Abstract: A reusable, protective face mask has two detachable filter trays that attach on each side of the mask, a soft elastomeric face seal, and straps to go around the user's head. Exhalations and inhalations can pass through the same filter material. The filter trays can accept arbitrary filter media. A forward-facing port can be used to increase speech intelligibility by transmitting sound through a diaphragm without a prohibitive amount of distortion. Manufacture of the mask is facilitated because the mask body and the other mask components can be produced by injection molding. Decontamination and sterilization are facilitated because the mask can be fully disassembled.

Abstract: A flexure mount is described herein. The flexure mount includes three different flexures laterally offset from one another along a length of the flexure mount. The flexured design of the flexure mount allows for compliance in certain directions to reduce stress buildup normally associated with rigid mounting of dissimilar materials under dynamic thermal environments.

Abstract: The various technologies presented herein relate to positioning one or more devices of an optical apparatus. In a general embodiment, a tube having a threaded external surface is secured to an alignment ball, the alignment ball being located on a pair of bearings. Attached to the tube is a flange comprising a threaded aperture having the same diameter and pitch as the threaded external surface of the tube. As the tube is turned rotationally about its length, the position of the flange is change on the external surface of the tube.