Image Heating Apparatus Temperature Detection Wire Routing
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Solution Overview
Problem
Existing image heating devices face challenges in efficiently detecting abnormal temperature rises in high-temperature areas, leading to reduced response times and increased wear due to frequent contact between electric wires and the image heating member, which affects the lifespan of both components.
Innovation Solution
An image heating apparatus with a temperature detecting member positioned between the magnetic core and the heat generating member, where the electric wire is routed through a core lacking portion to the outside, reducing contact and abrasion, and an interrupting portion to control the electric power supply based on temperature output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the temperature detecting member is positioned at the heat generating portion (where the belt member opposes the coil), then the response time for detecting abnormal temperature rise is improved, but the electric wire and the image heating member are liable to contact and abrade each other frequently
Solution Approach 1:
The patent positions the temperature detecting member at a location that is spatially separated from the heat generating portion in the radial direction. Specifically, the detecting member is arranged at a position where it does not oppose the coil, thereby detecting temperature indirectly through thermal conduction from the heat generating portion. This dimensional repositioning eliminates the contact issue while maintaining detection capability.
Solution Approach 2:
The patent introduces a magnetic core as an intermediary structure between the coil and the belt member. The temperature detecting member is positioned between the magnetic core and the belt member, using the magnetic core as a mediator to transmit thermal information without requiring direct contact between the detecting member and the heat generating portion, thus avoiding wire abrasion.
2Use of energy by moving object
If a magnetic core is disposed inside the belt and the temperature detecting member is provided between the magnetic core and the belt, then the heat generating efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The magnetic core serves multiple functions simultaneously: it concentrates magnetic flux to improve heat generating efficiency, provides a mounting structure for the temperature detecting member, and acts as a thermal conduit for temperature detection. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity.
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 configuration enhances heat generating efficiency, reduces contact between the electric wire and the image heating member, prolongs their lifespan, and allows for timely detection and response to abnormal temperatures.
Implementation Method 1
the electromagnetic induction heating device generates heat in such a manner that an exciting coil is disposed to an electroconductive layer and magnetic flux is generated in the electroconductive layer to cause an eddy current in the electroconductive layer
Implementation Method 2
magnetic flux is generated in the electroconductive layer to cause an eddy current in the electroconductive layer
Implementation Method 3
a magnetic core disposed inside the heat generating member
Data Source
AI summary
An image heating apparatus includes a coil for generating magnetic flux; a rotatable heater, having an electroconductive layer which generates heat by the magnetic flux, for heating an image on a recording material, the heater being disposed inside the coil; a magnetic member; a detector, disposed in an area between the magnetic member and an area of the heater opposing the coil, for detecting a temperature of the heater; an electric wire electrically connected to the detector; and an interruptor, for interrupting electric power supply to the coil on the basis of an output of the detector supplied through the electric wire. The magnetic member includes an opening through which the wire passes.