Thomson-csf

Sextant Avionique

Laser Systems and Solutions of Europe

Jean-Blaise Migozzi

Patrick Lach

Jerome Bourguignat

Bruno Barbier

Bruno Godard

Jean-Pierre Gerbe

Laurent Monnier

Jean-Claude Ebert

Francoise Cheysson

Catherine Antier

Claude Maureau

Serge Ediar

An apparatus for irradiating a semiconductor is disclosed. The apparatus has a curved mirror with a reflective surface of revolution, and a point source generating an irradiation beam being incident on the curved mirror along an incident direction. The curved mirror and the point source form a system having an axis of revolution wherein the point source is provided on or near said axis of revolution. The axis of revolution substantially coincides with a straight line projection to be generated on a semiconductor substrate. Additionally, the use of such an apparatus for manufacturing a selective emitter grid, or for irradiating a large area semiconductor surface in a scanning movement, is disclosed.

Method and apparatus for forming a straight line projection on a semiconductor substrate

The device allows to compensate for the aberrations of the collimating and combining holographic optics by using a simplified scheme for the relay optics. Said relay optics comprises six lenses and a window; it is terminated at each end by a plane side and is disposed in a case. Said relay optics and the holographic optical element are determined taking into account average data for the thickness and curvature of the windshield. The accurate compensation for the windshield deviations is made at a closing glass plate whose thickness is varied. The Folding optical element is a simple reflecting plane mirror and has no correcting effect, which permits the translation along the optical axis of said relay optics and the cathode-ray tube generating the luminous image to be collimated.

Head-up display device of holographic type

The device includes a source of white images, a liquid crystal matrix to control the hue and a liquid crystal matrix to control the saturation of the images displayed.

Optimized color display device which uses a matrix to control the hue

The system is designed to be mounted in a air pilot's helmet. It uses a confocal assembly with a first parabolic mirror and a second parabolic mirror, placed downline of a collimation objective which gives a collimated radiation. The first mirror is totally reflective and the second mirror is semi-transparent to simultaneously transmit, by reflection, the collimated radiation and, by transparency, for example the view of the external landscape. These two mirrors are integrated into the ends of a plate with two parallel faces. The collimated radiation penetrates the plate by one of the parallel faces, gets reflected on the first mirror, undergoes a succession of total reflections on the parallel faces and then gets reflected on the second mirror before leaving the plate, still doing so through one of the two faces.

Optical system of collimation notably for helmet display unit

In an optical device for determining parameters that give the orientation of any solid within a given space, a first solid is fitted with at least one single-beam device producing a beam of light rays substantially parallel to a direction u.sub.i known in a coordinate system R.sub.s bound to the first solid, said beam of light rays containing an item of information that enables direction u.sub.i to be determined, and a second solid is fitted with at least one elementary sensor capable of picking up light rays originating substantially from a direction parallel to V.sub.j known in a coordinate system R.sub.o ; each sensor includes means for reading the information in the beam it has picked up when directions u.sub.i and V.sub.j correspond and the information thus read is processed to extract the parameters giving the orientation of coordinate system R.sub.s relative to coordinate system R.sub.o. One valuable application of the invention relates to the orientation of the headset of an aircraft or helicopter pilot relative to the pilot's cabin.

Method and device for determining the orientation of a solid

In an optical device for the display of light data collimated to infinity, an image generator associated with a collimation optical device gives the eye an image collimated to infinity. The light source that illuminates the image generator is controlled so that the position of its illuminating part is such that it gives a narrow beam with an image of this illuminating part centered on the pupil of the eye. This is possible by means of an oculometer that determines the coordinates of the center of the pupil of the eye and delivers a signal enabling an automatic control circuit to adjust the position of the illuminating part of the source accordingly. The device can be applied to pilots' helmets for the display of data overlaid on the landscape.

Optical device for the display of light data collimated to infinity

Disclosed is an optic device designed to enable an observer to look simultaneously at what is normally in his visual field and at a collimated image that is introduced so as to be superimposed on his visual field. The optic device has a plate with parallel faces in which the light rays coming from an image generator, through an access point, get propagated by total reflection on the parallel faces. A slab, formed by a stacking of plane mirrors, reconcentrates the light rays and directs them towards two successive, semi-reflecting mirrors which reflect them partially towards the observation pupil. The semi-reflecting mirrors are in the visual field of an observer's eye placed at the observation pupil.

Optic device for the introduction of a superimposed image into the

The visor makes it possible to obtain in binocular vision a large field of 60.degree. in the vertical plane and 120.degree. in the horizontal plane. In the case of each monocular vision channel, the visor is constituted by: an image generator such as a miniature cathode-ray tube, for example; an optical relay device; a collimation and combination optical system in which are grouped together a holographic mixing plate for transmitting the landscape channel and reflecting the image channel and a biconvex combining device formed by two holographic spherical optical elements employed on the axis for transmitting the two channels with collimation by diffraction of the image channel. A circular axial zone of zero photometric efficiency is produced in the case of each monocular vision channel and compensated by overlapping of the fields in binocular vision and, in a complementary manner, by the construction of mirror holograms providing variable index modulation.

Large-field holographic binocular helmet visor

Disclosed is an optical device designed to enable an observer to look simultaneously at what is normally in his field of vision and at a colllimated image introduced so as to be superimposed on his field of vision, by total reflections in a strip with parallel faces forming an optical guide. This introduction of a superimposed image is done by means of successive, parallel semi-reflecting panels positioned in the strip and treated so as to be reflective at angles of incidence that get ever smaller with distance from the generator that gives the image. The outside scene is seen, by transparency, through the panels. This device especially concerns helmets for pilots in the field of aeronautics.

Optical device enabling the introduction of a collimated image in an

The optical mixer disclosed enables, through optic fibers, a precise superimposition, in a plane of observation, of identical elementary images with distinct chrominance values. It comprises n (n being a whole number greater than 1) display devices to form n monochrome elementary images with different chrominance values on n screens using one and the same original image, and an optical mixing device formed by optic fibers which may be arranged in sheets. These sheets are ordered to form groups of n fibers wherein the fibers of one and the same group terminate, at their first end, respectively at the n screens, in dots of the elementary images corresponding to the same dot of the original image and terminate, at their second end, in the plane of observation, substantially in a dot corresponding to the dot considered, for the group of the original image.

System for the display of color images using an optical mixer with

The visor can be readily mounted on a helmet by virtue of the fact that it dispenses with the need for any optical relay system. Provision is made for a light image generator, an optical combining and collimating assembly in which a holographic flat plate and a holographic spherical plate are grouped together so as to provide a view of the collimated image superimposed on the landscape. The holographic spherical plate is employed off the axis and produces collimation in a pupil zone placed substantially at the focal distance of the apex of the spherical mirror. The hologram of the spherical plate is recorded by means of a digital hologram in order to minimize aberrations. The flat plate can be fairly steeply inclined with respect to the sighting axis and so designed as to reduce the ratio of parasitic reflection of the imaging channel.

Clear holographic helmet visor and process of producing same

The device provided makes it possible to see a collimated light image in relief. It is formed from a conventional collimator assembly comprising a convergent lens at the focal point of which the light representation to be collimated is placed. This light representation may be formed on the screen of a cathode ray tube. The screen is equipped with a micro-lens lattice. Each micro-lens is coupled to at least two adjacent pixels corresponding to the display of the same image point. A divergent optic is placed between the micro-lens lattice and the collimation optic so as to form with a convergent optic an assembly of the teleobjective type and to provide spatial separation of the collimated images and allow separate observation of a first image with the right eye and of second image with the left eye in the eye box.

Growing community of inventors

Orsay, France

Jean-Blaise Migozzi