Abstract: An improvement in a method of making a luminescent screen structure for a cathode-ray tube is disclosed. The tube has a faceplate panel and an apertured color selection electrode in a predetermined position spaced from the panel. A photosensitive composition is coated on a surface of the panel. The solubility of the composition is altered when exposed to light through the electrode. The improvement comprises sensing the strength of a magnetic field passing through the electrode and adjusting the time and/or intensity of the exposure light as a function of the sensed strength of the magnetic field.

Abstract: A thin layer of semiconductor material with an extremely smooth surface can be grown on a substrate by liquid phase epitaxy. When the growing solution contacts the surface of the substrate, the substrate is at a lower temperature than the solution. The temperature difference should be less than 1.degree. C and depends upon the desired degree of smoothness. Both the substrate and the solution are then cooled to permit deposition of the layer.

Abstract: A flat panel display device has a cathodoluminescent screen which is bombarded by a flow of electrons. The screen becomes electrically charged due to the electron bombardment. The charge striking various points on the screen is directly related to the image brightness at those points. The flow of electrons to each point is modulated by sensing the electrical charge which strikes the screen's surface at each point and comparing it to the image brightness signal for the display. When a predetermined relationship between the charge and the signal exists, indicating that the proper brightness level has been reached, the electron flow is terminated. The sensing system may be multiplexed to reduce its complexity.

Abstract: A substantially continuous line screen structure pattern is formed in a color television picture tube having an interrupted-aperture shadow mask by applying a photosensitive material to a screen support and projecting light from an extended source through the shadow mask apertures and onto the coated screen support. In a preferred embodiment, the line screen is formed by projecting light from a line source through a shadow mask having a plurality of rows of elongated apertures and onto the coated screen support.

Abstract: A body of semiconductor material of an electroluminescent device is on a gallium arsenide substrate of N type conductivity. The body includes a first region of N type conductivity aluminum gallium arsenide contiguous to a surface of the substrate and a second region of silicon doped P type gallium arsenide on the first region and spaced from the substrate. The P-N junction between the first and second regions is a heterojunction, and is the only heterojunction with the second region. The second region is of a thickness, extending from the P-N junction, in the range of 50 to 200 micrometers. The electroluminescent device is capable of transient response time of 0.2 microseconds or less.

Abstract: The device comprises an enclosure including two spaced apart electrodes for applying an electric field through a film of liquid crystal material between the electrodes. Disposed on one of the electrodes, between it and the liquid crystal film, is a semiconductor material layer. The semiconductor layer has a rectifying or non-ohmic contact with the liquid crystal film, and has an ohmic or low resistance contact with the electrode. The layer has a resistance, when the rectifying contact is reverse biased, greater than that of the liquid crystal film, and, when the rectifying contact is forward biased, less than that of the film.

Abstract: An electron multiplier includes a plurality of staggered parallel dynodes. The dynodes include spaced confinement bumps along their lengths with active areas between the bumps. The confinement bumps and active areas therebetween define a plurality of channels which extend from a cathode at one end of the multiplier. Each channel traverses the staggered parallel dynodes and causes an electron beam to pass therethrough without spreading. The multiplier is useful in a display device which includes a plurality of line sources of electrons, e.g., a plurality of cathode stripes.

Abstract: A series of input pulses are applied to one terminal of an electron tube having at least two electrodes. As a result of interelectrode capacitance, the input pulses produce output pulses at the other electrodes, the output pulses having amplitudes which are substantially less than those of the input pulses. Level detection means is used to detect interelectrode open and short circuits by measuring the amplitudes of the output pulses.

Abstract: A reflective type photocathode of a photomultiplier includes a porous antimony layer in overlay relation to a layer of solid antimony along a supporting substrate.

Abstract: High intensity photoluminescent glasses comprising certain alkali metal-rare earth metaphosphates are suitable for use in display panels, indicator lights, and decorative illumination, etc. These glasses, with a suitable activator, have the formula:[n{(1-x)M.sub.2 0.2xQ.P.sub.2 O.sub.5 }][1-y)Y.sub.2 O.sub.3.yR.sub.2 O.sub.3.3P.sub.2 O.sub.5 ]where n is from two to siz, x is from 0 to 0.2 and y is from 0 to 1; M is an alkali metal; Q is a thallium or silver activator and R is at least one of europium and terbium.

Abstract: A correcting lens for use in the formation of a color picture tube screen has a first effective surface comprised of a plurality of elements separated by boundaries of discontinuity. Each of the elements in the first effective surface is separately contoured to reduce misregister in the tube. The second effective surface, opposite the first, is contoured to additionally reduce misregister in the tube.

Abstract: A cathode ray tube, having a cathode and first, second and third grid electrodes, is biased on to allow an electron current to flow from the cathode to the second grid electrode during a first time period. A first voltage, which is proportional to a sum of gas plus leakage currents flowing in the third grid electrode circuit during the first time period, is applied to a first terminal of a capacitor having first and second terminals. The capacitor is charged to the first voltage by momentarily grounding the second terminal. During a second time period following the first time period, the cathode ray tube is biased off causing cessation of the electron current flow from the cathode to the second grid electrode and of the gas current to the third grid electrode. A second voltage which is proportional to the leakage current flowing in the third grid electrode circuit during the second time period, is applied to the first terminal of the capacitor.

Abstract: An optical waveguide of niobium-doped lithium tantalate single crystal has excellent low loss waveguiding properties with strong electro-optic behavior. The waveguides are made by depositing a film of niobium on a polished lithium tantalate crystal, annealing the crystal so as to diffuse the niobium into the crystal and cooling the crystal.

Abstract: The structure comprises an evacuated envelope that includes a transparent front panel having a cathodoluminescent screen thereon and a back panel interconnectably sealed to the front panel. A plurality of first vanes, spaced from and parallel to each other, are perpendicular to and in contact with the back panel and a plurality of second vanes, spaced from and parallel to each other, are perpendicular to and in contact with the front panel. The first and second vanes are transverse to each other and provide mutual support for each other. Electroding to control operation of the device is formed directly on the vanes.

Abstract: A cadmium selenide base layer is vapor deposited on a substrate and thermally treated to achieve a desired photosensitivity, crystallographic structure, and granularity.

Abstract: A substantially continuous line screen structure pattern is formed in a color television picture tube having an interrupted-aperture shadow mask by applying a photosensitive material to a screen support and projecting light from an extended source through the shadow mask apertures and onto the coated screen support. In a preferred embodiment, the line screen is formed by projecting light from a line source through a shadow mask having a plurality of rows of elongated apertures and onto the coated screen support.

Abstract: A holographic recording medium comprising a conductive substrate, a photoconductive layer and an electrically alterable layer of a linear, low molecular weight hydrocarbon polymer has improved fatigue resistance. An acrylic barrier layer can be interposed between the photoconductive and electrically alterable layers.

Abstract: The sensitivity of organic volume phase holographic recording media comprising an .alpha.-diketone in an acrylic polyester polymer can be improved by heating the recording media during or after recording.

Abstract: A laser device has a plasma discharge region for dissociating a diatomic gas into atoms. A nozzle connects the plasma discharge region with an optical cavity. The nozzle expands the plasma accelerating it to a supersonic velocity as it passes from the discharge region into the optical cavity. As the plasma passes through the nozzle, the dissociated atoms are recombined into molecules in a metastable energy state. The nozzle includes a gas injector for introducing a lasing gas into the plasma flow through the nozzle.

Abstract: An evacuated envelope having therein a vertical by horizontal matrix of cells. Each cell includes a line electron source; a digital modulation section; an electron accelerating and focusing region; and a cathodoluminescent phosphor screen. The digital modulation section includes a modulation mask disposed between the line electron sources and the electron accelerating and focusing region. The modulation mask comprises a metal sheet having a plurality of slots therein. Each slot is aligned within a cell and is surrounded by a sensing pad disposed on a surface of the modulation mask which faces the line electron sources, and by a modulation electrode disposed on the opposite surface. A digitally pulsed flow of electrons, produced by the line electron sources, is directed toward the modulation mask. A series of digital voltage pulses are applied to the modulating electrodes.