Abstract: The disclosure relates to the ergonomics and safety of head equipment, notably incorporating display devices, intended to be worn by aircraft crew. One of the difficulties in evaluating injury risks associated with the wearing of head equipment is to determine precisely the center of gravity of the actual user's head, since standard head models prove to be too imprecise. The invention proposes a process enabling individualized determination of the center of gravity of the user's head and therefore its precise position relative to the center of gravity of the head equipment. One preferred embodiment of said process consists in using means to establish a three-dimensional mapping of the external surface of the user's head.

Abstract: A compact optical architecture for a wide-field helmet-mounted display includes a one-piece visor and optical relay to convey said the image between an image source and the visor. The visor is formed by a surface generated by revolution having an axis of revolution (&Dgr;) parallel to the ocular axis (&Dgr;oc) and substantially contained in the sagittal plane of the pilot, at the level of the forehead. The optical relay includes a forehead-mounted mirror that is not planar, having an axis of revolution (&Dgr;) that is the same as the axis of revolution (&Dgr;) of the visor, its geometrical parameters being computed in such a way that the envelope of the useful beams propagated between the forehead-mounted mirror and the first beam-formation device of the optical relay upstream from the forehead-mounted mirror are substantially contained in a cylinder with a section substantially equal to the useful surface of the mirror.

Abstract: A compact optical architecture for a wide-field helmet-mounted display comprises especially a one-piece visor, an optical relay to convey said image between an image source and the visor. The visor is formed by a surface generated by revolution having an axis of revolution (&Dgr;) parallel to the ocular axis (&Dgr;oc) and substantially contained in the sagittal plane of the pilot, at the level of the forehead. The optic relay comprises a forehead-mounted mirror that is not plane, having an axis of revolution (&Dgr;) that is the same as said axis of revolution (&Dgr;) of the visor, its geometrical parameters being computed in such a way that the envelope of the useful beams propagated between said forehead-mounted mirror and the first beam-formation means of the optical relay upstream from the forehead-mounted mirror are substantially contained in a cylinder with a section substantially equal to the useful surface of said mirror.

Abstract: An optronic device fitted with a focusing mirror for projection on a visor. A plane mirror is placed between the last active component of the optronic device and the visor. The mirror is attached to a reinforcement of the device by an elastomeric seal that presses the mirror against screws screwed into the reinforcement. The ends of each pair of screws form axes about which it is possible to pivot the mirror. An identical action on each of the screws makes it possible to move the mirror in translation. Adjusting the mirror makes it possible to alter the position of the visor seen by an optical module of the optronic device, and therefore to focus the image on the visor so that it is as sharp as possible. This corrects placement errors of the visor and its curvature defects.

Abstract: A helmet with night vision system. The system includes an image generator, an optical mixing system for mixing the light rays output by the night vision system and the light rays output by the image generator and a fixed optical system downstream of the optical mixing system. All of the night vision system and the optical mixing system can be removed and a substitute optical system can be inserted for daytime vision. The substitute optical system has the same optical characteristics as the optical mixing system, but has a transmission coefficient higher than that of the optical mixing system. The substitute system is optimized for day vision while the mixing system is optimized for night vision. The helmet may be used for pilots of combat helicopters or airplanes.

Abstract: In order to protect the neck of the wearer of a helmet comprising heavy and/or dangerous equipment, the helmet comprises a part that can be jettisoned in the event of an emergency. The jettisonable part is separated from the fixed part of the helmet by the rapid inflation of a cushion between these two parts. The device can be applied especially to helmets worn by the pilots of armed helicopters or aircraft.

Abstract: A protective helmet including a shell equipped with an optronic unit allowing visualization of an image by a wearer of the helmet. Adjustment of a position of the optronic unit with respect to the sight of the wearer is simplified by prior adjustment of an interpupillary distance of the optronic unit.

Abstract: Disclosed is head equipment having a shell with flanks on each side of a plane of symmetry of the shell, an upper part and a rear part, and a rigid structure designed to bear an optronic device. The head equipment comprises linking assemblies to attach the structure and the shell to each other in a locally movable way. The linking assemblies are attached to the structure and to the shell and are capable of changing shape. The linking assemblies may be blocks of elastomer or pins attached to the structure, sliding in cylinders attached to the shell.

Abstract: The disclosure is a helmet, for example a pilot's helmet, including a shell and an attachable structure carrying optronic equipment. To facilitate manual fitting and removal of the structure on the shell by the wearer, the structure is equipped with mobile linkage parts that can take two stable positions, with a mechanism for locking the linkage parts in these positions, an open position used during the initial positioning of the structure on the shell, and a closed position in which the linkage parts lock the structure on the shell. Fitting and removal of the structure is further facilitated by the fact that the linkage parts can be opened or closed simply by pressing manually on two parts mounted symmetrically, one on each side of the shell, and that each position of the linkage parts is maintained by the mechanism for locking.

Abstract: The purpose of this invention is a system to support at least one visor (2a; 2b) on a helmet (1), the visor being mobile on a slide (30a; 30b) between an operational position and a withdrawn position.The system according to the invention comprises, on each side of the helmet (1), a support and guide part (3) including the slide (30a; 30b), and held on the helmet (1) firstly by an attachment device (4), and secondly by a retaining device (5) preventing the part from leaving the helmet (1).In the release position, the attachment device (4) completely releases the part (3). However the part remains attached to the helmet by the retaining device (5) such that it can move to the position from which the visor can be extracted from the slide without hitting against the helmet shell (10).The system in the invention makes it possible to quickly change the visor without the need for tools. It is particularly useful for aircraft or helicopter pilots.