Induction Heating Rotary Body with Magnetic Path Control
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Solution Overview
Problem
Existing electromagnetic induction heating devices face challenges in efficiently heating recording sheets with uniform temperature profiles, leading to potential high-temperature offsets and reduced fixing quality in image forming apparatuses.
Innovation Solution
The use of a heat generation control member made of a temperature-sensitive magnetic material with a continuous portion and controlling portions, such as slits, to manage eddy currents and heat transfer along the axis of the heating rotary body, optimizing magnetic flux density and reducing self-heat-generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electromagnetic induction heating is used to heat the heating rotary body, then heating efficiency is improved, but non-uniform temperature distribution occurs causing high-temperature offsets
Solution Approach 1:
The magnetic path forming member is divided into multiple independent magnetic paths along the axial direction of the heating rotary body. Each magnetic path generates eddy currents independently, creating localized heating zones that can be uniformly distributed along the heating surface, preventing temperature concentration and high-temperature offsets.
Solution Approach 2:
Different regions of the magnetic path forming member are designed with different magnetic properties to create localized heating effects. The magnetic path forming member includes a heat generation control member with temperature-sensitive magnetic material that adjusts magnetic flux density distribution, ensuring uniform temperature profile across the heating surface while maintaining high heating efficiency.
2Temperature
If the magnetic path forming member is made of temperature-sensitive magnetic material, then temperature control is improved, but self-heat generation increases
Solution Approach 1:
The magnetic path forming member is segmented into multiple magnetic paths, which distributes the eddy current generation and reduces concentrated self-heat generation. The temperature-sensitive magnetic material in each segment responds to local temperature conditions, providing precise temperature control while minimizing overall energy loss through distributed rather than concentrated heating effects.
3Speed
If eddy current magnitude is increased for efficient heating, then heating speed is improved, but temperature uniformity deteriorates
Solution Approach 1:
The magnetic path forming member creates multiple independent magnetic paths that generate eddy currents simultaneously. This segmentation allows high eddy current magnitudes to be maintained across multiple zones without causing temperature concentration in a single area, achieving both fast heating speed and uniform temperature distribution.
Solution Approach 2:
The magnetic path forming member is designed with varying magnetic properties along the axial direction to optimize eddy current distribution. By controlling the magnetic flux density in different local regions, the system maintains high heating speed through sufficient eddy current generation while ensuring uniform temperature distribution through optimized local magnetic characteristics.
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 ensures uniform temperature profiles, prevents excessive temperature increases, and maintains efficient heat generation, enhancing the fixing process and image quality in image forming apparatuses.
Implementation Method 1
a heat generation body (312) that generates heat through electromagnetic induction; a magnetic field generating unit (56) that generates a magnetic field for causing the heat generation body (312) to produce heat through the electromagnetic induction
Implementation Method 2
The magnetic path forming member (34) includes controlling portions (70) that control a magnitude of eddy current which is generated through the electromagnetic induction caused by the magnetic field generating unit (56)
Implementation Method 3
a heating rotary body (31) that receives the heat from the heat generation body (312) and rotates
Data Source
AI summary
An electromagnetic induction heating device includes a heat generation body, a heating rotary body, a magnetic filed generating unit and a magnetic path forming member. The heat generation body generates heat through electromagnetic induction. The heating rotary body receives the heat and rotates. The magnetic field generating unit is opposed to the heating rotary body and generates a magnetic field for causing the heat generation body to produce heat through the electromagnetic induction. The magnetic path forming member is opposed to the magnetic filed generating unit across the heating rotary body. The magnetic path forming member includes controlling portions and a continuous portion. The controlling portions control a magnitude of eddy current which is generated through the electromagnetic induction. The continuous portion allows heat transfer along a direction of an axis of the heating rotary body. The continuous portion is opposed to an aperture portion or an end portion of the magnetic field generating unit.