Dual Transfer Power Source for Low-Resistance Media
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Solution Overview
Problem
Image forming devices face challenges in efficiently transferring images onto low-resistance recording media, such as metallic paper, due to high leakage currents and potential density steps in the transfer image, especially when using conventional transfer voltage configurations.
Innovation Solution
The device employs a dual transfer power source system, where a first transfer voltage is applied normally and a second transfer voltage of opposite polarity with a lower absolute value is activated for low-resistance media, along with a guide member configuration that minimizes current leakage through the recording medium, ensuring stable transfer operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional transfer voltage configuration is used for low-resistance recording media, then the transfer operation can proceed, but high leakage currents occur and density steps appear in the transfer image
Solution Approach 1:
The transfer power source is segmented into a first transfer power source and a second transfer power source. The first transfer power source applies a first transfer voltage to the first transfer member, while the second transfer power source applies a second transfer voltage of opposite polarity to the second transfer member. This segmentation allows independent control of voltages on each transfer member, enabling suppression of leakage currents by appropriately setting the voltage polarity and magnitude on the second transfer member.
Solution Approach 2:
The invention changes the voltage parameters by introducing a second transfer voltage with opposite polarity to the first transfer voltage. The absolute value of the second transfer voltage is set to be less than or equal to that of the first transfer voltage. This parameter change effectively suppresses leakage currents through low-resistance recording media while maintaining stable image transfer.
2Manufacturing precision
If a conventional transfer voltage configuration is used for low-resistance recording media, then the transfer operation can proceed, but density steps appear in the transfer image
Solution Approach 1:
The transfer power source is segmented into a first transfer power source and a second transfer power source. The first transfer power source applies a first transfer voltage to the first transfer member, while the second transfer power source applies a second transfer voltage of opposite polarity to the second transfer member. This segmentation allows independent control of voltages on each transfer member, enabling suppression of leakage currents that cause density steps.
Solution Approach 2:
The invention changes the voltage parameters by introducing a second transfer voltage with opposite polarity to the first transfer voltage. The absolute value of the second transfer voltage is set to be less than or equal to that of the first transfer voltage. This parameter change effectively suppresses leakage currents through low-resistance recording media, preventing density steps and ensuring uniform image density.
3Object-generated harmful factors
If the second transfer voltage has a large absolute value, then leakage current suppression may be improved, but image transfer stability deteriorates
Solution Approach 1:
The invention optimizes the voltage parameters by setting the absolute value of the second transfer voltage to be less than or equal to that of the first transfer voltage. This parameter constraint ensures that while the second transfer voltage suppresses leakage currents through its opposite polarity, it does not excessively disturb the image transfer stability maintained by the first transfer voltage.
Solution Approach 2:
The second transfer voltage acts as a counterbalancing force with opposite polarity to the first transfer voltage. By setting its absolute value to be less than or equal to the first transfer voltage, it counteracts leakage currents without overwhelming the primary transfer electric field, thus maintaining image transfer stability while suppressing harmful leakage currents.
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 configuration effectively suppresses leakage currents and maintains stable image transfer onto low-resistance papers, preventing density steps and ensuring uniform image density across the entire area, even with low-resistance media.
Implementation Method 1
a transfer power source that causes a transfer electric field to act in the transfer region by imparting a transfer voltage between the paired transfer members
Implementation Method 2
when the recording medium has a predetermined resistance value or less, or is of low resistance having a conductive layer along a medium substrate face
Data Source
AI summary
An image forming device includes an image carrier carrying an image, a transfer device including paired transfer members that transport the image carrier and a recording medium, a grounded guide member that guides the recording medium to a transfer region, and a transfer power source that produces an electric field in the transfer region causing the image to be transferred onto the recording medium. The transfer power source includes a first transfer power source that imparts a first transfer voltage to one of the paired transfer members, and a second transfer power source that, when the recording medium has a predetermined resistance value or less, or is of low resistance having a conductive layer along a medium substrate face, imparts a second transfer voltage of opposite polarity and having an absolute value less than or equal to the first transfer voltage to the other of the paired transfer members.