crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0

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crwdns2933797:0Sam Goldheartcrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Sam Goldheart

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-[* black] This carefully shaped metal slab for mounting all the optics and sensors is a surprisingly heavy element for an HMD. This sits right over the bridge of your nose after all—the [guide|106064|VR|new_window=true] [guide|60612|headsets|new_window=true] we've taken apart all used lightweight plastic.
-[* black] It probably makes a great heatsink though. The electronics and IR illumination (likely [https://en.wikipedia.org/wiki/Vertical-cavity_surface-emitting_laser|VCSEL|new_window=true] devices) all produce heat, which needs to be dissipated so the user doesn’t feel hotspots on their face.
- [* black] It may also help keep the waveguides and cameras dimensionally stable over the life of the device. It’s likely the glasses go through an intensive factory calibration process to trim out any optical misalignments that could cause eye discomfort or camera tracking problems.
- [* black] At the same time, the optics appear to be mounted to the frame with a black silicone-like glue. Glass and metal have different coefficients of expansion, which could create unwanted strain that would affect the optics. That black layer may act as a strain relief.
-[* black] The chunky metal chassis may also explain the awkward position of that [guide|112245|magnetic 6DoF sensor|stepid=214858]. The sensor has to be clear of all metal and EM sources, with no conductive obstructions between it and the controller.
+[* black] A cast magnesium block holds all the optics and sensors, and is surprisingly hefty for an HMD. Other [guide|106064|VR|new_window=true] [guide|60612|headsets|new_window=true] we've taken apart all used lightweight plastic.
+[* black] But metal makes a better heat sink, and the electronics and IR illumination (likely [https://en.wikipedia.org/wiki/Vertical-cavity_surface-emitting_laser|VCSEL|new_window=true] devices) all produce heat.
+ [* black] That pink stuff is thermal paste to help dissipate the IR rangefinder's heat.
+[* black] Metal also offers a stiffer mounting place to keep the cameras stable and focused after their rigorous calibration.
+ [* black] Luckily there's also some black silicon-like adhesive that will allow for some flexing to protect the cameras from drop damage.