Abstract: A fluorescent lamp is disclosed which has a glass bulb with a coating layer of phosphor particles on the inner surface, the phosphor particles being covered by a protective layer consisting of a metal oxide. The phosphor particles are not in direct contact with the glass bulb by virture of the protective layer. Thus, it is possible to prevent the reduction of the mechanical strength of the bulb and reduction of the luminuous efficiency of phosphor due to interaction between the glass bulb and phosphor particles.

Abstract: An improvement is made in a color picture tube having a substantially rectangular slit-aperture type shadow mask mounted therein in spaced relation to a substantially rectangular cathodoluminescent line screen. In the specific improvement, the spacing between adjacent aperture columns near the minor axis of the mask is less at the long sides of the mask than near the major axis of the mask.

Abstract: A full-color, flat-panel, matrix-addressed, electroluminescent display 10 is achieved using red, green and blue phosphors in two layers separated by layers of insulating material 16, 20, 24 and 30 and layers of row 22 and column 14 and 32 electrodes used to excite the phosphors when voltage is applied. One phosphor layer is all one color 18 while the second phosphor layer is composed of alternating, side-by-side stripes of a second color 26 and a third color 28. At each intersection of the row 22 and column 14 and 32 electrodes, a picture element is formed by the two side-by-side color phosphors 26 and 28 as they are superimposed over the single color 18 layer.

Abstract: The electric lamp according to the invention has a mainly tubular glass lamp vessel (1) coated with an interference filter (5) of alternating layers of SiO.sub.2 and of a material having a comparatively high refractive index. The lamp vessel 1 has portions at the area of and near its seals (6,7) having a form deviating from the tubular form and is in situ free from the material having a high refractive index of the interference filter (5). As a result, the lamp vessel (1) has a comparatively high resistance to pressure.

Abstract: According to the present invention, there is provided a color cathode ray tube of multi-purpose use in which as a red phosphor of a color phosphor screen, (ZnCd)S : Ag or (ZnCd)S : Cu phosphor of short decay time is added to rare earth phosphor to have an adding amount of 5 to 30 weight % relative to the total amount of red phosphor so that with respect to the red light emission, the high visibility brightness similar to that of the ordinary color television picture tube can be obtained. Also, since the brightness is lowered rapidly in the early stage of the light emission, the address detection can be carried out positively by, for example, a light pen pick-up.

Abstract: A metal halide high-pressure discharge lamp has a discharge vessel of comt construction, with a fill of mercury, at least one noble gas, typically argon, and a metal halide, with an excess of halogen. The halogen component of the metal halide is formed by iodine and/or bromine. An average light density in excess of 30 ksb, with a specific arc power of between 400 to 5000 W/cm is obtained over an average lifetime of 250 hours with a color rendering index Ra of at least 85 by utilizing cadmium and lithium as the metal component in the metal halide of the fill. Preferably, holmium also is used as a metal for the metal halide, the fill including between 0.1 and 5 mg cadmium, up to 0.05 mg lithium, and 0.05 to 1 mg holmium in a preferred form, halogen and bromine being present in a mol relation of between 0.5 to 2 within the discharge vessel. The excess halogen may be up to about 35 micromol per cubic centimeter of volume of the discharge vessel.

Abstract: A support frame for supporting a tensed mask adjacent to a flat panel tube and wholly within the tube includes an outer flange, a shelf extending from the flange parallel to the flat panel and providing a support surface for the tensed mask and a skirt directed away from the flat panel and adapted to join with the remainder of the tube. The configuration provides a very rigid support frame for resisting deformation when not bonded to the other tube elements, such as during screening of the panel when the support frame alone bears the forces exerted by the tensed mask.

Abstract: A new type of glass, for example for use as a TL-envelope glass which as regards phosphor poisoning and Hg penetration has better properties than the present TL-envelope glasses. Phosphor poisoning occurs in particular upon fusing electrodes and bending and severing and bridging, respectively, during the manufacture of SL and PL lamps. Phosphor poisoning is controlled by incorporating little or no Na.sub.2 O in the glass. In order to nevertheless reach good processing properties, a combination of Li.sub.2 O and K.sub.2 O is used in the glass. The addition of only Li.sub.2 O or only K.sub.2 O does not result in a suitable glass. Hg penetration is controlled by the presence of a large quantity of alkaline earth metal oxides in the glass. The glass according to the invention has a good light transmission. A lamp comprising a lamp envelope of a glass according to the invention shows only a small luminous decline during operation of the lamp.

Abstract: A projection television display tube comprising in an evacuated envelope a display screen on the convexly curved inside of a display window in the wall of the envelope, which display screen comprises a layer of luminescent material and a multilayer interference filter between said material layer and the display window, the filter comprising a number of layers which are alternately high refractive index (H) and low refractive index (L). The filter is composed of at least 6 layers, each having an optical thickness nd, wherein n is the refractive index of the material of the layer and d is the thickness, which optical thickness is between 0.2.lambda..sub.f and 0.3.lambda..sub.f, wherein .lambda..sub.f is equal to p x .lambda., wherein .lambda. is the desired central wavelength which is selected from the spectrum emitted by the luminescent material and p is a number between 1.18 and 1.32.

Abstract: An image display including a viewing screen comprising spaced elemental image areas and a light-absorbing matrix of partially-graphitized carbon black adjacent these areas. The matrix may be made by overcoating a stencil and stencil support with an aqueous slurry of the carbon black, drying the overcoating, and then removing the stencil and overlying overcoating.

Abstract: A so-called "solar-blind" photomultiplier tube includes an envelope having a sidewall and an input faceplate formed from an ultraviolet transmitting filter. A photoemissive cathode is disposed within the envelope for providing photoelectrons in response to radiation incident thereon. The cathode has an intrinsic responsivity extending from the near-ultraviolet portion through the visible portion of the electromagnetic spectrum; however, the filter faceplate transmits only the ultraviolet portion of the spectrum to the photoemissive cathode. The combination of the filter faceplate and the photoemissive cathode therefore limits the tube to a responsivity within the wavelength range of about 300 to less than 400 nanometers.

Abstract: The invention relates to improved strengthening means for a substantially planar one-piece electrode component utilized in an in-line multi-beam CRT electron gun assembly. Advantageous ruggedizing properties are achieved by discretely formed longitudinal channels oriented along the sides of the component with defined ledge portions extending outward therefrom; beneficially dimensioned supporting projections are formed as integral extensions thereof. A plurality of cooperating mini-channels are included as transversals in the component to provide a markedly improved structure.

Abstract: A small-size discharge lamp includes a glass tube having first and second ends, with an outer diameter thereof being smaller than 5 millimeters and a length thereof being shorter than 300 millimeters. At opposite ends of the glass tube, an elongated filament and an elongated getter are provided adjacent each other and parallel to the axial direction of the glass tube.

Abstract: The pinch seal (12) of an electric lamp (11) is kept during operation at a lower temperature by a metal envelope (10), space between this metal envelope (10) and faces of the pinch seal (12) being filled with a heat-conducting mass comprising metal fibers. A considerable temperature decrease is obtained when the spaces between the oppositely arranged major surfaces (13) of the pinch seal (12) and the metal envelope (10) are filled with metal fibers.

Abstract: A high intensity gaseous discharge lamp employs a discharge medium which emits radiation at multiple, narrow line wavelengths which combine to produce white light. Coatings are applied to the arc tube to prevent emission of certain ultraviolet and infrared wavelengths, and a cylindrical barrier blocks certain long wavelength infrared radiation from being emitted by the lamp.

Abstract: In an image pickup tube comprising a glass bulb, a face plate, a target surface, a mesh electrode arranged in opposition to the target surface, and a mesh holder to support the mesh electrode, the mesh electrode having supported with non-uniform tension at various portions thereof by the mesh holder whereby microphonic noise is attenuated rapidly.

Abstract: Porous agglomerates are made from pure tungsten by sintering fine particles together and mechanically breaking down the mass to form some agglomerates considerably larger than the particles. These agglomerates are mixed with fine iridium powder and sintered to form a porous mass. The mass is machined to the cathode shapes and impregnated with an alkaline earth aluminate. The large agglomerates alloy with the iridium only on their outer surface. Their pure tungsten interior provides the surfaces to reduce the alkaline earth oxide to the metal which activates the cathode.

Abstract: A cathode cup structure for a high voltage x-ray tube having a base formed of a weldable material and an exposed upper surface of a non-weldable material bonded to the base. The upper surface may be machined from a block of graphite to form an appropriate cathode cup structure configuration and then bonded to a base formed of TZM using a platinum brazing compound. The graphite upper surface may be coated with pyroltic carbon to reduce dust or alternatively, may be formed of a composition of silicon carbide graphite to minimize dusting problems. The graphite composition of the upper section of the cathode cup minimizes the risk of welding of an electron emissive filament passing through the cup structure.

Abstract: A tungsten-halogen lamp has a ruggedized mount structure employing tri-partite lead-in wires sealed in a soft glass stem and a hard glass capsule. Heavier intermediate sections provide support while the proximal and distal portions are different materials selected to form hermetic seals with the hard glass and soft glass.

Abstract: A color selection electrode in a color display tube is suspended in the corners of the upright edge of the tube's display window by means of flat resilient elements pivotally connected to the corners of the color selection electrode. The flat resilient elements are urged against respective supporting elements in the corners of the display window by separate spring elements.