Perforated Sheet Image Formation Using Process Black Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image defects occur when forming toner images on perforated sheets due to unintended electric discharge and disordering of dot arrangements caused by burrs on the perforated regions.
Innovation Solution
The image forming apparatus replaces monochromatic black toner with a combination of cyan, magenta, and yellow toners in perforated regions to form a pseudo color image, thereby stabilizing dot arrangements and preventing image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If monochromatic black toner is used for image formation, then the image formation process is simple and fast, but image defects occur on perforated sheets due to unintended electric discharge and dot arrangement disordering
Solution Approach 1:
The patent applies different toner color combinations to different regions of the sheet. Specifically, in perforated regions where image defects occur, it uses a combination of cyan, magenta, and yellow toners instead of monochromatic black toner. This local differentiation resolves the contradiction by maintaining fast processing while preventing image defects in problematic areas.
Solution Approach 2:
The patent changes the parameter of toner color composition from monochromatic black to a combination of cyan, magenta, and yellow toners. This parameter change prevents unintended electric discharge and dot arrangement disordering in perforated regions, thereby maintaining image quality without sacrificing formation speed.
2Device complexity
If monochromatic black toner is used, then the toner composition is simple, but image defects occur due to electric discharge and burr effects on perforated sheets
Solution Approach 1:
The patent makes the toner composition region-dependent: in non-perforated regions, it uses simple monochromatic black toner, while in perforated regions, it uses a combination of cyan, magenta, and yellow toners. This local quality differentiation resolves the contradiction between simplicity and reliability.
Solution Approach 2:
The patent converts the harmful effect of unintended electric discharge in perforated regions into a beneficial outcome by using multi-color toner combinations that are less susceptible to electric discharge effects, thereby preventing image defects while maintaining overall system simplicity.
3Ease of operation
If standard toner image formation is performed on perforated sheets, then the process is straightforward, but dot arrangements become disordered and color tint changes
Solution Approach 1:
The patent applies different image formation strategies to different sheet regions. In perforated regions, it uses cyan, magenta, and yellow toner combinations that maintain stable dot arrangements despite burr effects, while in non-perforated regions, it uses standard monochromatic black toner formation. This resolves the contradiction between operational simplicity and manufacturing precision.
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 suppresses image defects by maintaining consistent color tint and dot arrangement on perforated sheets, ensuring high-quality image output.
Implementation Method 1
an image forming apparatus of an electrophotographic type
Implementation Method 2
the image processing portion performs the image processing so that black image data is formed as image data of process black with the toner of the plurality of colors
Data Source
AI summary
An image forming apparatus capable of forming an image on a perforated sheet includes an image forming portion for forming a toner image with toner of a plurality of colors, an image processing portion for performing image processing on image data acquired, and a controller for controlling the image processing portion to form the toner image on the basis of the image data processed by the image processing portion. In a case that a sheet on which the toner image is to be formed is the perforated sheet, the image processing portion performs the image processing so that black image data is formed as image data of process black with the toner of the plurality of colors by the image forming portion.