Hybrid Development Apparatus Toner Carrier Voltage Control
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Solution Overview
Problem
In hybrid development methods with multiple toner carriers, controlling toner supply independently of development electric fields is challenging, leading to uneven toner distribution and reduced image quality, especially at high speeds.
Innovation Solution
A development apparatus with a power supply that applies different alternating current voltage components to each toner carrier and the developer carrier, adjusting the duration and amplitude of these voltages to independently control toner supply and transfer capabilities, ensuring optimal toner distribution and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple toner carriers are used to increase development time, then image density is improved, but toner supply control becomes difficult and image quality becomes uneven
Solution Approach 1:
The patent applies parameter changes by independently controlling the alternating current voltage parameters (amplitude, frequency, phase) for each toner carrier. This allows precise adjustment of toner supply amounts to different carriers, ensuring uniform image density across multiple carriers while avoiding the complexity of mechanical adjustment mechanisms.
2Productivity
If alternating current voltage is applied to increase toner flying distance, then image density is improved, but toner supply to individual carriers becomes unbalanced
Solution Approach 1:
The patent implements local quality by applying different alternating current voltage characteristics to each toner carrier based on its specific position and toner supply requirements. Each carrier receives customized voltage parameters, ensuring balanced toner distribution while maintaining high image formation speed through optimized toner flying distance for each local region.
3Manufacturing precision
If development electric field is increased to improve development capability, then image quality is improved, but toner supply from developer carrier becomes insufficient
Solution Approach 1:
The patent applies preliminary action by adjusting the alternating current voltage parameters of toner carriers before the development process to pre-optimize toner supply amounts. This ensures that each toner carrier has the appropriate toner quantity ready, allowing the development electric field to be increased for high image quality without causing toner supply insufficiency.
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 independent control of toner supply to each toner carrier, enhancing development capabilities and maintaining high image quality even at high speeds by modifying the toner supply electric fields without affecting the development electric fields.
Implementation Method 1
a power supply means for supplying a first voltage having a first alternating current component to the first toner carrier, for supplying a second voltage having a second alternating current component to the second toner carrier, and for supplying a developer carrier bias voltage having a third alternating current component to the developer carrier
Data Source
AI summary
Provided are a development apparatus and an image forming apparatus which, in a hybrid development apparatus provided with a plurality of toner carriers, a toner supply capability to supply toner to each toner carrier is controlled independent of development electric fields between the toner carriers and an image carrier, whereby each toner carrier is allowed to exhibit a desired development capability, and even in the case of high speed development, a high quality image is provided. The phases, the frequencies, and/or the duty ratios of the alternating current components of the voltages applied to the plurality of the toner carriers are made to be different, whereby the toner supply amount for each toner carrier from the developer carrier is controlled independently of the development electric fields between the toner carriers and the image carrier.