Piezoelectric Resonator Enclosure Step for Brazing Containment
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Solution Overview
Problem
Existing piezoelectric resonator units face challenges in suppressing the spreading of brazing material during manufacturing, which can lead to air-tightness issues and potential electrical shorts.
Innovation Solution
A piezoelectric resonator unit design featuring a first enclosure portion with a curtain-shaped portion having a stepped inner peripheral surface, where the thickness varies to create an accommodation space that captures the brazing material, preventing it from spreading and ensuring hermetic sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is added to the cover or flange to suppress brazing material spreading, then brazing material containment is improved, but device complexity increases
Solution Approach 1:
The curtain-shaped portion introduces a localized structural feature with varying thickness (thicker portion and thinner portion) at a specific location on the enclosure. This local quality change creates an effective barrier against brazing material spreading without requiring complex grooves or additional components throughout the entire structure, thus improving containment while minimizing overall complexity
2Quantity of substance
If the curtain-shaped portion is made thinner to reduce material usage, then manufacturing cost is reduced, but structural strength decreases
Solution Approach 1:
The curtain-shaped portion employs non-uniform thickness distribution with a thicker portion and a thinner portion. The thicker portion provides necessary structural strength and support, while the thinner portion reduces overall material consumption. This local quality variation allows the structure to maintain adequate strength while minimizing the quantity of substance used
Solution Approach 2:
The curtain-shaped portion extends in the thickness dimension of the enclosure, creating a three-dimensional barrier against brazing material spreading. By utilizing the thickness dimension effectively, the design achieves strong containment performance without requiring excessive material in the planar dimensions, thus reducing overall material usage while maintaining structural integrity
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
Effectively reduces the spreading of brazing material, maintaining air-tightness and preventing electrical shorts, while allowing for efficient hermetic sealing of the enclosure.
Implementation Method 1
a brazing material that joins a distal end of the first enclosure portion to the second enclosure portion to hermetically seal the enclosure
Data Source
AI summary
A piezoelectric resonator unit comprises a first enclosure portion that includes a first principal surface portion and a substantially curtain-shaped portion which cooperate to define a first recessed portion. The first principal surface portion has a first flat principal surface and the substantially curtain-shaped portion surrounds the first principal surface when viewed from a normal direction to the first principal surface. A second enclosure portion has a flat second principal surface and cooperates with the first recessed portion to define an enclosure which houses a piezoelectric resonator. A brazing material joins a distal end of the first enclosure portion to the second enclosure portion to hermetically seal the enclosure. An inner peripheral surface of the substantially curtain-shaped portion includes a stepped portion that is defined by adjacent thicker and a thinner portions of the substantially curtain-shaped portion. A surface of the stepped portion is formed of a single material.