Frangible Sensor Fixing Glass for Low-Polarization Strain Relief
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Solution Overview
Problem
Existing glass compositions for strain relief in passive components, particularly those used in electronic devices, face challenges such as high failure rates during separation due to undefined fracture surfaces and polarization effects, especially in lead-free formulations which can lead to inaccurate temperature measurements and electrical instability.
Innovation Solution
A glass composition with reduced sodium and lithium content, specifically less than 1000 ppm lead, SiO2, Al2O3, B2O3, and ZnO, is applied as a continuous layer over connecting wires on passive components, providing strain relief and minimizing polarization effects while maintaining mechanical stability and refractive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-free glass composition is used to protect the environment, then environmental compatibility is improved, but polarization effects increase leading to measurement inaccuracies
Solution Approach 1:
The patent modifies the chemical composition parameters of the glass by strictly limiting sodium content to ≤1.0 wt% and lithium content to ≤0.5 wt%, while adjusting other oxides (B2O3, Al2O3, SiO2, ZnO) to achieve the right balance between environmental compatibility and electrical stability. This parameter optimization reduces polarization effects that cause measurement errors while maintaining RoHS compliance.
Solution Approach 2:
The patent creates a composite glass formulation combining multiple oxide components (SiO2, B2O3, Al2O3, ZnO) with controlled amounts of Na and Li, achieving a material that simultaneously provides environmental protection and measurement accuracy. The synergistic combination of these oxides creates a glass composition that resists polarization while remaining lead-free.
2Ease of manufacture
If glass composition with high elasticity (low Young's modulus) is used to enable defined fracture during separation, then ease of manufacture is improved, but mechanical strength during operation may be reduced
Solution Approach 1:
The patent optimizes the Young's modulus parameter to approximately 45 GPa or less by adjusting the glass composition (ratios of SiO2, B2O3, Al2O3, ZnO), enabling the glass to fracture at predetermined break lines during separation while maintaining sufficient mechanical strength for operational reliability.
3Reliability
If continuous glass layer is applied over multiple structures to relieve strain on connecting wires, then reliability is improved, but complexity of separation process increases
Solution Approach 1:
The patent introduces predetermined break lines that segment the continuous glass layer into separable sections. These break lines create weak planes that guide fracture during separation, allowing the continuous glass structure to be cleanly divided into individual components without damaging the strain relief function or requiring complex separation procedures.
4Ease of manufacture
If glass composition contains higher sodium and lithium content to improve processing properties, then ease of manufacture is improved, but polarization effects increase causing electrical instability
Solution Approach 1:
The patent optimizes the concentration parameters of sodium (≤1.0 wt%) and lithium (≤0.5 wt%) to achieve the minimum content required for adequate processing while maximizing electrical stability. This precise parameter control ensures the glass remains manufacturable without suffering from polarization-induced electrical instability.
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 glass composition ensures low polarization effects, reduced critical cracking during separation, and improved insulation resistance, enabling precise temperature measurements and reliable electrical performance across a wide temperature range without environmental harm.
Implementation Method 1
A glass composition with high elasticity, i.e., a Young's modulus of approximately 45 GPa or less, is particularly advantageous in order to exhibit this fracture toughness.
Implementation Method 2
the glass composition can protect the connecting wires from electrical short circuits caused by contact with a conductive housing
Implementation Method 3
protecting the areas covered by it from potential external influences such as condensed air humidity
Data Source
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AI summary
The present invention relates to glass compositions, in particular fixing droplets, a passive component, a method for producing wired passive components, a passive component obtainable by this method, and the use of such glass composition for strain relief of connecting wires to passive components.