Halogen Lamp Heater Voltage Control for Fixing Roller
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Solution Overview
Problem
Conventional halogen lamp heaters experience chemical attacks when performing half-wave control, leading to tungsten halide formation and filament thinning due to uneven voltage application, which complicates noise reduction and component management.
Innovation Solution
The proposed fixing device employs halogen lamp heaters with reference voltages set according to halogen gas densities, allowing for half-wave control while preventing effective voltage from dropping below the reference voltage, thus preventing chemical attacks by adjusting the output duty based on temperature detection and target temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If half-wave control is performed on a conventional halogen lamp heater, then the control precision is improved, but chemical attack occurs due to effective voltage differing from rated voltage
Solution Approach 1:
The patent changes the parameter of halogen gas density in the lamp heater to enable half-wave control without chemical attack. By adjusting the gas density, the heater can operate reliably at reduced effective voltage while maintaining the halogen cycle functionality, thus resolving the contradiction between control precision and heater reliability
Solution Approach 2:
The patent applies preliminary anti-action by pre-adjusting the halogen gas density before implementing half-wave control. This preventive measure ensures that when half-wave control is applied, the effective voltage remains sufficient to prevent chemical attack, thereby protecting the heater filament from degradation while achieving precise temperature control
2Measurement precision
If Duty control depending on time ratio is performed, then the temperature control precision is improved, but terminal noise and harmonic noise are generated
Solution Approach 1:
The patent adopts half-wave control instead of Duty control, which simplifies the control circuit and eliminates the need for complex antinoise circuits and components. This approach generates minimal noise while maintaining adequate temperature control precision, effectively reducing harmful noise factors without sacrificing control capability
3Device complexity
If half-wave control is performed, then the device complexity is reduced, but chemical attack occurs leading to filament thinning
Solution Approach 1:
The patent changes the physical parameter of halogen gas density to enable half-wave control without causing chemical attack. This parameter adjustment allows the use of a simpler control circuit while maintaining filament integrity and extending filament life, thus resolving the contradiction between device complexity and component durability
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 solution effectively prevents chemical attacks and ensures smooth halogen cycle operation, maintaining heater performance and extending filament life by maintaining optimal voltage levels during half-wave control.
Implementation Method 1
a halogen lamp heater that heats the fixing roller (183)
Implementation Method 2
In this halogen lamp heater, tungsten gasified from the tungsten filament due to a temperature rise binds to the halogen gas contained in the halogen lamp heater, to generate tungsten halide. The tungsten halide is thermally decomposed by the filament, and the tungsten is deposited on the filament.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Chemical attacks are prevented in a case where half-wave control is performed on a halogen lamp heater (186). A fixing device including a fixing roller (183), a pressure roller (184) pressed against the fixing roller (183), and halogen lamp heaters (186 to 188) that heat the fixing roller (183) includes: a temperature detecting unit (185) that detects the temperature of the fixing roller (183); and a control unit (10) that performs half-wave control on the halogen lamp heater (186) by calculating an output Duty in accordance with the temperature detected by the temperature detecting unit (185) and performing energization or de-energization for each half-wave of an AC waveform in accordance with the output Duty, and performs switch on/off control on the other halogen lamp heaters (187 and 188). The reference voltage of the halogen lamp heater (186) is lower than the reference voltage of the halogen lamp heaters (187 and 188), the reference voltages being set in accordance with the densities of the contained halogen gases.