Image Forming Device White Toner Fogging Control
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Solution Overview
Problem
Conventional image forming devices experience deterioration in image quality when using white toner, particularly due to the unique electrical characteristics of white toner, which leads to increased conductivity and difficulty in charging, resulting in 'fogging' or blurring effects.
Innovation Solution
The image forming device employs a control system that adjusts the developing potential difference for white toner to be smaller than that of other colors, using a specific configuration of developing devices and control parts to manage voltages and toner supply, thereby reducing the occurrence of 'fogging' and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a white developer is used for image formation on translucent print media, then image formation capability is improved, but image quality deteriorates due to fogging and blurring
Solution Approach 1:
The patent applies parameter changes by adjusting the developing potential difference specifically for white toner to be lower than for other colors. This modifies the electrical parameters of the developing process to account for the unique properties of white toner, reducing fogging while maintaining image formation capability on translucent media
Solution Approach 2:
The patent implements local quality by applying different developing potential differences to different toner colors. White toner receives a lower developing potential difference compared to colored toners, creating a differentiated development process that optimizes image quality for each toner type based on its specific characteristics
2Speed
If a larger developing potential difference is applied to white toner, then development speed is improved, but fogging increases and image quality deteriorates
Solution Approach 1:
The patent changes the electrical parameter (developing potential difference) for white toner development, setting it lower than for colored toners. This parameter adjustment prevents excessive toner attachment and fogging while maintaining adequate development speed for white toner's higher conductivity characteristics
3Device complexity
If the same developing potential difference is used for all toner colors, then device complexity is reduced, but image quality deteriorates due to white toner characteristics
Solution Approach 1:
The patent implements local quality through differentiated control of developing potential differences for different toner colors. The control unit adjusts electrical parameters specifically for white toner based on its unique properties, achieving optimized image quality without requiring complex hardware modifications
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the developing potential difference based on toner color characteristics. The control unit modifies electrical parameters for white toner development, creating an adaptive control system that maintains image quality while managing device complexity through software-based parameter adjustment
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 effectively reduces the color difference and 'fogging' associated with white toner, enhancing overall printing quality and stability, even when printing on high-resistance media like OHP films, while minimizing toner consumption.
Implementation Method 1
a charging part charging the image carrying part
Implementation Method 2
a developing part on which a developing voltage is applied and which attaches developer to the image carrying part to develop the electrostatic latent image
Data Source
AI summary
An image forming device includes each of developing devices including an image carrying part, a charging part that charges the image carrying part, a developing part on which a developing voltage is applied and which attaches developer to the image carrying part to develop the electrostatic latent image, and a control part that controls each of the developing devices. The developers are a white developer and other color developers, one of the developing devices using the white developer being defined the white developing device, the others using the other color developers being defined the non-white developing devices, and a developing potential difference of the white developing device is smaller than other developing potential differences of the non-white developing devices, the developing potential difference being defined between the developing voltage and potential of the image carrying part of the each developing device.