Thomson-csf

Robert Antoine

Felix Diamand

Raymond Llabres

Guy Bourrabier

Charles Marchi

Claude Bricot

Michel Lacombat

Jean-Pierre Lacotte

Jean Pierre Lacotte

Gerard Robin

Jean C Graffin

Method for the manufacture of flexible disks from engraved moulds by means of a compression press comprising starting with a roll of plastic material and bringing a strip of material between the open plates of a compression press without making a preliminary hole in said strip. A preliminary hole is made during the closing of the plates by means of a first punch matched to a complementary punch, said punches serving as centering means for the two moulds, then by the guidance of the first punch in the complimentary punch for the centering of the moulds with respect to one another. The central hole is cut when the plates are closed by means of the complementary punch which is maintained in the raised position throughout the end of the pressing cycle.

Method for the manufacture of flexible disks

The device of the invention allows a flexible substrate to be applied against the etched matrix with insertion therebetween of a layer of resin, the application of the substrate on the matrix taking place from the center progressively towards the periphery. It comprises support means in the form of a ring cooperating with a deformable resilient cushion of a convex shape so as to give a curved shape to the substrate at the beginning of molding then to effect the progressive application, while ensuring relative centering of the substrate and the matrix.

Device for molding information-carrying disks

Method for the manufacture of flexible disks and apparatus for

A circuit capable of providing the negative resistance heart of oscillators or amplifiers in the 5-20 Gc/s frequency band, comprising a central resonant cavity and one or several peripheral exciting chambers, each containing a push-pull arrangement of two diodes for example three pairs of diodes in chambers arranged at 120.degree. from one another on a circle concentric to the central cavity. The diodes are located at the bottoms of cylindrical exciting chambers communicating with the central chamber through holes situated at the center of each push-pull arrangement. Each pair of diodes is maintained and polarized by a metallic bar which plays, with the walls of the exciting chamber, the role of an impedance transformer between the diodes and the central cavity. The metallic bar is maintained by a polarization rod penetrating the chamber through an insulating passage.

Ultra high-frequency circuit with resonant cavity equipped with pairs of

In order to position a sensitized plate in the image plane of a projection lens, the optical projection system is provided with a set of extensible jacks placed in a circle around the lens, the desired image plane being defined by the ends of the jacks when they are in the outwardly displaced position. The plate can then be placed against the ends of the jacks by means of a spherical-bearing unit which is locked in position, whereupon the jacks are caused to withdraw and the plate can be displaced in the image plane while remaining at the focusing distance. The invention is well suited to the construction of photorepeaters.

Optical projection system equipped with a plate positioner

A circuit for microwave oscillators or amplifiers, yielding the maximum microwave power from negative resistance diodes feeding into one and the same waveguide section. Diodes are arranged in pairs symmetrically at the level of one and the same right section of the waveguide but outside the waveguide cavity. In the case where two diodes are used, these are screwed into clamps arranged in chambers opening into the cavity. Cylinders effect impedance matching between waveguides and diodes and are supported mechanically by a shaft which supplies the direct voltage for the circuit.

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Paris, France

Robert Antoine