The wearable devices involved an array of PCB and electronics with multiple antennas which were initially sealed into aplastic housing. Thermal testing revealed high temperature issues on the internal components and the exterior surfaces that touch the body. Original designs had a small heat sink for the CPU but its effectiveness in solving thermal issues was unclear.
The challenges of creating a safe and comfortable exterior temperature, facilitating signals to the antennas, and keeping the inside devices cool were presented to the team of Aavid, Thermal division of Boyd Corporation. Within a stipulated time, we were to predict and improve the thermal performance of the glasses in a natural convection environment with plastic casing material over the antenna area.