Arc-Shaped Glass Package Seal for Shear Fracture Resistance
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Solution Overview
Problem
Hermetic packages sealed using laser techniques are prone to bulk fracture when subjected to excessive shear stress, compromising their reliability due to the properties of the sealing material layer.
Innovation Solution
The sealing material layer is designed to protrude in an arc shape, with a specific thickness and width distribution, and composed of bismuth-based glass and refractory filler powder, to reduce the likelihood of bulk fracture under shear stress, ensuring improved hermetic reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If laser sealing is used to hermetically integrate the package base and glass cover, then thermal degradation of the internal device is prevented, but bulk fracture occurs in the sealing material layer when excessive shear stress is applied
Solution Approach 1:
The sealing material layer is designed with an arc-shaped end portion that protrudes laterally, creating a curved geometry instead of a straight edge. This curvature distributes shear stress more evenly across the sealing layer, preventing bulk fracture while maintaining the laser sealing process benefits
2Reliability
If composite powder including glass powder and refractory filler powder is used as sealing material, then hermetic reliability is improved, but the internal device is thermally degraded during sealing
Solution Approach 1:
The patent replaces conventional thermal sealing methods with laser sealing, using optical energy (laser) to locally heat and seal the composite powder material. This allows precise control of heating, achieving hermetic sealing with the composite powder while preventing excessive thermal degradation of the internal device through localized and controlled energy input
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 arc-shaped sealing material layer effectively prevents bulk fracture and enhances the hermetic reliability of the package by distributing stress more evenly and maintaining the integrity of the internal device, such as deep ultraviolet LED devices, during laser sealing.
Implementation Method 1
a hermetic package including a package base and a glass cover hermetically sealed with each other via a sealing material layer
Implementation Method 2
laser sealing has attracted attention in recent years. According to the laser sealing, only a portion to be sealed can be locally heated
Implementation Method 3
an end portion of the sealing material layer protrudes laterally in an arc shape in sectional view... when a shear stress is applied to the hermetic package, bulk fracture is less liable to occur in the sealing material layer
Data Source
AI summary
A hermetic package of the present invention includes a package base and a glass cover hermetically sealed with each other via a sealing material layer, wherein the package base includes a base part and a frame part formed on the base part, wherein the package base has an internal device housed within the frame part, wherein the sealing material layer is arranged between a top of the frame part of the package base and the glass cover, and wherein an end portion of the sealing material layer protrudes laterally in an arc shape in sectional view.