Quartz Vibrator Dome Cap Inorganic Bonding Stress Reduction
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Solution Overview
Problem
Quartz vibrators face a challenge in maintaining frequency precision due to external disturbances and water-absorbent sealing resins, which allow humidity changes within the sealed space, leading to reduced frequency stability.
Innovation Solution
A quartz vibrator design featuring a dome-shaped cap bonded to a substrate using an inorganic bonding material, with a thinner connecting portion than the side and ceiling portions, and employing a Au/Sn alloy for enhanced bonding and reduced stress, creating a sealed space that suppresses moisture and gas entry, thus maintaining frequency precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sealing resin is used to bond the cap and substrate, then the bonding process is simple, but the sealing performance deteriorates due to water absorption and humidity changes
Solution Approach 1:
The patent changes the material parameter of the bonding agent from organic sealing resin to inorganic bonding material. This parameter change eliminates water absorption issues while maintaining bonding functionality, thus resolving the contradiction between ease of manufacture and sealing performance.
Solution Approach 2:
The patent employs composite material structure by combining the inorganic bonding material with the metal cap and ceramic substrate. This composite approach leverages the advantages of each material - the inorganic bonding material provides moisture resistance while maintaining strong adhesion, resolving the contradiction between simple bonding and reliable sealing.
2Device complexity
If external disturbances such as stress act on the quartz vibrating element, then the device structure remains simple, but the frequency precision deteriorates
Solution Approach 1:
The patent applies local quality by creating a localized stress-free environment for the quartz vibrating element through the inorganic bonding material and dome-shaped cap design. This localized protection against stress disturbances maintains frequency precision without requiring complex overall structural changes.
Solution Approach 2:
The inorganic bonding material and dome-shaped cap structure provide preliminary protection against external stress disturbances before they can affect the quartz vibrating element. This preventive approach maintains frequency precision while keeping the overall device structure relatively simple.
3Stress or pressure
If the connecting portion of the cap is made thinner, then the stress on the quartz vibrating element is reduced, but the structural strength of the cap decreases
Solution Approach 1:
The patent changes the material parameters by using inorganic bonding material with specific mechanical properties that allow the connecting portion to be thinner while maintaining sufficient strength. The material parameter change enables reduced stress transmission without sacrificing structural integrity.
Solution Approach 2:
The composite material system of the inorganic bonding material and metal cap creates a structurally optimized assembly where the connecting portion can be thinner. The combination of materials provides both stress reduction and maintained strength through their complementary mechanical properties.
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 design achieves high frequency precision by reducing external stress and humidity influence, ensuring stable operation and improved sealing with an inorganic bonding material, which is less absorbent and provides stronger bonding than traditional sealing resins.
Implementation Method 1
The cap and the substrate are bonded by an inorganic bonding material
Implementation Method 2
The connecting portion is thinner than the side wall portion and the ceiling portion... reducing external stress
Implementation Method 3
The cap defines and forms a sealed space that seals the quartz vibrating element along with the substrate... suppresses moisture and gas entry
Data Source
AI summary
A quartz vibrator that includes a substrate, a quartz vibrating element, and a dome-shaped cap. The quartz vibrating element is mounted on the substrate. The cap is bonded to the substrate. The cap defines and forms a sealed space that seals the quartz vibrating element along with the substrate. The cap has a side wall portion, a ceiling portion, and a connecting portion. The side wall portion encloses the quartz vibrating element. The ceiling portion is positioned above the quartz vibrating element. The connecting portion connects the side wall portion and the ceiling portion. The connecting portion is thinner than the side wall portion and the ceiling portion.