Image Forming Apparatus Gradation Correction Stopping Time
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Solution Overview
Problem
Users often falsely recognize gradation correction in image forming apparatuses as color deviation, leading to instability in image quality perception, especially during automatic correction processes.
Innovation Solution
An image forming apparatus that includes a developer carrying member, an image forming unit, a detecting unit, and a correcting unit to measure the stopping time period of the developer carrying member and adjust image formation conditions based on feedback, using a correction coefficient to control the gradation correction amount and prevent misperception of color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic gradation correction is performed to stabilize image quality, then image quality stability is improved, but users falsely recognize the correction as color deviation
Solution Approach 1:
The system performs preliminary measurement of the uncontrolled time period (stopping time) of the developer carrying member before executing gradation correction. Based on this pre-measured time information, the system determines appropriate correction coefficients in advance, allowing the correction process to account for environmental stabilization needs and prevent user misperception of color deviation.
Solution Approach 2:
The system changes the correction parameters (correction coefficients) based on the measured uncontrolled time period. When the stopping time exceeds a threshold, different correction coefficients are applied compared to when it does not, allowing the correction amount to be dynamically adjusted according to environmental conditions, thereby preventing false color deviation recognition.
2Manufacturing precision
If gradation correction amount is increased to achieve target density, then image density accuracy is improved, but user perception of color stability deteriorates
Solution Approach 1:
The system dynamically adjusts the correction amount by changing correction coefficients based on the uncontrolled time period. This allows the correction strength to be modulated - larger corrections when environmental conditions are stable (long stopping time) and smaller corrections when conditions are unstable (short stopping time) - thereby achieving accurate density while maintaining perceived color stability.
Solution Approach 2:
The system uses feedback from the uncontrolled time period measurement to determine appropriate correction coefficients. The measured stopping time provides feedback about environmental stability, which is then used to adjust the correction amount, creating a closed-loop system that balances density accuracy with color perception stability.
Data Source
AI summary
An image forming apparatus includes a measuring unit configured to measure a stopping time period in which rotation of a developer carrying member is stopped; a correcting unit configured to control an image forming unit to form a pattern image, control a detecting unit to detect the pattern image, and correct an image formation condition of the image forming unit based on a detection result of the detecting unit; and a correcting unit configured to correct a correction amount of the image formation condition, which is corrected by the correcting unit, based on the stopping time period measured by the measuring unit.