Heating Device Conductive Parts Cross Section Area
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Solution Overview
Problem
In heating devices with ceramic heaters, the conductive parts connecting heating resistors to power supply electrodes generate heat, leading to temperature rises and reliability issues, especially in compact designs where space is constrained, causing gloss unevenness in fixed images and increasing costs.
Innovation Solution
The heating device features electrically conductive parts with larger cross-sectional areas perpendicular to the base plate to reduce power losses and heat generation, ensuring uniform power supply and lowering temperature ratings, thus improving reliability and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large area is provided for installation of power supply electrodes to improve connection reliability, then connection reliability is improved, but the space for conductive parts is constrained causing heat generation
Solution Approach 1:
The patent changes the cross-sectional area parameter of conductive parts to reduce their resistance. By increasing the cross-sectional area perpendicular to the base plate, the resistance of conductive parts is reduced, thereby decreasing power loss and heat generation while maintaining reliable electrical connection between heating resistors and power supply electrodes
2Loss of energy
If the cross-sectional area of conductive parts is increased to reduce power loss, then heat generation is reduced, but the base plate space is reduced
Solution Approach 1:
The patent transitions from planar conductive parts to three-dimensional structures by increasing the cross-sectional area perpendicular to the base plate. This vertical dimensionality change allows the conductive parts to have larger cross-sectional areas for reduced resistance without consuming additional horizontal space on the base plate, thus reducing power loss while maintaining compact device dimensions
3Manufacturing precision
If temperature difference in longitudinal direction is reduced to prevent gloss unevenness, then image quality is improved, but temperature control complexity increases
Solution Approach 1:
The patent applies local quality by making conductive parts with larger cross-sectional areas specifically at locations where heating resistors are disposed. This localized structural modification reduces resistance and heat generation at critical areas, contributing to more uniform temperature distribution across the heating member, thereby improving gloss uniformity without requiring complex temperature control systems
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 design suppresses heat generation in conductive parts, enhances the reliability of the heating device, and reduces costs by maintaining uniform power supply and temperature control, preventing gloss unevenness in fixed images.
Implementation Method 1
The ceramic heater further includes heating resistors (e.g. of silver palladium) which are pattern-shaped on the base plate e.g. by printing or baking and which generate heat when supplied with electric power
Implementation Method 2
a conductor pattern which is low in resistance and which connects the power supply electrodes and the heating resistors to one another
Data Source
AI summary
A heating device capable of suppressing electrically conductive parts that electrically connect power supply electrodes and heating resistors from generating heat. The heating device has heating resistors disposed in a longitudinal direction of an elongated base plate and connected through electrically conductive parts to power supply electrodes disposed on one longitudinal end portion of the base plate and supplied with electric power from the power supply electrodes. The electrically conductive parts are formed such that electrically conductive parts that can provide larger amounts of power supply each have a larger cross-sectional area perpendicular to a power supply direction.