Translucent Brazed Sealing Lid for Hermetic Optical Packages
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Solution Overview
Problem
Optical element packages face inefficiencies in light utilization due to non-transmissive metal frames and complex structures, and adhesive-based sealing methods are prone to deterioration from ultraviolet rays, affecting long-term reliability.
Innovation Solution
A sealing lid made entirely of translucent material, such as glass, using a brazing material made of eutectic alloy for hermetic sealing, which reduces thermal stress and ensures long-term stability without the need for a metal frame, thereby enhancing light transmission and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal frame is used for the lid to ensure hermetic sealing, then sealing reliability is improved, but light transmission efficiency deteriorates due to the non-transmissive nature of metal
Solution Approach 1:
The patent changes the material parameter of the lid from metal to translucent material (glass or ceramic), fundamentally altering the optical properties to enable light transmission while maintaining sealing functionality through brazing technology
Solution Approach 2:
The patent replaces the mechanical adhesive bonding system with a thermal brazing system, using eutectic alloy brazing material that melts at low temperature to join the lid to the package body, providing hermetic sealing without requiring metal frames
2Ease of manufacture
If adhesive is used for joining the lid to the package body, then ease of manufacture is improved, but reliability deteriorates due to deterioration from ultraviolet rays over time
Solution Approach 1:
The patent changes the joining method from chemical adhesive bonding to thermal brazing, using temperature as the activation parameter instead of chemical adhesion, thereby eliminating UV sensitivity while maintaining manufacturing feasibility
Solution Approach 2:
The patent introduces a brazing material made of eutectic alloy as an intermediary substance between the lid and package body, facilitating hermetic sealing through controlled melting and bonding without the reliability issues of organic adhesives
3Reliability
If a combined structure of glass window and metal frame is used, then hermetic sealing is achieved, but device complexity increases and light transmission efficiency decreases
Solution Approach 1:
The patent merges the lid body and sealing structure into a single integrated translucent component, eliminating the need for separate metal frame and glass window assemblies, thereby reducing part count and structural complexity while maintaining hermetic sealing through brazing
Solution Approach 2:
The patent changes the material parameter of the entire lid structure to translucent material (glass or ceramic), replacing the composite metal-glass structure, which simplifies the design and maximizes light transmission while achieving hermetic sealing through brazing
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 solution achieves high efficiency in light utilization and long-term reliability by using a brazing material with a low melting point eutectic alloy for hermetic sealing, reducing the risk of damage and maintaining airtightness, while eliminating the drawbacks of adhesive-based methods.
Implementation Method 1
a plurality of pieces of brazing material made of a eutectic alloy are fused on a joining region
Implementation Method 2
brazing material made of a eutectic alloy are fused on the joining region of the lid main body
Implementation Method 3
a lid main body made of a translucent material through which at least one of visible light, ultraviolet light, and infrared light is transmittable
Data Source
AI summary
The present invention relates to a sealing lid for a package containing an optical element. For the sealing lid, a translucent material such as glass that can transmit light such as visible light is used. The present invention includes a lid main body made of the translucent material. The lid main body includes a joining region having a frame shape corresponding to an outer circumferential shape of the lid main body. A plurality of pieces of brazing material made of a eutectic alloy are fused on the joining region of the lid main body. An arrangement state of the brazing material includes aligning spherical pieces of brazing material continuously to form a frame shape along the joining region.