Alternating Voltage Toner Discharge for Fog Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming apparatuses face inefficiencies in consuming oppositely charged toner, leading to image defects like fog and irregularities, as they often discharge both normally and oppositely charged toner simultaneously, resulting in high costs and low effectiveness.
Innovation Solution
An image forming apparatus that applies an alternating voltage with a development phase and a recovery phase to the development roller, setting the development duty and frequency to efficiently consume only the oppositely charged toner by ensuring the normally charged toner beats out and flies the oppositely charged toner to the photoreceptor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compulsorily discharge toner on the development roller to consume oppositely charged toner, then image defects such as fog and irregularities are prevented, but a large amount of normally charged toner is simultaneously discharged reducing cost-effectiveness
Solution Approach 1:
The patent segments the toner discharge process into two distinct phases: a development phase where normally charged toner is discharged to the photoreceptor, and a recovery phase where oppositely charged toner is discharged back to the development roller. This temporal segmentation allows selective consumption of oppositely charged toner without wasting normally charged toner, resolving the contradiction between preventing image defects and maintaining cost-effectiveness.
Solution Approach 2:
The patent applies periodic alternating voltage to the development roller, creating cyclic development and recovery phases. During the development phase, normally charged toner is discharged; during the recovery phase, oppositely charged toner is discharged. This periodic action enables continuous selective consumption of oppositely charged toner while preserving normally charged toner for productive development operations.
2Loss of substance
If apply high voltage to fly oppositely charged toner to photoreceptor, then toner consumption increases, but adhesion force prevents toner from flying effectively
Solution Approach 1:
The patent uses periodic alternating voltage to create cyclic development and recovery phases. During the recovery phase, when the development roller is positively charged, oppositely charged toner is attracted and discharged to the photoreceptor. This periodic voltage application overcomes the adhesion force effectively, enabling consistent toner consumption without requiring continuously high voltage.
Solution Approach 2:
The patent ensures continuous useful action by maintaining the development roller in a state ready for the next development cycle. The recovery phase continuously consumes oppositely charged toner, and the development roller is continuously prepared for the next development phase, ensuring uninterrupted productive operation and consistent toner management.
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 allows for efficient consumption of oppositely charged toner, preventing image defects and improving cost-effectiveness by selectively targeting and removing only the oppositely charged toner.
Implementation Method 1
a force from the development roller toward the photoreceptor by the development voltage
Implementation Method 2
the toner is drawn back from the photoreceptor toward the development roller by the recovery voltage
Implementation Method 3
a Coulomb force to fly the positively charged toner on the photoreceptor onto the photoreceptor
Data Source
AI summary
A potential difference between the photoreceptor and the development roller is set at a value at which the normally charged toner on the development roller can be flown toward the photoreceptor in the development phase at the time of compulsorily consuming the toner, and this potential difference is set at a value at which the flown normally charged toner can be returned to the development roller in the recovery phase.