US2791710A - Grid structure for television tube - Google Patents

Grid structure for television tube Download PDF

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Publication number
US2791710A
US2791710A US343834A US34383453A US2791710A US 2791710 A US2791710 A US 2791710A US 343834 A US343834 A US 343834A US 34383453 A US34383453 A US 34383453A US 2791710 A US2791710 A US 2791710A
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United States
Prior art keywords
target
grid
tube
conductors
rods
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Expired - Lifetime
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US343834A
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English (en)
Inventor
Dressler Robert
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Chromatic Television Laboratories Inc
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Chromatic Television Laboratories Inc
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Filing date
Publication date
Priority to NLAANVRAGE7808455,A priority Critical patent/NL185725B/xx
Priority to BE526096D priority patent/BE526096A/xx
Application filed by Chromatic Television Laboratories Inc filed Critical Chromatic Television Laboratories Inc
Priority to US343834A priority patent/US2791710A/en
Priority to GB34863/53A priority patent/GB757810A/en
Priority to FR1091379D priority patent/FR1091379A/fr
Priority to DEC9072A priority patent/DE1011918B/de
Application granted granted Critical
Publication of US2791710A publication Critical patent/US2791710A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • 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

Definitions

  • This invention relates to cathode ray tubes of a type usable to produce and display images in either substantially natural color or monochrome.
  • the images which are to be created for display upon the tube tar-get are developed as the result of one or more electron beams impacting a phosphor coated target ⁇ area thereon to develop electro-optical effects which become observable as light images.
  • the impacting electron flow toward the target area from any suitable source is adapted to be signal controlled by any desired form of modulation mechanism and bidimensionally deflected relative to the impacted target area so that a raster is traced according to Well known patterns.
  • the present invention despite such utility of the grid structure, is concerned, however, with the formation of Y the grid itself and with the positioning of such a grid relative to the tube target.
  • the grid conductors are arranged to extend parallel to one edge of the phosphor strips and for a length usually, from practical standpoint, slightly in excess of the phosphor strip length, the excess length being used to provide for supporting the grid conductors and for connecting them to operating electrical circuitry through suitable connections made to the tube.
  • the present invention is particularly concerned with providing a mechanism for supporting and anchoring the conductors 'forming the grid in such a way that precise parallelism Vwill be maintained between adjacent grid conductors and, at the same time, the conductors when drawn taut relative to the supporting components may readily be alined in coplanar fashion and spaced-at any desired optimum operating distance from the target.
  • the grid is placed and supported in fixed fashion substantially adjacent to the target area which is coated with the already discussed phosphor strips.
  • the grid element is located relative to the phosphor coated target at such a -distance therefrom that the effect of its field in the plane of the target is substantially uniform.
  • it is spaced apart from the plane of the target surface by -a distance which is only an extremely small fraction .of the 'length of the electron path from the source to the final target plane and it is closer Ito the target th-an any other active elements of the tube.
  • reference to positioning mechanisms for supporting the grid relative to the target will be defined in this sense as positioning the grid adjacent to the target.
  • the phosphor coating is applied to a ,transparent vitreous window surface ⁇ within'the tube so that when -the developed electron flow within the tube impacts the target Iand the energy of lthe electrons is converted into electro-optical effects those effects are visible through the target surface.
  • a target of this character is positioned internally of the tube end wall for convenience of manufacturing and the developed electro-optical effects created -upon the target surface :are then viewed through a transparent window constituting the end wall of the tube, as ⁇ contrasted with both the target surface andthe tube end wall being identical.
  • the target surface is a planar vitreous element supported within the tube envelope just slightly within the contines of a transparent tube end wall.
  • suitable grid conductors or wires for a structure which will serve as an accelerating, focusing and color control grid of the general type already mentioned are strung or tightly stretched over suitable support rods located generally to border two opposite edges of what will be formed as the raster area in the tube in its operation.
  • suitable support rods located generally to border two opposite edges of what will be formed as the raster area in the tube in its operation.
  • the separate phosphor strips having such characteristics as to lluoresce in diterent colors upon excitation may be arranged on the target surface according to a repeating color cycle.
  • Such a color cyle may follow a pattern to produce light in the colors red, green, blue, green, red, green, blue, green, and so on.
  • a pattern of this character is generally one Where the width of the phosphor coated strip area to produce each of the red and blue light is one-third of the width of one elemental area into which it is assumed the image division takes place.
  • the suggested color cycle provides twice as many phosphor coated strip areas to produce green light as those used to produce the red and blue light, it is usually desirable for the obtainment of a proper balance of color to form the green-light-producing strips to approximately one-half the width of those used to produce red or blue light.
  • the explanation is purely illustrative and per se forms no part of the present invention except insofar as it aids in the general understanding and relates the type of grid support and structure herein to be set forth to a tube of the character mentioned so that the strips to produce green light may for some tubes equal the width of the other strips.
  • the grid con-ductors or wires will be observed, when supported, to be electron-optically centered over each of the phosphor coated strips which produce the red and the blue light.
  • the grid conductors When so centered, if different potentials be applied to the grid conductors centered relative to the phosphor strips and if an electron flow in the form of one or more cathode ray scanning beams be directed toward the tube target through the grid, it can be appreciated that, depending upon which of the grid conductors is the more positive relative to some equilibrium point or element, establishes thepath of the electron beam toward the target and thus, the light color which becomes observable.
  • the grid conductors are maintained at such state that no electrical potential difference exists between them any electron ilow toward the target will be centered generally midway between the conductors. For the example assumed in what has heretofore been stated this would result in the production of green light. To this end the various conductors ofthe grid may be considered, for the example illustrated, to be spaced from each other by spacings of between onehalf and an entire elemental area to be resolved upon the target surface in the creation of the image.
  • the grid wire spacing between centers is of the general order of l5 mils.
  • a wire size of the order of approximately 2 to 3 mils diameter is satisfactory. Wire sizes of such diameter are extremely light. They are, however, reasonably strong in tension so that with suitable stretching as initially positioned, the tautness of the relationship between the wires may be maintained and the wires will be prevented from sagging and swaying with respect to each other and the target surface if adequate anchoring is provided.
  • a further object of the invention is that of providing an improved arrangement whereby connections may be made from the conductors of the grid to external supports so that the conductors of the grid may be formed into sets which are interleaved with respect to each other and adapted for connection to terminal points in the tube wall, to which terminal points conections may be made to external circuits.
  • a further object of the invention is that of providing a grid structure for a cathode day tube in which the various grid conductors may be permanently secured to suitable supports, which supports, in turn, may be appropriately located in xed relationship relative to a target area with which they are to be used.
  • a further object of the invention is that of providing a grid structure for a cathode ray tube in which unformity of spacing of the grid conductors is insured both with respect to adjacent conductors and with respect to the target area upon which the images are to be developed.
  • Still a further object of the invention is that of providing a grid structure for cathode ray tubes adapted to produce images in either color or monochrome which is of such a character as to insure carrying out of eicient production methods including rapid assembly, production line operation and reduced manufacturing costs.
  • Fig. 1 represents an elevation, partly in section and in extremely schematic form, of a cathode ray image producing tube in which the invention is utilized;
  • Fig. 2 is a plan View, partly broken away, of a section of the grid structure of the present invention looking at the grid structure as depicted by Fig. l from the direction of the tube base;
  • Fig. 3 is an elevational sectional view of the grid structure of Fig. 2 taken along the line 3 3 thereof;
  • Pig. 4 is a view, partially in section, taken along the line 4-4 of Fig. l looking in the direction of the arrows to illustrate illustratively the positioning of the grid structure within the tube envelope;
  • Fig. 5 is a greatly enlarged sectional view to illustrate the relative relationship of the target surface, the grid conductors or wires positioned relative thereto and the grid support component for locating the grid conductors relative to each other and to the target surf-ace land for supporting the grid components relative to the target;
  • Fig. 6 is a sectional view patterned generally to follow the arrangement of Fig. 3 and showing particularly one t form of connection of the grid conductors for attachscale, a modified manner of connecting the grid conductors to a common connector, this view representing a modication of the connecting forms represented in Figs. 2 and 6.
  • a grid structure is arranged for positioning in the enlarged bulbous end of a highly evacuated cathode ray tube envelope, generally designated at 12.
  • the form of tube envelope here depicted is purely schematic, and without departing from its scope it may be either of the well known metal or vitreous type.
  • the tube embodies a substantially truste-conical shaped bulbous portion 13 terminating in a substantially flat viewing window 14 which is viewed from the direction shown by the arrow to the right thereof in Fig. l.
  • This viewing window 14 is usually formed of glass so as to become transparent to the viewing of an image which may be created upon a phosphor coating contained within the tube envelope. construction the phosphor coating is applied directly to the inner surface of the viewing window 14. 1n an alternative construction (which is herein particularly shown) the coating may be formed upon a transparent target surface generally designated at 15 which is appropriately supported within the tube envelope and is close to the viewing window as is conveniently possible for ready mounting and simplified tube construction.
  • the construction herein shown is one which offers some advantages from the standpoint of simplified tube manufacture although it is to be understood that where the tube is formed with a generally flat window 1.4 the phosphor coating may be applied thereto, as above suggested, so that the showing hereinmade is to be regmded as illustrative rather than limiting.
  • the truste-conical section 13 merges into a neck portion 16 to the end of which, at substantially the end of the completion of the manufacturing processes, there is supplied a base 17. Suitable contact prongs or pins 18 are fastened to the base for attachment to a tube holder or for connection toy an external circuit. There is contained within the tube neck 15 one or more suitable electron guns from which electrons are adapted to emerge to be directed toward the target for impacting it.
  • the electron gun as is well known, comprises the usual cathode, together with its heater, and selected accelerating or anode electrodes in combination with various grids or modulating electrodes. In some tubes there is a second anode component which serves to accelerate the developed electron iiow as it is formed.
  • the electron gun forms the emitted electron ow into a single ⁇ beam of electrons whichl is directed toward the target; surface through the major portions of the distance between the gun. and target under the influence of an accelerating voltage somewhere in the region of about. one-quarter that which wilt be acquired at the instant of target impact.
  • an accelerating voltage somewhere in the region of about. one-quarter that which wilt be acquired at the instant of target impact.
  • the developed electron beam may be deiiected in its path toward the target 15 bidimensionally under the infiuence of developed electromagnetic or electrostatic fields, or a combination of both, act-ing in direction-s normal to each other and normal to the direction of flow of electrons from the electron gun toward the target.
  • a tube of the character herein described is. one where- In many forms of tube 1 it reaches the target.
  • a grid structure in a grid structure, conventionally shown at 11, is adapta ed for positioning adjacent to the phosphor coated tube target 15.
  • a grid electrode is adapted to operate (subject to changes to provide different color effects later to be described) at a potential relative to the electron source which is approximately that of the anode of the electron gun.
  • a metallic lm is of an electron permeable character to permit electrons to pass therethrough to excite the phosphor coating on the target but the film forms a barrier against ions reaching the target to produce thereon the well known. and objectionable ion spot.
  • the metallicmit coating being conducting in character permits the application of a relatively high voltage measured relative to the grid structure to the target. This operating voltage difference may be in the general neighborhood of 2 to 4 times that voltage difference existing between the electron source and the final accelerator of the electron gun which has already been described as adapted to operate at substanti'ally the samer potential as the grid.
  • the target area 1-5 is a vitreous material there may be supported adjacent to opposite edges of the raster area suitable grid wire support rodsV 21.
  • these support rods are positioned to extend: parallel to the long dimension of the raster, conventionally represented particularly by the dimension L in- Fig. 4.
  • Such rods in their preferred form are cross-sectionally of any desired form but it has been found that a rod of circular cross-section cut generally through its center to provide a attened face to be secured to ⁇ the target proper isk particularly suitable. This gives a generally semicircular rod cross-section for securement to the target base.
  • the grid support rods 21 areV secured. to ⁇ the vitreous target element 15 to extend in directions parallel to each other. Spacing is provided between the rods corresponding to the span desired for Jthe grid' wiresv across the raster to be traced.
  • suitable grooves or recesses 23 are formed in any suitable manner so as to receive and locate the; gridy conductors or wires represented atY 25. While various. constructional methods may be adapted to form the slots or grooves it is essential that there be a high degree of precision in the spacing if extremely high fidelity operation is to result in the iinal tube.
  • the grooves or recesses are cut by spacing the rod 23, prior to its assembly within the tube, adjacent to a multiplicity of cutting heads or grinding edges in the form of a rotating spindle or mandrel.
  • the rod is then moved into contact with the rotary cutting or grinding edge and the grooves are formed to the desired depth.
  • a cutting or grinding edge so-formed is of an extremely hard cutting or grinding material so that the relatively soft glass may be cut with the grooves spaced precisely uniformly from each other to coincide with the spacing or grinding edges of the machined cutter. This manner of constructing the rods is not illustrated but is mentioned merely as one manner of fabricating the rods.
  • the rods may be of a type which is photosensitively opacifiable.
  • a glass of such character is frequently known as photosensitive opal glass.
  • the Corning Glass Works, of Corning, New York is a manufacturer of one type of this glass.
  • the glass is of a type which may be exposed to ultraviolet radiations through an appropriate and extremely accurately formed photographic negative.
  • the negative has the desired image or pattern of the desired slots or grooves thereon, so that when the glass is exposed the exposure which takes place is one whereon there has been photographed extremely accurately an image of the recesses or slots in which it is desired to locate and hold the grid Wire 25. The spacing of such slots coincides with that already explained.
  • the depth of the image created is controllable with equal ease by varying the duration and intensity of the exposure of the glass to the ultraviolet radiation through the negative.
  • the time selected is determined experimentally. When it is known that the depth of the slots in the rods 21 is to be made just suicient accurately to locate the wire the exposure time may be set accordingly.
  • the slot has been made deeper than the diameter of the conducting element used to form the grid, while in the arrangement shown by Fig. 6 the slot in the rod 21 is made to a depth substantially corresponding to the diameter of the conductor forming the grid. This is a matter of choice.
  • the vitreous rod member must be attached to the transparent target plate 15.
  • the phophor-coating in the form of the strips arcieri:
  • the coating has applied to it the conducting metallic iilm deposited in any suitable manner customarily used in tube manufacturing processes.
  • the vitreous rods 21 are chosen of such diameter or thicknes that with the rods in place the bottom of the slot into which the conducting elements of the grid are to be placed is at such distance from the plane of the target as to provide a separation between the metallic lm on the target and the grid wires which corresponds to the desired spacing between the grid and the target. In most tube types this distance is only a fraction of an inch (generally about ve times the Width of a sequence of phosphor-coated strips forming one complete color cycle).
  • the glass from which the rods 21 are formed shall have a coefficient of expansion which is either identical or substantially identical to that of the transparent target plate 15, so that there may not be any difference in expansion which would cause the rod to crack due to heat to which the tube is subjected in the bake-out process.
  • the glass rods 21, when positioned at the proper spacing from one another and parallelly alined in such a way that conducting members 2S of the grid when stretched between the rods and located in the formed slots which extend precisely parallel to the edges of the phosphor strips, it is possible to fuse the glass rods 21 and the target plate 15 into a unitary mass.
  • Other methods of attachment such as K-sil (potassium silicate) or solder glass, to mention but two, are also available.
  • the coetiicients 4of expansion of the glass rods -21 tand the transparent target plate 15 may not precisely correspond.
  • a so-called graded seal be provided by the two components, in order to distribute stresses and prevent breakage due to dilference in expansion of the two components.
  • Graded seals are too well known in the art to require detailed description, but it must be borne in mind that in making such a graded seal and providing the grading between the rod component per se and the transparent support base, allowance must be made for the seal to occupy a finite space in order that the separation between the two grid conductors and the metallic film coating the phosphor on the target plate shall be that desired. This is a manufacturing technique, however, which need not be explained at this time in any further detail.
  • the coeicient of expansion of the vitreous target surface 15 may be matched to correspond to that of the grid support rods, such as the so-called photographic glass rods. Changes in the coetlicient of expansion of the vitreous material of which the target is formed may readily be introduced in the glass making process, although it is generally the more d'cult to change the coetlicient of expansion of the rods to correspond to that of the target. In any event, the problem of different coeliicients of expansion of the rods and the target surface is not critical.
  • Fig. 5 shows the dimension S which is to be maintained accurately throughout the lenght of the grid conductors.
  • the conducting strands or wire 25 from which the grid is formed are positioned to bridge r and lit into the slots 23 and then stretched tightly there- 9 in, so that any sagging of the grid conductors or wires in the space between the two insulating rods 21 is eliminated.
  • the wires or conductors when held in such location are then securely anchored.
  • wires or conductors 25 are then so sealed in the spacing rods 21, and where it is desired to operate the grid in such a way that it may be used either with a tube to produce color images or to produce images in monochrome, alternate wires are connected together.
  • One set of wires is secured to a header conductor 27 with the other set secured to a similar header conductor 2S, at opposite ends of the wires. Wires of the different sets at the ends not connected to the headers may then be trimmed at points close to the spacing rods as indicated particularly by Fig. 2.
  • Suitable connections from each of the headers 27 and 28 to lead exteriorly of the tube envelope may then be provided, as conventionally shown at 29, with the connection leading out through the seal in the tube wall in any desired fashion, or alternatively, leading to a button connection within the tube to the opposite side of which a cap may be secured to provide connection to external circuitry 29 and 30.
  • headers 27 and 28 may be supported from the target member itself
  • a construction of such type is usually preferable.
  • the construction is generally such that the wires or conductors from which the grid is formed are of themselves not sufficiently rigid to support the headers so that, generally speaking, such headers may be fastened in any desired fashion to the plane of the target in a manner similar to bake-out process to compensate for the difference in expansion of the glass and the header.
  • This construction per se is not a part of the invention and, therefore, is not illustrated in further detail.
  • bracket members 31, 32 which may be in the form of ribs.
  • bracket members are metal and the frusto-conical portion 13 of the bulb 12 is also metal, they may be suitably welded to the interior wall of the tube and then secured to the transparent target plate, by any conventional or convenient glass-to-rnetal seal permitting the proper and desired expansion.
  • the glass target may be sur rounded with a metal frame and the connection then made to the frame.
  • the support rods or ribs 31 10 and 32 are usually also formed of vitreous material having a like or approximately like coeicient of expansion to/that of the target. The assembly then can be fused to bond the tube wall and the target plate.
  • the spacer rods 21 With the grooves or notches cut therein merely as a cradle or saddle into which the grid conductors are positioned and located. Then there is preferably attached by fusing or otherwise securing to the surface of the base plate a rod to which conductive connection may be established.
  • These rods are indicated particularly at Fig. 6 as the metal rods 33, 35', which are secured to the outer edges of the transparent target plate 15 by any suitable glassto-metal seal.
  • Such metal rods may be held in brackets or in any other manner to permit expansion and contraction where they are of a different expansion characteristic than the base.
  • the grid wires are then arranged so that alternate wires overlap the conductor 33, and other alternate wires overlap the conductor 35, in which position the wires are suitably welded or otherwise permanently connected.
  • This type of permanent connection insures, first, good electrical contact between the wires of the grid and the conductor, and, second, a permanent positioning of the grid wires in a stretched and taut state relative to the plane of the target.
  • the conducting rods 33 and 35 may be replaced by an insulating rod such as that shown in Fig. 7, where, the insulating rod 39, preferably in the form of a vitreous member, is fused or otherwise appropriately secured to the target plate 1S.
  • the vitreous rod 39 has extending through it and appropriately held therein a conducting cord or connector 4l; extending throughout the length thereof.
  • the conducting member at one point 'on the surface of the vitreous rod 39 extends just slightly outwardly from the periphery, in order to permit the establishment of a suitable wel-ded yor brazed connection 43 between the conducting wire 25 of the grid and the conductor 41.
  • a grid structure for a cathode ray tube wherein there is included within the tube envelope an electron source for developing a beam ⁇ of cathode rays and a transparent target area having on one side thereof a coating adapted 11 Y to receive the electrons of the source and to become luminescent with impact of said electrons thereon, comprising a plurality of insulating support rods parallelly positioned and secured to the target in spaced relationship with respect to each other and each faced toward the electron source, the rod spacing corresponding approximately to one dimension of a raster adapted to be traced upon the target area, each rod having formed therein a plurality of slots formed to substantially uniform depth and extending with generally regular separation from one end of the rod to the other, a plurality of wir@ strands uniformly spaced relative to each other bridging said support rods and resting thereupon inwardly to the slot depth, means provided by each rod for locating each wire relative to the rod and the target to form a plurality of parallelly located wires spacedfrom each other

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US343834A 1953-03-23 1953-03-23 Grid structure for television tube Expired - Lifetime US2791710A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NLAANVRAGE7808455,A NL185725B (nl) 1953-03-23 Thermoplastische materialen en voorwerpen daaruit.
BE526096D BE526096A (de) 1953-03-23
US343834A US2791710A (en) 1953-03-23 1953-03-23 Grid structure for television tube
GB34863/53A GB757810A (en) 1953-03-23 1953-12-15 Grid structure for television tube
FR1091379D FR1091379A (fr) 1953-03-23 1954-01-13 Structure de grille pour tube de télévision en couleurs
DEC9072A DE1011918B (de) 1953-03-23 1954-03-20 Kathodenstrahlroehre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US343834A US2791710A (en) 1953-03-23 1953-03-23 Grid structure for television tube

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US2791710A true US2791710A (en) 1957-05-07

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US343834A Expired - Lifetime US2791710A (en) 1953-03-23 1953-03-23 Grid structure for television tube

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US (1) US2791710A (de)
BE (1) BE526096A (de)
DE (1) DE1011918B (de)
FR (1) FR1091379A (de)
GB (1) GB757810A (de)
NL (1) NL185725B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998033A (en) * 1957-02-12 1961-08-29 Sylvania Electric Prod Apparatus for producing cathode ray tubes
US5085606A (en) * 1989-04-12 1992-02-04 Zenith Electronics Corporation Method of manufacture for post-mask deflection type tension mask color cathode ray tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE630956A (de) * 1962-04-18
FR2515422A1 (fr) * 1981-10-28 1983-04-29 Hyperelec Grille pour tube electronique et procede de realisation

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US1465381A (en) * 1918-11-02 1923-08-21 Western Electric Co Electrode and its construction
US2064169A (en) * 1936-01-03 1936-12-15 Sovereing Machinery Company Method of and apparatus for producing radio tube grids
US2338036A (en) * 1941-08-08 1943-12-28 Bell Telephone Labor Inc Cathode ray device
US2446791A (en) * 1946-06-11 1948-08-10 Rca Corp Color television tube
US2463535A (en) * 1946-03-22 1949-03-08 Bell Telephone Labor Inc Electron discharge device
US2535307A (en) * 1946-04-05 1950-12-26 Philco Corp Grid-controlled electron tube
US2549551A (en) * 1948-01-15 1951-04-17 Bell Telephone Labor Inc Grid electrode structure and manufacturing method therefor
US2568448A (en) * 1947-09-23 1951-09-18 Gen Electric Parallax correction in color television
US2653263A (en) * 1952-01-08 1953-09-22 Chromatic Television Lab Inc Color control grid structure for cathode-ray tubes
US2683833A (en) * 1952-09-02 1954-07-13 Chromatic Television Lab Inc Electrode structure
US2695372A (en) * 1951-10-23 1954-11-23 Chromatic Television Lab Inc Grid structure for cathode-ray tubes
US2701847A (en) * 1951-10-02 1955-02-08 Machlett Lab Inc Color television tube structure
US2738436A (en) * 1952-09-02 1956-03-13 Chromatic Television Lab Inc Electrode structure

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US1937202A (en) * 1926-07-17 1933-11-28 Union Nat Bank Of Pittsburgh Anticapacity thermionic tube
DE820614C (de) * 1950-01-14 1951-11-29 Siemens & Halske A G Elektronenroehre, insbesondere feur sehr kurze Wellen

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US1273630A (en) * 1918-02-20 1918-07-23 Gen Electric Electron-discharge apparatus.
US1465381A (en) * 1918-11-02 1923-08-21 Western Electric Co Electrode and its construction
US2064169A (en) * 1936-01-03 1936-12-15 Sovereing Machinery Company Method of and apparatus for producing radio tube grids
US2338036A (en) * 1941-08-08 1943-12-28 Bell Telephone Labor Inc Cathode ray device
US2463535A (en) * 1946-03-22 1949-03-08 Bell Telephone Labor Inc Electron discharge device
US2535307A (en) * 1946-04-05 1950-12-26 Philco Corp Grid-controlled electron tube
US2446791A (en) * 1946-06-11 1948-08-10 Rca Corp Color television tube
US2568448A (en) * 1947-09-23 1951-09-18 Gen Electric Parallax correction in color television
US2549551A (en) * 1948-01-15 1951-04-17 Bell Telephone Labor Inc Grid electrode structure and manufacturing method therefor
US2701847A (en) * 1951-10-02 1955-02-08 Machlett Lab Inc Color television tube structure
US2695372A (en) * 1951-10-23 1954-11-23 Chromatic Television Lab Inc Grid structure for cathode-ray tubes
US2653263A (en) * 1952-01-08 1953-09-22 Chromatic Television Lab Inc Color control grid structure for cathode-ray tubes
US2683833A (en) * 1952-09-02 1954-07-13 Chromatic Television Lab Inc Electrode structure
US2738436A (en) * 1952-09-02 1956-03-13 Chromatic Television Lab Inc Electrode structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998033A (en) * 1957-02-12 1961-08-29 Sylvania Electric Prod Apparatus for producing cathode ray tubes
US5085606A (en) * 1989-04-12 1992-02-04 Zenith Electronics Corporation Method of manufacture for post-mask deflection type tension mask color cathode ray tube

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FR1091379A (fr) 1955-04-12
NL185725B (nl)
BE526096A (de)
DE1011918B (de) 1957-07-11
GB757810A (en) 1956-09-26

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