Charging Voltage Determination for Image Forming Apparatus
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Solution Overview
Problem
Existing image forming apparatuses require lengthy processes for determining optimal charging voltages, leading to increased user waiting times due to the need for frequent recalibration of peak-to-peak voltages based on environmental changes and photoreceptor drum conditions.
Innovation Solution
An image forming apparatus that includes a processor to selectively perform either a first or second charging voltage determination process, with the second process being faster and adapted based on temperature changes, allowing for quicker derivation of optimal peak-to-peak voltages for various processes such as printing, image stabilization, and toner resupply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first charging voltage determination process is performed to accurately determine optimal peak-to-peak voltage, then image quality and photoreceptor drum protection are improved, but user waiting time increases
Solution Approach 1:
The system changes the determination process based on temperature parameters. When temperature change exceeds a threshold, the full first determination process is executed to ensure image quality. When temperature change is within threshold, a simplified second determination process is used to reduce waiting time. This parameter-based adaptation resolves the contradiction by adjusting the determination thoroughness according to environmental conditions.
Solution Approach 2:
The system dynamically selects between two determination processes based on real-time temperature monitoring. The first process (comprehensive measurement) and second process (simplified estimation) are dynamically chosen according to whether temperature change exceeds the threshold, making the system adaptive to environmental variations while balancing quality and speed requirements.
2Reliability
If frequent recalibration of charging voltage is performed to adapt to environmental changes, then charging uniformity is improved, but productivity decreases
Solution Approach 1:
The system uses temperature change as a trigger parameter to determine when recalibration is necessary. By monitoring temperature variations and comparing against a threshold, the system performs comprehensive voltage determination only when environmental changes warrant it, rather than recalibrating frequently regardless of actual need. This maintains charging uniformity while minimizing productivity impact.
Solution Approach 2:
The system monitors its own operating conditions (temperature) and autonomously decides when recalibration is necessary. This self-service approach allows the system to maintain optimal performance without external intervention or excessive recalibration cycles, balancing quality maintenance with operational efficiency.
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 significantly reduces user waiting times by allowing for rapid determination of optimal charging voltages, preventing poor image formation and photoreceptor drum abrasion, while maintaining image quality and extending equipment lifespan.
Implementation Method 1
A superimposed voltage of a DC voltage and an AC voltage is applied to the charger so that the charger can charge the surface of the photoreceptor drum uniformly
Implementation Method 2
a measuring device that measures the alternating current flowing in the charger via the photoreceptor drum
Data Source
AI summary
An image forming apparatus has: an image supporting member; a charger in proximity to the image supporting member; a power source unit configured to apply charging voltages to the charger sequentially, the charging voltages including alternating voltages having different peak-to-peak voltages, respectively; an amperometric detector configured to detect values of alternating currents flowing in the charger during application of the charging voltages; and a processor configured to carry out a first charging voltage determination process or a second charging voltage determination process requiring a shorter time than the first charging voltage determination process selectively based on a detection result of the amperometric detector. The processor carries out the first charging voltage determination process or the second charging voltage determination process selectively in accordance with a difference between an ambient temperature at a previous time of carrying out the first charging voltage determination process and a current ambient temperature.