Multi-Beam Scanner Adjustment Using Segmented Marks
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Solution Overview
Problem
Existing image forming apparatuses face challenges in adjusting the electrostatic latent image forming interval between light sources due to optical and mechanical errors, leading to degraded image quality, as they require forming solid marks with light beams from the same source, which affects the positioning of electrostatic latent images formed by multiple light sources.
Innovation Solution
An image forming apparatus with a multi-beam scanning unit featuring two light sources per developing unit, a sensor, and a controller that forms specific marks with leading and trailing ends illuminated by different light sources, allowing for adjustment of the electrostatic latent image forming interval and positioning of images based on sensor signals from these marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If solid marks are formed with light beams from the same light source for adjustment, then the electrostatic latent image forming interval can be adjusted, but the positioning accuracy of electrostatic latent images formed by multiple light sources is degraded
Solution Approach 1:
The adjustment mark is segmented into multiple portions (first mark portion and second mark portion) that are formed by different light sources. This segmentation allows the mark to capture the relative position information between multiple light sources, enabling adjustment measurements that reflect the actual multi-light-source imaging conditions rather than single-source solid marks.
Solution Approach 2:
A sensor acts as an intermediary to detect the positions of mark portions formed by different light sources. The sensor provides feedback signals that enable the controller to calculate the relative positions between light sources and adjust the electrostatic latent image forming interval accordingly, bridging the gap between physical mark formation and digital adjustment control.
2Manufacturing precision
If the electrostatic latent image forming interval is adjusted using related art methods, then some adjustment can be achieved, but the fluctuation in forming interval continues to affect image quality
Solution Approach 1:
The system implements a feedback mechanism where the sensor continuously detects the actual positions of adjustment marks formed by multiple light sources, and the controller uses this feedback information to calculate and correct the electrostatic latent image forming interval. This closed-loop feedback ensures that adjustments compensate for fluctuations in real-time, improving both precision and reliability of image formation.
Solution Approach 2:
The adjustment marks are formed in advance before actual image formation, allowing the system to pre-calculate the relative positions between light sources and determine appropriate adjustment values. This preliminary measurement and adjustment preparation ensures that when actual imaging occurs, the forming interval is already optimized to compensate for known light source position variations.
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 enables precise adjustment of the electrostatic latent image forming interval and positions of images, reducing the influence of fluctuations and improving image quality by using a configuration that forms marks with alternating light sources, thereby enhancing the accuracy and efficiency of inter-light source and inter-color adjustments.
Implementation Method 1
a multi-beam scanning unit configured to form electrostatic latent images on a photosensitive member with a plurality of light beams respectively emitted from a plurality of light sources
Data Source
AI summary
A printer forms a first adjustment mark and a second adjustment mark on a belt when execution conditions of inter-light source adjustment or inter-color adjustment processing are established. In the first adjustment mark, a first toner line is positioned at a leading end in the moving direction of the belt, and a second toner line is positioned at a trailing end. In the second adjustment mark, a second toner line is positioned at a leading end, and a first toner line is positioned at a trailing end.