Electronic-Component Container Hermetic Seal Design
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Solution Overview
Problem
In electronic-component containers with direct seam sealing, the variation in the outer circumferential shape of the ceramic package leads to unstable welding regions, causing hermetic sealing failures due to a narrow melt region, and increasing the melting temperature to address this issue can result in brazing material scattering or package breakage.
Innovation Solution
The metal lid is designed with a shape matching the insulating package, featuring a brazing material with a welding portion inside the castellation, and optional cut-away portions to ensure a stable welding region without narrowing the melt area, preventing leakage and maintaining hermetic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the electronic-component container is reduced, then miniaturization is achieved, but the castellation and metallized sealing portion are disposed closer together, causing the melt region to become narrow and leading to hermetic sealing failure
Solution Approach 1:
The patent divides the sealing structure into distinct functional zones: the metallized sealing portion for welding, the castellation for electrical connection, and an intermediate non-overlapping region. This segmentation prevents the melt region from narrowing by ensuring the castellation does not encroach on the welding area, even in miniaturized containers.
Solution Approach 2:
The patent establishes predetermined spacing and positioning relationships between the castellation and metallized sealing portion during the design and manufacturing stages. This preliminary arrangement ensures that when the container is miniaturized, the critical melt region remains sufficiently wide to prevent sealing failure.
2Reliability
If the melting temperature is increased to widen the melt region, then hermetic sealing is improved, but the brazing material scatters or the package breaks due to heat distortion
Solution Approach 1:
Instead of changing the melting temperature parameter, the patent changes the geometric parameters of the sealing structure - specifically the width and positioning of the metallized sealing portion and castellation. This allows adequate melt region width to be achieved through dimensional design rather than thermal parameter adjustment, avoiding brazing material scattering and package breakage.
3Adaptability or versatility
If the outer circumferential shape of the metallized sealing portion varies with the ceramic package, then manufacturing flexibility is maintained, but the welding region becomes unstable
Solution Approach 1:
The patent applies different quality requirements to different parts of the sealing structure. The metallized sealing portion has controlled dimensions and positioning to ensure stable welding, while other parts of the ceramic package can maintain manufacturing flexibility. This local quality control ensures welding region stability without sacrificing overall manufacturing adaptability.
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 stabilizes the placement of the metal lid, prevents hermetic sealing failures, and avoids issues like brazing material scattering or package breakage, achieving a more reliable hermetic seal without increasing melting temperature.
Implementation Method 1
a brazing material is formed on a lower surface of the metal lid, and the brazing material is provided with a welding portion which is bonded with the metallized sealing portion inside the castellation when the metal lid is bonded with the insulating package
Data Source
AI summary
An electronic-component container is provided in which a metal lid is bonded with an insulating package. The container comprises the insulating package having a housing portion for housing an electronic component element having an electrical function, a metallized sealing portion formed around the housing portion and hermetically bonded with the metal lid, and a castellation having a terminal electrode formed at a side end portion thereof, and the metal lid formed in a shape as viewed from the top which is substantially equal to a shape as viewed from the top of the insulating package, wherein a brazing material is formed on a lower surface of the metal lid, and the brazing material is provided with a welding portion which is bonded with the metallized sealing portion inside the castellation when the metal lid is bonded with the insulating package.