Image Forming Apparatus Color Misregistration Correction
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Solution Overview
Problem
Existing image forming apparatuses face significant errors in detecting color misregistration when temperature fluctuations occur rapidly, leading to inaccuracies in correcting image positions during the formation of color images, as the difference between temperature increase and decrease estimation values results in substantial errors in correction values.
Innovation Solution
The apparatus employs a controller that uses distinct determination conditions based on temperature changes to accurately estimate and correct color misregistration, employing different estimation expressions for temperature increases and decreases, and adjusts image formation positions accordingly using sensors and temperature data from the exposure and developing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single estimation table is used for color misregistration detection, then the device complexity is reduced, but the measurement precision deteriorates when temperature fluctuates rapidly between increase and decrease
Solution Approach 1:
The patent implements dynamic switching between different estimation tables (first estimation table for temperature increase, second estimation table for temperature decrease) based on the current temperature trend. The controller determines whether to switch tables by comparing current temperature with previous temperature readings, enabling the system to adapt to changing thermal conditions and maintain high measurement precision without excessive complexity
Solution Approach 2:
The patent changes the estimation parameters by selecting different estimation tables based on temperature direction (increase or decrease). Each table contains pre-stored color misregistration amounts corresponding to different temperature conditions. By switching tables according to temperature trends, the system optimizes measurement precision for rapidly fluctuating temperatures while managing device complexity through structured parameter organization
2Productivity
If temperature-based estimation is used for color misregistration detection, then the productivity is improved by avoiding pattern image formation, but the measurement precision deteriorates during rapid temperature fluctuations
Solution Approach 1:
The patent dynamically selects between different estimation approaches by switching estimation tables based on temperature trends. When temperature is increasing, the first estimation table is used; when temperature is decreasing, the second estimation table is used. This dynamic adaptation maintains high measurement precision during rapid temperature fluctuations while preserving the productivity benefits of temperature-based estimation over pattern image formation
Solution Approach 2:
The patent incorporates feedback mechanisms by continuously monitoring temperature changes and using this information to select appropriate estimation tables. The controller reads temperature data, determines the temperature trend (increase or decrease), and switches estimation tables accordingly. This feedback loop ensures accurate color misregistration detection during rapid temperature fluctuations while maintaining high productivity through temperature-based estimation
3Measurement precision
If multiple estimation tables are switched based on temperature trends, then the measurement precision is improved, but the device complexity increases due to table switching logic
Solution Approach 1:
The patent implements a dynamic table switching mechanism controlled by simple temperature comparison logic. The controller reads the current temperature and previous temperature, determines whether temperature is increasing or decreasing, and switches between the first and second estimation tables accordingly. This dynamic approach maintains high measurement precision while managing device complexity through straightforward switching logic based on temperature trends
Solution Approach 2:
The patent organizes estimation parameters into two distinct tables (first estimation table for temperature increase, second estimation table for temperature decrease), each containing pre-calculated color misregistration amounts for different temperature conditions. By changing which table is active based on temperature direction, the system achieves high measurement precision while managing complexity through structured parameter organization and clear switching criteria
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 significantly reduces detection errors in color misregistration, ensuring high accuracy in image formation even during rapid temperature fluctuations, by using specific estimation expressions for temperature increases and decreases, thereby improving the precision of image position correction.
Implementation Method 1
The heat may cause deformation or positional changes of the optical components in the scanning optical device. Such changes may cause changes of an irradiation position of the photosensitive member.
Implementation Method 2
a scanning optical device configured to expose the photosensitive member with light in order to form an electrostatic latent image on the photosensitive member
Data Source
AI summary
An image forming apparatus is configured to calculate an estimated value of a color misregistration amount based on a first estimation expression when a temperature of an exposure device is under a temperature increasing state. The image forming apparatus is configured to calculate the estimated value of the color misregistration amount based on the first estimation expression when the temperature of the exposure device is under the temperature decreasing state and the exposure device is not in a thermally-deformed state. The image forming apparatus is configured to calculate the estimated value of the color misregistration amount based on a second estimation expression when the temperature of the exposure device is in the temperature decreasing state and the exposure device is in the thermally-deformed state. The image forming apparatus is configured to correct color misregistration based on the calculated estimated value.