Abstract: The present invention relates to an electro-optical converter with storage facility.The converter is constituted essentially by a panel comprising a substrate covered by two dielectric layers, cells containing a gas being made in said substrate and two sets of electrodes arranged on said dielectric layers, one of the dielectric layers being a flexible diaphragm capable of local and permanent deformation under the action of electrostatic forces.The invention is more particularly intended for the recording of optical information.

Abstract: A target for ultrasonic camera comprising, applied to a substrate, a pyroelectric retina covered, in the present example, with a layer which absorbs incident ultrasonic waves; the temperature rise due to said absorption produces in the retina a charge relief read out by means which depend upon the selected device, for example an electron beam as in the case of the known pyroelectric targets.

Abstract: A matrix for a gas discharge display panel, consisting of a plate, made of glass for example, comprising on each of its large faces, an array of parallel grooves; said two groove array are at right-angles to one another and are sufficiently deep for the matrix to be perforated from one side to the other, at the zones of intersection of said groove arrays.Such a matrix, arranged between two slabs, suitably separates the display cells from the electrical point of view, whilst still allowing them to communicate with one another this being an advantage where manufacture and "conditioning" of the panel are concerned.