Light Emitting Device Frame Member Bonding
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Solution Overview
Problem
Light emitting devices using a light-transmissive member such as glass over a ceramic package face issues with cracking due to thermal expansion differences, leading to unreliable adhesion and potential material limitations for the light-transmissive member.
Innovation Solution
A light emitting device design where a frame member is bonded to the package, securely holding the light-transmissive member between the package and the frame, preventing cracks and allowing for the use of materials with high light transmittance like quartz or sapphire regardless of thermal expansion coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light-transmissive member is directly bonded to the package, then the structure is simple, but cracks occur due to difference in coefficient of thermal expansion
Solution Approach 1:
A frame member is introduced as an intermediary component between the package and the light-transmissive member. The frame member is bonded to the package and holds the light-transmissive member, preventing direct bonding between the package and light-transmissive member. This intermediary structure eliminates the thermal expansion mismatch issue while maintaining structural simplicity.
2Ease of manufacture
If the light-transmissive member is held only by bonding, then the bonding process is simple, but adhesion reliability is poor
Solution Approach 1:
The support function is segmented between the frame member and the package. The frame member provides mechanical support and holds the light-transmissive member through physical engagement, while the package provides electrical connection. This segmentation allows each component to perform its function optimally without relying solely on bonding adhesion.
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 ensures secure holding of the light-transmissive member, preventing cracks and allowing for the selection of materials with high light transmittance, enhancing the reliability and performance of the light emitting device.
Implementation Method 1
a crack may occur in the light-transmissive member due to a difference in coefficient of thermal expansion between the light-transmissive member and the package
Data Source
AI summary
A light emitting device includes a package having a recess, a light emitting element disposed in the recess, a light-transmissive member covering an opening of the recess, and a frame member bonded to the package. The light-transmissive member is held by and between the package and the frame member.