Thomson-csf

Thomson-brandt

Other

Jean Claude Dubois

Pierre Le Barny

Annie Zann

Gilles Ravaux

Maryse Gazard

Claude Puech

Claude Bricot

Philippe Robin

Francois Le Carvennec

Armand Eranian

Jean Claude Lehureau

Francoise Barre

Bernard Carre

Andre Couttet

Jean Claude Lavenu

Michel Hareng

Brigitte Loiseaux

Serge Le Berre

Dominique Broussoux

Jean Pierre Huignard

Bruno Mourey

Eugene Duda

Jean P Billard

Jean E Picquendar

Lydie Thirant

Pierre Aigrain

Francoise Soyer

Annie Beguin

Francis Garnier

Claude Duchesne

Evelyne Datamanti

Michel Rolland

Louis Giral

Mahmoud Aldissi

Gerard Tourillon

Pierre Leclerc

Guy Decobert

Marie A Abert-Mellah

Michel Marchal

Francois Schue

An infrared detector based on pyroelectric material, of the type associated with a reading circuit prepared on a semiconductor substrate, the substrate also supporting conductive blocks designed to transmit the electrical signals generated by the pyroelectric material towards the reading circuit. Each conductive block corresponds to a picture element or pixel, wherein the detector is formed by a layer of pyroelectric material deposited on that side of the semiconductor layer having the conductive blocks. The pyroelectric material has a thermal conductivity of K&lt;1 W/m..degree.K., a counter-electrode covering the layer of pyroelectric material on the side opposite the conductive blocks.

Infrared detector based on pyroelectric material

In a method of construction of an electrooptical display screen and especially a liquid-crystal screen, a control point of an image element is provided with a coupling element of ferroelectric material between an electrode and a control lead.

Electrooptical display screen and a method of fabrication of said screen

The invention relates to polymeric materials usable in non linear optics. The structure of the material of the invention includes a skeleton to which side chains are attached, the material resulting from the association of a first and a second monomer, the first monomer including a mesomorphogenic group connected to the skeleton by a spacer, the second monomer including a group capable of generating the second harmonic of an electromagnetic wave and also being connected to the skeleton by a spacer.

Mesomorphic polymer material usable in non linear optics

The invention relates to a family of organic compounds of the 1(4 hydroxyphenyl)2(4' cyanophenyl) ethane ester type which have a smectic A type mesomorphic phase, to the mixture obtained from these compounds as well as the method for manufacturing the molecules of this family. The compound of the invention corresponds to the general chemical formula: ##STR1## n being between 1 and 15.

Organic compound having a smectic phase A, and a mixture comprising this

The invention relates to a family of sidechain homopolymers of the polyacrylate type derived from 3-fluoro-4-cyanophenol and exhibiting a mesophase of the nematic or smectic-A type. The polymer in accordance with the invention corresponds to the following general chemical formula : ##STR1## where x indicates the degree of polymerization and 4.ltoreq.n.ltoreq.15.

Mesomorphic side-chain polymers having high dielectric anisotropy and a

The invention concerns a family of thermotropic polymers of the mesogenic the lateral group of which have at least one mesomorphous phase and obtained from a monomer having the general formula: ##STR1## in which R.sub.1 .dbd.CH.sub.3, Cl or H and 2.ltoreq.n.ltoreq.11.

Thermotropic polymers with lateral chains having a chiral structure and

The invention relates to a group of organic compounds of the 1-(4-hydroxyphenyl)-2-(4'-trifluoromethylphenyl)-ethane ester type having a mesomorphous phase of the smectic A type, to the mixtures obtained from said compounds, as well as to the process for producing the molecules of said group. The compound according to the invention is in accordance with the general chemical formula: ##STR1## whereby n can be between 1 and 15.

Organic compound having a smectic A phase, mixture containing said

The invention relates to electrochemical devices and in particular energy storage devices. The object of the invention is the use in such devices of at least one conductive support, covered by a polymer film, obtained by electrochemical polymerization of at least one monomer having at least one aromatic heterocycle with five links containing a single heteroatom, the polymer being in accordance with the general formula: (M.sup.+ X.sup.- y)n. The basic monomer is a pyrrole, thiophene, furan or indole and is substituted by at least one group of the alkyl, alkoxyl, hydroxyl aryl, substituted aryl, halogen, methyl trihalide, cyano, amino or dialkylamino type.

Electrochemical device which can be used for energy storage

The invention relates to a doped polyacetylene film for forming an organic semiconductor or even a conductor of a metallic type. It serves to make the doping more homogeneous and improves the stability over a period of time. The process consists of using as the dopant a salt of an element such as chrome, nickel, iron, titanium, tungsten, or molybdenum belonging to the transition metals, or a salt of an element such as europium or ytterbium belonging to the lanthanides. Doping takes place by immersing the film in a solution having a low dopant concentration, e.g. in toluene, and maintaining the system at low pressure and ordinary temperature for a period of a few days, as a function of the desired doping level and conductivity.

High stability conductive polyacetylene material and process for the

The invention relates to an organic compound obtained by synthesis from 3,5-dihydroxybenzoic acid. The compound according to the invention is in accordance with the following general formula: ##STR1## in which R stands for an organic group of the alkyl, alkoxy or alkyl carboxylate type having 1 to 15 carbon atoms and in which X designates a nitrile or halogene group.

Diphenyl benzoates and its use as a dopant for smectic liquid crystals

This invention concerns a process for producing diffracting phase structures in an interaction medium, which is formed of microballs of material in suspension in a polymerizable liquid. When illumination rings have been recorded by the interference of two light waves, they are fixed in situ by exposing the mixture to ultraviolet radiation.

Process for producing diffracting phase structures

An improved process for forming an embossed pattern through the use of a writing concentrated beam opening holes in a film capable of undergoing residue free evaporation. A layer of photoresist is overlayed with the film and upon being exposed and processed the layer supplies the prospective embossed pattern.

Method of making an embossed pattern on an information bearing substrate

The invention relates to resins used for manufacturing or reproducing masks in electronics. The photomasking composition corresponds to the general formula: ##STR1## in which R.sub.1, R.sub.1 ', R.sub.1 ', R.sub.2, R.sub.2 ', R.sub.2 ' designate alkyl radicals whose principal chain contains from 1 to 10 carbon atoms, the symbols F, Cl and Br which designate the fluorine, chlorine and the bromine bearing indices a, b, c, a', b', and c' representing the number of these atoms which are zero or positive whole numbers, such as m, n, p.

Photomasking composition, process for preparing same and mask obtained

The present invention relates to a family of substances which, in different temperature ranges, exhibit smectic or nematic properties of mesomorphism. Their general formula is: ##STR1## where R designates one of the three radicals: ##STR2## (n being a whole number ranging from 1 to 20) and X designating a halogen (Br preferably) or the nitrile radical C N.

Mesogenic products for liquid crystal cells

The present invention relates to a family of substances which, in different temperature ranges, exhibit smectic or nematic properties of mesomorphism. Their general formula is: ##STR1## where R designates one of the three radicals:

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Paris, France

Jean Claude Dubois