Abstract: A front assembly for a color cathode ray tube is disclosed that as having improved means for mounting components for electrical interconnection and magnetic shielding. The assembly comprises a faceplate having on its inner surface a centrally disposed, electrically conductive phosphor screen. A peripheral sealing area is located on the inner surface of the faceplate for receiving a funnel, and the funnel has an internal electrically conductive funnel coating adapted to receive a high electrical potential. A metallic shadow mask support structure is secured to the inner surface of the faceplate between the screen and the peripheral sealing area, and encloses the screen and is in contact with the screen. The structure supports in electrical union therewith a tensed foil shadow mask. The structure has a side adjacent to the sealing area essentially perpendicular to the screen which has secured thereto by weldments an internal magnetic shield.

Abstract: Electron tube having an evacuated envelope equipped with an electron emitting cathode, wherein a layer of activated silicon oxide is formed inside the envelope. The activated silicon oxide layer improves the emission life.

Abstract: Certain applications require a CRT display to be well shielded against emitting RF electromagnetic energy. A shield placed at the neck portion of a CRT envelope inhibits RF emissions from being transmitted through the face portion of the CRT. The shield comprises longitudinal conductors for suppressing transverse magnetic (TM.sub.01, TM.sub.02 . . . ) mode emissions and circular conductors for suppressing transverse electric (TE.sub.01, TE.sub.02 . . . ) mode emissions. Placing the shield at the rear of the CRT envelope eliminates the need for covering the face portion of the CRT with an optically transparent screen. To eliminate RF emissions from the CRT display the housing is provided with a contiguous RF emission shield that is connected to the shield on the neck of the CRT. Alternatively, an internal RF emission shield would enclose the video circuitry which includes all potential sources of undesired RF emission.

Abstract: A cathode-ray tube is coated on the inner surface with a coating material which contains, in a weight ratio based on solid, 10 to 22% of graphite, 30 to 50% of a metal oxide, 2 to 9% of a surface treating agent and 25 to 42% of water glass, and in which at least 18% of graphite powders in its simplest form suspended in said coating material have a particle size of at least 1 micron.

Abstract: Internal magnetic shield for color television picture tube has a pair of slot-shaped openings, facing each other above and below the Z axis, and an oblong-shaped aperture surrounding the Z axis, having a length-to-width ratio of about 1.7 to 2.1.

Abstract: A filter for a CRT screen according to the invention is constituted such that a compound sheet consisting of a conductive net and a transparent resin film is molded so as to be closely attached to the CRT screen, and also to avoid the occurrence of moire fringes, the mesh of the net is selected at a suitable value such that the ratio of the pitch of the scanning lines of the CRT and the pitch of the wires of the net does not fall near simple integers or the inverse numbers thereof. The filter can shut off the electromagnetic waves, electrostatic charge, ultraviolet rays, etc. which are generated from the CRT, without spoiling the resolution of the CRT and can substantially prevent adverse influences on the human body by the CRT. No moire fringes are produced on the screen. A hard coating treatment and a glare-proofing treatment are further performed, so that an illumination lamps or the like in the room are not reflected from the filter surface.

Abstract: In a cathode ray display tube having a glass faceplate carrying a screen thereon including a screen electrode and an electron multiplier disposed adjacent the screen for current-multiplying an electron beam directed onto the screen, a low profile termination arrangement for establishing electrical connection with the screen electrode and a multiplier electrode comprises respective, spaced, thick film conductive tracks on the inner surface of the faceplate and bordering the screen connected at lead-in portions thereof with conductor means, e.g. conductive epoxy, in apertures extending through the faceplate via metal sealing discs.

Abstract: The present invention relates to a cathode ray tube suitable for use with a flat type cathode ray tube in which a material from which a secondary electron is emitted by the impingement of an electron beam is exposed on a surface of an area of a first panel portion (2) having on its inner surface formed a phosphor screen on which the electron beam from an electron gun impinges and an insulative material which forms a second panel portion (3) is exposed on an inner surface of the second panel portion (3) opposing the first panel portion (2) wherein the secondary electron is accumulated to present a predetermined high potential state so that an electric field is prevented from being disturbed in a path of the electron beam.

Abstract: A front assembly is disclosed for use in a color cathode ray tube. The assembly according to the invention comprises a glass faceplate having a target area with a pattern of phosphor deposits covered with an electron-pervious electrically conductive metallic film. A shadow mask support assembly includes a glass frame sealed to and constituting an integral part of the tube envelope for supporting a shadow mask in precise spaced adjacency to the target area. The frame has an electrically conductive frame coating on at least a portion thereof. An electrically conductive foil shadow mask adapted to be charged with a high voltage is mounted in tension on the frame in electrical contact with a conductive frame coating. Conductive means which may comprise spring means is in contact with the mask or the conductive frame coating and the metallic film or a conductive extension thereof for conducting high voltage on the mask to the metallic film.

Abstract: A conductive connector arrangement for use in a CRT comprising a funnel having an internal Aquadag coating, a faceplate having a luminescent screen deposited upon its display surface, a ring formed of a non-conductive material having at least one recess thereon and interposed between the funnel and faceplate for supporting a mask in registration with the screen and an internal magnetic shield disposed within the funnel. The connector arrangement serves to establish the Aquadag, the screen, the mask and the shield at a common electrical potential. To this end the connector comprises a clip formed of a resilient conductive material and configured for retention in the ring recess. A first contact supported by the clip effects a conductive engagement between the screen and the clip. A second contact, also supported by the clip, effects a conductive engagement between the funnel coating and the clip. An electrical connection is effected between the clip and the mask.

Abstract: A cathode ray tube comprises an envelope, an electron beam source positioned at one end of the envelope, a target positioned at another end of the envelope, a mesh electrode positioned opposite to the target, and an electrostatic lens means positioned between the electron beam source and the mesh electrode. The lens means has a high-tension electrode and a low-tension electrode positioned along the electron beam path to focus the electron beam. The low-tension electrode is divided into four arrow or zig-zag patterns to deflect the electron beam. The length l between the electron beam source and the mesh electrode and the length x of the high-tension electrode are selected to optimize the magnification, aberration and landing error of the electrostatic lens means.

Abstract: An X-ray image intensifier apparatus consists of an X-ray image intensifier having an input window and an input screen opposing the input window, and a container for storing the X-ray image intensifier, and has a good contrast property. An X-ray shielding member comprising a resin in which a particulate material having X-ray shielding and absorbing effects is dispersed is provided on a peripheral portion of an input side of the X-ray image intensifier apparatus.

Abstract: A front assembly for a color cathode tube is disclosed. The tube faceplate has on its inner surface a centrally disposed screen area for receiving process materials during the spin-application process. The front assembly has a shadow mask support structure secured to the inner surface of the faceplate on opposed sides of the screen area. The structure has a first surface for receiving and securing a foil shadow mask, and a second surface inclined from the first surface to the screen area effective to conduct from the screen area any excess of coating material applied during the spin-application process. As a result, discontinuities in phosphor application visible to the viewer, and non-adherence of phosphor resulting in wash-off and flake-off, are avoided. An embodiment is also shown in which electrical connection is made between a mask support structure and a screen.

Abstract: In a display device provided with a main substrate having the lower surface on which a metallic layer is formed and the upper surface on which at least a power source or a deflection circuit is arranged, a plate member having one surface formed by an insulating material and the other surface formed by a metallic material is placed with its insulating material facing the lower surface of the main substrate.

Abstract: An internal magnetic shield disposed within a CRT has a machine-stamped integral bar member formed parallel to a flat surface thereof such that a narrow underpass is formed between the two ends of the bar member. A flat end of a contact spring having a resilient ramp-shaped tongue projecting therefrom is inserted through the underpass sufficiently to allow the end of the tongue to clear the bar member and spring back to contact the edge of the bar member, thereby preventing removal of the spring.

Abstract: Method comprises positioning a transparent safety panel in close spaced-apart relationship with the viewing window of a CRT and producing a mechanically-strong, hydraulically-tight closure between the panel and window around the margins thereof. The cell formed thereby is filled with curable liquid resin with the window and panel in an essentially vertical orientation. After bubbles have cleared and inspection completed, the liquid resin filling the cell is cured to an optically-clear solid.

Abstract: A cathode-ray tube comprising an evacuated envelope including a glass part and an electrically-conductive coating adhered to the glass part. The coating in the form of a patch or stripe consisting essentially of a major weight proportion of metallic silver particles, preferably in the form of flakes, and a minor weight proportion of lithium silicate binder. The electrically-conductive stripe or patch may be used to assure the electrical connection between an electrically-conductive metal body attached to and having a surface contiguous with a surface of the envelope and an electrically-conductive layer supported from that surface. The stripe or patch is applied from an aqueous slurry of silver particles and lithium silicate and is dried to a substantially water-insoluble, abrasion-resistant coating without or with high-temperature baking.

Abstract: Television camera tube comprising a tubular envelope of glass drawn on a mandril and having an internal conductive wall coating. A diaphragm having an aperture is supported in the envelope by a supporting surface extending transverse to the longitudinal axis of the envelope. The supporting surface is formed by a substantially stepwise change in the internal transverse dimension of the envelope. The conductive wall coating is interrupted at a distance from the diaphragm. The stepwise change in the internal transverse dimension of the envelope portion taking place in at least a first a step and second step. The first step forms the supporting surface for the diaphragm. The interruption (6) in the conductive wall coating is provided on the second step. If the diaphragm in such a tube is a flat plate and the distance d between the first step and the second step is between 0.4 D and D, where D is the inside diameter of the envelope between the first and the second step, the axial astigmatism.

Abstract: A color cathode ray tube having feedback features including a phosphor pattern on the mask and a window in the tube wall to allow external detection of the phosphor emissions, also incorporates arc limiting features including a high resistance coating in the neck region of the tube and a lower resistance coating underneath the arc limiting coating in the region of electrical contact between the arc limiting coating and the electron gun. The composite coating is effective to reduce erosion of the arc limiting coating in the area of snubber contact during high voltage conditioning of the tube. Such a tube is useful, for example, for high resolution color displays having an automatic convergence feature.

Abstract: A color cathode ray tube having a phosphor pattern on the mask and a window in the tube wall to allow external detection of the phosphor emissions, also incorporates arc limiting features including a high resistance coating in the neck region of the tube and a getter designed and placed to direct getter flash away from the neck, window and mask areas. Such a tube is useful, for example, for high resolution color displays having an automatic convergence feature.

Abstract: The invention provides efficient means for dissipating deleterious charge build-up in the glass neck portion of a color cathode ray tube employing an in-line plural beam electron gun assembly. In one embodiment, the invention is comprised of two longitudinal stripes of electrical conductive material oppositely applied on the neck substantially over both narrow sides of the gun assembly. Connective conductors join the stripes to the grounded funnel coating to provide for dissipation of the charge. In another embodiment, the longitudinal stripes are joined by two band-like layers encompassing inter-electrode spacings of the gun assembly.

Abstract: A cathode-ray tube comprising a glass viewing window having, on its external viewing surface, an antistatic, glare-reducing, image-transmitting coating. The coating has a rough surface and is composed essentially of a silicate material and a metallic compound in proportions to impart the desired antistatic characteristic without substantially degrading the image-transmitting capability of the coating. When the tube is operated, the coating is grounded either directly or through the metal implosion-prevention system on the tube.

Abstract: A cathode ray tube device which comprises an electromagnetic shielding casing, a cathode ray tube held in said casing, an elastic material provided between the casing and cathode ray tube in contact therewith, and a space or porous material formed in part of a region defined between the casing and elastic material, and wherein said space or porous material suppresses the axial shifting of the cathode ray tube resulting from the thermal expansion of the elastic material when it is highly heated.

Abstract: An electrically conductive layer on a wall portion of the envelope of an electric discharge tube which comprises an electrically conductive material and at least 5% by weight of silicon dioxide as an adhesive, adheres readily, is hard and can be washed with water.Such a layer can be obtained from a suspension comprising an electrically conductive material and a binder in a solvent, in which the binder is a quaternary ammonium silicate or a solution of silicon dioxide (SiO.sub.2) in phosphoric acid (H.sub.3 PO.sub.4), in which the mol ratio SiO.sub.2 /P.sub.2 O.sub.5 is between 0.3:1 and 20:1.

Abstract: Cathode ray tubes with optical windows in the sidewall or funnel portion thereof are provided with transparent conductive films of metal oxide on the inner surface of the funnel in the window area. Such films provide electrical continuity with the internal conductive coating of the tube, while permitting optical viewing. The films are produced by in-situ pyrolysis of films of metal resiantes in organic solvents.

Abstract: CRT (cathode-ray tube) comprises an evacuated glass envelope, an electron-gun mount assembly housed in the envelope, the electrodes of said envelope being confined by closely-spaced glass surfaces, and a smooth, electrically-conductive coating of tin oxide on said glass surfaces opposite electrodes of said mount assembly. The electrically-conductive coating is electrically floating and, preferably, is a substantially-continuous circumferential band on the inner surface of the neck of the CRT.

Abstract: A screening structure for a cathode ray tube display includes at least a cathode ray tube pin socket, a cathode ray tube input pin and a video amplifier section joined as one body and enveloped with a first screening member which has high conducting characteristics, and a cathode ray tube cathode section enveloped with a second screening member which has high conducting characteristics, the first and second screening members being connected as one body in order that they may be maintained at the same high frequency potential. The screening members are joined to the standard potential part of the cathode ray tube display by a cable having a low high-frequency impedance.

Abstract: The invention relates to internal magnetic shielding means for a cathode ray tube using a spun-funnel envelope portion. The sidewall of the shielding structure is of discretely shaped contour to provide a desired spatial compatibility with at least portions of a projecting glass ridge on the interior surface of the funnel.

Abstract: A cathode-ray tube has in a neck section of a hermetically sealed, evacuated envelope an electron-gun mount assembly in which of a cathode for emitting an electron beam, a first grid electrode section for forming a crossover point and for accelerating the electron beam and a second grid electrode section for focusing the electron beam are mounted on a plurality of insulative supporting bars. A conductive member is provided on an outer surface portion of the neck section, an inner surface portion thereof, and/or an outer surface portion of the supporting bars which surround a portion of the electron-gun mount assembly including the first grid electrode section but excepting the second grid electrode section.

Abstract: A cathode ray tube has discrete x-ray absorbing means integrally associated with the face region thereof to beneficially attenuate the x-radiation emanating peripherally and forwardly therefrom. Attached to the tube face is a closed frame-like resilient gasket impregnated with x-ray absorbing material. Superposed thereon is a cover plate of x-ray absorbing glass. This is adhered to the tube face by a layer of substantially transparent adhesive confined within the gasket.

Abstract: CRT (cathode-ray tube) comprises an evacuated glass envelope, an electron-gun mount assembly housed in the envelope, the electrodes of said envelope being confined by closely-spaced glass surfaces, and an insulative coating on said glass surfaces opposite electrodes of said mount assembly. The insulative coating is a substantially-continuous, noncrystalline film of a nonionic organic polymeric material.

Abstract: A support frame (10) of a cathode-ray tube for color television including a mask fixing section (10a) for affixing a shadow mask (2), an inner electron shield section (10b) extending from an end portion of the mask fixing section on the panel fluorescent surface side, and an outer electron shield section (10e) located on the panel skirt side as seen from an end portion of the mask fixing section on the panel seal surface side, the three sections (10a, 10b, 10e) being formed integrally with one another. The outer electron shield section includes a fold-back portion (10c) turned back from the panel seal surface side of the mask fixing section toward the panel fluorescent surface side, and a side wall portion (10d) extending from the fold-back portion along an inner surface of a panel skirt (1c).

Abstract: An electrical conductor device is connected between an anode voltage supply terminal on the funnel and an electron gun assembly in the neck in parallel with a conductive inner graphite film for electrical connection of the terminal and the assembly. The conductive inner graphite film has a high-resistance portion and a low-resistance portion, and the electrical conductor device has a smaller resistance than that of the high-resistance portion. Upon spot knocking, high voltage is selectively supplied to the electron gun assembly through the electrical conductor device and in operation, through the conductive inner graphite film.

Abstract: A glass funnel for a cathode ray tube is formed by centrifically casting it in a rotating mold. Integrally formed lugs are formed on the interior wall of the funnel. The lugs vary in geometry and are utilized to position and attach a magnetic shield to the funnel. The funnel and its attached magnetic shield forms a subassembly that is independent of the remainder of the cathode ray tube components.A method is set forth for fabricating the funnel and the attached lugs by centrifugally spinning molten glass within a mold.

Abstract: The magnitude of a DC high voltage supplied to an internal element of a CRT is varied by a thermionic valve that is located within the envelope of the CRT and that forms a voltage divider with an external load resistor. Only a small scale signal referenced near ground is needed to produce a several thousand volt change in the high voltage supplied to the internal CRT element. The variable high voltage may control a variable deflection factor, variable spot size, or in the case of a beam penetration CRT, either variable persistence or variable trace color. In a particular beam penetration color CRT having a split anode the thermionic valve comprises a tetrode flood gun coupled by an electron mirror to a plate region in the neck of the CRT.

Abstract: The invention relates to improved combination means for achieving positive placement of an internal electrical contactor in a cathode ray tube to effect and maintain a definitively oriented connection between an internal magnetic shield and a conductive coating disposed on the interior surface of the funnel portion of the tube envelope. Discrete portions of the shield are modified to form a pair of contactor positioning nubs and a cooperating indentation to contain a portion of the contactor in desired alignment therewith.

Abstract: There is disclosed a color picture tube of the type having inner and outer conductive films respectively formed on inner and outer surfaces of a glass bulb of the color picture tube and a conduction path formed in the inner conductive film which extends from an anode terminal provided for the outer surface of the glass bulb to an electron gun for applying thereto anode high voltage. In this type of color picture tube, the resistance of the conduction path extending from the anode terminal to the electron gun is made smaller than an average resistance of a portion of the inner conductive film excepting the conduction path. With this arrangement, sufficient arcing energy can be obtained for removing causes for arcing when spot knocking involved in the manufacture process for the color picture tube is carried out and in addition, flash-over current accruing from arcing taking place during actual operation of a color television receiver set incorporating the color picture tube can be suppressed.

Abstract: A radiation shield 14 for a cathode ray tube 10 neck 16 includes a sleeve 24 of insulating material. Bonded to the inner surface 26 of the sleeve 24 are a plurality of elongated, coaxially oriented spaced conductive elements 30. Similarly, a plurality of elongated, coaxially oriented spaced conductive elements 32 are bonded to the outer surface 28 of the sleeve 24. The inner elements 30 are offset from the outer elements 32. A conductive ring 40 is connected to each of the inner 30 and outer 32 elements along one end of the sleeve 24 and to ground potential by a drain strap 44.

Abstract: An inner shield made of a magnetic material for shielding the earth magnetism is provided in a color picture tube for preventing the mislanding of the electron beams on phosphor stripes that might otherwise result from the bending of the electron beams caused by the earth magnetism. The inner shield is formed by securing a pair of short side sections and a pair of long side sections to a mask frame such as to define a substantially rectangular space through which the electron beams pass. Gaps offering increased magnetic reluctance are provided between the short side sections on one hand and the long side sections on the other hand, whereby the components of the horizontal earth magnetic field vector are adjusted to cancel electromagnetic forces acting upon the electron beams.

Abstract: Interference radiation produced by a color television tube during operation is reduced by incorporating a resistor of approximately 5 kOhm to 100 kOhm between a shadow mask and a conductive layer on the tube's display screen. This resistor reduces by 4-6 dB electromagnetic energy radiated by the tube in the frequency band of approximately 150 kHz to 1.5 MHz.

Abstract: A method of producing a graphite-based conductive coating composition to be applied to the interior wall of a color picture (cathode-ray) tube, which method comprises the steps of preparing a mixed solution of electroconductive materials by mixing graphite particles, a metal oxide and a surface treating agent with water, producing an electroconductive powder by instantaneously drying said mixed solution, and mixing said electroconductive powder with a silicate and a dispersant in water and stirring the mixture. Said metal oxide, which is a component of said mixed solution, is preferably titanium oxide and the like and said surface treating agent is preferably silicon oxide. It is also desirable that said mixed solution of electroconductive materials be dried instantaneously by spray drying.

Abstract: A conductive spacer having one end secured to an electron gun structure housed in the neck tube of a color picture tube makes contact, at the other end, to a conductive film coated on the inner wall surface of the envelope of the color picture tube. A portion of the conductive film making contact with the conductive spacer comprises a conductive frit glass film.

Abstract: A cathode ray tube comprises an envelope having a funnel portion with an electrical terminal extending through a wall surface thereof. A faceplate is sealed to the funnel portion and a screen contact assembly provides electrical contact between the electrical terminal and an aluminum coating on an inside surface of the faceplate. The screen contact assembly includes a conductive strip attached at one end to the electrical terminal. At the other end of the strip and attached thereto is a relatively flexible first contact member which is in pressured electrical contact with the aluminum layer on the faceplate. Disposed between the flexible first contact member and the aluminum layer on the faceplate is an oxidized, silver plated NICHROME foil member of high electrical conductivity. Transverse support and lateral stability is provided by a relatively flexible second contact member attached to and forming a part of the screen contact assembly.

Abstract: A glass composition is disclosed that is useful as a solder glass for sealing components together. However, the glass is also especially adapted for use as an electric resistance film for coating the inner neck or funnel portions of a cathode ray tube to reduce arcing. The glass composition includes primarily the oxides of vanadium and phosphorous with the preferred addition of either zinc oxide or lead oxide. Still other metal oxides may be optionally included such as oxides of barium, antimony, lithium, manganese, silicon, boron, molybdenum and mixtures thereof.

Abstract: An image pick-up tube assembly, including an image pick-up tube having a target provided in the front portion thereof, a coil assembly surrounding the image pick-up tube, a cylindrical shield case housing the image pick-up tube and the coil assembly, and front and rear shield caps covering the front and rear openings of the shield case. The front shield cap is mounted to the shield case such that both horizontal and vertical contact planes are formed therebetween to significantly reduce the influence of the earth's magnetism on the assembly so that a three tube type television camera employing three such assemblies is effected much less by direction dependent color deviation.

Abstract: The invention provides a television camera tube having between the gun thereof and its target a baffle member formed as a wall integral with the tube and extending inwardly and towards the gun to provide a particle receiving cavity extending around the path of the beam of the gun for retaining loose particles originating from the gun and which would otherwise land upon the target of the tube when this is operated in a "face-down" position.

Abstract: A CRT comprising an evacuated envelope having an electrically-insulating neck and a beaded electron-gun mount assembly in the neck. The beads of the assembly are closely spaced from the inner surface of the neck. At least a portion of the surfaces of the beads opposite the neck is electrically conducting.

Abstract: In a cathode-ray tube, in particular a camera tube, the inner wall of the glass envelope is coated with an electrically conductive material interrupted in the proximity of electrodes extending transversely to the wall coating and supported by transversely extending supporting surfaces. At the area of each of the interruptions the envelope has a stepwise decrease of the inside diameter in two steps. In the direction of decreasing diameter the first of these steps constitutes the supporting surface for the transverse electrode and the interruption in the wall coating is provided on a wall portion of the second of these steps. The interruptions provided in this manner do not exert any disturbing influence on the electron beam in the tube.

Abstract: A cathode ray tube includes an evacuated envelope having an inner surface supporting an arc limiting coating which includes insulator oxide particles, graphite particles and a silicate binder and is characterized by the improvement of insulator oxide particles having an exothermic heat of formation greater than the exothermic heat of formation of iron oxide.

Abstract: A cathode ray tube including an arc limiting resistor means (42) formed on an extension of the glass rods which align and fix the electrodes of the guns (28). The resistors also include means (54) for centering the guns in the neck of the tube.