Image Forming Apparatus Bias Control for Density Stability
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in maintaining stable image density due to cyclic fluctuations in the developing gap and charging bias, leading to fluctuations in toner adhesion and image quality.
Innovation Solution
The image forming apparatus incorporates a controller that executes parallel processes to cyclically change the developing bias and charging bias based on predetermined pattern data, with the controller determining whether to execute these fluctuations in conjunction with the image forming process to stabilize image density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the controller executes determination process to decide whether to execute fluctuation control, then the image density stability is improved, but the control process complexity increases
Solution Approach 1:
The controller executes a determination process before the image forming process to decide whether fluctuation control should be applied. This preliminary decision-making prevents unnecessary fluctuation control operations, simplifying the overall control process while maintaining image density stability when needed.
Solution Approach 2:
The system dynamically adjusts the control strategy by switching between executing and not executing fluctuation control based on real-time determination. This dynamic approach allows the controller to adapt to different operating conditions, maintaining precision without permanently increasing system complexity.
2Manufacturing precision
If the controller executes parallel processes to cyclically change developing bias and charging bias, then the image density fluctuation is suppressed, but the processing complexity increases
Solution Approach 1:
The controller merges the fluctuation control of developing bias and charging bias into a unified parallel processing framework. By coordinating these two controls simultaneously based on predetermined pattern data, the system suppresses image density fluctuations through integrated control rather than separate sequential adjustments.
Solution Approach 2:
The system applies periodic fluctuations to the developing bias and charging bias according to predetermined pattern data. This periodic action counteracts the cyclic fluctuations in the developing gap and charging processes, thereby suppressing image density variations through rhythmic compensation.
3Reliability
If the controller executes fluctuation control in parallel with image forming process, then the image quality stability is improved, but the execution time increases
Solution Approach 1:
The fluctuation control is executed in parallel with the image forming process, ensuring continuous operation without interruption. The controller simultaneously manages the image forming operations and the bias fluctuations, eliminating the need for sequential execution and avoiding additional time loss.
Solution Approach 2:
The parallel execution of periodic fluctuation control with the continuous image forming process allows the system to maintain image quality stability through rhythmic bias adjustments without halting or delaying the overall image formation workflow.
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 effectively suppresses cyclical image density fluctuations, improving the stability and quality of the printed images by adjusting biases in real-time to compensate for variations in the developing and charging processes.
Implementation Method 1
a charger to charge a surface of the latent image bearer
Implementation Method 2
a developing device to develop the latent image with a developer
Data Source
AI summary
An image forming apparatus includes an image forming unit and a controller. The image forming unit includes a latent image bearer, a charger to charge the latent image bearer, an exposure device to expose a latent image on the surface of the latent image bearer, and a developing device to develop the latent image with a developer. The controller executes an image forming process, a first fluctuation control that cyclically changes a developing bias supplied to the developing device based on predetermined first pattern data, and a second fluctuation control that cyclically changes a charging bias supplied to the charger based on predetermined second pattern data, in parallel. The controller executes a determination process to determine whether the controller executes the first fluctuation control. When the controller determines not to execute the first fluctuation control, the controller determines not to execute the second fluctuation control, too.