Laser Package Structure for Base Plate Flatness and Hermetic Pin Sealing
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Solution Overview
Problem
Existing laser devices face challenges in maintaining the flatness of the base plate and ensuring reliable electrical connections and sealing due to thermal stress during brazing, which affects the light-emitting performance and structural integrity.
Innovation Solution
The laser device incorporates a frame with flanging portions and holes, and conductive pins that pass through these holes, providing a secure and airtight connection while allowing for thermal expansion and contraction, and uses a light transmitting layer and cover plate with wrinkle portions to absorb stress and enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If brazing is used to connect the frame to the base plate, then structural strength is improved, but thermal stress causes base plate flatness degradation
Solution Approach 1:
The frame is divided into multiple sections with individual flanging portions, allowing each segment to accommodate thermal stress independently while maintaining overall structural integrity. This segmentation prevents stress concentration that would otherwise degrade base plate flatness during brazing.
Solution Approach 2:
The flanging portions are designed with specific geometric parameters (depth, width, curvature) that allow them to deform elastically under thermal stress. By changing the structural parameters of the frame, the system absorbs thermal expansion/contraction forces without transmitting excessive stress to the base plate, thereby maintaining flatness.
2Stability of the object's composition
If the frame structure is made rigid for stability, then structural stability is improved, but adaptability to thermal expansion deteriorates
Solution Approach 1:
The flanging portions are designed with dynamic characteristics that allow them to flex and deform in response to thermal expansion and contraction. While the overall frame maintains structural stability, the flanging portions dynamically adjust their shape and position, enabling the structure to adapt to thermal changes without compromising stability. This creates a semi-rigid system that combines both stability and adaptability.
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 design improves the flatness of the base plate, enhances the reliability of electrical connections, and achieves a low leakage rate of less than 5×10−9 Pa×m3/s, extending the service life and stability of the laser device.
Implementation Method 1
Each of the plurality of conductive pins is electrically connected with a corresponding light-emitting assembly
Implementation Method 2
maintaining the flatness of the base plate and ensuring reliable electrical connections and sealing due to thermal stress during brazing
Data Source
AI summary
A laser device includes a shell, an upper cover assembly, a plurality of light-emitting assemblies, and a plurality of conductive pins. The shell includes a base plate, a frame body, and a first flange. The first flange is bent relative to the frame body and is fixedly connected to the base plate. The upper cover assembly is fixed to the shell. The plurality of light-emitting assemblies are disposed on the base plate. Any one of the plurality of conductive pins is electrically connected to a light-emitting assembly. The frame body includes a plurality of flanging holes. A depth of any one of the plurality of flanging holes is greater than a thickness of the frame body. A portion of the any one of the plurality of conductive pins is located at an outside of the accommodating space through a corresponding flanging hole.