Transfer Device Dynamic Current Control for Ghost Phenomena
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Solution Overview
Problem
Image forming devices face issues with low image forming rates leading to inadequate transfer current, resulting in residual electric charge on photoconductor drums, which can cause image defects like the 'ghost phenomenon' due to insufficient charge removal.
Innovation Solution
Increasing the total transfer current when the image forming rate is low, specifically by setting the first-transfer current to a higher value, ensuring effective charge removal and reducing image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the image forming rate is low, then the productivity is reduced, but the total transfer current becomes insufficient causing residual electric charge and image defects
Solution Approach 1:
The transfer current is made dynamic by adjusting its magnitude based on the image forming rate. When the image forming rate is low, the transfer current is increased to maintain sufficient charge removal capability. This dynamic adjustment ensures that the transfer device adapts to varying operational conditions and maintains reliable charge removal across different productivity levels.
Solution Approach 2:
The patent changes the parameter of transfer current magnitude in response to changes in image forming rate. By detecting the image forming rate and accordingly adjusting the transfer current parameter, the system maintains optimal charge removal ability even when productivity varies, preventing residual electric charge and image defects.
2Reliability
If a charge remover is added to eliminate residual charge, then image defects are reduced, but device complexity and cost increase
Solution Approach 1:
The transfer device is designed to perform multiple functions: it both transfers the visible image onto the medium and removes residual electric charge from the image bearing member. By making the transfer device multi-functional, the patent eliminates the need for a separate charge remover component, thereby reducing device complexity while maintaining reliable charge removal ability.
Solution Approach 2:
The transfer device serves itself by using its own transfer current to accomplish charge removal in addition to image transfer. The same electrical mechanism used for transferring the image also performs the charge removal function, eliminating the need for dedicated charge removal hardware and simplifying the overall device structure.
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 enhances charge removal abilities, reducing image defects such as the ghost phenomenon and maintaining charging ability, even without a charge remover, while keeping costs low by using a direct-current power source.
Implementation Method 1
a transfer member (T1) that transfers a visible image on an image bearing member (P) onto a medium (S)
Implementation Method 2
enhances charge removal abilities, reducing image defects such as the ghost phenomenon
Data Source
AI summary
A transfer device includes a transfer member that transfers a visible image on an image bearing member onto a medium. When an image forming rate is low, a total amount of transfer current to be supplied to a transfer region where the image bearing member and the transfer member face each other is increased, as compared with when the image forming rate is high.