Fixing Belt Grounding Detection to Prevent Electrostatic Offset
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Solution Overview
Problem
Static electricity accumulates on the fixing belt in belt type or on-demand type fixing devices due to repeated sliding contact, leading to electrostatic offset and image quality deterioration.
Innovation Solution
The fixing belt is electrically connected between a power source and a ground terminal, with a controller determining current flow and controlling the heater based on this connection, using an insulated detection element like a photocoupler to ensure stable grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixing belt is connected to ground terminal to discharge static electricity, then electrostatic offset is prevented, but the connection becomes unstable due to rotation of the fixing belt
Solution Approach 1:
The patent introduces an insulated detection element as an intermediary component between the fixing belt and the control system. This element detects the grounding connection status without creating a direct electrical path, allowing stable detection of whether the fixing belt is properly grounded while avoiding interference with the rotating belt's electrical characteristics.
Solution Approach 2:
The patent implements a feedback control mechanism where the controller continuously monitors the grounding connection status through the insulated detection element and adjusts the heater operation accordingly. When grounding is detected, the heater operates to prevent electrostatic accumulation; when grounding is absent, the heater is turned off, creating a closed-loop control system that adapts to the rotating belt's connection status.
2Reliability
If the heater operates continuously to prevent electrostatic accumulation, then image quality is maintained, but energy is wasted when grounding is not present
Solution Approach 1:
The patent uses feedback control where the controller monitors grounding status through the insulated detection element and adjusts heater operation accordingly. The heater only operates when grounding is detected, eliminating unnecessary energy consumption while maintaining image quality when needed.
Solution Approach 2:
The patent changes the operational parameter of the heater from continuous operation to conditional operation based on grounding detection. The heater's on/off state is dynamically adjusted according to the grounding connection status, optimizing energy consumption while maintaining image quality stability when grounding is present.
3Loss of energy
If the heater is controlled based on grounding detection, then energy efficiency is improved, but the system complexity increases due to detection elements and control logic
Solution Approach 1:
The patent introduces an insulated detection element as an intermediary that simplifies the control system by providing a clear, stable signal about grounding status. This intermediate component handles the complexity of detecting the rotating belt's connection state, allowing the main controller to operate with simpler logic.
Solution Approach 2:
The patent replaces direct mechanical/electrical contact-based grounding detection with an insulated detection method that uses optical or electrical field interaction. This substitution eliminates the need for direct physical contact with the rotating belt, simplifying the mechanical connection requirements while maintaining reliable detection capability.
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
Prevents electrostatic offset by ensuring the fixing belt is properly grounded, maintaining image quality and preventing unintended changes in heater-belt distance.
Implementation Method 1
the insulated detection element includes a photocoupler
Implementation Method 2
the insulated detection element includes a light emitting diode and a light receiving element
Implementation Method 3
the light receiving element is connected between a second power source and a ground terminal, and the controller determines whether a current is flowing through the fixing belt by detecting a current flowing through the light receiving element
Implementation Method 4
a controller configured to control the heater to heat the fixing belt
Data Source
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AI summary
An image processing apparatus includes a fixing unit including a heater and a fixing belt. The fixing belt is electrically connected between a first power source and a ground terminal. A controller is configured to control the heater to heat the fixing belt. The controller is further configured to determine whether a current is flowing through the fixing belt and, upon determining that a current is not flowing through the fixing belt, control the heater not to heat the fixing belt.