Abstract: The present invention provides an improved cathode-ray tube. The neck of the tube envelope is closed at one end by a stem that includes a plurality of electrically conductive pins extending therethrough. The pins are interconnected to various electrodes of the gun by electrical leads that are welded to respective pins. The improvement comprises at least one of the leads having a bend therein that positions a nonwelded portion of the lead between a lead-to-pin weld location and the neck of the tube.

Abstract: An improved method of making a color picture tube shadow mask includes first constructing an apertured flat mask which is formed into a domed contoured mask. The mask has a rectangular periphery with two long sides and two short sides. The mask has a major axis, which passes through the center of the mask and parallels the long sides, and a minor axis, which passes through the center of the mask and parallels said short sides. The mask includes slit-shaped apertures aligned in columns that essentially parallel the minor axis. Adjacent apertures in each column are separated by tie bars in the mask, with the spacing between tie bars in a column being the tie bar pitch at a particular location on the mask. The improvement comprises a first step of calculating the desired tie bar shadow locations at several discrete areas, for a given scan line pitch, as viewed from a distance in front of a viewing screen of a tube.

Abstract: A color picture tube, includes an envelope having a faceplate panel and a tubular neck interconnected by a funnel. A three-color phosphor screen is formed on the interior surface of the faceplate and a multi-apertured color selection electrode is spaced from the screen. An electron gun is disposed within the neck of the tube. The electron gun includes three cathodes and a plurality of spaced-apart electrodes, having substantially aligned apertures therethrough, for generating and directing three electron beams along paths toward the screen. Each of the electrodes is secured to a plurality of longitudinally extending insulative support rods by at least two oppositely disposed, integral attachment elements, each having a distal end, a proximal end and an appendage portion therebetween. The distal end of each attachment elements includes a bifurcated portion including spaced-apart grasping members to facilitate attachment to the support rods.

Abstract: The invention describes a method of manufacturing a color cathode-ray tube having a color selection electrode attached to a plurality of support studs distributed about and affixed to an interior surface portion of a faceplate panel. The manufacturing steps include: attaching a plurality of support means, each of which includes stud-engaging means, and at least one of the stud-engaging means comprising a washer having a stud-receiving aperture therethrough, to the color selection electrode; positioning the color selection electrode within the faceplate panel with the stud-engaging means positioned on the support studs; and, then, welding the washer to the support means.

Abstract: A method for the metallizing of a luminescent screen comprises the following steps:the depositing of at least one luminophor coat, comprising at least one binder, on the inner face of the screen;the depositing of a sub-layer, consisting of at least one aqueous emulsion of a water-insoluble film-forming resin;the drying of the sub-layer and the heating of this screen to a temperature greater than the minimum temperature for the formation of the film;the depositing of a finishing layer;the drying of the finishing layer;the depositing of a metallic coating on the finishing layer, and,the volatilizing of the binders of the luminiphor screen, the sub-layer and the finishing layer, wherein the sub-layer and the finishing layer are made from the same aqueous emulsions of water-insoluble film-forming resins, said emulsions having a film-forming temperature of below 45.degree. C. and giving a continuous, thin, resistant, reflective and hydrophobic film.

Abstract: The present invention provides an improvement in a color display system. The system includes a cathode-ray tube having an electron gun for generating and directing three electron beams along paths toward a screen of the tube. The gun includes electrodes comprising a beam forming region, electrodes for forming a prefocus lens and electrodes for forming a main focusing lens. The system also includes a magnetic field deflection yoke. The improvement comprises means for applying a dynamic signal to one of the electrodes forming the prefocus lens when electron beam current drops below a predetermined level. The dynamic signal is a maximum voltage when there is no deflection of the electron beams and decreases in voltage to a minimum at maximum horizontal deflection of the electron beams.

Abstract: Disclosed are a method for the fabrication of a color television tube as well as a front panel for trichromatic television tubes. The disclosure can be applied to the reception of high-definition television transmissions. According to the disclosure, the front panels designed for a high-definition television tube screen are elements of the group of surfaces defined byZ=.SIGMA.(C(i).multidot.x.sup.j(i) .multidot.y.sup.k(i)Z(i)=Co(i).multidot.F.sup.-(j(i)+k(i)-1)100.multidot.ABS(Zn-Z)<5.multidot.Zdwhere Z is the dimension of a surface of the group, Zn the dimension of a test surface and Zd the dimension of the maximum value of the dimension of the surface. Co corresponds to a reference surface of the group.

Abstract: A method of surface-treating dry-powdered phosphor particles to control the triboelectric charge characteristics thereof includes the steps of providing the phosphor particles with a first coating of silica, dissolving a coupling agent selected from the group consisting of silanes and titanates in a suitable solvent to form a mixture, surface-coating the silica-coated phosphor particles with the mixture to provide a second coating of the coupling agent on the phosphor particles, filtering the surface-treated particles, rinsing the surface-treated particles with the solvent, and drying the surface-treated particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent overlying the silica coating controls the triboelectric charging characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.

Abstract: An antistatic, glare-reducing coating, as for the surface of the viewing surface of a CRT is prepared by (a) warming a glass support surface above room temperature, (b) coating a surface of the warm support with an aqueous solution containing a lithium-stabilized silica sol and an inorganic metallic compound, and drying the deposited coating, (c) heating the glass support surface and the coating to a temperature of about 65.degree. C. for about 30 seconds, and (d) washing and then drying the coating.

Abstract: An electron gun assembly includes a plurality of cathode assemblies and a plurality of spaced successive electrodes mounted on at least two electrically insulative support rods. At least one of the electrodes comprises a deep-drawn substantially rectangular cup-shaped member having a base portion, a supporting flange portion, including a plurality of attachment tabs, and a sidewall extending therebetween. The sidewall includes a plurality of coined welding areas that provide a substantially flat welding surface having structural rigidity for securing studs thereto to facilitate attachment of the electrode to the support rods.

Abstract: An improved method of making a color picture tube electron gun includes the selection and assembly of a plurality of cathodes and a plurality of electrodes longitudinally spaced from the cathodes. The improvement comprises at least three additional steps. First, the amount and direction of electron beam misconvergence at the tube screen, as caused by the thermal expansion of each individual electrode during electron gun warmup, is determined. A first group of electrodes will cause misconvergence in a first direction, and a second group of electrodes will cause misconvergence in a second direction. Second, the individual contributions of the electrodes to misconvergence during tube warmup are summed. The net effect of thermal expansion of the entire electron gun is a misconvergence in the first direction.

Abstract: The present invention provides an improvement in color picture tubes including an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means located at peripherally spaced positions within the panel. The support means at each of the spaced positions includes a stud attached to the glass envelope, a spring and a plate. The spring has an aperture therein that engages the stud. The spring is attached to the plate, and the plate is welded to the mask assembly. The improvement comprises the plate being welded to the mask assembly at only one location. This location is on a line, perpendicular to the plate, that passes through the center of the aperture in the spring.

Abstract: A rectangular color picture tube of the shadow mask type includes an improved mask-frame assembly and support therefor. The frame has two substantially perpendicular flanges, a first flange and a second flange. The first flange extends from the second flange away from the screen of the tube. The second flange extends from the first flange toward the shadow mask. The second flange includes peripherally spaced tabs extending therefrom. The shadow mask is telescoped into the frame and is attached to the tabs. In a preferred embodiment, the corners of the frame are truncated. Springs are interconnected to each truncated corner of the frame to support the mask-frame assembly within the tube.

Abstract: The heating unit for sealing vacuum electron tubes of the type having a glass stem, a glass exhaust tubulation extending from the stem and a plurality of electrically-conducting leads extending from the stem in a circular array around the tabulation includes a cylindrical heating coil within a coil recess of an electrically-insulating coil support. The coil recess circumscribes a central aperture within the coil support. The coil support has a first and a second surface with a coil-positioning lip projecting upwardly from the second surface thereof and circumscribing the central aperture. A hollow, substantially cylindrical, tubulation-locator having an outwardly extending flange formed in an outside surface thereof is disposed between the second surface of the coil support and a base plate. The locator also includes a centering collar formed in its outside surface and a tubulation centering aperture formed in the inside surface. A top plate is adjacent to the first surface of the coil support.

Abstract: An electron gun assembly for use in a color CRT includes a pair of insulating support rods, three inline indirectly heated cathode disposed between the support rods, a heater for each of the cathodes and a pair of improved, reinforced heater tabs. The heater includes a pair of heater legs which are attached to the heater tabs. Heater bead straps are provided for attaching the heater tabs to the support rods. The electron gun also includes a plurality of electrodes for focusing and accelerating an electron beam generated by the cathodes. The reinforced heater tabs comprise a main body portion including a first and a second part. Each of the parts is attached to one of the heater legs. Each of the heater tabs has a pair of outwardly directed feet each of which is connected to one of the parts of the main body portion by a pair of substantially orthogonal legs extending therebetween.

Abstract: A method of surface-treating dry-powdered phosphor particles to control the triboelectric charge characteristics thereof includes the steps of providing the phosphor particles with a first coating of silica, dissolving a coupling agent selected from the group consisting of silanes and titanates in a suitable solvent to form a mixture, surface-coating the silica-coated phosphor particles with the mixture to provide a second coating of the coupling agent on the phosphor particles, filtering the surface-treated particles, rinsing the surface-treated particles with the solvent, and drying the surface-treated particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent overlying the silica coating controls the triboelectric charging characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.

Abstract: The method of electrophotographically manufacturing a screen assembly on a substrate for use within a CRT, according to the present invention, includes the steps of sequentially coating a substrate with a conductive layer and an overcoating of a photoconductive layer, establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then the photoconductive layer is developed with a charged screen structure material. The improved process utilizes a dry-powdered screen structure material having at least a surface charge control agent thereon to control the triboelectrical charging of the screen structure material.

Abstract: The present invention provides an improved grounding system for a kinescope having a conductive outer coating. The system includes a conductive metal tape having an adhesive on one surface thereof and exposed metal on the other surface thereof. The metal tape is adhered to the kinescope by its adhesive side. The metal tape extends from the conductive outer coating to means on the kinescope connecting to an electrical ground, and it is in electrical contact with the coating and interconnecting to the electrical ground through the means.

Abstract: The present invention provides an improvement in a color picture tube having an inline electron gun with coma correction members therein. The gun includes at least two electrodes that form a main focusing lens and a shield cup interconnected to one of the main focus electrodes. The improvement comprises the coma correction members being attached to the outside surface of the shield cup facing the main focusing lens electrodes. In a method of attaching the coma correction members to the shield cup, the members are provided as one of a plurality of sets of members in a continuous strip. One set of members are placed against the outside surface of the bottom of the cup and welded thereto. Portions of the strip that are not part of the welded members are broken-away from the welded members.

Abstract: In a vacuum electron tube, a novel oxide cathode comprising a metal substrate, means for heating said substrate to its operating temperature, and a layer of alkaline-earth-metal oxide on the substrate. The substrate is essentially free from silicon and contains operative concentrations greater than 1.0 weight % of chromium metal for progressively migrating into the oxide layer and reducing the oxide to yield alkaline-earth-metal.