Image Forming Apparatus Voltage Control for Developer Adherence
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Solution Overview
Problem
Existing image forming apparatuses fail to effectively control developer agent adherence to unexposed areas of photosensitive members due to neglect of peripheral velocity ratios and humidity variations in voltage difference management between the charger and developer roller.
Innovation Solution
An image forming apparatus and method that incorporates a controller to dynamically adjust the voltage difference between the charger and developer roller based on the peripheral velocity ratio and humidity levels, using sensors for environmental data input and pre-defined tables to determine optimal voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage difference between charger voltage and developer-voltage is controlled to be smaller than a predetermined reference value, then undesirable adherence of developer agent to photosensitive member is restrained, but when peripheral velocity ratio changes or humidity changes, the applied voltage difference may not match with preferable value and adherence control becomes ineffective
Solution Approach 1:
The patent applies dynamics by making the voltage difference control adaptive and variable rather than fixed. The controller dynamically adjusts the voltage difference between charger and developer roller based on detected peripheral velocity ratio and humidity conditions, allowing the system to adapt to changing operational parameters and environmental conditions to maintain effective adherence control.
Solution Approach 2:
The patent changes physical parameters (voltage difference, peripheral velocity ratio, humidity detection) to optimize system performance. By detecting changes in peripheral velocity ratio and humidity, and相应地 adjusting the voltage difference parameter, the system maintains optimal adherence control under varying conditions.
2Manufacturing precision
If fixed voltage difference control is used, then device complexity is reduced, but manufacturing precision and image quality consistency deteriorate under varying peripheral velocity ratios and humidity
Solution Approach 1:
The patent implements feedback control by using sensors to detect peripheral velocity ratio and humidity conditions, then using this information to adjust the voltage difference applied between charger and developer roller. This closed-loop feedback system maintains consistent image quality by compensating for variations in operational and environmental conditions.
Solution Approach 2:
The system performs self-adjustment by automatically detecting changes in peripheral velocity ratio and humidity, and autonomously modifying the voltage difference parameter without requiring external intervention, thereby maintaining optimal performance across varying conditions.
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
Effectively prevents developer agent adherence to unexposed areas across varying conditions, ensuring consistent image quality by optimizing voltage differences in response to changes in peripheral velocity ratios and humidity.
Implementation Method 1
a humidity sensor configured to detect humidity
Implementation Method 2
a charger configured to charge the photosensitive member
Implementation Method 3
a developer roller configured to contact the photosensitive member and supply a developer agent to the photosensitive member
Data Source
AI summary
An image forming apparatus, including a photosensitive member, a charger configured to charge the photosensitive member, a developer roller configured to contact the photosensitive member and supply a developer agent to the photosensitive member, a humidity sensor configured to detect humidity, and a controller is provided. The controller is configured to a voltage-application controlling process, in which the controller controls the photosensitive member and the developer roller to rotate, applies a charger-voltage to the charger, and applies a developer-voltage to the developer roller. In the voltage-application controlling process, the controller controls a voltage difference between the charger-voltage and the developer-voltage based on a peripheral velocity ratio of the developer roller with respect to the photosensitive member and the humidity.