US2824988A - Grid structure for cathode-ray tubes - Google Patents

Grid structure for cathode-ray tubes Download PDF

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Publication number
US2824988A
US2824988A US511150A US51115055A US2824988A US 2824988 A US2824988 A US 2824988A US 511150 A US511150 A US 511150A US 51115055 A US51115055 A US 51115055A US 2824988 A US2824988 A US 2824988A
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United States
Prior art keywords
tube
color
grid
conductors
cathode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US511150A
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English (en)
Inventor
Donald R Cone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chromatic Television Laboratories Inc
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Chromatic Television Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL104063D priority Critical patent/NL104063C/xx
Priority to BE548076D priority patent/BE548076A/xx
Priority to NL207407D priority patent/NL207407A/xx
Application filed by Chromatic Television Laboratories Inc filed Critical Chromatic Television Laboratories Inc
Priority to US511150A priority patent/US2824988A/en
Priority to GB15944/56A priority patent/GB791646A/en
Priority to DEC13081A priority patent/DE1011461B/de
Priority to FR1149900D priority patent/FR1149900A/fr
Application granted granted Critical
Publication of US2824988A publication Critical patent/US2824988A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • H01J29/803—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching for post-acceleration or post-deflection, e.g. for colour switching
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C29/00—Joining metals with the aid of glass
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • H01J5/44—Annular seals disposed between the ends of the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0034—Lamp bases
    • H01J2893/0036—Lamp bases having wires, ribbons or tubes placed between two vessel walls and being perpendicular to at least one of said walls

Definitions

  • This invention relates to cathode-ray tubes especially adapted for color television image production. It is particularly related to an improved assembly and support for securing and supporting a color-control grid structure, or additional grid structures as well, within the tube envelope and in the tube wall.
  • the support mechanism provides also for ready alinement of the supported grid structure relative to the phosphor-coated target element, whether that elementl be a separately supported target plate, er whether it be a phosphor coating applied directly to the inner surface of the tube face panel.
  • color television tubes for producing images for direct viewing have been proposed in the art.
  • tube types which are proving to be particularly satisfactory is one utilizing a multiplicity of generally parallelly positioned substantially uniformly spaced linear conductors arranged in coplanar relationship to form a so-called color-control grid structure.
  • the color-control grid structure is adapted for positioning substantially adjacent to a nal target upon which the color television image appears at times of excitation of the target surface by one or more impinging cathode-ray beams appropriately modulated under the control of video signal information.
  • This type of structure utilizes as a color-control grid a plurality of linear conductors of which, for the socalled single gun type of tube (that is, a tube in which a single cathode-ray beam only is projected from an electron gun to impact the target), adjacent linear conductors are maintained electrically insulated from each other and alternate conductors are electrically connected.
  • the various linear conductors of the color-control grid may all be electrically connected.
  • the tube type here being considered has provided on the target surface upon which the cathode-ray beam finally impinges after it is directed through and between the linear conductors of the color-control grid a seriesl of phosphor strips of different light producing characteristics.
  • the phosphor strips are formed to produce light, preferably in the colors red, green and blue.
  • the phosphor strips are arranged according to a selected repeating pattern or color cycle.
  • the phosphor strips may be of such characteristics as to produce light in color sequence of red, green, blue, green, red, green, etc., when the signal modulated cathode-ray beam is directed thereupon.
  • the phosphor strips to produce the dierent colors of light are so arranged that phosphor strips to produce one selected color of light, say, green, are electron-optically centered with respect to adjacent linearV conductors. All phosphor strips f V 2,824,988 Patented Feb. 25, 1958- f. ICC
  • this character also extend substantially parallel to the linear conductors of the color control grid.
  • the phosphor strips to produce the light in the other two colors of the tricolor are, generally speaking, electron-optically centered beneath the linear conductors. Consequently, if the phosphor coating of the target is covered with a thin metallic film, such as an electrically conducting aluminum film, so that a high potential may be applied between this iilm and the electron source, and if the color-control grid is maintained at approximately the potential of the so-called G3 electrode (also frequently called the anode) of the electron gun, a strong electrostatic ield will be maintained between the color-control grid and the nal target and acceleration of the scanning cathode-ray beam will occur in the region between the color-control grid and the target.
  • G3 electrode also frequently called the anode
  • the eld also tends to refocus the electron beam directed from the electron gun to the color control grid, so that the beam is brought to a sharper spot at the plane of the phosphor-coated target.
  • the cathode-ray beam directed to the target through the color-control grid will be focused at a sharply defined spot on that target strip which is electron-optically centered in the space between adjacent linear conductors through which the cathode-ray beam is directed.
  • this invention is not broadly directed to the control of the color image reproduction but, rather, is concerned particularly with the support of the color-control grid structure formed vof the plurality of linear conductors, each substantially uniformly spaced from the other, and all arranged substantially parallel to each other, and in coplanar relationship.
  • the present invention provides for the support of the linear conductors of the color-control grid directly in the tube wall, and thus provides for a cathode-ray tube construction in which the weight is greatly reduced, the structure greatly simplified, the opportunity to provide extremely tightly strung linear conductors, and oifers the opportunity of obtaining increased image area.
  • Y At the same time there is no frame mass held or suspended tentials to adjacent linear conductors of the color controlV grid.
  • the shielding problem is also simplified and can besupplied externally of the tube.
  • thecathode-ray tube envelope of the type herein to ⁇ beA described comprises the usual flattened endi-wallthrough which the images are usually viewed, and thenzusually a funnel or conical-shaped portion merging into a .tubel neck, in which there is contained 4the sourcesto develop .the flow ofthe scanning cathode-ray beam or beams.
  • These components are known in the art as theelectron; gun and comprise the source to release theelectrorlsl an appropriate control-for modulating electrode and one or more accelerating or anode electrodes Whichnare vcc'illectivclyrknown as the electron gunv (not shown).
  • VAs the tubeY herein to be described Vis formed it comprises aV face panel-11Y inthe form of a glass or trans-Y parent vitreous member through'which the produced im- Yage may be viewed from the directionV indicated Yby the arrowV external tothe tube.
  • V L The face panel isformed.- generally attened, and of aperipherry configuration which may-bel circular yor whichgmay closely approach rectangular. form,V depending, ofcourse, upon the type ofY tube manufactured.
  • the inner surface of theface panel may, for some tubes, be coated with the .phosphor adapted to produce the image upon being excited and impacted by the scanning cathode-ray'beam, loi' the face panel may be left clear ⁇ and the image maybe produced upon a separate phosphor coated plate 15, as will later be described inrmore detail.
  • the face panelof the present construction is formed ingenerally dish-,shaped conliguration'with theflattened portion -17V providing the viewing area, and the -upturned portions 18 providing a more or less tubular sectionwhich-,isadapted to be secured to the funnel section ofthe tube envelope.
  • Theifunnel section 19 of the tube likewise is provided for connection to the end of the tube and to be secureddirectly to or through tothe inter-V mediate components -to the upturned portion 18 of the face platell.V v
  • Y provides anterior ⁇ ularly for supporting and mounting a multiplicity of linear conductors of the character above described ⁇ so as tojpr'ovide the supporting frame work directly in the tube wall.
  • a multiplicity of parallelly strungilinear conductors or grid wires V21 are causedy to span the interior of the tube envelope and to extendfor approximately the distance across the ring-like upturned edgesV 18 of therface plate.
  • Y usually formed ofiine wire of the order of about 3 mils, although ythis is not to be considered as a limiting statement, but rather illustrative, and-are spaced apart by-spac-V ings appropriate to-the size of the tubezand the image size to be developed.
  • the wire spacing may be of the order of 25 mils. All Vof the conductors 21 of the color-control grid are preferably held in ⁇ co-planar arrangement and extend as above stated,
  • the conductors are strung prior to tube assembly, so as to overlap a metallic ring-like memberZS, the surfaces -of which are ground at for Vready sealing and parallel to one or more suitable, plate mounting pins.
  • the wires extend parallel to the mounting pins in the preferred construction.
  • Theiconguration of the ring-like member is such that it ⁇ also corresponds substantially to the periphery of the tube, and'it isof a cross section such that the plate extends slightly within the inner boundary of the upturnedf Y edgesl of thedish-like face panel and also slightly beyond.- the outer periphery thereof.
  • Thejglass frits haveVV a high melting Vtemperature by which- Vis meant that they melt at a'temperature higher thanany temperatureexperienced.inthe tube evacuation and bakeout. Consequently, when the linear. conductors ofthe color-control grid are passed through the glass fritsV andthe fritsrare'fused ⁇ to 4become a glass seal,.there is Y a bond Vformed between the adjacently positioned metallic ring-like members 23 and 29 and a grid support sandwich isfformed. At this ora later time the Vlinear lconductors of thev grid which protrude beyond the-sandwich edgeshown atj 31 cani be connected together if. desired,
  • thereniay be secured al'ange 33 having a flattened surface of a form substantially matching that of themetallic ring-'like member ,29 ⁇ of' the' color-control Vgrid support sandwich.
  • Thetube may V'be provided as either. glass or metal bulbsh'for' instance, 'and where the bulb is glass mentfof the glass face panel. section to such aV metal ange.may"be ,accomplished inany desired fashion-as is As is well known, grid conductors of this sort are and a second r .metallic 'ring-like member 29 is rested upon the so assem- Well known in the art.
  • the face panel When the flange has been secured, the face panel may then be supported against the metallic ring-like member 29 with suitable glass frits of lower melting temperature therebetween. When the components are heated, the glass frits are caused to become plastic, after which the heat is removed and, upon cooling, the glass frits form a glass seal between the flange 33 and the metallic ring-like member 29.
  • the funnelshaped section 19 of the tube if formed of a metal, may have its outermost edge 35 also formed into a ilangelike element of a shape generally complementary to the ange 33. If the funnel-shaped section is of metal, it may be machined to provide the outer flange.
  • This flange is then matched and rested against the ring-like iiange 23 of the color-grid support sandwich and by means of a bond provided by the glass frits shown at 37v may be secured to the color-control grid sandwich.
  • the color-control grid sandwich when appropriately secured, as explained, to the upturned edges of the face panel and to the funnel section of the tube wall, forms a section of the tube Wall and is completely merged therewith.
  • the conical or funnel-shaped tube wall then may be provided with a conducting coating 39 (in the case of the glass tube) for the application of suitable potentials thereupon.
  • This coating is usually of a carbon type, such as that known as Aquadag
  • the panel wall also has a very slightly conducting coating 4t) applied thereto. This latter coating may be in the form of an iron oxide (FeO) or a chrome oxide on the inside of thev face panel.
  • a phosphor plate of the character illustratively shown at is provided within the tube.
  • a phosphor plate-supporting bracket in the form of a U-shaped element 43.
  • the U-shaped element is arranged to extend at generally uniformly spaced locations with respect to the interior wall of the tube as formed by the upturned portion 18 of the face panel, so that if, for instance, the tube is of a sort such that the upturned section 1S follows a circular path, the U-shaped section 43 will also follow a circular path and extend throughout an arc of a circle suflicient to hold the edges of the phosphor plate 15 or the vU-shaped section may be short length sections so that the phosphor plate edges may be held at spaced locations.
  • the tube is formed to provide a viewing area more closely rectangular in shape than the U-shaped brackets, it may conform more closely to one side of a rectangle.
  • the phosphor plate 15 is then positioned within the bracket prior to the assembly of the color-control grid with the upturned edges of the face panel.
  • the connection shown by -,the conductor 47 extending through the tube wall is to'provide high voltage which may be connected at the terminal point 48.
  • the plate 15 .so formed is coated with phosphor adapted to iiuoresce or become luminescent to electron beam excitation as above explained.
  • the phosphor is coated with aluminum or other suitable metallic lilm conventionally represented at 49, and high voltage is applied to the hlm. As is well known, the electron beam.
  • the dot-dash line passes adjacent to and between the conductors of the colorcontrol grid to impact the phosphor-coated plate 15 of the face panel, as likewise explained.
  • the adjacent wires are maintained electrically insulated from one another by the seal formed by the fusion of the glass frits. Alternate conductors of the color-control grid are electrically connected.
  • Appropriate potentials may be applied to these conductors and there may then be superimposed upon this steady potential an oscillatory potential to cause the scanning cathoderay beam to oscillate in its inotionalV path so that it is caused to impinge upon the phosphorsto produce light in the different colors in controlled manner.
  • Oscillations of the scanning cathode-ray beam for conditions where colored images are produced according to standards established at present in the United States by the Federal Communications Commission may use an oscillation of the order of 3.58 megacycles per second, which oscillation is then provided by the connection of the high frequency coil shown at 53 to which the oscillatory voltage from any appropriate source, not shown, is applied.
  • a shielding housing 55 is secured to the outer edge of the support sandwich for the color-control grid and surrounds the coil 53 electrically to shield the oscillations from having an external effect.
  • Grid structure of the sort last mentioned are known in the art as cylindrical grids and are particularly useful in tube types where a high degree of correction of the sort known in the art is desired and Where the angle of deection of the cathode-ray beam is very large. It will be apparent that the construction herein shown for providing the sandwich within which the linear conductors of the color-control grid are held may readily be of such peripheral shape and configuration as to provide for holding the cylindrical type color-control grid structure as well as the planar type color-control grid structure.
  • the socalled sandwich to support the grid wires is positioned slightly closer to the source of the electron beam or cathode-ray beam than is the target area upon which the images are to appear. Consequently, it will be borne in mind that the internal opening provided in the ringlike members 23 and 29 may be slightly less than the area of the image which is to be developed at the target, due, of course, to the angle at which the electron flow from the tube electron gun structure is directed toward the target. Alternatively, the area may be equal to the target area on which the image is to appear, or, if desired, it could be slightly larger. Accordingly, in the claims, reference to the relative dimensions of the central opening in the rings with respect to the target area when dened as approximately the same will be understood in accordance with this description.
  • A,YcatliodefrayY tube Yfor-color television comprising a gridjsupportframeconsisting of a pair of support rings each having a central-opening ofarea and configuration generally correspondingto Vthatof an image Yto be produced withinthetube Vforviewing, a multiplicity of tautly strungrprarallellyV positioned linear conductors overlapping .Opposite edges of theV support ringsrand located therebetween, a glass seal between the supportV rings imbedding Vthe overlapping linear conductors and servingvr for sealing VYthe support rings toieach other in sandwich fashion and forY anchoring the tautly strung conductors between the Ysupport rings in sandwich fashion, a face panel and a .Y vfunnel section, means to seal.
  • a lcathode-ray tube for. color television comprising a grid support'frame consisting of a pair of support rings eachk having a centralV opening of area and coniiguration generally corresponding to that of an image to be prolduced within the tubefforviewing, a multiplicity of Vtautly strung parallelly positioned coplanarly arranged linear conductors overlapping opposite edges of the support rings Vand located therebetween, a glass seal between'the support rings imbedding the overlapping linear conductors Vand'serving for sealing the support rings to each other in sandwich'fashion and for anchoring the Ytautly strung conductors between'the .support ringsfin sandwich fashion, a face panel and a funnel section, means to seal and secure the face panelv to one outer surface of thel sandwich supporting the linearconductors and means to seal the funnel section to the oppositerouter'surface of the sandwich supporting the linearconductors to provide a tube wall section which Vwill be vacuum-tight upon tube exhaust.
  • Acathode-ray tube for color television including a face panel, a funnel section adaptedfor securement tol the face panel about its peripheral edge, a color-grid supsealing means having a melting pointV higher than the-V ⁇ temperature produced during evacuation and bake-out of the, tube for securing the support rings andranchoring the linear conductors between the said supportringsin port frame comprising a pair Vof support rings, a multiplicity of [substantially uniformly spaced and tautly held substantially parallelly positioned linear conductors overlapping opposite edges of the support rings and frit means v having a melting point higher than any temperature producedduring evacuation and bake-out of the tube held between the support rings and adapted upon heatingrto aplastic 'state to' imbed the voverlapped linear conductorsV and to adhere to the rings and the conductors and subsequently ⁇ when cooled to a solidV state to secure and seal Y' the support rings to each other Vin vacuum-tight manner Vand to anchor the grid Wir
  • a cathode-ray tube for7 color television including a sandwich fashion and glass sealing means for'securing the Vface panel and the funnel section of the tube'components Y. to opposite outer surfaces of the linear conductor supportl and anchoring sandwich.
  • a cathode-ray tube for color television comprisnga Y face plate section of dish-like formation having a generally flattened window area and upturned edges sectionally I forming a ring-like pattern, a funnel V'shaped bulbous pory tion for'the tube also having a ring-like cross section of substantially like form and adaptedfor securement with the dish-like face panel, a grid conductor support sand'- wich comprising a pair of attened ring-like members of peripheral coniguration substantially corresponding'to'the ring-like formation of the funnel and face plate sections,

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US511150A 1955-05-26 1955-05-26 Grid structure for cathode-ray tubes Expired - Lifetime US2824988A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL104063D NL104063C (fr) 1955-05-26
BE548076D BE548076A (fr) 1955-05-26
NL207407D NL207407A (fr) 1955-05-26
US511150A US2824988A (en) 1955-05-26 1955-05-26 Grid structure for cathode-ray tubes
GB15944/56A GB791646A (en) 1955-05-26 1956-05-23 Improvements in or relating to methods of manufacturing cathode-ray tubes for reproducing colour television images
DEC13081A DE1011461B (de) 1955-05-26 1956-05-25 Verfahren zur Herstellung einer Elektronenstrahlroehre zur Wiedergabe von Farbfernsehbildern
FR1149900D FR1149900A (fr) 1955-05-26 1956-05-25 Procédé de fabrication d'un tube cathodique pour la reproduction de télévision en couleurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US511150A US2824988A (en) 1955-05-26 1955-05-26 Grid structure for cathode-ray tubes

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US2824988A true US2824988A (en) 1958-02-25

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US511150A Expired - Lifetime US2824988A (en) 1955-05-26 1955-05-26 Grid structure for cathode-ray tubes

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US (1) US2824988A (fr)
BE (1) BE548076A (fr)
DE (1) DE1011461B (fr)
FR (1) FR1149900A (fr)
GB (1) GB791646A (fr)
NL (2) NL104063C (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914691A (en) * 1956-01-18 1959-11-24 Gen Electric Compensation of cathode ray post acceleration field distortion
US2928968A (en) * 1959-02-27 1960-03-15 Paramount Pictures Corp Cathode-ray tube switching grid support system
US2936923A (en) * 1956-10-08 1960-05-17 Owens Illinois Glass Co Laminated joint for glass parts and method of sealing
US2945974A (en) * 1957-01-14 1960-07-19 Kaiser Ind Corp Electronic device
US3005921A (en) * 1958-01-27 1961-10-24 Rca Corp Cathode-ray tubes of the focus-mask variety
US3034009A (en) * 1960-01-18 1962-05-08 Gen Electric Pin seal accelerator tubes
US4602186A (en) * 1984-08-17 1986-07-22 Rca Corporation Insulating mount for a CRT Einzel lens focus mask

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661437A (en) * 1951-06-19 1953-12-01 Nat Union Radio Corp Dark trace cathode-ray tube
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube
US2722623A (en) * 1953-03-31 1955-11-01 Rca Corp Color-kinescopes etc.
US2736832A (en) * 1953-05-22 1956-02-28 Chromatic Television Lab Inc Hoop electrode structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661437A (en) * 1951-06-19 1953-12-01 Nat Union Radio Corp Dark trace cathode-ray tube
US2722623A (en) * 1953-03-31 1955-11-01 Rca Corp Color-kinescopes etc.
US2736832A (en) * 1953-05-22 1956-02-28 Chromatic Television Lab Inc Hoop electrode structure
US2690518A (en) * 1953-06-01 1954-09-28 Columbia Broadcasting Syst Inc Color picture tube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914691A (en) * 1956-01-18 1959-11-24 Gen Electric Compensation of cathode ray post acceleration field distortion
US2936923A (en) * 1956-10-08 1960-05-17 Owens Illinois Glass Co Laminated joint for glass parts and method of sealing
US2945974A (en) * 1957-01-14 1960-07-19 Kaiser Ind Corp Electronic device
US3005921A (en) * 1958-01-27 1961-10-24 Rca Corp Cathode-ray tubes of the focus-mask variety
US2928968A (en) * 1959-02-27 1960-03-15 Paramount Pictures Corp Cathode-ray tube switching grid support system
US3034009A (en) * 1960-01-18 1962-05-08 Gen Electric Pin seal accelerator tubes
US4602186A (en) * 1984-08-17 1986-07-22 Rca Corporation Insulating mount for a CRT Einzel lens focus mask

Also Published As

Publication number Publication date
NL207407A (fr)
DE1011461B (de) 1957-07-04
NL104063C (fr)
GB791646A (en) 1958-03-05
FR1149900A (fr) 1958-01-02
BE548076A (fr)

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