Thomson-csf

Thomson-brandt

Jean Pierre Lacotte

Claude Puech

Luigi d'Auria

Jean Pierre Huignard

Michel Favreau

Sylvain Kretschmer

Robert Antoine

Raymond Llabres

Jean Paul Peltier

Guy Chevalier

Charles Marchi

Bruno Blondet

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 and apparatus for

The invention relates to a system optically recording information, by the insolation of a photosensitive layer deposited on a substrate, on a track of substantially constant width. The system comprises a device for controlling the energy emitted by the source in response to the non-uniformity of the reflexion coefficient of said surface, said control device being such that the energy actually transmitted to the photosensitive layer is constant when the modulation signal has the value 1.

An optical information recording system in which the energy when

Three superimposed microholograms, corresponding respectively to the luminance, red chrominance and blue chrominance images, are recorded in respect of each color image. At the time of read-out, the illuminating beam is switched, at the rate of the line-scan function, between three separate positions and projects the above images on a single solid state vidicon. The read-out device can be adapted to an ordinary commercial color T.V. receiver.

Method apparatus and record for distributing information in the form of

A cinematographic film to be reproduced by television is driven at constant speed in synchronism with the sweep cycle of one or more camera tubes each positioned to pick up images projected upon a receiving surface thereof whose luminous persistence equals at least a sweep cycle. The film is periodically transluminated, during the retrace phase of the scanning beam, by a light pulse emitted by an electroluminescent diode -- or by a cluster of such diodes operating on different wavelengths -- defining a quasi-pinpoint light source, the diode being excited by an energizing pulse whose length does not exceed the duration of a line scan of the camera tube.

Telecinema system using electroluminescent diodes

Growing community of inventors

Paris, France

Jean Pierre Lacotte