Dynamic Reference Position Adjustment for Image Registration
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Solution Overview
Problem
Existing image forming apparatuses face challenges in correcting image formation due to angle differences between the sub-scanning direction of the image forming unit and the conveyance direction of the belt, leading to image formation issues such as deviations and inaccuracies.
Innovation Solution
The apparatus includes a detection unit to identify marks on the conveyance member, and a change unit that adjusts the printing reference position and mark reference position based on the angle difference, ensuring accurate image formation by increasing the offset between these positions as the angle difference grows, thereby compensating for deviations in the main scanning direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If registration is performed to correct image forming positions, then image forming position accuracy is improved, but the problem of angle difference between sub-scanning direction and conveyance direction cannot be solved
Solution Approach 1:
The patent introduces a dynamic correction mechanism that adjusts the mark reference position based on the detected angle difference. The control unit dynamically changes the mark reference position in the main scanning direction according to the angle difference between the sub-scanning direction and conveyance direction, allowing the system to adapt to varying angular conditions while maintaining image forming accuracy.
Solution Approach 2:
The patent changes the parameter of mark reference position based on the angle difference. By detecting the angle difference and using it to adjust the mark reference position, the system transforms the angular deviation into a positional correction, thereby compensating for the angle difference effect on image forming accuracy.
2Device complexity
If the mark reference position is fixed, then the device complexity is reduced, but image formation problems occur due to angle difference
Solution Approach 1:
The patent implements a feedback mechanism where the angle difference is detected and used to adjust the mark reference position. The control unit receives the angle difference information and feeds it back into the position correction system, creating a closed-loop control that maintains image formation accuracy despite angular variations.
Solution Approach 2:
The system uses its own detection capabilities to correct its own positioning errors. By detecting the angle difference and automatically adjusting the mark reference position, the system performs self-correction without requiring external intervention or complex additional hardware.
3Object-affected harmful factors
If offset amount between printing reference position and mark reference position is increased, then angle difference impact is reduced, but mark detection precision may be affected
Solution Approach 1:
The patent applies a partial correction by adjusting the mark reference position based on the detected angle difference. The correction amount is calculated to partially compensate for the angular effect, providing sufficient correction to maintain accuracy without over-correcting, thereby balancing image formation accuracy with mark detection precision.
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 solution effectively suppresses image formation problems caused by angle differences, improving printing accuracy and mark detection precision by dynamically adjusting reference positions in response to angle deviations, without requiring dedicated angle sensors.
Implementation Method 1
an optical sensor having a light emission unit and a light reception unit, illuminates light on the belt by the light emission unit and receives the reflected light in the light reception unit
Data Source
AI summary
An image forming apparatus includes: a conveyance member; a detection unit which outputs a detection signal according to a mark for image formation condition correction; an image forming unit which forms a print image and the mark; and a change unit which changes at least one of a printing reference position and a mark reference position such that an offset amount between the printing reference position and the mark reference position becomes larger as an angle difference between a sub-scanning direction and a conveyance direction of the conveyance member is larger, wherein the printing reference position is a basis of determining a formation position of the print image in a main scanning direction and the mark reference position is a basis of determining at least one of a formation position and a size of the mark in the main scanning direction.