Image Transfer Current Feedback for Toner Scattering Control
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Solution Overview
Problem
Existing image forming apparatuses using electrophotographic technology face issues with toner transfer due to inconsistent transfer current settings, leading to toner scattering, image bleeding, and blur, especially when paper moisture content varies, and users cannot adjust transfer bias limits to achieve desired image quality.
Innovation Solution
An image forming apparatus that allows dynamic adjustment of transfer current limits based on detected current values and user input, enabling constant-voltage control with adaptable upper and lower limits to maintain optimal transfer conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant-voltage control is applied to transfer bias, then transfer stability is improved, but image quality deteriorates due to toner scattering and bleeding when transfer current becomes excessive
Solution Approach 1:
The system detects the actual transfer current during the transfer process and feeds this information back to the control unit. Based on the detected current value, the control unit dynamically adjusts the transfer bias voltage to maintain transfer current within the optimal range, thereby preventing toner scattering and image bleeding while preserving transfer stability.
Solution Approach 2:
The system changes the transfer bias voltage parameter dynamically based on the detected transfer current. When transfer current exceeds the upper limit, the transfer bias voltage is reduced; when it falls below the lower limit, the voltage is increased. This parameter adjustment ensures optimal transfer current regardless of variations in recording material electric resistance.
2Manufacturing precision
If transfer current limits are set to prevent image defects, then image quality is improved, but user flexibility deteriorates as operators cannot adjust bias settings for different image requirements
Solution Approach 1:
The system provides dynamic adjustability of transfer current limits through the operating portion, allowing operators to modify upper and lower limit values based on specific image formation requirements. This dynamic adjustment capability maintains image quality while restoring user flexibility for different operational scenarios.
Solution Approach 2:
The system allows operators to preliminarily set desired transfer current limits before image formation begins. These pre-set limits are then applied during the transfer process, enabling operators to prepare optimal settings for different types of images or recording materials in advance.
3Manufacturing precision
If transfer bias is adjusted based on initial electric resistance measurement, then transfer performance is improved initially, but performance deteriorates over time as electric resistance changes with temperature rise
Solution Approach 1:
Instead of relying on initial electric resistance measurements, the system continuously detects transfer current during actual image formation and uses this feedback to adjust transfer bias in real-time. This approach compensates for temperature-induced resistance changes and maintains consistent transfer performance throughout continuous operation.
4Adaptability or versatility
If recording material electric resistance varies due to moisture content, then adaptability is improved, but transfer control precision deteriorates as fixed bias settings cannot accommodate different materials
Solution Approach 1:
The system detects transfer current for each recording material and dynamically adjusts transfer bias based on actual measurements rather than relying on pre-set values for different material types. This feedback mechanism automatically adapts to variations in recording material electric resistance caused by moisture content differences.
Solution Approach 2:
The system performs self-adjustment of transfer bias by automatically detecting transfer current and modifying voltage settings without requiring manual intervention or pre-programming for different recording material types. The system serves itself by adapting to material variations autonomously.
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
Ensures consistent and high-quality image transfer by dynamically adjusting transfer current limits, addressing issues of toner scattering and image quality, regardless of paper moisture variations and user preferences.
Implementation Method 1
The transfer of the toner image from the image bearing member onto the recording material is carried out by applying a transfer bias to a transfer member for forming a transfer portion in contact with the image bearing member
Data Source
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AI summary
An image forming apparatus includes an image bearing member, a transfer member, a voltage source, a current detecting portion, a controller, and a receiving portion. During the recording material being passing through the transfer portion, the controller controls a voltage applied to a transfer member on the basis of a detection result of the current detecting portion so that a current flowing through the transfer member falls within a predetermined range. The controller sets at least one of an upper limit and a lower limit of the predetermined range on the basis of a predetermined voltage changing instruction received by the receiving portion.