Wiring Sheet Resistance Layout for Uniform Sheet Heater Temperature
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Solution Overview
Problem
The use of thin electrodes, such as metal wires, in wiring sheets leads to significant temperature variations due to high resistance values, which cannot be ignored, affecting heat generation efficiency.
Innovation Solution
A wiring sheet design with specific resistance value conditions (r1/R ≤ 300, rn+1 ≤ rn, and 0 < r1 - rN ≤ NR) and electrode configurations, along with a base material supporting a pseudo sheet structure, to minimize temperature variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thin electrodes such as metal wires are used to improve flexibility of the wiring sheet, then flexibility is improved, but resistance value increases causing temperature variation
Solution Approach 1:
The conductive linear bodies are configured with varying resistance values along their length, with the resistance decreasing from the electrode end toward the opposite end. This local variation in resistance distribution compensates for the high resistance of thin electrodes, ensuring uniform heat generation across the wiring sheet while maintaining flexibility through the use of thin conductive linear bodies
Solution Approach 2:
The invention changes the resistance parameter distribution along the conductive linear bodies by controlling the thickness or cross-sectional area variation. Specifically, the thickness decreases from the electrode end to the opposite end, creating a resistance gradient that balances the overall resistance and reduces temperature variation while allowing the use of thin, flexible electrodes
2Reliability
If the resistance value of conductive linear bodies is reduced to minimize temperature variation, then temperature uniformity is improved, but heat generation efficiency decreases
Solution Approach 1:
Different portions of the conductive linear bodies have different resistance values, with higher resistance near the electrode end and lower resistance toward the opposite end. This local quality variation allows the system to maintain adequate overall resistance for heat generation while distributing the resistance to minimize temperature variation
Solution Approach 2:
The resistance parameter is optimized by controlling the thickness distribution along the conductive linear bodies. The thickness is designed to decrease from the electrode end to the opposite end, creating a resistance gradient that simultaneously achieves temperature uniformity and maintains heat generation efficiency through balanced resistance distribution
3Reliability
If the thickness of conductive linear bodies is increased to reduce resistance, then resistance value decreases improving temperature uniformity, but flexibility and thinness are compromised
Solution Approach 1:
The conductive linear bodies have non-uniform thickness distribution, being thicker at the electrode end and thinner toward the opposite end. This local quality variation allows the use of thin overall structure for flexibility while maintaining adequate resistance characteristics through the thicker portion near the electrode
Solution Approach 2:
The thickness parameter is varied along the length of the conductive linear bodies to optimize both flexibility and temperature uniformity. By making the thickness decrease from the electrode end to the opposite end, the design achieves a resistance gradient that balances temperature distribution while maintaining the thin, flexible overall structure
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
The design effectively reduces temperature variation by balancing resistance values across the conductive linear bodies and electrodes, ensuring uniform heat distribution and efficient heat generation.
Implementation Method 1
when electric current is applied to the wiring sheet for heat generation
Data Source
AI summary
A wiring sheet includes: a pseudo sheet structure including a plurality of conductive linear bodies arranged at intervals; a pair of electrodes; and a first power feeder provided for one of the electrodes and a second power feeder provided for the other of the electrodes. Assuming that the number of the conductive linear bodies is N, a resistance value of a n-th conductive linear body counted from a side at which the first power feeder and the second power feeder are provided is rn, and a resistance value of the electrodes is R, all of conditions represented by numerical formulae (F1), (F2), and (F3) below are satisfied. (F1): r1/R≤300 (F2): rn+1≤rn (In the formula (F2), n is an integer of 1 or more) (F3): 0<r1−rN.