Abstract: In a cathode-ray tube wherein the electrical connection between a conductive metal body attached to and having a surface contiguous with a surface of the envelope and a conductive layer on that surface is assured by a conductive stripe contacting the body and the layer, the stripe consists essentially of a minor proportion of glass and a major proportion of at least one metal selected from the group consisting of tin, lead and indium.
Abstract: Method comprises applying to a surface to be etched a coating of a liquid composition having a pH of about 5.8 to 7.0 and comprising an alkali caseinate, an alkali dichromate photosensitizer, sodium borate and water. The layer is dried, photoexposed, developed and baked to produce an etch-resistant stencil.
February 19, 1976
Date of Patent:
October 28, 1980
Joseph J. Piascinski, Ernest E. Doerschuk, III
Abstract: After an electron tube is exhausted and sealed, a base is pushed into position on the stem of the tube, the space between the stem and the base, at least around one pin of the tube, is filled with a sealing substance, and then the stem is heated until the sealing substance is at least partially cured by heat from the stem to form a dielectric material.
Abstract: A method for spot-knocking a CRT comprising interconnecting the lower-voltage gun elements including the heater, the cathode, the control electrode and the screen electrode, and applying spot-knocking voltages between the anode and the interconnected gun elements with the focus electrode floating electrically; that is, unconnected.
Abstract: In a method of making a virgin CRT (cathode-ray tube), soon after the panel and funnel are sealed together to form a bulb, the inside of the bulb is flushed with wet carbon-dioxide gas and then flushed with dry noncontaminating gas. Subsequently, the mount assembly is sealed into the funnel, and then the bulb is exhausted, sealed and gettered to produce the finished CRT.
Abstract: In a method for making an indirectly-heated cathode assembly, the steps of spacing the heater from the cathode substrate with a temporary volatilizable spacer, fixing the positions of the heater and cathode with respect to one another with the spacer therebetween, and then volatilizing the spacer.
Abstract: Method comprises (1) introducing a polarized light beam into the convex surface of an optically-transparent body whereby the beam propagates in the body in a guided manner near the surface, (2) extracting at least a portion of the beam from the body through the surface at a distance from where the beam was introduced, (3) sensing the change in polarization state of the extracted portion of the beam occurring during its propagation in the body, and (4) calculating the value of stress from the sensed change in polarization state.
Abstract: A fixture for supporting and aligning the faceplate and funnel of a CRT while they are being sealed together includes a plurality of alignment structures, at least one of which comprises rotatable rollers on a shaft oriented so that peripheral surface portions of the rollers provide prescribed surfaces for the faceplate and the funnel to bear against to align them.
Abstract: A cathode-ray tube comprises an evacuated envelope having therein a target and an electron-beam-producing means including a field-emission cathode therein. The beam-producing means comprises a plurality of spaced, pointed protuberances pointing in the same direction. Each protuberance has its own field-emission-producing means, a separate focusing-field-producing means for focusing the electrons emitted from the protuberance into a beam and means for modulating the individual beams in concert. The structure produces a plurality of modulated beams that are projected as a bundle in substantially parallel paths, which may be further operated upon as a single composite beam.
Abstract: In a method for making a cathode for an electron tube, after the cathode substrate and at least one apertured grid have been assembled into a mount assembly, an elongated support carrying cathode material is passed through the grid aperture, and cathode material is transferred to the substrate.
Abstract: In a method for preparing a luminescent screen which includes depositing a light-absorbing matrix upon a support, depositing a phosphor-particle layer on the matrix and support, and then coating the phosphor-particle layer with a film of organic polymeric material, the steps for salvaging the support and matrix substantially undisturbed, while substantially entirely removing the overlying material. In the method, the overlying material is contacted with an alkaline aqueous solution until the organic polymeric film is at least partially solubilized. Then, the overlying material is substantially entirely flushed away.
Abstract: In a method for sealing a glass stem into the neck of an electron tube, the stem, which is supported on a mount pin, is positioned in the neck, which is longer than desired. The neck is then heat sealed, as by fusion, to the stem, and the excess glass or cullet is cut off, whereby the cullet falls on, around and sticks to the mount pin. The novel method includes releasing the cullet from the mount pin without substantially fracturing the cullet. Then, the released cullet is removed from the vicinity of the mount pin, again without substantially fracturing the cullet.
Abstract: A CRT (cathode-ray tube) in combination with a notch-sealed band tensioned around the tube characterized in that the inner overlapping end portion of the band is folded at least twice upon itself and is positioned between the tube and the band. In the method, one end of the band is folded at least twice upon itself. The band is positioned around the tube with the end portions overlapping, the folded portion toward the tube and a sheathlike metal clip around the overlapping end portions of the band and against the inside of the end fold of the folded end of the band. Then, the clip is pushed against the end fold, and the outer end portion of the band is pulled until the desired maximum tensile force is applied, at which point the clip and overlapping end portions of the band are notched together.
Abstract: In combination, a CRT (cathode-ray tube) comprising an envelope including a glass faceplate panel and an adjoining glass funnel sealed to said panel, an elastomeric film coating consisting essentially of polyurethane around and adhered to said panel and a continuous metal reinforcing structure around said panel and adhered to said film coating.
Abstract: Method of making a CRT screen structure includes projecting a light field through an IC filter having a tailored light transmission, through a photographic master, and incident upon a photosensitive layer. The IC filter, which adjusts the light intensity across the field, comprises a cermet layer constituted of inorganic light-absorbing metal particles in an inorganic light-transmitting medium; for example, a nickel-silica cermet.
Abstract: The surfaces of a ferrous metal body are coated with a heat-fusible, chemically-oxidizing composition, such as sodium nitrate or potassium nitrate. Then, the coated body is heated above the melting temperature of the coating, preferably above 350.degree. C., until the coating melts, spreads over the surfaces, reacts with the material of the surfaces and produces a black oxide coating thereon.
Abstract: When precision etching a succession of articles from a strip of metal having random variations in thickness and moving along a prescribed path, the thickness of the metal strip is monitored, and the etching step is adjusted in response to the monitored thickness to compensate for the thickness variations.
Abstract: During low-voltage aging of a completely assembled cathode-ray tube, at least three voltage spikes at least three minutes apart are applied to the heater. Each spike has a voltage peak higher than the constant voltage applied to the heater during low voltage aging, and lasts for up to 120 seconds. This results in higher average emission levels and a reduced tendency of the emission levels to slump during emission testing of cathodes so processed.
Abstract: Cathode-ray tube has, for implosion protection, a first smooth-plastic-coated (preferably acrylic- or alkyd-coated) steel band laid directly on and encircling the glass panel, and a second smooth-plastic-coated steel band on the first band. Both bands are tensed to provide hoop compression in the glass panel of the tube. In some embodiments there may be a lubricating overcoating over the plastic coating and/or a short length of tape under the seal on the first band. Also, the forward edge of the first band may lie over the mold match line or up to 0.300 inch forward of the mold match line.
Abstract: An image display comprising a viewing screen including a layer of phosphor particles emissive of light of a particular visual color and color filter particles transmissive of light of that color .Iadd.partially .Iaddend.covering .[.between 20 and 80 percent of.]. the surfaces of the phosphor particles.