Acoustic Wave Package Structure for Gap Stability Under Epoxy Sealing
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Solution Overview
Problem
Acoustic wave devices face deformation issues due to external forces during the injection-molding process, particularly when sealed with epoxy materials, which can cause the cap member to deform and reduce the gap between the acoustic wave generator and the cap member, leading to potential contact and compromised operation.
Innovation Solution
The acoustic wave device design incorporates a protective member spaced apart from the acoustic wave generator by a support component, with a sealing component that includes a protective member and a support component to maintain a predetermined gap, reducing deformation by providing rigidity and preventing contact during encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acoustic wave device is sealed using epoxy material during mounting, then the device is protected and sealed properly, but the cap member deforms due to injection pressure causing gap reduction or contact between cap member and acoustic wave generator
Solution Approach 1:
A support layer is introduced as an intermediary component between the cap member and the acoustic wave generator. This support layer absorbs and distributes the injection pressure from the sealing epoxy, preventing direct transmission of force that would cause cap member deformation and gap reduction. The support layer acts as a buffer that maintains the predetermined gap while allowing reliable sealing.
Solution Approach 2:
The support layer is positioned in advance between the cap member and acoustic wave generator to provide cushioning against the upcoming injection pressure during the sealing process. This pre-positioned protective structure prevents deformation before it occurs, ensuring the gap is maintained throughout the sealing operation.
2Volume of moving object
If the gap between acoustic wave generator and cap member is reduced to minimize device size, then device compactness is improved, but the acoustic wave generator and cap member may contact each other under external force
Solution Approach 1:
The support layer serves as a mediator that enables smaller gap dimensions while preventing direct contact between the acoustic wave generator and cap member. Even when the gap is minimized for compactness, the support layer provides a protective barrier that distributes external forces and prevents harmful contact, thus maintaining both compactness and reliability.
3Length of stationary object
If the cap member is made thinner to reduce device height, then device compactness is improved, but the cap member becomes more susceptible to deformation under injection pressure
Solution Approach 1:
The support layer acts as a compensating intermediary that allows the cap member to be made thinner for compactness while preventing deformation. The support layer absorbs the injection pressure that would otherwise directly affect the thinner cap member, effectively transferring the load-bearing function from the cap member to the support layer.
Solution Approach 2:
The support layer provides beforehand cushioning to the thinner cap member, protecting it from injection pressure during sealing. This pre-positioned protective structure compensates for the reduced inherent strength of the thinner cap member, enabling compact design without sacrificing deformation resistance.
Data Source
AI summary
An acoustic wave device includes an acoustic wave generator spaced apart from a support layer and disposed on a substrate; a protective member coupled to the support layer and spaced apart from the acoustic wave generator by a predetermined distance; and a sealing component sealing the protective member.