Arc-Shaped Heat Generating Member for Belt Adhesion
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Solution Overview
Problem
The existing heating devices in image processing systems face issues with excessive temperature rise of the heat generating member due to inadequate adhesion and heat transport between the belt and the heat generating member, leading to premature activation of the thermostat.
Innovation Solution
A heating device configuration where the heat generating member is formed in an arc shape along the inner peripheral surface of the belt, with specific dimensions and curvature relationships to ensure sufficient contact and heat transfer, including equations (1) D≥10 mm and 0.4 mm≥A−B≥0 mm, to prevent excessive temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat generating member is made smaller to reduce its temperature rise, then the adhesion between the belt and heat generating member becomes insufficient, but reducing the size further worsens the heat transport efficiency
Solution Approach 1:
The patent applies parameter changes by precisely controlling the outer diameter of the heat generating member and the thickness of the belt to ensure optimal adhesion. Specifically, the outer diameter of the heat generating member is set to be within 0.05mm to 0.15mm smaller than the inner diameter of the belt, and the belt thickness is controlled within 0.05mm to 0.15mm, which resolves the contradiction between preventing excessive temperature rise and maintaining sufficient adhesion.
2Temperature
If the heat generating member dimensions are reduced to control temperature, then heat transport between the heat generating member and belt becomes insufficient, leading to excessive temperature rise
Solution Approach 1:
The patent resolves this contradiction by optimizing the dimensional parameters of the heat generating member and belt. The outer diameter of the heat generating member is controlled to be within 0.05mm to 0.15mm smaller than the inner diameter of the belt, and the belt thickness is maintained within 0.05mm to 0.15mm, ensuring efficient heat transport while preventing excessive temperature rise.
3Loss of energy
If the belt and heat generating member are made to adhere more strongly to improve heat transport, then the temperature control becomes more difficult, causing excessive temperature rise
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dimensional relationship between the heat generating member and belt. The outer diameter of the heat generating member is set to be within 0.05mm to 0.15mm smaller than the inner diameter of the belt, and the belt thickness is controlled within 0.05mm to 0.15mm, which ensures sufficient heat transport while maintaining proper temperature control through controlled adhesion.
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 effective heat transport between the belt and the heat generating member, preventing excessive temperature rise and premature thermostat activation, thereby stabilizing the heating process and improving image quality.
Implementation Method 1
The heating device heats the belt with an electromagnetic induction heating method
Implementation Method 2
The heat generating member is in contact with the inner peripheral surface of the belt to make up for the lack of heating value of the belt
Data Source
AI summary
According to one embodiment, a heating device includes a belt and a contact member. The belt has a tubular shape. The contact member is provided inside the belt. The contact member is formed in an arc shape along the inner peripheral surface of the belt. The contact member is slidably in contact with the inner peripheral surface of the belt. When the amount of deflection of the belt is D, the radius of curvature of the inner peripheral surface of the belt is A, and the radius of curvature of the outer peripheral surface of the contact member is B, the following equations (1) and (2) are satisfied:D≥10 mm (1)0.4 mm≥A−B≥0 mm (2).