Dynamic Fixing Temperature Control for Image Forming Apparatus
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Solution Overview
Problem
Current image forming apparatuses face inefficiencies in acquiring density information from image data quickly, leading to excessive fixing temperatures and issues like hot offset and curling, especially when dealing with varying amounts of toner, as they often require fixed settings regardless of toner quantity.
Innovation Solution
The apparatus divides pixel data into areas formed by a predetermined number of pixels, acquiring density information as representative values to set optimal fixing conditions based on the maximum values, allowing for dynamic adjustment of fixing temperatures according to the acquired data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed fixing conditions are used to ensure maximum toner loading can be fixed, then all images can be fixed, but images with small amount of toner are fixed at excessive temperature causing hot offset, curling, and power consumption
Solution Approach 1:
The fixing temperature is made dynamic by calculating image density from pixel data and adjusting the fixing temperature according to the actual toner amount. The control unit varies the fixing temperature based on density information extracted from the image data, transitioning from fixed to adaptive temperature control.
Solution Approach 2:
The fixing temperature parameter is changed based on the calculated image density. The control unit determines the fixing temperature by referencing a lookup table or calculation formula that maps density values to appropriate temperature settings, allowing the temperature parameter to adapt to different imaging conditions.
2Ease of operation
If fixed fixing conditions are used for all images, then the fixing process is simple, but the time required to acquire density information increases when processing high-resolution images
Solution Approach 1:
The image data is segmented into multiple regions or blocks of pixel data. The control unit calculates density information for each segment and determines the maximum density value across all segments to set the fixing temperature. This segmentation approach reduces processing time compared to analyzing every pixel individually.
Solution Approach 2:
Instead of processing all pixel data in detail, the control unit samples density information from representative portions of the image data. By calculating density for a subset of pixels or using downscaled image data, the system obtains sufficient density information faster without requiring full-resolution processing.
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 reduces the time required to acquire density information, enables energy savings, and prevents hot offset and curling by ensuring proper fixability, even at high resolutions and speeds, while maintaining image quality.
Implementation Method 1
a fixing section that fixes the toner image to the recording material by heating the recording material on which the toner image is formed
Data Source
AI summary
An image forming apparatus includes an image forming unit, an acquisition unit, a fixing unit including a heating member and a pressure member forming a nip, a temperature detecting unit, and a control unit. In a case where a toner density of a toner image on a k-th recording material of a plurality of recording materials is less than the toner density of the toner image on a (k-1)-th recording material of the plurality of recording materials, k being an integer greater than or equal to two, the control unit sets a fixing temperature of the k-th recording material to a temperature which is greater than a predetermined temperature predetermined based on image information of the toner image to be formed on the k-th recording material.