Dynamic Fixing Temperature Control for Image Density
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in maintaining optimal fixing temperatures for images with varying toner densities and lengths, leading to inefficient energy use and improper fixing, especially during double-sided printing.
Innovation Solution
An image forming apparatus with a control unit that analyzes pixel density along the circumferential length of the heat transfer member and adjusts the target temperature accordingly, ensuring effective fixing while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixing temperature is set high to ensure proper fixing for images with long high-density patterns, then the fixing property is improved, but electrical power consumption increases
Solution Approach 1:
The fixing temperature is made dynamic rather than static. The control unit adjusts the fixing temperature based on real-time analysis of image data, specifically detecting high-density pixel regions and their positions relative to the heat transfer member's rotation. This allows the temperature to adapt to varying image patterns, ensuring proper fixing only when needed while reducing energy consumption for images that don't require high temperatures.
Solution Approach 2:
The patent changes the temperature parameter dynamically based on image characteristics. By analyzing the density and distribution of pixels in the image data, the system adjusts the fixing temperature parameter to match the actual thermal requirements of different image patterns, rather than using a fixed high temperature for all cases.
2Use of energy by moving object
If the fixing temperature is set low to reduce electrical power consumption, then energy efficiency is improved, but fixing property deteriorates for images with high print ratio
Solution Approach 1:
The system dynamically adjusts temperature based on detected image characteristics. When high-density pixel regions are detected that correspond to high print ratio patterns, the temperature increases to ensure proper fixing. When such regions are absent, the system maintains lower temperature settings, reducing energy consumption while preserving fixing quality where needed.
Solution Approach 2:
The fixing temperature parameter is changed according to the detected pixel density characteristics. The control unit compares the analyzed pixel distribution against thresholds and adjusts the temperature parameter accordingly, allowing the system to optimize between energy consumption and fixing performance based on the actual image content.
3Productivity
If the thermal capacity of the elastic layer is decreased to shorten wait time, then productivity is improved, but fixing temperature for the second side of recording material is affected by toner amount on the first side
Solution Approach 1:
The control unit performs preliminary analysis of image data before the fixing process begins. By detecting high-density pixel regions and calculating their positions in advance, the system can pre-adjust the fixing temperature settings, ensuring that when double-sided printing occurs, the temperature is already optimized for the second side regardless of the first side's toner content.
Solution Approach 2:
The system uses feedback from image data analysis to adjust fixing parameters. The control unit continuously monitors image characteristics and uses this information to modulate the fixing temperature, ensuring that thermal capacity limitations don't interfere with fixing quality on the second side during rapid sequential printing.
4Reliability
If the length of image pattern with high print ratio is increased to improve fixing property, then fixing quality is improved, but film transfer material decreases due to heat absorption
Solution Approach 1:
Instead of applying uniform high temperature across the entire film surface, the system applies heat locally and selectively. By analyzing the position and density of pixels in the image data, the control unit adjusts temperature in specific regions corresponding to high-density patterns, concentrating thermal energy where it is most needed for fixing while minimizing overall heat absorption from the film.
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 ensures good fixing properties across different image patterns while reducing electrical power consumption by optimizing the control temperature based on pixel density analysis, thereby achieving energy savings.
Implementation Method 1
a heater including a heat generating resistor for generating heat by energization
Implementation Method 2
a cylindrical film rotating in contact with an inner peripheral surface of the heater... the recording material, on which an unfixed toner image is formed by the image forming portion, is fed and heated in the nip
Data Source
AI summary
An image forming apparatus includes an image forming portion that forms an image on a recording material, and a fixing portion including a cylindrical heat transfer member, and a heating member contacting an inner surface of the heat transfer member. The fixing portion fixes the image on the recording material by heating the recording material, on which the image has been formed, by heat from the heating member through the heat transfer member. A control unit controls a target temperature of the heating member, and analyzes whether or not a plurality of pixels, of image data corresponding to the image to be formed on the recording material, in each interval corresponding to a circumferential length of the heat transfer member, with respect to a recording material feeding direction, are pixels for forming an image with a predetermined density or more, and sets the target temperature depending on an analyzation result.