Patents Assigned to Thomson-CSF
  • Patent number: 5282073
    Abstract: In a system of optical communications that can be used by air or space vehicles, each station comprises at least one optical system covering a half space, this system comprising two twinned optical devices to respectively form two distinct reception channels: a first reception optical channel for the initialization, in space, of the direction of communication; a second optical channel for the reception of the contents of the communication. One of the two optical devices is also used to form a transmission channel for the initialization and then for the communication in the direction of communication. The setting up of communication is done in three steps, respectively target designation, iterative bilateral acquisition and interstation communication.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: January 25, 1994
    Assignee: Thomson-CSF
    Inventors: Martin Defour, Georges Coudrec, Remi Fertala, Benoist Grossmann
  • Patent number: 5282104
    Abstract: A magnetic reading device, of the type comprising multiple magnetic read heads, incorporates read heads each formed by a magneto-resistance element having a resistance which varies as a function of an outside magnetic field. The magnetic reading device comprises a network of line conductors intersected with a network of column conductors to form intersections at which a read head is provided. The first and second ends of each magneto-resistance element forming the read heads are respectively connected to a line conductor and to a column conductor of the corresponding intersection, and a control voltage is applied to the line and column conductors by a switching element for each line conductor, column conductors being connected to a current sensor. A simplification of the control of read heads results from this arrangement, while avoiding the effect of the heads not selected on the variations of current coming from the selected heads.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: January 25, 1994
    Assignee: Thomson-CSF
    Inventors: Jean-Marc Coutellier, Thierry Valet, Francois X. Pirot, Joseph Colineau
  • Patent number: 5279165
    Abstract: Disclosed are a method and a device to measure wind-related stresses in a rotating system. It is based on the studies made by the Applicant which have shown that the power given by the motors driving the system rotationally are a function of these stresses. A measurement of the power, or of any quantity characteristic of this power (such as current, cos.phi. pressure, etc.) therefore enables a simple measurement of the wind-related stresses. If we set a limit value of power (or of a characteristic quantity) related to the limit velocity of the wind beyond which the forces to which the system is subjected are excessive, it becomes easy, by way of a comparison, to obtain a condition for the operation of the motors. The disclosure can also be used, in systems carrying out an angle measurement, to make a correction of this measurement.
    Type: Grant
    Filed: June 22, 1992
    Date of Patent: January 18, 1994
    Assignee: Thomson - CSF
    Inventors: Alain Bizot, Andre Peyrat
  • Patent number: 5278915
    Abstract: The method consists in effecting a hierarchical decomposition of the image by levels of resolutions, (I.sub.31, I.sub.32, I.sub.33 ; I.sub.21, I.sub.22, I.sub.23 ; I.sub.11, I.sub.12, I.sub.13 ; I), in estimating an overall movement at the coarsest level of resolution and in refining the estimate (I.sub.31, I.sub.32, I.sub.33) in each level as the resolution increases.
    Type: Grant
    Filed: February 4, 1992
    Date of Patent: January 11, 1994
    Assignee: Thomson-CSF
    Inventors: Bertrand Chupeau, Michel Pecot
  • Patent number: 5274680
    Abstract: A device for the transmission of synchronous information by an asynchronous network, notably an ATM type network, where information elements are conveyed by packets of data bits between a transmitter unit and a receiver unit. Each of these packets is formed by an information cell comprising a header carrying an address and a useful field bearing the information to be transmitted. The transmitter unit and the receiver unit work with each other in a synchronous mode on the basis of respective plesiochronous local clocks. The device detects and compensates for a lengthy fading of transmission of the flow of information cells received by the receiver unit. The device also detects and compensates for a loss or insertion of cells in the flow of information cells received by the receiver organ.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: December 28, 1993
    Assignee: Thomson-CSF
    Inventors: Gerard Sorton, Thierry Grento
  • Patent number: 5273929
    Abstract: A power transistor comprises, on a layer of insulator, a layer of a semiconductor material comprising several zones with N+, N and N+ doping. The N doped zone corresponds to the gate zone. The N+ doped zones correspond to the drain and source zones. A method for the making of such a transistor is also disclosed. Application: the making of a field-effect transistor with improved heat dissipation.
    Type: Grant
    Filed: August 19, 1991
    Date of Patent: December 28, 1993
    Assignee: Thomson-CSF
    Inventors: Jean-Pierre Hirtz, Didier Pribat
  • Patent number: 5272106
    Abstract: Disclosed is a method for the making of an optoelectronic device such as buried lasers in which the different layers of the device are chiefly made during a single step of epitaxy by means of a removable mechanical mask.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: December 21, 1993
    Assignee: Thomson-CSF
    Inventors: Jean-Pierre Hirtz, Jean-Charles Garcia, Philippe Maurel
  • Patent number: 5272496
    Abstract: Disclosed is an image projector wherein the illumination of an LCD matrix screen is done by means of two polarized beams coming from a same light beam that has no particular direction of polarization. The two polarized beams are obtained by a polarization separator whence these two polarized beams emerge with a square section. On the one hand, each polarized beam goes through at least two juxtaposed convergent lenses by which it is converted into two sub-beams which project their illumination spot on the matrix screen and, on the other hand, each convergent lens has a surface with a shape that is homothetic with the shape of the matrix screen. The luminous efficiency is thus improved through the matching of the shape of the section of the non-polarized light beam with that of the matrix screen.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: December 21, 1993
    Assignee: Thomson-CSF
    Inventors: Christophe Nicolas, Brigitte Loiseaux, Jean-Pierre Huignard
  • Patent number: 5272551
    Abstract: The present invention concerns an optical system for the reproduction of color video images, comprising a source of illumination (1), an electro-optical modulator (3) formed from pixels associated with the colors red, green, and blue respectively, and optical collimation means (2) used to illuminate the entirety of the modulator. This system further comprises a series of wavelength-selective holographic lenses (6) making it possible to focus the light of each red, green, or blue component on the associated pixels of the modulator. Applications to videoprojectors and direct viewing.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: December 21, 1993
    Assignee: Thomson-CSF
    Inventors: Jean-Claude Lehureau, Jean-Pierre Huignard
  • Patent number: 5270722
    Abstract: A radiating element has two superimposed patches separated by a dielectric layer. At least the lower patch has two opposite concave sides to allow space for the feeder conductor to pass to the other patch without increasing the overall dimensions of the element.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: December 14, 1993
    Assignee: Thomson-CSF
    Inventor: Xavier Delestre
  • Patent number: 5271036
    Abstract: A method for recognizing modulation of radioelectric transmissions from instantaneous spectra of transmission observed in a determined frequency band by a Fast Fourier Transform spectrum analyze is disclosed wherein the method involves the calculation of a plurality of parameters for each transmission spectrum line which is observed. The parameters include the calculation of a mean amplitude of all the lines k of the spectrum contained in the determined frequency band and the calculation of a signal-to-noise ratio as well as a standard deviation in amplitude of each line of the spectrum. Also calculated is a coefficient of correlation COR(k,k) of amplitude of each line k with the homologous lines of the transmission spectrum contained in the determined frequency band.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: December 14, 1993
    Assignee: Thomson-CSF
    Inventors: Bruno Lobert, Bruno Sourdillat
  • Patent number: 5270725
    Abstract: The antenna is a rotating dipole antenna comprising a base, a rigid support rotatably mounted on the base, a plurality of wire dipoles fixed to the support, and means to feed each dipole with electrical energy from a first end of said dipole. In order to provide for the efficient fastening of the dipoles, the rigid support extends before at least the first end of each dipole, and this first end is fixed directly to the rigid support while the second ends of the dipoles are either fixed directly to the rigid support or connected to it by a catenary supported on the support. The antenna can be applied to the designing of power antennas in the decametric wave range.
    Type: Grant
    Filed: December 27, 1991
    Date of Patent: December 14, 1993
    Assignee: Thomson-CSF
    Inventors: Francois Ursenbach, Jean-Marc Martin
  • Patent number: 5271043
    Abstract: A device and a method for the transmission or storage of data optimizing the use of the pass-band. Also, a method for transmission by phase modulation. In order to obtain high data throughput rates, the synchronization of a transmission clock with the reception clocks is used. This synchronization is gotten, for example, by transmission of a pseudo-random code and by the convolution or correlation of the received signals with the pseudo-random code. The invention also enables the elimination of multiple echoes by computation. The invention can be applied chiefly to the transmission of radio programs, television broadcasts or digital data.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: December 14, 1993
    Assignee: Thomson-CSF
    Inventors: Yvon Fouche, Guy Desodt, Philippe Elleaume, Gerard Auvray, Jean Anastassiades
  • Patent number: 5266956
    Abstract: The distance between the target and the measurement means is segmented into adjacent distance compartments, the first one of which starts at the zero distance. Each distance compartment has an associated energy level obtained by the demodulation of the delay measurement signal resulting from the product of correlation between the emitted signal and the received signal reflected by the target. The disclosed method consists in creating two distinct aliasings of the spectrum of the signal measurement signal, the energy level of which corresponds to the first distance compartment, these aliasings being achieved on the part of the spectrum corresponding to negative distances. This two distinct aliasings make it possible to obtain two distinct energy levels on the totality of the first distance compartment, and thus enable the measurement of all the distances on this first distance compartment, including the very small distances, even almost zero distances, by comparisons and analyses of the two energy levels.
    Type: Grant
    Filed: October 15, 1992
    Date of Patent: November 30, 1993
    Assignee: Thomson-CSF
    Inventors: Yves Canal, Charles Barre
  • Patent number: 5267076
    Abstract: The invention relates to the obtaining of a structure generating non-linear electrooptical effects, the effects being due to molecules or inter-molecular groupings possessing a non-linear susceptibility and the orientation of the molecules or groupings being induced by an applied electric field. According to the invention, the orientation of the molecules or inter-molecular groupings (5) is obtained by of a dielectric having a permanent polarisation such as an electret (6).
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: November 30, 1993
    Assignee: Thomson-CSF
    Inventors: Dominique Broussoux, Jean-Claude Dubois, Pierre Le Barny, Philippe Robin
  • Patent number: 5264751
    Abstract: In a transducer for surface waves, an alternating succession of transmitter cells and reflector cells is used. The transmitter cells transmit surface waves in phase opposition, leftwards and rightwards. The reflector cells have a reflection coefficient that is in phase opposition between the left-hand side and the right-hand side. The waves transmitted by the transmitter cells interfere with the waves reflected by the reflector cells, destructively in one direction and constructively in the other direction. This enables the making of transducers with spacings equal to .lambda./4 and .lambda./6 only.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: November 23, 1993
    Assignee: Thomson-CSF
    Inventors: Pierre Dufilie, Jean Desbois
  • Patent number: 5264512
    Abstract: The invention is a family of amorphous copolymers, transparent in the visible range, for use in non-linear optical applications. The copolymers are produced by copolymerizing an alkyl methacrylate or an alkyl acrylate or a .gamma. alkyl acrylate halide or an alkyl phenylacrylate or a .gamma. trifluoromethyl acrylate with a monomer containing the entity which generates the second-order non-linear effects.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: November 23, 1993
    Assignee: Thomson-CSF
    Inventors: Pierre Le Barny, Dominique Broussoux
  • Patent number: 5263035
    Abstract: The disclosure relates to an undulator, namely a device generating a transverse magnetic field polarized alternatively North-South and South-North along the path of an electron beam and enabling the direct conversion, in a free electron laser, of a part of the energy of a beam of relativistic electrons into light energy. The undulator comprises a conductor forming, along the path of the electron beam, undulations that wholly or partially induce the transverse magnetic field. To increase the light efficiency, it consists in providing for auxiliary current bypass connectors on said conductor. These auxiliary connectors enable the modulation of the transverse magnetic field as a function of the changing characteristics of the high frequency electrical field which increases during the arrival of a packet of electrons in the optical cavity of the laser owing to the energy yielded by these electrons.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: November 16, 1993
    Assignee: Thomson-CSF
    Inventors: Hubert Leboutet, Michel Simon
  • Patent number: 5262348
    Abstract: Disclosed is a method for the growing of heteroepitaxial layers of monocrystalline semiconductor materials. To this end, on a substrate made of a material of a first type, there is made a seed of a second type of material. This seed is between a face of the substrate and a confinement layer which defines a confinement space with the face of the substrate. A vapor phase epitaxy of a material of the second type is then effected in the confinement space. This material of the second type grows from the seed in the confinement space. The method can be applied to the manufacture of heterogeneous semiconductor structures and to the three-dimensional integration of semiconductor components.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: November 16, 1993
    Assignee: Thomson-CSF
    Inventors: Didier Pribat, Pierre Legagneux, Christian Collet, Valerie Provendier
  • Patent number: 5262788
    Abstract: A data transmission and/or acquisition device and method are disclosed. The said device and method use two cross polarizations of an electromagnetic wave and a magnetic recording device. The invention pertains to phase/amplitude modulation using two phase-modulated signals transmitted on two orthogonal polarizations. At reception, the vector sum of the two signals is added taken. The resultant signal is amplitude-modulated and/or phase-modulated. The invention can be applied especially to television and radio transmitters, radars and telecommunications equipment.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: November 16, 1993
    Assignee: Thomson-CSF
    Inventors: Serge Drabowitch, Yvon Fouche