Optical Engine Flip-Chip Bonding on PCB for Thermal Management
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Solution Overview
Problem
The increasing demand for high-speed data transfer in communication systems exceeds the capabilities of traditional electrical printed circuit boards, necessitating the integration of optical components to convert light to electricity and vice versa, while existing solutions are costly and inefficient in implementation.
Innovation Solution
A printed circuit board assembly featuring an optical engine with optoelectronic components mounted via flip-chip bonding to a supporting printed circuit board, with a heat dissipator to protect and cool the components, and a method that includes forming a hole in the board to lodge the optoelectronic components and fix the optical engine using flip-chip bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical components are integrated into printed circuit boards for high-speed data transfer, then signal integrity and bandwidth are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent divides the optical engine into separate modular components (optical substrate, optoelectronic components, heat dissipator) that can be manufactured independently and then assembled onto the printed circuit board. This segmentation allows each component to be optimized separately, improving signal integrity while reducing overall manufacturing complexity through standardized assembly processes.
Solution Approach 2:
The patent introduces an optical substrate as an intermediary component between the printed circuit board and the optoelectronic components. This optical substrate serves as a dedicated platform for mounting and aligning optical components, simplifying the integration process and reducing manufacturing complexity while maintaining high signal integrity through precise optical pathways.
2Device complexity
If optoelectronic components are mounted directly on the printed circuit board, then device complexity is reduced, but heat management becomes problematic
Solution Approach 1:
The patent merges the heat dissipator with the optical engine assembly, creating an integrated thermal management solution. The heat dissipator is positioned to directly contact heat-generating optoelectronic components, conducting heat away from sensitive areas. This combination maintains assembly simplicity while effectively managing thermal loads.
Solution Approach 2:
The patent addresses heat management by adding a vertical dimension to the design - the heat dissipator extends downward from the optical substrate, creating a three-dimensional thermal conduction pathway. This allows heat to be conducted away from the optoelectronic components in the vertical direction, maintaining a simple planar assembly footprint while solving thermal management challenges.
3Manufacturing precision
If flip-chip bonding is used to fix the optical engine, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent performs preliminary alignment and positioning of the optical engine on the optical substrate before the actual flip-chip bonding process. This preliminary action ensures precise alignment is achieved once, during assembly, rather than requiring complex real-time adjustment during bonding, thereby reducing manufacturing cost while maintaining high alignment precision.
Solution Approach 2:
The patent designs the optical engine and optical substrate with self-aligning features such as mechanical keys, recesses, or registration marks that automatically guide proper positioning during assembly. This self-service alignment mechanism reduces the precision requirements of the bonding process itself, lowering manufacturing cost while maintaining high final alignment precision.
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 solution provides a cost-effective and efficient method to secure and cool optoelectronic components, enhancing signal integrity and reducing interference, while protecting them from heat and pollution.
Implementation Method 1
At least one peripheral border of the carrying face is fixed by flip-chip bonding to at least one border of the supporting face
Implementation Method 2
a heat dissipator covers the optoelectronic components and protects them against pollution
Data Source
AI summary
Printed circuit board assembly including an optical subassembly having a carrying face for carrying at least one optoelectronic component in a such way that light emitted from/directed to is transmitted through the optical subassembly; a printed circuit board having a supporting area for supporting the optical subassembly; wherein the printed circuit board supporting area includes a hole lodging at least one part of the optoelectronic component and wherein at least one part of the carrying face is fixed by flip-chip bonding to at least one part of the supporting area.