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 is to establish a three-dimensional mapping of the external surface of the user's head.

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: An optical system for presenting an image to a user. The system includes an image source and an optical channel transmitting the image to the user's eye. It also includes an illumination of the ocular fundus and an imaging of the illuminated ocular fundus, both using part of the optical channel. The system enables an analysis of the eye retina observing an image. It also enables depending on the eye position, an adaptation of the visual image presented. If the system is partially mounted in a headset, it enables the presentation of the image to a mobile user.

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: An optoelectronic device designed to facilitate the piloting of an aircraft under conditions of poor visibility, at take-off and in the event of an interruption of approach procedures through a wave-off maneuver. It consists of a collimator displaying, in addition to the artificial skyline, the aircraft model and the ground speed vector, two take-off and wave-off slope scales inclined symmetrically along the arms of an X laid on the artificial skyline and intersecting at a value of pitch attitude called a safety pitch attitude to be maintained in the event of engine failure, a local horizon locked into the aircraft model and two pointers that identify the safety pitch attitude and frame the artificial skyline when the pitch attitude of the aircraft corresponds to the safety pitch attitude. Through these new graphic symbols, the pilot can examine the pitch attitude of the aircraft and its roll attitude without taking his eyes off the aircraft model.

Abstract: An instrument system to make settings and verify that the pupil of an eye of a wearer of a helmet designed to receive a piece of optoelectronic equipment itself having a pupil truly coincides with the wearer's pupil, wherein the instrument system includes first and second optical devices whose position with respect to the helmet is fixed, and a first screen and a second screen E.sub.1 and E.sub.2, each including a reference-marking test pattern, the position of the helmet with respect to the wearer being accurate only if the image of the wearer's eye through the first optical means and the image through the second optical means, of a target on which the wearer's line of view is fixed, are respectively well-positioned with respect to the test patterns of the screens E.sub.1 and E.sub.2. In the preferred embodiment, the screens E.sub.1 and E.sub.2 are merged into a single screen E through an optical device partially common to the first and second optical devices.

Abstract: A dynamic audio-video interconnection system for connecting together at least one television receiver and a plurality of peripheral units in home audio-visual installations. By means of a remote-control keyboard, the user transmits interconnection orders which are processed by a microprocessor in order to actuate electronic switches which effect the desired interconnection.