Thermally Conductive Light Pipe for Heat Sink Optical Signaling
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently dissipating heat while maintaining optical signaling capabilities, particularly in compact modules like QSFP transceivers, where conventional heat sinks and light pipes often compromise either thermal performance or optical clarity.
Innovation Solution
A thermally conductive light pipe assembly is integrated with a heat sink, featuring a metallic layer with higher thermal conductivity than the optically transmissive core, enhancing heat dissipation and optical signaling by conducting and radiating heat away from the heat sink protrusions while maintaining optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional heat sink is used to dissipate heat, then thermal performance is improved, but optical signaling capability is compromised
Solution Approach 1:
The patent merges the heat sink and light pipe into a single integrated assembly where the light pipe is positioned within the heat sink structure. The light pipe receives light from an LED and transmits it through its core to the heat sink fins, allowing the same structure to serve both thermal dissipation and optical signaling functions simultaneously, thus resolving the contradiction between thermal performance and optical capability
Solution Approach 2:
The heat sink assembly is designed to perform multiple functions: dissipating heat through its fins while simultaneously providing optical signaling through the integrated light pipe. The light pipe core acts as both an optical transmission medium and a thermal conduction path, enabling the structure to be universal for both thermal management and visual indication purposes
2Illumination intensity
If a conventional light pipe is used for optical signaling, then optical clarity is maintained, but heat dissipation efficiency is compromised
Solution Approach 1:
The light pipe is constructed as a composite structure with an optically transmissive core surrounded by a thermally conductive layer. This composite design allows the core to maintain optical clarity for signaling while the outer thermally conductive layer provides enhanced heat dissipation capability, resolving the contradiction between optical performance and thermal management
Solution Approach 2:
The light pipe structure assigns different functional properties to different regions: the inner core is optimized for optical transmission with high clarity, while the outer layer is optimized for thermal conduction with high thermal conductivity. This local differentiation of material properties allows simultaneous optimization for both optical signaling and heat dissipation
3Volume of moving object
If device volume is reduced for compact modules, then space efficiency is improved, but heat dissipation capability is compromised
Solution Approach 1:
The light pipe is nested within the heat sink structure, with the light pipe core positioned inside the heat sink body and its output directed toward the fins. This nested arrangement allows the optical signaling function to be embedded within the thermal management structure, achieving compact integration without sacrificing heat dissipation capability
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 extends the operational limits of heat-producing electronic devices by improving heat dissipation efficiency, reducing noise from airflow, and maintaining optical performance without increasing the device's volume or complexity.
Implementation Method 1
The thermally conductive layer may be designed to conduct and radiate heat away from at least a portion of the heat sink protrusions
Implementation Method 2
Heat sinks may dissipate heat produced by electronic devices into a medium, such as air, water, or a coolant/refrigerant
Implementation Method 3
Heat sinks may reach a temperature greater than a cooling medium, in order to transfer heat across a thermal gradient from an electronic device to the medium, by convection, radiation, or conduction
Implementation Method 4
The first light pipe may be configured to transmit, through a first optically transmissive core having a first thermal conductivity, light, received from a first light-emitting diode (LED)
Data Source
AI summary
An assembly for use with a heat producing electronic device is disclosed. The assembly may include a heat sink in thermally conductive contact with a shell containing the electronic device, and a light pipe having a first thermal conductivity and configured to transmit light from a light-emitting diode (LED) to a front side of the heat sink. The light pipe may include at least a portion having a thermally conductive layer with a second thermal conductivity greater than the first thermal conductivity. The thermally conductive layer may cover at least a portion of an outer surface of the light pipe, and be positioned between, and in thermally conductive contact with a portion of the heat sink protrusions. The thermally conductive layer may be designed to conduct and radiate heat away from at least a portion of the heat sink protrusions.