Abstract: A television camera tube having a discrete structure of photosensitive elements provided on an electrically conductive carrier covered entirely with photoconductive material or another resistance material, so that with a suitable potential applied to the carrier a potential distribution occurs having successive saddle points for the scanning beam. Variation and exposure of the discrete photoconductive elements then results in a variation in beam splitting in the saddle points, as a result of which the tube has a greater or smaller extent of natural amplification.The invention relates to a television camera tube having a target which is to be scanned by an electron beam and which comprises a transparent electrically conductive signal electrode and discrete structure of photosensitive elements provided on an electrically conductive carrier.Such a camera tube is known from the U.S. Pat. No.

Abstract: A magnetic device which can be driven by means of electromagnetic radiation and has a radiation-sensitive element consisting of cobalt-doped yttrium-iron garnet. Exposure to electromagnetic radiation produces a decrease of the magnetic permeability of the element which decrease is permanent until the element is demagnetized and occurs at temperatures from 77.degree. K to room temperature.

Abstract: A method of reducing the thickness of a wafer of fragile material, e.g. pyroelectric material, by placing the wafer, supported only at its rim, in a holder filled with a non-corrosive liquid. The holder with the exposed surface of wafer is placed in an etch bath to reduce the thickness of the wafer. The wafer is removed from the etch bath, without removing it from the holder, to measure its thickness, using its index of refraction, which is facilitated by the presence of a bubble in the non-corrosive liquid.

Abstract: In a pyroelectric vidicon, the target is covered with a layer of vacuum compatible material which has a high secondary emission coefficient, a low first cross-over and low conductivity to prevent decomposition of the target.

Abstract: A television camera tube having background illumination provided by a light diffuser in a space between the anode sleeve and an auxiliary cylinder which coaxially projects into the anode sleeve and which is constructed and marked, on the side facing the target, such that parts of the target are half-shade areas of the light diffuser and a signal derived from the target is homogeneous across the entire target in the case of an homogeneous target illumination.

Abstract: A display device, for example, with a liquid crystal, in which all the output terminals are grouped along the edge of one of the supporting plates of the device. The electric connections between an electrode provided on one of the supporting plates and the output terminals provided on the oppositely located supporting plate consists of contact elements in the form of pills which are formed from a kneadable conductive material.

Abstract: A colour-separating prism arrangement having surfaces which adjoin dichroic layers of mutually different colors with either the lower limit of the second dichroic layer which reflects the red light being substantially equal to the upper limit of the first dichroic layer, or the upper limit of the second dichroic layer which reflects the blue light being substantially equal to the lower limit of the first dichroic layer.

Abstract: A sintered, radially anisotropic, permanent magnetizable body consisting of a ferrite of the formula Me0.6 Fe.sub.2 O.sub.3, wherein Me is at least one of the metals barium, strontium and lead. The body has a closed annular shape with an inside diameter which is at least 0.8 times the outside diameter.

Abstract: An atomic absorption spectroscopic apparatus employing a source of focused infra-red radiation and a holder for a sample at the focal point of the source of infra-red radiation in a chamber adapted to be purged by an inert gas and having windows transparent to a beam of monochromatic light, the holder being in path of the light beam.

Abstract: A picture display device having a matrix of direct current gas discharge cells. The panel has a stratified structure and is specially suitable for series production. The electrodes are conductors which are provided on the surface of the flat front plate and rear plate, respectively. The cells are constituted by glass foils which are secured to the front plate and rear plate, respectively, and are provided with holes. The conductors preferably comprise a layer of conductive glass. The conductors are peferably suitable for the direct connection to a connecting plug.

Abstract: A method of manufacturing a formed, ferromagnetic object, particularly an annular memory core, in which a quantity of ferrite powder, a ferrite sol and a polymerized, organic compound are mixed to form an aqueous solution, which is poured out in a thin layer. A solid, elastic gel is formed, from which rings can be punched, which, after sintering, can be used as cores for memories.

Abstract: Measuring cell for determining oxygen concentrations in a gas mixture, which cell comprises two elements made of a semiconductive oxidic material which is doped so as to have n-type and p-type conductivity respectively and which are separated by a metal layer, the electric resistance of the said semiconductive oxide depending upon the oxygen pressure. The cell is used for carburation control in an internal combustion engine.

Abstract: A pyroelectric target for a vidicon is effectively sealed in a vacuum-tight envelope by resiliently mounting in a retainer ring bonded by indium to a window transparent to visible and infra-red radiation. The window is then sealed in one end of an envelope which is evacuated.

Abstract: A method and device for measuring the length of a root canal of a tooth in which a reference signal obtained by placing an electrode or terminal of an oscillator in the gingival tissue and a signal obtained by inserting an electrode or terminal of an oscillator into the root canal are phase locked and mixed in a product detector to produce an electrical quantity indicative of the length of the root canal.

Abstract: A method of manufacturing a magnetizable layer having domains with at most two Bloch walls for a magnetic domain device in which a monocrystalline layer of Y.sub.3.sub.-x La.sub.x Fe.sub.5.sub.-Y Ga.sub.Y O.sub.12, wherein 0.1 .ltoreq. .times. .ltoreq. 0.2 and 1.0 .ltoreq. Y .ltoreq. 1.5 is provided on a monocrystalline substrate and is covered with an SiO-containing layer after which the monocrystalline layer is maintained at a temperature between 300.degree. C and 600.degree. C for some time.

Abstract: An electro-optic picture display and memory device employs a material which has the property of field-induced ferroelectricity such as lanthanum-containing mixed crystals of lead zirconate and lead titanate. Remanent storage is achieved in that certain electrodes on the plate are separated from the signal generator while the signal voltage is still present.

Abstract: Before assembling a gas discharge panel the active surfaces of the chromium-containing electrodes which constitute the cathodes are covered with a layer of sufficient thickness of platinum, aluminum or nickel which can prevent the formation of chromium oxide.

Abstract: A magneto-optic device employing-optic rotation element having a large magnetic circular dichroism (MCD) and consisting of a bismuth-substituted garnet of the composition:R.sub.3-x Bi.sub.x Fe.sub.5-y A.sub.y O.sub.12where R is .upsilon., Nd, Sm, Eu, Gd; 0.2 < x < 2.0; A is Ga or Al and O < y < 1.5; or, A is In or Sc and O < y < 0.8.

Abstract: A display device for a counting mechanism, for example, a clock or a watch. The electrodes for the counting positions, for example, hours, minutes and seconds, are arranged in concentric rings. The electrodes are divided per ring into groups which are interconnected in a special manner. The counter electrodes are arranged in one ring of which each electrode cooperates with one group of each above-mentioned ring of electrodes. The number of external connections of the display device is thus highly restricted.

Abstract: A device for testing magnetic thin layers for defects, in particular "bubble" films in which a magnetic medium in which a recurring pattern of elongate areas magnetized alternately in opposite senses is recorded is moved relative to the layer while the layer is opposite the magnetic medium so that a corresponding pattern of mutually parallel strip-shaped "bubble" domains is formed in the film. Deviations in said pattern are an indication of defects in the film.