which affect image quality and durability of electrophotographic constituents.
Innovation Solution
A developer comprising toner particles with a binder resin and a composite inorganic fine powder of strontium titanate, strontium carbonate, and titanium oxide, optimized for uniform charging and mechanical stability, is used to form a stable electrostatic latent image, reducing defects like stripe-like density reductions and fogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If print speed is increased, then productivity is improved, but mechanical stress on the developing roller and blade increases causing uneven toner application
Solution Approach 1:
The patent changes the physical parameters of the toner particles by incorporating specific inorganic particles (silica fine particles with 0.1-1.0 μm diameter, titanium oxide particles with 0.03-0.5 μm diameter) to modify the toner's mechanical properties. This allows the toner to maintain uniform application characteristics even under high-speed printing conditions with increased mechanical stress
Solution Approach 2:
The patent creates a composite toner material by combining organic binder resin with inorganic particles (silica and titanium oxide). This composite structure provides both the necessary mechanical strength to withstand high-speed developing operations and the surface properties required for uniform toner application and charging stability
2Productivity
If shear force in the developing unit is increased, then productivity is improved, but developer deterioration occurs causing image quality reduction and fogging
Solution Approach 1:
The patent modifies the toner's mechanical properties by incorporating inorganic particles with specific size ranges and hardness characteristics. The silica particles (0.1-1.0 μm) and titanium oxide particles (0.03-0.5 μm) provide enhanced mechanical strength and controlled shear resistance, allowing the toner to withstand high-speed developing operations without deterioration while preventing fogging and maintaining image quality
3Reliability
If magnetic particles are incorporated into toner to prevent scattering, then reliability is improved, but it becomes difficult to apply developer uniformly due to magnetic binding force and increased specific gravity
Solution Approach 1:
The patent creates a composite toner structure combining magnetic particles for scattering prevention with inorganic particles (silica and titanium oxide) that provide mechanical strength and control magnetic aggregation. This multi-component composite allows the toner to maintain uniform application characteristics while preventing unwanted scattering during the developing process
4Ease of operation
If fine inorganic particles are added to improve fluidity, then ease of operation is improved, but charging stability deteriorates under mechanical stress
Solution Approach 1:
The patent combines different types of inorganic particles (silica fine particles for fluidity improvement and titanium oxide particles for charging stability) in specific size ranges and proportions. This composite approach allows the toner to maintain both good fluidity for easy handling and stable charging characteristics that resist deterioration under mechanical stress during high-speed operation
Solution Approach 2:
The patent optimizes the size parameters of inorganic particles (silica: 0.1-1.0 μm, titanium oxide: 0.03-0.5 μm) to achieve a balance between fluidity and charging stability. The specific size ranges ensure sufficient surface area for charging while maintaining particle dispersion and fluidity, preventing both aggregation and charging deterioration under stress
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 enables the stable production of high-resolution, high-definition images over a long period by ensuring uniform toner application and resistance to mechanical stress, while also mitigating peeling discharge phenomena, thus enhancing image quality and extending the lifespan of electrophotographic components.
Implementation Method 1
applying charge to toner particles by means of friction between a layer thickness regulating member (which may hereinafter be referred to as 'blade') and the developer and friction between a developer carrier (which may hereinafter be referred to as 'developing roller') and the developer
Implementation Method 2
utilizing a photoconductive substance first to form an electrostatic latent image on an image bearing member (photosensitive member) by various means
Data Source
AI summary
To provide a developer and an image forming method with each of which a high-resolution, high-definition image can be stably obtained over a long time period irrespective of an environment. The present invention provides a developer including at least: toner particles each containing at least a binder resin; and a composite inorganic fine powder, the developer being characterized in that: the composite inorganic fine powder has a peak at a Bragg angle (2θ±0.20 deg) of each of 32.20 deg, 25.80 deg, and 27.50 deg in a CuKα characteristic X-ray diffraction pattern; and the half width of the X-ray diffraction peak at a Bragg angle (2θ±0.20 deg) of 32.20 deg is 0.20 to 0.30 deg.