Chip Thermistor Composite Electrodes Resistance Control
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Solution Overview
Problem
Conventional chip thermistors face challenges in adjusting resistance due to multiple factors such as specific resistance, electrode distance, and shape, especially in small sizes like the 0402 type, making it difficult to control and achieve desired resistance values.
Innovation Solution
A chip thermistor design featuring a thermistor portion made of ceramic material with composite portions containing metal and metal oxides, where external electrodes are connected to the composite portions rather than directly to the thermistor, allowing for easier resistance adjustment by varying the thickness of the thermistor portion and enabling excellent heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If external electrodes are connected directly to the thermistor element body, then the structure is simple, but the resistance control precision deteriorates due to multiple influencing factors
Solution Approach 1:
The patent introduces composite portions as intermediary elements between the external electrodes and the thermistor element body. These composite portions act as mediators that decouple the direct connection, allowing independent optimization of electrode positioning and thermistor geometry, thereby improving resistance control precision without significantly increasing structural complexity
Solution Approach 2:
The patent segments the thermistor structure into distinct functional portions: the thermistor element body and the composite portions. This segmentation allows independent design and optimization of each component, enabling precise control of resistance by adjusting the thermistor portion thickness without being constrained by electrode positioning requirements
2Volume of moving object
If the chip size is reduced to extremely small dimensions like 0402 type, then the miniaturization is achieved, but the resistance adjustment capability deteriorates
Solution Approach 1:
The patent utilizes the thickness dimension of the thermistor portion as an additional degree of freedom for resistance adjustment. By controlling the thickness of the thermistor portion independently of the chip's planar dimensions, the invention enables effective resistance tuning even in extremely small 0402 type chips where lateral adjustments are limited
3Manufacturing precision
If the thermistor portion thickness is increased, then the resistance adjustment range is widened, but the heat dissipation performance deteriorates
Solution Approach 1:
The patent divides the structure into a thermistor portion and separate composite portions, allowing the thermistor portion to be optimized for resistance characteristics (thicker for wider adjustment range) while the composite portions serve as dedicated heat dissipation pathways, thus resolving the trade-off between resistance adjustment range and heat dissipation performance
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 allows for precise resistance adjustment, improved thermal responsiveness, and increased rated power, enabling accurate detection and broader application in various fields, while reducing variations in resistance, especially in small sizes.
Implementation Method 1
the pair of composite portions are arranged on both sides of the thermistor portion so as to sandwich in the thermistor portion between them... excellent heat dissipation
Data Source
AI summary
A chip thermistor 1 has a thermistor portion 7 comprised of a ceramic material containing respective metal oxides of Mn, Ni, and Co as major ingredients; a pair of composite portions 9, 9 comprised of a composite material of Ag—Pd, and respective metal oxides of Mn, Ni, and Co and arranged on both sides of the thermistor portion 7 so as to sandwich in the thermistor portion 7 between the composite portions 9, 9; and external electrodes 5, 5 connected to the pair of composite portions 9, 9, respectively. In this manner, the pair of composite portions 9, 9 are used as bulk electrodes and, for this reason, the resistance of the chip thermistor 1 can be adjusted mainly with consideration to the resistance in the thermistor portion 7, without need for much consideration to the distance between the external electrodes 5, 5 and other factors.