Piezoelectric Resonator Package Layout for Corner Space Utilization
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Solution Overview
Problem
Conventional piezoelectric resonator devices face challenges in downsizing due to inefficient use of space at the corners of the package, which limits the reduction in size and flexibility in designing vibrating parts with different properties.
Innovation Solution
A piezoelectric resonator device with a sandwich structure featuring a piezoelectric resonator plate and sealing members with annular-shaped bonding patterns, where the sealing part is positioned along the outer peripheral edge excluding the corners, allowing for maximized internal space and flexible design of vibrating parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing part is formed with a substantially rectangular shape covering the four corners of the package, then the hermetic sealing is ensured, but the space utilization is inefficient and downsizing is prevented
Solution Approach 1:
The sealing part is designed with an asymmetric shape that excludes the four corners of the package, creating an annular or U-shaped configuration. This asymmetric design allows the sealing part to follow the outer peripheral edge while leaving the corner regions open for through holes and electrical paths, thereby achieving both hermetic sealing and efficient space utilization for downsizing.
2Adaptability or versatility
If the sealing part is positioned to maximize internal space, then the degree of freedom in designing vibrating parts is improved, but the hermetic sealing may be compromised
Solution Approach 1:
The sealing part is segmented into multiple regions: an annular sealing region that provides hermetic sealing along the outer peripheral edge, and corner regions that are excluded from the sealing part to accommodate through holes and electrical paths. This segmentation allows the sealing function and space utilization function to be independently optimized without compromising each other.
3Area of stationary object
If the corners of the package are used for through holes and electrical paths, then the space utilization is improved, but the sealing part becomes more complex
Solution Approach 1:
The sealing part is designed with an asymmetric configuration that naturally excludes the four corners, creating a simple annular or U-shaped structure rather than a complex rectangular shape with cutouts. This asymmetric design simplifies the sealing part structure while simultaneously enabling efficient space utilization for through holes and electrical paths in the corner regions.
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 enables the piezoelectric resonator device to be easily adapted to size reduction, enhances the degree of freedom in designing vibrating parts, and effectively utilizes space at the corners for through holes and electrical paths, improving hermeticity and reducing parasitic capacity.
Implementation Method 1
a piezoelectric resonator plate including a first excitation electrode formed on a first main surface of a substrate, and a second excitation electrode formed on a second main surface of the substrate
Implementation Method 2
a sealing part hermetically sealing the vibrating part of the piezoelectric resonator plate is formed so as to have an annular shape in plan view, and furthermore is disposed along an outer peripheral edge of the package excluding four corners of the package
Data Source
AI summary
A piezoelectric resonator device having a sandwich structure is provided. A crystal oscillator includes: a crystal resonator plate; a first sealing member covering a first excitation electrode of the crystal resonator plate; and a second sealing member covering a second excitation electrode of the crystal resonator plate. A parallelepiped shaped package is formed by bonding: the first sealing member to the crystal resonator plate; and the second sealing member to the crystal resonator plate. The package includes an internal space in which is hermetically sealed a vibrating part of the crystal resonator plate including the first excitation electrode and the second excitation electrode. A bonding material hermetically sealing the vibrating part of the crystal resonator plate is formed to have an annular shape in plan view, and is disposed along an outer peripheral edge of the package.