Thomson-csf

Le Materiel Telephonique Thomson-csf

Le Materiel Telephonique

Michel A Lacroix

Michel Henique

Pascal Frapin

Bernard F Guy

Projector of narrow field moving images

An apparatus for a visual display in a training simulator. A projector illuminates a convex side of a spherical screen. A concave face of a spherical mirror facing the convex side of the spherical screen reflects the image on the spherical screen to a viewer. A second embodiment projects an image on a first mirror. The projected image is reflected onto a convex portion of a spherical screen. The image on the convex portion of the spherical screen is reflected to a concave mirror facing the convex face of the screen. A viewer sees the projected image on the concave mirror. The first mirror and the second mirror can be formed as one mirror.

Collimated viewing device with off-axis spherical mirror for simulator

The disclosed display device for simulators has an off-axis collimated display system: a spherical screen and a spherical mirror that are fixed to a helmet worn by the user. This device gives a wide horizontal field and a relatively low attenuation of the external view.

Device for the display of simulated images for helmets

In a simulator for helicopters, the images seen are displayed through the bottom windows by means of a system collimated to infinity, including, for each side of the cockpit, a projector (15, 16), a spherical mirror (12, 13) and a screen (17, 18).

Collimated projection system with wide horizontal field, with device to

The disclosed display device for simulators has, for the display of a zone of interest, a visual unit fixed to a helmet, essentially constituted by mirrors and spherical screens and, for the peripheral vision, a system of wide-angle projection on a sphere.

Wide-angle display device for compact simulator

A hydraulic jack for the controlled displacement of a load, such as a platform used in the training of aircraft pilots, has a servo valve normally settable by an error signal Ve from an actuator including a subtractor followed by an amplifier, the subtractor emitting the error signal as the difference between an externally generated position-control signal Vc and a position-feedback signal Vx sent out by the jack. A monitoring device includes an error detector which generates a safety signal AL disconnecting the servo valve from its actuator whenever the position-feedback signal Vx deviates excessively from a reference signal V'x derived from the position-control signal Vc by means of a simulation circuit whose transfer constant equals, in first approximation, that of the servo system encompassing the jack and the actuator. In addition to several cascaded operational amplifiers, the last of which is an integrator representing an electronic model of the jack, the simulation circuit may include a component responsive to a force-proportional output signal Vp from sensors attached to the jack for limiting the dynamic range of an intermediate signal V's supplied to the integrating operational amplifier, the output signal Vp being also degeneratively fed to the subtractor of the actuator to stabilize the operation of the system.

Electronic device for monitoring the operation of a servo system

The invention relates to the simulation of an aircraft's flight controls and particularly the mechanical reactions produced on the pilot's controls. The reaction force is produced by a servo-controlled, hydraulic actuator whose piston moves a distance X which is proportional to the deflection of the pilot's control. A servo signal, whose amplitude is proportional to the component of the reaction force depending on the displacement X, is obtained by digital calculation, filtering and analogue multiplication. The invention can be applied to flight training systems and to artificial feel systems (AFS).

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Velizy, France

Michel A Lacroix