Piezoelectric Vibration Component Adhesive Fillet Design
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Solution Overview
Problem
The bonding strength between the substrate and the adhesive in piezoelectric vibrators is insufficient, leading to the lid peeling off during reflow heating, especially when thermosetting adhesives are used, causing pressure increases inside the lid and compromising the hermetic seal.
Innovation Solution
Extending the adhesive layer from the principal surface to the side face of the substrate, using insulating adhesives like epoxy-based or low-melting glass adhesives, and applying them in a fillet form to enhance bonding strength and prevent peeling, while also roughening the side face to improve wettability and anchoring effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermosetting adhesive is used for bonding the lid and substrate together, then hermetic sealing is achieved, but the bonding strength becomes insufficient at high temperatures causing the lid to peel off
Solution Approach 1:
The adhesive layer is extended from the principal surface to the side face of the substrate, transitioning from a two-dimensional surface bonding to a three-dimensional volumetric bonding structure. This dimensional extension increases the total bonding area and provides mechanical interlocking, thereby enhancing bonding strength while maintaining hermetic sealing at high temperatures
Solution Approach 2:
The invention uses a composite structure combining the substrate, thermosetting adhesive layer, and lid into an integrated bonded assembly. The adhesive layer acts as a composite material that provides both hermetic sealing and structural bonding, with its extended geometry combining chemical adhesion with mechanical interlocking effects
2Device complexity
If the adhesive layer is applied only on the principal surface, then the structure is simple, but the bonding area is insufficient leading to peeling under thermal stress
Solution Approach 1:
The adhesive layer geometry is extended from a planar configuration on the principal surface to a three-dimensional configuration that wraps around to the side face of the substrate. This dimensional extension naturally increases the bonding area and provides corner reinforcement without requiring complex multi-component adhesive systems or additional bonding structures
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 significantly enhances the adhesive force between the substrate and the adhesive layer, ensuring a reliable hermetic seal and preventing the lid from peeling off during thermal stress, thus maintaining the integrity of the piezoelectric vibrator.
Implementation Method 1
an adhesive layer that bonds the substrate and the lid together to hermetically seal the piezoelectric vibrator
Implementation Method 2
a piezoelectric vibrator mounted on a principal surface of the substrate
Data Source
AI summary
A piezoelectric vibration component that includes a substrate having a principal surface and a side face, a piezoelectric vibrator, a lid, and an adhesive layer that hermetically seals the piezoelectric vibrator in a space between the lid and the principal surface. The adhesive layer extends from the principal surface to at least a portion of the side face of the substrate.