Photoconductor Drum Carrier Adhesion for Stable Toner Transfer
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Solution Overview
Problem
Existing image forming apparatuses face challenges in achieving high transfer efficiency without a cleaning system, leading to issues like white patches, image streaks, and reduced fixability due to fluctuations in rotation and excessive fine particles, especially on high-brightness papers.
Innovation Solution
The apparatus supplies a sufficient amount of carrier particles to the photoconductor drum surface, ensuring a specific adhesion balance between carrier and toner particles, and between carrier and drum, to stabilize rotation and improve transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fine particles are supplied from a developing device to the photoconductor drum by using toner to which fine particles are externally added, then transfer efficiency is improved, but adhesion between fine particles and toner becomes excessive causing image quality degradation
Solution Approach 1:
The patent extracts fine particles from toner by using a cleaning device to remove fine particles from the photoconductor drum surface. This separation allows the toner to maintain its primary function while fine particles are controlled and removed, resolving the contradiction between using fine particles for transfer efficiency and removing them for image quality.
Solution Approach 2:
The patent introduces a cleaning device as an intermediary between the developing device and the photoconductor drum. This intermediary component controls the interaction between fine particles and the photoconductor surface, enabling precise management of fine particle adhesion to achieve both good transfer efficiency and image quality.
2Manufacturing precision
If a cleaning system is equipped to remove residual toner, then image quality is maintained, but apparatus size increases
Solution Approach 1:
The cleaning device is designed to perform multiple functions: it removes residual toner to maintain image quality, controls fine particle adhesion to optimize transfer efficiency, and prevents excessive fine particle accumulation. This multi-functionality allows a single compact component to replace what would otherwise require multiple separate systems.
Solution Approach 2:
The patent combines the cleaning function with fine particle control in a single integrated cleaning device. By merging these functions, the apparatus avoids the need for separate cleaning systems and fine particle management devices, thereby reducing overall apparatus size while maintaining image quality.
3Productivity
If peripheral speed difference is actively provided between photoconductor drum and intermediate transfer belt, then primary transfer efficiency is increased, but rapid fluctuations in rotation occur causing image streaks
Solution Approach 1:
The patent employs feedback control to monitor and adjust the rotation speeds of the photoconductor drum and intermediate transfer belt. By using feedback, the system can maintain the necessary peripheral speed difference for high transfer efficiency while actively compensating for rapid fluctuations to prevent image streaks, thus resolving the contradiction between efficiency and stability.
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
This approach enhances transfer efficiency, stabilizes process member rotation, and maintains image quality on various paper types by reducing adverse effects from fine particles, thus improving overall image formation.
Implementation Method 1
the developing member is configured to contact with the image bearing member to form a developing portion and to supply the developer to a surface of the image bearing member
Implementation Method 2
a specific adhesion balance between carrier and toner particles, and between carrier and drum
Implementation Method 3
applies a voltage from a voltage source to a transfer member disposed in an area opposite a photoconductor drum serving as an image bearing member to electrostatically transfer a toner image
Data Source
AI summary
An image forming apparatus includes a rotatable image bearing member and a rotatable developing member to carry developer made up of toner particles and carrier particles adhered to surfaces of the toner particles. Where a pressing force pressing the developing member against the image bearing member is F1, a total number of the carrier particles interposed between the toner particles and the image bearing member is N1, and an adhesion Ft between a carrier particle and a toner particle, measured when the carrier particle is pressed against the toner particle with F1/N1 that is a pressing force per unit carrier particle, and an adhesion Fdr1 between the carrier particle and the image bearing member, measured when the carrier particle is pressed against the image bearing member with F1/N1, satisfy Ft≤Fdr1.