Image Forming Control Circuit for Clock Interference Suppression
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Solution Overview
Problem
Image forming devices face issues with frequency interference, leading to striped shading in printed output due to deviations in clock signal frequencies, which existing technologies fail to adequately address.
Innovation Solution
The implementation of a dual control circuit system with a high-voltage substrate that adjusts voltage frequencies based on actual measurements of clock signal deviations, using first and second oscillation units to generate and adjust motor drive and application signals, ensuring no frequency interference occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predetermined frequency clock signal is distributed to each unit, then the device operation is simplified, but frequency deviations cause striped shading in printed output
Solution Approach 1:
The patent implements feedback by measuring the actual frequency of the clock signal and using this measurement to adjust the application signal frequency. The frequency measurement unit continuously monitors the clock signal frequency, and the control unit uses this feedback to dynamically adjust the application signal, ensuring synchronization and preventing striped shading while maintaining system simplicity.
Solution Approach 2:
The patent changes the frequency parameter of the application signal based on measured clock signal frequency. Instead of using a fixed predetermined frequency, the system dynamically adjusts the application signal frequency to match the actual clock signal frequency, resolving the contradiction between simplified signal distribution and print quality.
2Device complexity
If the clock signal frequency is fixed, then the control system is simple, but frequency interference occurs causing image quality degradation
Solution Approach 1:
The patent transforms the static fixed frequency control into a dynamic system that adapts to actual frequency conditions. The measurement unit continuously monitors clock signal frequency, and the control unit dynamically adjusts the application signal frequency in real-time, preventing frequency interference while keeping the control circuit relatively simple through automated adjustment.
Solution Approach 2:
The system uses feedback from frequency measurements to automatically adjust the application signal frequency. This closed-loop control prevents frequency interference and maintains image quality without requiring complex manual tuning or multiple fixed-frequency circuits.
3Reliability
If different frequency signals are used in different units, then frequency interference is avoided, but synchronization between units becomes difficult
Solution Approach 1:
The patent makes the application signal generation unit universal by adjusting its frequency to match the clock signal frequency. Instead of using different fixed frequencies in different units, the system uses a single adaptable frequency source that synchronizes with the clock signal, preventing frequency interference while maintaining synchronization through automated frequency matching.
Data Source
AI summary
An image forming device includes a first control circuit, a second control circuit, a high-voltage substrate, and a polygon motor. The high-voltage substrate applies a voltage with a frequency of an application signal to a toner image forming member. The first control circuit generates a first clock signal, counts the number of the first clock signal, and generates a motor drive signal. The first control circuit counts the first clock signal and generates an adjustment signal. The second control circuit counts the number of actual measurements which is a count value of the second clock signal during one cycle of the adjustment signal. The second control circuit counts the second clock signal by a set value. A setting circuit in the second control circuit sets the set value in accordance with the difference between the number of actual measurements and a theoretical number of times.