Abstract: An improved color picture tube includes an evacuated envelope having a rectangular faceplate panel. The panel includes a viewing screen on an inner surface thereof and a shadow maskframe assembly mounted therein by support means located at the four corners of the panel. The shadow mask-frame assembly includes an apertured shadow mask and a peripheral frame to which the mask is attached. The frame has two flanges arranged in an L-shaped cross-section. The support means are attached to the corners of the frame. The improvement comprises the frame being formed by four sections that are welded together at their ends. Each section includes a side of the frame and two angled corners of the frame at each end of each section. The sections overlap each other at their ends, with both of the flanges of each section in surface-to-surface contact with each other.

Abstract: A color picture tube includes an inline electron gun for generating and directing three inline electron beams along coplanar beam paths toward a screen. The gun includes a plurality of electrodes which form a beam-forming region, a prefocusing lens, and a main focusing lens for the electron beams. The prefocusing lens includes four active surfaces. At least one of the active surfaces has asymmetric prefocusing recesses formed therein.

Abstract: A method of forming an implosion protection band for a substantially rectangular CRT is disclosed. The band has at least one mounting lug comprising a base portion and an attachment portion cooperating therewith. The method includes the steps of expanding the dimensions of the band to form at least one outwardly directed concavity therein to accommodate the base portion of the mounting lug to prevent the lateral displacement thereof, attaching the mounting lug to the band and affixing the band to the CRT to compressively force the band and the base portion of the lug against the CRT.

Abstract: The improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means that are located at peripherally spaced positions within the panel. The support means provide compensation for thermal expansion of the shadow mask assembly. The compensation is a movement of the shadow mask assembly toward a screen of the tube as the shadow mask assembly expands. The support means at each of the spaced positions includes a stud attached to the glass envelope, a spring having an aperture therein engaging the stud, and a plate welded between the spring and the shadow mask assembly.

Abstract: An implosion-resistant cathode-ray tube has an evacuated envelope with a faceplate which includes a substantially rectangularly-shaped viewing portion that extends to a peripheral sidewall. The sidewall has corners with a given radius of curvature which extends into flattened portions. An implosion protection band extends around the sidewall. A plurality of mounting lugs each having a base portion and an upstanding attachment portion cooperate with the implosion protection band. The base portion of each of the mounting lugs is disposed between the band and the sidewall. The present implosion protection band is improved over prior bands by forming a plurality of concavities in the band to accommodate the base portions of the mounting lugs. The concavities prevent lateral displacement of the mounting lugs and also maximize the contact between the implosion protection means and the sidewall of the faceplate panel.

Abstract: An implosion-resistant cathode-ray tube has an evacuated envelope with a faceplate which includes a substantially rectangularly-shaped viewing portion that extends to a peripheral sidewall. The sidewall has corners with a given radius of curvature which extends into flattened portions. An implosion protection band extends around the sidewall. At least one mounting lug having a base portion and an upstanding attachment portion cooperates with the implosion protection band. The base portion of each of the mounting lugs includes a shoulder projection which substantially conforms to the given radius of curvature of the corners of the sidewall. The attachment portion of the mounting lug is located along a section of the flattened portion of the sidewall of the faceplate panel.

Abstract: A device for the internal graphitization of the surface of the neck in the cone of cathode ray tubes.A device of this type comprises a frame bearing two arms, such as, capable of rotating around an axis, such as, each bearing a collar, for example, each adapted to a given type of cone. This collar has two functions: that of providing for centering along an axis (xx) of the neck of the cone and that of defining a reference line (L.sub.r).With these arms there cooperate, firstly, a supporting table on which the cone is laid and centered in a horizontal plane and, secondly, a graphitization system such that the brush in its top position reaches a determine upper limit (Lg) and, finally, a combination of means providing for the upward translational motion of the supporting table and of the graphitization system, the regulated descent of the latter, the supporting table remaining still during this stage of descent of the brush.

Abstract: The present invention provides an improved method of assemblying a rectangular tensioned shadow mask wherein the two long sides are welded to two curved frame members paralleling the major axis. The improvement comprises forming two subassemblies of said frame, each subassembly including one of the curved members and two partial straight members, each partial straight member being attached at 90 degrees to an end of the curved member. Next, the two subassemblies are positioned in approximately their final positions with the partial straight members on each side of the frame overlapping each other but forming an angle less than 180 degrees on the side of the frame of the intended mask attachment. The long sides of the mask are next welded to the curved members. Now, the subassemblies are rotated until the partial straight members are aligned, to apply tension to the two curved members to place at least a central portion of the shadow mask under a predetermined tension.

Abstract: A method for uniformly beveling an inside edge of a glass article having an opening at one end thereof includes the steps of: providing a plate having a peripheral shape generally corresponding to that defined by the edge of the glass article, the plate having a beveled edge containing an abrasive material; supporting the glass article so that its inside edge is in proximity to the beveled edge of the plate; and establishing contact between the glass article and the abrasive material. An orbital, undulatory motion is induced between the bevel plate and the glass article to abrade at least a portion of the inside edge of the glass article. An apparatus for practicing the method is also described and may be used for uniformly beveling the inside edge of CRT funnels and faceplate panels.

Abstract: A method of salvaging a color selection electrode for a CRT having a coating of a compound of a heavy metal and an alkali silicate on a surface of the electrode includes the steps of immersing the electrode in a stripping solution consisting essentially of ammonium bifluoride, a suitable detergent, and water; agitating the solution to remove the coating from the electrode; rinsing, and then drying the electrode.

Abstract: The present invention provides an improvement in a color picture tube having a tensioned shadow mask and support frame assembly. The mask is rectangular, having two long sides paralleling a central major axis thereof and two short sides paralleling a central minor axis thereof. The mask has a cylindrical contour, with the mask being curved along the major axis and straight along the minor axis. The improvement comprises the frame including two curved members paralleling the major axis and each other and two straight members paralleling the minor axis and each other. The curvature of the curved members matches the curvature of the cylindrical contour of the mask. The two long sides of the mask are welded between the two curved members. Each of the straight members includes two overlapped parts that are welded together where overlapped. Each of the parts is attached to the end of one of the curved members.

Abstract: An improved color picture tube includes a mask that has an aperture array including slit-shaped apertures aligned in columns that essentially parallel the minor axis and end at a border of the aperture array. Adjacent apertures in each column are separated by tie bars in the mask. The tie bars in one column are offset in the longitudinal direction, paralleling the minor axis, from the tie bars in each adjacent column. The spacing between tie bars in a column is the tie bar pitch at a location on the mask. A first set of columns, that includes every other column, has increased tie bar pitch at the ultimate end apertures, as compared to the tie bar pitch at the penultimate apertures in each of the columns. In a second set of columns, every other column not in the first set, has decreased tie bar pitch at the ultimate end apertures, as compared to the tie bar pitch at the penultimate apertures in each of the columns.

Abstract: In accordance with the present invention, a method of manufacturing a luminescent screen assembly on a substrate of a CRT includes the steps of providing a coating of a non-luminescent screen structure material in a predetermined pattern on the substrate and depositing a plurality of color-emitting screen structure materials on the substrate. The color-emitting screen structure materials are surrounded by the non-luminescent material. An electrostatically-charged dry-powdered resin is deposited onto the aforementioned color-emitting and non-luminescent screen structure materials and fused to form a substantially continuous film.

Abstract: A color cathode-ray tube-yoke combination comprises a color cathode-ray tube having a glass envelope and a yoke for producing magnetic fields positioned thereon. At least one semi-flexible corrective magnet is attached to a curved portion of the envelope. The novel corrective magnet is improved over prior corrective magnets by the inclusion therein of at least one portion of reduced thickness which increases the flexibility of the corrective magnet to provide conformity to the curved surface portion of the envelope.

Abstract: The disclosure concerns the manufacture of mask type color television tubes. A diaphragm is used, for which the profile or aperture is modified during the operation for the uniform illumination of the vertical stripes of the screen during the different stages for the deposition of luminophors. The modification of the profile is obtained by the shifting of strips parallel to the vertical stripes.

Abstract: An improved color picture tube includes a rectangular faceplate panel having two long sides and two short sides. A rectangular shadow mask is suspended at its four corners by support means within the panel adjacent to a cathodoluminescent screen located on the panel. The tube has three principal axes that are mutually orthogonal to each other. These axes include a longitudinal axis which extends through the center of the tube perpendicularly to the center of the panel, a major axis which passes through the center of the panel paralleling the long sides of the panel, and a minor axis which passes through the center of the panel paralleling the short sides of the panel. Each of the support means has a central support axis. The improvement comprises the two support axes on each side of the minor axis crossing a plane containing the longitudinal and major axes at a point located between the minor axis and a short side of the panel.

Abstract: A cathode-ray tube-yoke combination comprises a cathode-ray tube having a glass envelope and a yoke fixedly positioned on the envelope with a body of cured polymeric material. The novel composition of the polymeric material comprises a UV-curable adhesive and UV-transmissive particles of a suitable material in an amount sufficient to accelerate the curing of the adhesive. A method to accelerate the curing is also described.

Abstract: The method of surface-treating dry-powdered phosphor particles for use in manufacturing a viewing screen for a CRT to control the triboelectric charge characteristics of the phosphor particles includes the steps of dissolving a suitable quantity of a polymeric coupling agent in a suitable solvent to form a mixture, surface-treating the phosphor particles by adding them to the mixture to provide a coating of the coupling agent thereon, and then drying the surface-treated phosphor particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent controls the triboelectric charge characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.

Abstract: An improved color picture tube includes 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, and a spring, having an aperture therein that engages the stud. The spring is interconnected with the shadow mask assembly. The improvement comprises the spring including a first portion interconnected with the shadow mask assembly, an elongated second portion extending from the first portion toward the stud, a third portion interconnected with the second portion and including an aperture engaging the stud, and an offset section that positions the center of the aperture on a central longitudinal plane passing through the second portion.

Abstract: A color picture tube includes a screen and an improved inline gun for generating and directing three inline electron beams along separate paths toward the screen. The gun includes a plurality of cathodes and at least six electrodes longitudinally spaced from the cathodes. The improvement comprises the first, second and fourth electrodes from the cathodes being of materials having lower coefficients of thermal expansion than the coefficients of thermal expansion of the materials of the other electrodes.