Dynamic Fixing Temperature Control for Electrophotographic Printers
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in efficiently controlling fixing temperature based on the type of gradation processing and drawing area, leading to excessive power consumption due to presetting high temperatures to prevent issues like cold offset.
Innovation Solution
An image forming apparatus and method that utilize an image-formation-attribute processing unit to analyze print data, determine the type of gradation processing, and adjust the fixing temperature accordingly using an attribute-value table to optimize temperature control based on gradation processing and drawing areas, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the preset temperature is set to a high temperature to prevent cold offset, then the reliability of fixing is improved, but the power consumption increases
Solution Approach 1:
The patent changes the fixing temperature parameter dynamically based on the image type (text vs. photograph) and gradation processing method. For text images with small gradation areas, a lower temperature is used, while for photographs or images with large gradation areas, a higher temperature is applied. This parameter adaptation resolves the contradiction by matching temperature to actual fixing needs rather than using a uniformly high temperature.
Solution Approach 2:
The fixing temperature is made dynamic rather than static. The control unit adjusts the temperature in real-time based on analysis of the image data characteristics. This dynamic adjustment allows the system to maintain high reliability when needed (photographs, large gradation areas) while reducing power consumption when full temperature is not required (text images with small gradation areas).
2Ease of operation
If the preset temperature is set uniformly regardless of image type, then the ease of operation is improved, but the power consumption increases
Solution Approach 1:
The system performs self-service by automatically analyzing the image data characteristics and determining the appropriate fixing temperature without user intervention. The control unit extracts image type information and gradation processing details from the print data, then autonomously selects the optimal temperature setting. This maintains ease of operation while eliminating wasteful power consumption through intelligent automation.
Solution Approach 2:
The patent implements parameter changes based on image characteristics analysis. The control unit modifies the fixing temperature parameter according to the detected image type (text/photograph) and gradation processing method. This automated parameter adaptation resolves the contradiction by making the system both simple to operate (automatic adjustment) and energy-efficient (appropriate temperature selection).
3Reliability
If the preset temperature is increased to account for usage environment changes and component temporal changes, then the reliability is improved, but the power consumption increases
Solution Approach 1:
The patent applies parameter changes based on actual image requirements rather than adding a uniform temperature offset to compensate for environmental and component variations. By analyzing the specific image characteristics (image type, gradation processing area ratio), the system determines the minimum necessary temperature, thus avoiding unnecessary power consumption while maintaining reliability through targeted temperature control.
Solution Approach 2:
The system dynamically adjusts temperature based on real-time image analysis rather than using a statically high temperature setting. This dynamic approach allows the fixing unit to maintain reliability for images that require it while reducing power consumption for images that can be fixed at lower temperatures, even when accounting for environmental and component variations.
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 more efficient control of fixing temperature, reducing unnecessary power consumption by tailoring the temperature settings to specific gradation processing types and areas, enhancing energy conservation in electrophotographic image forming processes.
Implementation Method 1
a fixing unit, which fuses toner transferred onto a print sheet by application of heat thereby fixing the toner on the print sheet
Data Source
Figure 1
Figure 2(a)~2(d)
Figure 3(a)~3(b)
AI summary
An image forming apparatus (100) including an attribute-value-information holding unit that holds an attribute-value table showing correspondence between a type of gradation processing and a fixing-temperature control attribute value; an image-formation-attribute processing unit (114) that determines a type of gradation processing and a corresponding fixing-temperature control attribute value on the basis of contents of a print instruction and the attribute-value table; a gradation processing unit (113) that performs gradation processing in accordance with the type of gradation processing determined by the image-formation-attribute processing unit (114); and a fixing-temperature control unit (122) that controls fixing temperature in formation of a print image according to the fixing-temperature control attribute value determined by the image-formation-attribute processing unit (114).