Image Forming Apparatus Automatic Density Control
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in maintaining consistent image density and gradation characteristics due to variations in temperature, humidity, and the accumulation of image forming sheets, especially when components like the photosensitive drum, charging unit, or developing unit are exchanged, leading to potential deviations in output image density and gradation.
Innovation Solution
An image forming apparatus that automatically adjusts image forming conditions by detecting the mounting of new units and executing a second control process to adjust contrast potential and gamma look-up table (γLUT) settings based on density detection results, ensuring optimal image formation without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual image density control is executed after component exchange, then image quality is improved, but user operation complexity increases and time is consumed
Solution Approach 1:
The image forming apparatus automatically detects component exchange through mounting detection devices and autonomously executes the second control process to adjust contrast potential and generate γLUT, eliminating the need for manual user operation while maintaining image quality consistency
Solution Approach 2:
The system performs preliminary detection of component mounting status and automatically executes control adjustments before actual image formation begins, ensuring image quality is optimized in advance without requiring user intervention during operation
2Manufacturing precision
If manual image density control is executed after component exchange, then image quality is improved, but processing time increases
Solution Approach 1:
The system automatically executes the second control process immediately upon detecting component exchange, performing all necessary adjustments for contrast potential and γLUT generation before actual image formation begins, thereby eliminating time loss without requiring manual user operations
Solution Approach 2:
The system uses density detection results from reading devices to automatically adjust image forming conditions through feedback control, enabling rapid autonomous optimization of image density without manual intervention delays
3Adaptability or versatility
If component exchange is allowed during maintenance, then device adaptability is improved, but image density consistency deteriorates
Solution Approach 1:
Mounting detection devices detect when components are exchanged and trigger automatic execution of the second control process, which uses density detection feedback to adjust contrast potential and generate appropriate γLUT, thereby automatically restoring image density consistency after component exchange
Solution Approach 2:
The system performs preliminary automatic control adjustments immediately upon detecting component mounting, ensuring image density consistency is restored before actual image formation begins, eliminating the need for manual post-exchange calibration
4Manufacturing precision
If automatic control adjustment is executed after component exchange, then image density consistency is improved, but device complexity increases
Solution Approach 1:
The mounting detection devices and control mechanisms serve multiple functions: detecting component exchange, triggering control processes, and coordinating with existing image formation systems, thereby reducing the need for separate dedicated components and minimizing overall system complexity
Solution Approach 2:
The automatic control adjustment system is integrated with the existing image forming apparatus control structure, merging the second control process with the γLUT generation and contrast potential control functions already present in the system, thereby avoiding significant complexity increase
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 ensures consistent image density and gradation characteristics by automatically adjusting image forming conditions post-component exchange, reducing the risk of deviations and improving image quality without the need for manual user operations.
Implementation Method 1
a charging unit configured to charge the image carrier
Implementation Method 2
an exposure unit configured to form an electrostatic latent image by exposing the image carrier charged by the charging unit based on image data
Implementation Method 3
a developing unit configured to develop the electrostatic latent image with a toner
Data Source
AI summary
An image forming apparatus includes a first reading device which reads a reference image formed on a sheet, a second reading device which reads a reference image formed on an image carrier, a control device which can execute a first control process for adjusting image formation conditions based on a density of the reference image acquired from a read result of the first reading device, and a second control process for adjusting the image formation conditions based on a density of the reference image acquired from a read result of the second reading device, wherein the control device executes the second control process before performing image formation based on the image data when the first control process has not been executed in a period from when mounting of the unit configuring the image forming device is detected to when image formation is performed.