Abstract: An x-ray exposure device comprising a flat and plane rectangular chamber containing an ionizable gas and having walls provided with electrode structures which generate a potential distribution corresponding to that of two concentric spherical electrodes, an insulating foil on which charge carriers resulting from ionization of the gas by the x-radiation and displaceable in the longitudinal direction of the chamber being arranged therewithin.

Abstract: A pyroelectric detector employing a substrate supporting a thin, i.e., 0.5 to 5 .mu.m thick, solid layer of pyroelectric material with an intermediate layer of nucleating material, i.e., a material which is wettable by a solution of the pyroelectric material so that an adherent continuous layer is formed thereon. The pyroelectric layer may be in the form of a mosaic of islands separated by an electrically conductive material covered with an electrically insulating material.

Abstract: An electro-optic device having a platelet of PLZT material, the birefringence of which depends on an electric field. The thickness of the platelet preferably is smaller than the thickness of one grain. As a result of this the sensitivity is large and this permits a low operating voltage in the device.

Abstract: A magnetic device comprising at least one thin layer of a magnetizable material having a preferred direction of magnetization which is approximately perpendicular to the surface of the layer in which magnetic domains are generated, maintained and possibly annihilated in the layer. A domain guiding structure which with a given magnetic field substantially in the preferred direction enables the occurrence of two types of magnetic domains. The area of the largest domain is at least 15% and at most 125% larger than that of the other domains. The device also has means which convert one type of domain into the other type of domain.

Abstract: A magnetic bubble domain device for recording information on a magnetizable recording medium including a shift register filled with a series of bubble domains coded in accordance with the information to be recorded, the whole bubble domain pattern being printed, in combination with a magnetic transfer field, in one time on a recording medium, new information replacing the old information by shifting of the bubble domains in the register.

Abstract: In a two-digit glass indicator tube the cathode segments with their supply conductors are fixed by enamel to the flat rear walls below a frame of sintered glass against which the front wall bears. Bent parts of conductors and electrodes determine the distance between the front wall and the rear wall. Other parts clamp a mica plate on the supply conductors.

Abstract: Electrode for a primary of secondary battery the electrochemically active part of which comprises a porous layer of a hydride of an intermetallic compound which is sintered to a metallic support, the pores being filled with a hydrophylic water-insoluble macromolecular material.

Abstract: A pyroelectric vidicon employs heating means for stabilizing the target temperature.

Abstract: A semiconductor device, in particular a target for use in a memory tube having an optical and electric input and an electric output, having a semiconductor plate of the silicon vidicon type, in which information in the form of charge is stored in an insulating layer present on the diodes and is read non-destructively by scanning a reading grating present on the insulating layer between the diodes by means of an electron beam.

Abstract: A window for an electron tube formed by a semiconductor device having a support of monocrystalline oxide, by a connection layer formed by a barium- or calcium-boroaluminate, by at least one passivating layer, and by an active layer having a constant composition and formed by a semiconductor material of the p-conductivity type.

Abstract: A method of forming in a wafer of infra-red sensitive material a large plurality of infra-red detector elements each comprising a body having a rectangular surface configuration with a pair of low resistance contacts extending on oppositely located curved edges of the body at opposite sides of a sensitive area of the body. A wafer of the infra-red sensitive material is adhered to a supporting body and by a combination of masking, etching and polishing techniques a plurality of elemental body portions of reduced thickness are defined in the wafer having oppositely located curved edges. Thereafter, electrically conductive material is deposited to form the contacts on the surface of each elemental body portion, and finally the elemental body portions and applied contacts are removed from the supporting body.

Abstract: A magnetoresistive detection device for determining the presence or absence of a single-wall magnetic domain at a position in a thin layer of magnetic material in which stable single-wall magnetic domains can be moved, comprising a sensing element of magnetoresistive material which is provided with respect to the layer of magnetic material in such manner that the resistance thereof varies when a single-wall magnetic domain is present at the said position. The device comprises means to produce an alternating magnetic field so as to modulate the size of a single-wall magnetic domain present at the said position, and comprises a filter which passes only interference-free terms of the signal detected by the sensing element.

Abstract: The stabilization of pyrophorous iron powder in a liquid medium can be carried out in a very short time and particularly carefully when the powders are contacted with organic compounds which contain nitrogen bound to oxygen, for example, nitromethane, nitrobenzene or nitrosobenzene.

Abstract: A dispenser cathode for a grid-controlled electron tube in which the emission of surface regions immediately opposite the control grid is reduced by providing projections above the emissive surface of fused, pore-closing portons which have a focussing effect. These projections may be formed by electron beam or laser beam welding.

Abstract: A device for coupling a light source, in particular a semiconductor laser, to an optical fiber in which the light source and the optical fiber are each connected to a cylindrical or part-cylindrical support and a coupling member is provided having two V-shaped grooves enclosing mutually a substantially right angle, in which the cylindrical supports, possibly carried by an additional member, after their mutual adjustment in the V-shaped grooves, are secured to the contact member. One of the supports may advantageously be provided in a V-shaped groove of a cylindrical or part-cylindrical auxiliary member which is secured in one of the V-shaped grooves of the coupling member.

Abstract: A method of manufacturing a magnetizable polycrystalline material having garnet structure for an active element whose magnetic properties can be influenced by exposure to light, in which a powder having garnet composition is compressed to form a body and is sintered in an oxygen-containing atmosphere, the sintered body being afterfired at a temperature between the sintering temperature and 800.degree. C for a period between 1 and 240 hours and under an oxygen pressure which is smaller than the oxygen pressure during sintering.

Abstract: A method of manufacturing an annular, radially anisotropic, permanently magnetizable body substantially free of cracks and having an inner diameter which is at least 0.8 times the outer diameter and consists of a material of the formula MeO.6Fe.sub.2 O.sub.3, Me being barium, strontium or lead in which after a molded from said material in a radial magnetic field, the body is hydrostatically compressed to increase its density prior to sintering.

Abstract: A gas-discharge display device having a number of cathodes connected in groups and at least one common anode. The cathodes are arranged in a row extending parallel to the anode, each group consisting of spaced portions of a respective elongate conductor, the conductors being arranged in a staggered helix-like formation around a common core which has an insulating surface.

Abstract: A magnetic bubble memory employing first and second domain paths. Domains (bubbles) driven by external means in the first path drive those in the second path producing analogs of gearwheels, cam wheels, ratchets, and even an "electronic light newspaper".

Abstract: A silicon diode array camera tube employs a p-n junction to perform gating and provide electronic gain control.