Acoustic Wave Generator Encapsulation With Seated Protective Cover
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Solution Overview
Problem
Acoustic wave devices face challenges in maintaining airtightness and protecting the acoustic wave generator from moisture and foreign materials, which can affect their performance and reliability.
Innovation Solution
The acoustic wave device incorporates a support portion with a seating groove and a protective member, along with an airtight layer formed of an inorganic insulating film or thin film, to create a sealed environment around the acoustic wave generator, preventing moisture and foreign materials from entering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective member is added to protect the acoustic wave generator, then reliability is improved, but device complexity increases
Solution Approach 1:
The protective member is embedded within the support portion, with the seating groove formed inside the support structure. This nesting approach allows the protective function to be integrated into the existing support portion rather than adding a completely separate external component, thereby providing protection while minimizing increases in overall device complexity
Solution Approach 2:
The support portion is divided into functional regions including the seating groove for the protective member and the accommodating space for the acoustic wave generator. This segmentation allows each component to perform its specific function efficiently while maintaining a modular structure that manages complexity
2Reliability
If an airtight layer is formed to prevent moisture entry, then moisture-proofing performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The airtight layer is applied locally at critical interfaces where moisture penetration would be most harmful - specifically at the bonding surfaces between the support portion and substrate, and between the protective member and support portion. This localized application approach provides effective moisture protection while reducing the overall manufacturing precision requirements compared to forming a complete encapsulating layer across the entire device
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 configuration enhances the airtightness and bonding reliability of the device, improving its moisture-proofing performance and overall reliability by ensuring the acoustic wave generator operates effectively without external interference.
Implementation Method 1
an airtight layer disposed between the surface formed by the protective member and the support portion and the encapsulating portion. The airtight layer may be configured to prevent moisture or foreign materials from entering the acoustic wave generator
Implementation Method 2
an element having a thin film form resonates a piezoelectric dielectric material deposited on a silicon wafer, a semiconductor substrate, using piezoelectric characteristics of the deposited piezoelectric dielectric material
Data Source
AI summary
An acoustic wave device includes a substrate, a support portion and a protective member. The substrate has an acoustic wave generator formed on a surface thereof. The support portion is disposed on the surface of the substrate, and includes an accommodating space configured to accommodate the acoustic wave generator. The protective member is coupled to the support portion and disposed to be spaced apart from the acoustic wave generator by a predetermined interval. The protective member is disposed in a seating groove formed in the support portion.