Transparent Window Cleaning for Laser Scanning Accuracy
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Solution Overview
Problem
In image forming apparatuses using the electrophotographic method, foreign substances like toner or dust on the transparent window of the optical scanning device can block laser light, leading to reduced image quality and inaccurate adjustment of image formation conditions, especially when the cleaning process is not adequately executed before forming adjustment patterns.
Innovation Solution
An image forming apparatus is designed with a cleaning mechanism that cleans the transparent window before executing an adjustment sequence, ensuring the optical scanning device is free from foreign substances, and a controller unit coordinates the cleaning operation with the formation of adjustment patterns on the photosensitive drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If cleaning is performed frequently to remove foreign substances from the transparent window, then image quality is improved, but loss of time increases due to additional cleaning operations
Solution Approach 1:
The cleaning mechanism performs cleaning operations in advance before adjustment patterns are formed. By proactively cleaning the transparent window before the critical adjustment process, the system ensures optimal light transmission without delaying the adjustment sequence, thus resolving the contradiction between maintaining image quality and minimizing time loss.
2Measurement precision
If cleaning is performed before adjustment pattern formation, then measurement precision is improved, but loss of time increases due to additional processing steps
Solution Approach 1:
The control unit schedules cleaning operations to occur before adjustment patterns are formed by storing cleaned state information and retrieving it when needed. This preliminary cleaning ensures that the transparent window is free from foreign substances during adjustment pattern formation, maintaining high measurement precision while managing the timing to minimize overall process time.
Solution Approach 2:
The system uses the existing cleaning mechanism, originally designed for maintaining transparent window cleanliness during normal operation, to also perform cleaning before adjustment patterns. This self-service approach allows the same mechanism to serve multiple functions without adding dedicated cleaning equipment, thereby avoiding additional time loss while improving measurement precision.
3Device complexity
If cleaning operations are integrated into the adjustment sequence, then device complexity is reduced, but reliability may worsen due to increased operational interdependence
Solution Approach 1:
The control unit merges the cleaning operation control with the adjustment sequence control into a single integrated control system. By combining these functions, the patent reduces device complexity as no separate control mechanism is needed. The integration maintains reliability through systematic coordination where the control unit manages both cleaning and adjustment operations in a defined sequence, ensuring that cleaning is performed when appropriate without creating conflicting operational demands.
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 ensures high accuracy in setting image formation conditions by preventing foreign substances from affecting the density or shape of adjustment patterns, thereby maintaining image quality and precision in image formation.
Implementation Method 1
a cleaning member that moves while being in contact with the transparent window, thereby cleaning the transparent window
Implementation Method 2
a transparent window through which laser light that scans the photosensitive drum passes
Implementation Method 3
configured to develop an electrostatic latent image using toner, the electrostatic latent image being formed on the photosensitive drum by being scanned by the laser light
Data Source
AI summary
An image forming apparatus with an image forming unit, including a photosensitive drum and an optical scanning device having a transparent window through which laser light that scans the photosensitive drum passes. The image forming apparatus further includes a cleaning mechanism configured to clean the transparent window and a controller unit configured to control the cleaning mechanism to clean the transparent window, wherein the controller unit controls the image forming unit to form an adjustment pattern on the photosensitive drum after the cleaning mechanism performs a cleaning operation for cleaning the transparent window.