Thermal Hinge System for Head-Mounted Devices
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Solution Overview
Problem
Existing electronic devices, particularly head-mounted devices, face challenges in efficiently transferring heat across mechanical articulations, leading to hot spots and thermal differentials due to inadequate heat dissipation mechanisms.
Innovation Solution
A thermal hinge system is introduced, comprising a thermally conductive living hinge and complementary thermal interface components, which are integrated into mechanical articulations to facilitate efficient heat transfer between hinged portions of electronic devices, such as between the temple arm and front frame of glasses, using materials like pyrolytic graphite and other highly conductive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat transfer mechanisms are used in head-mounted devices, then device structure is simple, but thermal differentials and hot spots occur due to inadequate heat transfer across mechanical articulations
Solution Approach 1:
The patent merges thermal conduction and mechanical articulation functions into a single integrated hinge system. The thermally conductive living hinge combines the mechanical flexibility needed for articulation with thermal conduction pathways, eliminating the need for separate thermal management components and reducing overall device complexity while effectively reducing thermal differentials.
Solution Approach 2:
The hinge system performs multiple functions simultaneously: it provides mechanical articulation for device flexibility, acts as a thermal conduction pathway to reduce hot spots, and maintains structural integrity. This multi-functionality addresses both mechanical and thermal management needs without increasing device complexity.
2Temperature
If thermally conductive materials are added to mechanical articulations, then heat transfer efficiency improves, but device weight increases
Solution Approach 1:
The patent employs a thin-film thermally conductive material within the living hinge structure. This thin film provides adequate thermal conduction pathways to improve heat transfer efficiency while minimizing the addition of weight, as the material is applied as a thin layer rather than a bulky component.
Solution Approach 2:
The living hinge is constructed as a composite material system combining the base hinge material with thermally conductive additives or coatings. This composite approach enhances thermal conduction properties while maintaining the lightweight characteristics of the original hinge material, avoiding the need for heavy pure metal constructions.
3Temperature
If thermal interface components are integrated into hinges, then heat dissipation surface area increases, but manufacturing complexity increases
Solution Approach 1:
The thermal interface components are merged with the hinge structure itself rather than being separate attachments. The thermally conductive living hinge inherently provides the interface between hinged portions, eliminating the need for separate manufacturing and assembly steps for distinct thermal components, thus reducing manufacturing complexity while increasing effective heat dissipation surface area.
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 thermal hinge system effectively reduces thermal differentials, increases the effective surface area for heat dissipation, and prevents overheating by enabling efficient heat transfer across mechanical articulations, thereby maintaining an isothermal condition within the device.
Implementation Method 1
a living hinge extending from a first hinged portion to a second hinged portion and along the mechanical articulation... including a material that is thermally conductive... effectively reduces thermal differentials... enabling efficient heat transfer across mechanical articulations
Data Source
AI summary
A method and system to conduct thermal energy between two hinged portions of an electric device. In examples, the method employs a thermal hinge system configured to transfer or spread thermal energy, and optionally electrical energy, through a mechanical articulation or hinge in an electronic device. A thermal hinge may include a thermally conductive living hinge, complementary and/or mating thermal interface components, or a combination of both.