Laser Scanning Timing Control for Color Image Stacking Accuracy
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Solution Overview
Problem
Image stacking accuracy in color laser printers is compromised by varying printing environments such as temperature and humidity, necessitating adjustments in laser scanning unit control to maintain high accuracy.
Innovation Solution
A laser scanning unit with a deflection device, optical system, and line synchronization detection unit adjusts time intervals based on detection signals to synchronize light beams scanning first and second photosensitive members, ensuring accurate color overlay by adjusting time intervals based on detected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the laser scanning unit uses fixed time intervals for scanning different photosensitive members, then the device structure is simple, but image stacking accuracy deteriorates under varying printing environments
Solution Approach 1:
The patent introduces a feedback mechanism where the controller detects the actual scanning time intervals and adjusts the exposure timing based on detected environmental variations. The controller modifies the second exposure timing according to the difference between first and second scanning time intervals, creating a closed-loop control system that maintains image stacking accuracy despite environmental changes.
Solution Approach 2:
The patent transitions from fixed time intervals to dynamic time interval adjustment. The controller dynamically modifies the second exposure timing based on real-time detection of scanning variations caused by environmental factors such as temperature and humidity changes, allowing the system to adapt to varying conditions while maintaining precision.
2Reliability
If the printer makes control adjustments to maintain image stacking accuracy under varying environments, then image stacking accuracy is maintained, but the control system complexity increases
Solution Approach 1:
The controller continuously monitors the scanning time intervals and adjusts the second exposure timing based on detected deviations. This feedback loop ensures that image stacking accuracy is maintained by compensating for environmental variations in real-time, making the system reliable under varying conditions.
Solution Approach 2:
The system performs self-adjustment by automatically detecting scanning time interval variations and correcting the exposure timing without external intervention. The controller autonomously modifies the second exposure timing based on the detected difference between first and second scanning intervals, enabling the system to maintain accuracy through self-service control.
3Manufacturing precision
If the scanning time intervals are adjusted dynamically, then image stacking accuracy is maintained under varying environments, but the processing time and complexity increase
Solution Approach 1:
The system performs preliminary detection of scanning time intervals before the actual exposure process. By detecting the first scanning time interval in advance and using this information to adjust the second exposure timing, the system prepares the correct timing parameters beforehand, minimizing processing delays during the actual imaging process.
Solution Approach 2:
The patent implements efficient timing by skipping unnecessary processing steps. The controller directly calculates the timing adjustment based on the detected scanning interval difference and applies it immediately to the second exposure, avoiding complex iterative adjustments and reducing the overall processing time while maintaining accuracy.
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
Ensures accurate color overlay in varying environments by synchronizing light beam scanning times to maintain image quality.
Implementation Method 1
a deflection device for rotating and deflecting a light beam
Implementation Method 2
the first photosensitive element is configured to sense the first light beam rotationally deflected by deflection device and generate a first detection signal
Data Source
AI summary
The disclosure provides a laser scanning unit, an image forming device and a scanning control method, where the laser scanning unit includes a deflection device, an optical system, a first light source, a second light source, a line synchronization detection unit and a controller. The controller is configured to adjust a first time interval and/or a second time interval according to a change value of a third time interval. The first time interval is a time interval between a start time of a first detection signal and a first scanning start time, the second time interval is a time interval between a start time of a second detection signal and a second scanning start time, and the third time interval is a time interval between the start time of the first detection signal and the end time of the second detection signal.