Abstract: A head-mounted device may include optical assemblies for presenting images to a user. Each optical assembly may have a support configured to support a display, a lens through which an image from the display is presented to an eye box for viewing, and a sensor. Each support may have an opening configured to receive a guide rod along which the support slides to adjust where the optical assembly is positioned along that guide rod. Each guide rod may include a position index such as a strip-shaped index formed from alternating magnetic poles or alternating light and dark regions. A magnetic sensor or optical sensor may monitor the position index as the support slides along the guide rod to determine the position of the support and optical assembly along the guide rod.

Abstract: A fire-resistant gypsum panel comprises: a gypsum core layer comprising set gypsum and a high temperature sag-resistant material including mineral wool in an amount between 0.2% and 3.0% by weight of gypsum.

Abstract: A suspension unit is provided which is removably coupleable to a helmet shell to enhance user safety and helmet functionality. The suspension unit includes: a suspension assembly configured to interface with a suspension attachment scheme of the helmet shell; one or more sensors carried by the suspension assembly and arranged to obtain biometric, environmental, location, motion, impact and/or other data; and a control system carried by the suspension assembly, the control system including at least a power source and a communication module, and being operatively coupled to the one or more sensors to obtain the biometric, environmental, location, motion, impact and/or other data and to transmit, via the communication module, a data signal to a computing device or network based at least in part on said data from which to enhance user safety and helmet functionality.

Abstract: A key assembly including a key support structure, a switch, a base, and a moveable key. A light source, such as an LED, is mounted to the base to provide illumination for backlighting a translucent region disposed in the moveable key. In operation, when pressure is exerted against the moveable key, the moveable key axially translates to operate the switch. When the moveable key is in its at-rest position, light from the light source will be efficiently and uniformly dispersed through the key assembly to backlight the translucent region based on the location of said light source.