Photoreceptor Voltage Margin Control for Wear Reduction
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Solution Overview
Problem
Conventional image forming apparatuses face a reduction in photoreceptor life due to excessive wear caused by large margins in peak-to-peak voltage settings, especially at high temperatures, leading to premature abrasion of the surface layer.
Innovation Solution
An image forming apparatus that acquires the variation of the film thickness during an initial period and adjusts the margin of the peak-to-peak voltage Vpp to minimize wear, employing a storage unit to store target values and employing a hardware processor to set a reduced margin based on the accumulated number of rotations, thereby extending the photoreceptor's life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large margin is set in the peak-to-peak voltage Vpp to prevent charging ununiformity, then image quality is improved, but the surface layer of the photoreceptor is abraded more quickly
Solution Approach 1:
The patent applies dynamics by making the peak-to-peak voltage Vpp adjustable rather than fixed. The control unit dynamically changes the Vpp value based on the accumulated number of rotations of the photoreceptor, transitioning from a larger initial value to a smaller value as the photoreceptor wears. This dynamic adjustment resolves the contradiction by adapting the voltage to the current state of the photoreceptor surface layer.
Solution Approach 2:
The patent changes the parameter of peak-to-peak voltage Vpp based on the accumulated number of rotations. By storing multiple Vpp values and selecting appropriate values based on rotation count, the system optimizes the balance between charging uniformity and photoreceptor wear, extending photoreceptor life while maintaining image quality.
2Manufacturing precision
If a larger peak-to-peak voltage Vpp is applied to eliminate minute charging ununiformity, then image noise is reduced, but the wear variation of the surface layer increases
Solution Approach 1:
The patent applies preliminary action by setting a relatively large peak-to-peak voltage Vpp during the initial period when the photoreceptor is new and has not yet worn significantly. This ensures excellent charging uniformity from the start. As the photoreceptor accumulates rotations and wears, the system transitions to smaller Vpp values, preventing excessive wear variation while maintaining adequate charging uniformity throughout the photoreceptor's life.
Solution Approach 2:
The system dynamically adjusts the peak-to-peak voltage Vpp based on the accumulated number of rotations, transitioning from larger values that eliminate charging ununiformity to smaller values that reduce wear variation. This dynamic parameter change resolves the contradiction between achieving high charging uniformity and minimizing wear variation.
3Ease of operation
If a fixed margin is used in peak-to-peak voltage settings, then control simplicity is maintained, but photoreceptor life is reduced due to excessive wear
Solution Approach 1:
The patent implements a dynamic control system that automatically adjusts the peak-to-peak voltage Vpp based on the accumulated number of rotations stored in memory. While the control logic is enhanced, the system remains automated and simple to operate, eliminating the need for manual intervention. The control unit automatically selects appropriate Vpp values from stored values, maintaining ease of operation while significantly extending photoreceptor life through adaptive voltage management.
Solution Approach 2:
The system uses feedback from the accumulated rotation count to automatically adjust the peak-to-peak voltage Vpp. The control unit monitors the photoreceptor usage and dynamically selects appropriate voltage values from stored values, creating a closed-loop control system that extends photoreceptor life without complicating user operation.
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
The solution effectively reduces the wear rate of the photoreceptor's surface layer, ensuring the minimum film thickness required for operation and preventing premature failure, while maintaining image quality by dynamically adjusting the peak-to-peak voltage margin.
Implementation Method 1
a charging roller, which is a roller-shaped charging member, is disposed in contact with or in close proximity to the surface of the photoreceptor, and a charging voltage is applied to the charging roller to perform proximity discharge, thereby charging the surface of the photoreceptor
Implementation Method 2
discharge and static elimination between the charging roller and the photoreceptor are forcibly repeated by the AC component. Thus, the AC charging method has a higher charging ability than the DC charging method, and has an advantage of high uniformity of the potential of the surface of the photoreceptor after charging (charging uniformity) because of the action of the alternating electric field
Data Source
AI summary
An image forming apparatus includes: a photoreceptor including a surface layer; a storage that stores a target value of a variation of a film thickness of the surface layer; and a hardware processor that acquires a variation of the film thickness in a first period within which the photoreceptor rotates a predetermined number of times, and sets a margin that is an amount of a portion for allowance with respect to a proper value of a parameter related to control of the photoreceptor, the margin being to be employed after the first period.