Thermistor Electrode Trimming Layout for Stable Insulation
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Solution Overview
Problem
Thermistors face issues with resistance value variation due to trimming, which can lead to short circuits, insulation deterioration, and increased damage, particularly when metal components scatter and adhere to the thermistor body.
Innovation Solution
A resistor unit with electrode layers featuring a removal part for trimming formed in a region excluding the peripheral edge, using laser processing or sandblasting, to adjust resistance values while maintaining insulation and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the peripheral edge of the electrode is trimmed by laser irradiation or sandblasting, then the resistance value variation is corrected, but metal components scatter and adhere to the thermistor body causing short circuits and insulation deterioration
Solution Approach 1:
The trimming process is segmented into two distinct stages: first trimming the electrode peripheral edge, then trimming the thermistor body peripheral edge. This segmentation prevents metal scattering from the first trim from contaminating the exposed thermistor body, thereby maintaining insulation properties while achieving precise resistance value correction
Solution Approach 2:
The electrode peripheral edge is trimmed in advance before the thermistor body peripheral edge is trimmed. This preliminary action removes the electrode material before it could potentially scatter and adhere to the thermistor body during subsequent processing, preventing short circuits and insulation deterioration
2Manufacturing precision
If the thermistor body is trimmed to adjust resistance value, then the resistance value is corrected, but damage to the thermistor body is increased
Solution Approach 1:
The trimming process is divided into two separate operations: electrode peripheral edge trimming followed by thermistor body peripheral edge trimming. This segmentation allows for controlled removal of material with minimal damage to the thermistor body, achieving precise resistance adjustment while preserving structural integrity
Solution Approach 2:
Trimming is applied locally and selectively: first to the electrode peripheral edge, then to the thermistor body peripheral edge. This localized approach ensures that material removal is confined to specific regions needed for resistance adjustment, minimizing overall damage to the thermistor body
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 solution ensures reliable insulation, reduces damage, and stabilizes resistance values, preventing short circuits and insulation deterioration by forming the removal part without exposing the thermistor body, thus enhancing the reliability of the resistor unit.
Implementation Method 1
a removal part for trimming is formed in a region in a formation region of the electrode layer, the region excluding a peripheral edge
Implementation Method 2
using laser processing or sandblasting
Data Source
AI summary
Provided are: a resistor unit; a manufacturing method therefor; and a device provided with a resistor unit. A resistor unit is equipped with a resistor and at least one pair of electrode layers formed on the resistor. In at least one of the electrode layers, a removal part for trimming is formed in a region, from among regions where the electrode layers are formed, that excludes the peripheral edges of such layers. The resistor is a thermosensitive resistor, for example.