Optical Writing Control Device Misalignment Correction
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in balancing toner consumption with accuracy during misalignment correction, particularly when using patterns for correction drawn with varying widths, which can lead to inaccurate readings and impaired apparatus operation.
Innovation Solution
An optical writing control device that employs two patterns for misalignment correction: a narrow width pattern and a wide width pattern, where the light source is controlled to draw the narrow width pattern after calculating the correction value based on the detection signal of the wide width pattern, optimizing the correction process while minimizing toner usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a narrow width pattern is drawn for correction, then toner consumption is reduced, but reading accuracy deteriorates due to sensor detection area limitations
Solution Approach 1:
The correction process is divided into two stages: first drawing a wide width pattern for accurate sensor detection and correction value calculation, then drawing a narrow width pattern for final precise correction. This segmentation allows each pattern to serve its specific function optimally.
Solution Approach 2:
The wide width pattern is drawn first as a preliminary step to calculate the correction value. This preliminary action ensures that the correction value is accurately determined before the final narrow width pattern is drawn, preventing reading errors.
2Measurement precision
If a wide width pattern is drawn for correction, then reading accuracy is improved, but toner consumption increases
Solution Approach 1:
The correction patterns are segmented into two types with different widths, each serving a specific purpose. The wide width pattern is used only for the initial correction value calculation where high reading accuracy is critical, while the narrow width pattern is used for subsequent corrections where less toner is needed.
Solution Approach 2:
Different pattern widths are applied locally based on the correction stage. The wide width pattern is used locally at the beginning when accurate detection is most critical, and the narrow width pattern is used locally in subsequent stages where the correction value is already established.
3Measurement precision
If correction is made based on wide width pattern first, then narrow width pattern, then misalignment between corrections impairs accuracy
Solution Approach 1:
The system uses feedback from the sensor detection of the wide width pattern to calculate the correction value, which then guides the drawing position of the narrow width pattern. This feedback mechanism ensures that the second correction is based on accurate information from the first correction, maintaining reliability.
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 enhances the accuracy of misalignment correction while reducing toner consumption by ensuring precise alignment and efficient operation of the image forming apparatus.
Implementation Method 1
a light source that exposes a photosensitive element and forms an electrostatic latent image on the photosensitive element
Implementation Method 2
a sensor that detects an image on a conveying path on which the image obtained by developing the electrostatic latent image formed on the photosensitive element is transferred and conveyed
Data Source
AI summary
An optical writing control device includes a light emission control unit that controls light emission of a light source to exposes a photosensitive element. The light emission control unit is configured to draw two patterns as patterns for correction used to correct a transfer position of a developer image obtained by developing an electrostatic latent image formed on the photosensitive element, the two patterns including a narrow width pattern where a width of the pattern corresponds to a width of a detection area of a sensor that detects the patterns, in the main-scanning direction, and a wide width pattern having a wider width than the narrow width pattern, and control the light emission, after calculation of a correction value based on a detection signal of the wide width pattern is properly completed, in a manner where the narrow width pattern is drawn upon the calculation of the correction value.