US2796546A - Damp rod construction for cathode ray tube grid structure - Google Patents

Damp rod construction for cathode ray tube grid structure Download PDF

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Publication number
US2796546A
US2796546A US364778A US36477853A US2796546A US 2796546 A US2796546 A US 2796546A US 364778 A US364778 A US 364778A US 36477853 A US36477853 A US 36477853A US 2796546 A US2796546 A US 2796546A
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United States
Prior art keywords
grid
wires
rod
wire
cathode
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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
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US364778A
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English (en)
Inventor
Howard R Patterson
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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 NLAANVRAGE8403385,A priority Critical patent/NL188664B/xx
Priority to BE529971D priority patent/BE529971A/xx
Priority to NL96507D priority patent/NL96507C/xx
Application filed by Chromatic Television Laboratories Inc filed Critical Chromatic Television Laboratories Inc
Priority to US364778A priority patent/US2796546A/en
Priority to GB17178/54A priority patent/GB758770A/en
Priority to FR1107977D priority patent/FR1107977A/fr
Priority to DEC9537A priority patent/DE942567C/de
Application granted granted Critical
Publication of US2796546A publication Critical patent/US2796546A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/46—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • H04N9/26—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen

Definitions

  • the present invention relates to cathode-ray tubes of the type adapted to eifect the reconstitution of polychrome images. More particularly, the invention relates to cathode-ray tubes having a grid of coplanar parallel wires positioned adjacent to a striped phosphor screen or target electrode. It also relates to means for enhancing the color fidelity of the image reproduced on this screen by inhibiting any tendency the wires of the grid may have to vibrate as a result of the cyclic application of electrical potentials thereto and/or as a result of any shock excitation of either a physical or electrical nature.
  • Cathode-ray tubes constructed with a grid of parallel wires located adjacent to a striped phosphor screen are already'known in the art and serve to focus the beam electrons into a pattern of thin parallel lines registered with the phosphor strips of the screen.
  • the PDF (postdeflection-focusing) type of cathode-ray tube operation has been set forth by Ernest 0. Lawrence in various of his copending United States patent applications, such as Serial No. 219,213, filed April 4, 1951, and Serial No. 234,190, filed June 29, 1951 (now respectively U. S. Patent No. 2,692,532, granted October 26, 1954, and U. S. Patent No. 2,711,493, granted June 21, 1955).
  • the tube may incorporate a screen or target electrode made up of a relatively large number of very narrow component-color phosphor strips and laid down in a predetermined sequence and intended to luminesce, when impacted by the cathode-ray beam, in colors such as red, green, blue, green, red, green, for example.
  • a screen or target electrode made up of a relatively large number of very narrow component-color phosphor strips and laid down in a predetermined sequence and intended to luminesce, when impacted by the cathode-ray beam, in colors such as red, green, blue, green, red, green, for example.
  • the color of a phosphor what is meant is the color of the light emitted therefrom which reaches the eye of the observer.
  • the phosphors are then aluminized, or the screen in some other manner is provided with an electrically conductive coating.
  • a grid assembly is located adjacent to such phosphor screen.
  • the grid may be made up of parallel coplanar wires, and so related to the phosphor strips that, in an electron-optical sense, there is a wire aligned with each blue strip, and similarly a wire aligned with each red strip.
  • the red wires are connected to a common terminal, while the blue wires are similarly joined together electrically.
  • the electrons Will strike the blue strips when the wires associated with such strips are relatively positive with respect to the red wires.
  • Different component coolrs are thus displayed 3C1 cording to the potential difference (if any) existing between the two sections of the grid wire assembly.
  • a wire of given length having a certain natural resonant frequency
  • the wire segments between the constraining points will have higher resonant frequencies corresponding to their shorter lengths. If these increased resonant frequencies are sufliciently higher than the driving frequency (i. e., the rate of change of potentials applied to the wires) then the tendency of the wire seg-- ments to vibrate will be materially reduced, and the amplitude of any vibration which does occur will be much lower.
  • One structure designed in accordance with the teaching of the identified Cook application comprises a node bar of insulating material, such as glass, extending across the grid wires, the latter being rigidly secured to the bar at spaced points.therealong.
  • the bar is given a conductive coating over. the portion of its surface which is. out of contact withthe wires. The undesirable shadow region is thus filled in with electrons which would normally impinge other points on the target area.
  • the linear configuration of the damp rods causes the interweavingprocess to produce two substantially coplanar sets (or groups) ofgrid wires, with alternate'wires being displaced in the same general direction normal to the plane of the base plate.
  • Application of color switching voltagesto these two sets of wires may, in some cases, result inslight color fringing due to the difference in raster size of the individual component-color fields. This is dueto the .greater efiect on the electrons in the'scanning beam of the grid Wires lying nearest to the electron gun 'ofthe cathode-ray tube, considered wtih respect to'the furthest,.or hidde'nj" grid.
  • These means may generally be said to involve use of voltages on the two sets ofgridwires which are unbalanced to that particular degree. required to bring the respective raster areas into substantial coincidence.
  • Oneobject of the present invention is to: provide an improved'form of cathode-raytube suitable for the reconsitutiontof polychrome images;
  • An additional object of the:present invention istoaccomplish the above objective while at the sametimemaintaining the coplanar relationship of the grid wires;
  • a still further object of: the present invention isto provide, in a polychrome. cathode-ray tube having a color-controlgrid. structure of coplanar parallel wires, at least one dampingi element of non-linear configuration interwoven with the Wires of-the' color-control grid.
  • FIG. I is apartly schematic representation'of-one form:
  • Figure 2 is an enlarged'view of a portion of Figure 1;
  • Figure 3 is aperspective view of a portionof the wire grid assembly of Figure 1, showing in greater detail the interwoven relationship betweenthe" grid wires and damp rods;
  • Figure 4 is a sectional view of a portion of Figure 3 along the line 4-4;
  • v Figure 5 is a'plan- View ofap'ortion of Figure 3, showing'one-preferredassociationof the grid WlI'BS' andphosphor' strips.
  • the target electrode-of't-ube 1-0 for ease of illustration, is disclosed as formingpartfofa separateunit or assembly 14mounted in. any suitable manner adjacent to the transparent end wall16 of the tube. end wall 16 when' suitably configured, may itself cornprise the targefel'ect'rode if convenient or desirable.
  • end wall 16 when' suitably configured, may itself cornprise the targefel'ect'rode if convenient or desirable.
  • base plate 18 a phosphor coating 20 thereon, and agrid of parallel color-control conductors 22 adjacent to the phosphor coating 20) is positionedand supported within the tube so that the light produced by impingement of the scanning beam 12 on the phosphor coating may be viewed by an observer through the transparent end wall 16 of the cathode-ray tube.
  • the base plate 18 may be of glass or other suitable material.
  • the phosphor coating 20 is preferably in the form of a plurality of narrow strips which have the property of fiuorescing in different component colors of the image to be reconstituted, these colors, for example, being red, green and blue. These strips are laid down side-byside in a predetermined chromatic sequence. As best shown in Figures 3 and 4, the order chosen for illustration is red, green, blue, green, red, green, etc. This order, however, forms no specific part of the present invention, but is suggested as one order which has proved to be satisfactory.
  • the phosphor coating 20 is then aluminized or otherwise provided with a thin film of electrically-conductive material on the surface toward the source of the impinging electrons.
  • the color-control grid adjacent to the target surface 20 is composed of a plurality of linear conductors, such as the parallel wires 22, aligned with the phosphor strips in a manner best shown in Figures 3 and 5.
  • a small section of the striped phosphor surface 29 of the target electrode is illustrated in Figure 3 in order to permit a. clear showing of the grid wire relationships.
  • each pair of wires may, in an electronoptical sense, he considered as subtending strip areas constituting one color cycle.
  • a potential is applied to the conductive coating on the phosphor surface 20 which is relatively positive with respect to the average, or D.-C., potential of the wires 22 of the grid assembly.
  • This gives rise to a plurality of cylindrical electrostatic lenses, which serve to focus the electrons of the scanning beam 12 in a series of fine lines registered with the phosphor strips.
  • the present invention is obviously applicable to cases where the wires 22 serve either as a color-changing device alone, as will subsequently appear, or as an electrostatic lens assembly per se, as shown for example in patent application, Serial No. 234,190 above referred to.
  • any suitable method may be employed for positioning the wires 22 so that they are adjacent to the phosphor-coated surface 20 of the target electrode, a pair of bars 24 and 26 is shown, each of these bars having on its upper surface a series of equally-spaced grooves for aligning the wires 22 and preventing internal movement at such points.
  • the wires are respectively held taut (as best shown in Figures 1 and 2) by a plurality of hooks forming part of two retaining assemblies '28 secured to the under surface of the transparent base plate 18 beyond the boundaries of the image raster area.
  • one of the principal features of the present invention consists in substantially completely overcoming any tendency toward vibration the wires of a color-control grid assembly of the class described may possess by interweaving one or more rigid rod-"like members between the wires of the color-control assembly, while at the same time retaining the coplanar wire rela- 6 tionship.
  • One such arrangement is shown in Figures l through 5.
  • each of the damp rods 30, 32 and 34 is not only interwoven with the grid wires 22 but in addition is ofiset with respect to each adjoining damp rod or rods in the sense that corresponding convolutions of adjoining rods extend in opposite directions.
  • the construction accordingly is one in which the rod 32, for example, overlies those particular grid wires which the rods 30 and 34 go under.
  • Reference to Figure 5 illustrates this point, and, in Figure 4, the side view of rods 30 and 32 brings out that the former (which lies in back of the rod 32) contacts each grid wire at a point which is diametrically opposed to the point at which each grid wire is contacted by the rod 32.
  • the rod 34 although not shown in Figure 4, occupies a position relatively similar to that of the rod 30.
  • this binding inaterial identified by the reference numeral 36 secures the respective ends of each rod-to whatever number-'of-gr'id wires (such as threeor tour) that-are contaetedbythe'cement. This positions each rod with respect to the wires and prevents any-relative movement therebetween 'in the plane of the latter. Inasmuch as the two extremities of each rod respectively lie outside the raster area of the target electrode,thereis no noticeable eifect produced by -the cement on the image presented to an observer.
  • any material maybe used for the damp rods 30, 32 and 34 which will produce satisfactory results, especially if this material be of a vitreous nature.
  • One substance which has been found to be especially suitable is what is known commercially has ..Gl2-glass.
  • V1/ V2 is roughly equal to A, where V2 isthe potential difierence from the cathode to screen 20 and V1 is the mean potential difference-from the cathode to the wire grid .22. Reducing this voltage ratio causes an increasing amount of shadow.
  • vibration-inhibiting element for .a cathode-ray tube designed for the reconstitution of polychrome images and having-a grid structure of coplanar parallel wires lying between the cathode-ray beam developingmeans of said tube and the target electrode scanned tthereby and substantially adjacentto the target, .said vibrationinhibiting element comprising a nonlinear rod of substantially inflexible insulating material extending substantially transverselyto the parallel wires of said vgrid structure and interwoven therebetweenin such a manner as to retain a coplanar wire relationship.
  • a vibration-inhibiting assembly for a cathode-ray tube designed for the reconstitution of polychrome images said tube having a planar-surfaced target electrode and a grid structure ofcoplanar parallel wires lying adjacent to the -planar surface of said target electrode, said vibration-inhibiting assembly including a plurality of ;rodlike insulating members each having a permanent .Zigzag configuration, each extending substantially transversely to the parallel wires of said grid structure-and interwoven therebetween, the zig-zag configuration of each of the said rod-'likemembers being such that the interwoven relationship of each said zigzag member with the parallel wires of .said grid structureresults in the iormer contacting each of the said wires and at the same .timesubtantially retains the said'coplanar grid wire relationship.
  • A'vibration-inhibiting assembly in which any selected one of the said plurality -of rod-like members contacts .each particular wire of said grid structure at a point which is substantially diametrically opposed to the point at which such particular wire is contacted by the one or more rod-like members lying adjacent to the said oneselected member.
  • a zig-zag damp rod of insulating material for inhibiting vibration of the tautly stretched linear conductors forming a color control grid structure of a cathode-ray tube designed for the production of polychrome images said linear conductors lying adjacent to the target electrode of said cathode-ray tube, said damp rod extending transversely to the conductors of the grid and interwoven therewith and being essentially of a linear nature and substantially inflexible but being bent in-and-out at points substantially corresponding in number to the number of linear conductors making up said grid structure, the direction of bending of sa-iddamp rod being the same at alternate points, so that the said bent rod 'is substantially symmetrical about its longitudinal axis and adjacent conductors of the grid lie on opposite sidesof the rod.
  • a cathode-ray'tube designed for the production of polychrome im-ages,..the combination of a color-control grid-structure of parallel wires arranged in coplanar rela tion in a plane adjacent to the target electrode of said cathode-ray tube, and at least one rod-like element of substantially inflexible insulating material respectively bent in-and-out at equally spaced points corresponding in number essentially to the number of parallel wires making up said grid structure, said rod-like element being adapted for interweaving with the said parallel wires without disturbingthe coplanar relationship of the latter, whereby the tendency of said-wires to vibrate whencolorcontrol potentials are applied to said grid structure will be strongly inhibited.
  • a vibration-inhibited color grid assembly for a cathode-ray tube adapted for thereconstitution of images in color on the tube target surface which comprises a color-control grid structure constituted of a multiplicity of linear conductors all in substantially coplanar 'relationship and supported from and located by the tube wall in tautly stretched'relationship adjacent to the target, a non-linear rod of insulating material extending transversely to the linearconductors of the grid and interwoven therewith, the rod non'linearity being of a-generally zig-zag configuration with a zig-zag pitch being such as to place adjacent linear conductors of the grid on opposite sides of the rod and alternate linear 'conductors on the same side of the rod and the-displacement of each zigzag bend from linearity being-such that when each linear conductor of the grid rests adjacent to the rod on oneside or the other thereof-and the'group of linear conductors forming :the grid is maintained by the rod in substantially non-vibratory

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US364778A 1953-06-29 1953-06-29 Damp rod construction for cathode ray tube grid structure Expired - Lifetime US2796546A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NLAANVRAGE8403385,A NL188664B (nl) 1953-06-29 Condenserende verwarmingsketel.
BE529971D BE529971A (fr) 1953-06-29
NL96507D NL96507C (fr) 1953-06-29
US364778A US2796546A (en) 1953-06-29 1953-06-29 Damp rod construction for cathode ray tube grid structure
GB17178/54A GB758770A (en) 1953-06-29 1954-06-11 Damp rod construction for cathode-ray tube grid structure
FR1107977D FR1107977A (fr) 1953-06-29 1954-06-22 Dispositif antivibratoire pour tubes à rayons cathodiques
DEC9537A DE942567C (de) 1953-06-29 1954-06-22 Mehrfarbenfernsehroehre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US364778A US2796546A (en) 1953-06-29 1953-06-29 Damp rod construction for cathode ray tube grid structure

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US2796546A true US2796546A (en) 1957-06-18

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US364778A Expired - Lifetime US2796546A (en) 1953-06-29 1953-06-29 Damp rod construction for cathode ray tube grid structure

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US (1) US2796546A (fr)
BE (1) BE529971A (fr)
DE (1) DE942567C (fr)
FR (1) FR1107977A (fr)
GB (1) GB758770A (fr)
NL (2) NL188664B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913613A (en) * 1956-08-03 1959-11-17 Gen Electric Electrode structure for color cathode ray tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL196371A (fr) * 1954-04-19
FR1165419A (fr) * 1955-10-06 1958-10-24 Thomson Houston Comp Francaise Tube à rayons cathodiques pour la reproduction des couleurs
DE1149383B (de) * 1961-05-19 1963-05-30 Siemens Ag Farbbildroehre mit Paralleldraht-Gitter

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2072638A (en) * 1934-01-30 1937-03-02 Telefunken Gmbh Electrode mounting for discharge tubes
US2231691A (en) * 1937-11-30 1941-02-11 Rca Corp Electron multiplier
US2416056A (en) * 1944-02-21 1947-02-18 Heinz E Kallmann Raster screen
US2441791A (en) * 1944-07-07 1948-05-18 Akron Standard Mold Co Strip feeding mechanism
US2461515A (en) * 1945-07-16 1949-02-15 Arthur B Bronwell Color television system
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
US2757303A (en) * 1954-04-19 1956-07-31 Chromatic Television Lab Inc Damp rod construction for cathode-ray tube grid structures

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2072638A (en) * 1934-01-30 1937-03-02 Telefunken Gmbh Electrode mounting for discharge tubes
US2231691A (en) * 1937-11-30 1941-02-11 Rca Corp Electron multiplier
US2416056A (en) * 1944-02-21 1947-02-18 Heinz E Kallmann Raster screen
US2441791A (en) * 1944-07-07 1948-05-18 Akron Standard Mold Co Strip feeding mechanism
US2461515A (en) * 1945-07-16 1949-02-15 Arthur B Bronwell Color television system
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
US2757303A (en) * 1954-04-19 1956-07-31 Chromatic Television Lab Inc Damp rod construction for cathode-ray tube grid structures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913613A (en) * 1956-08-03 1959-11-17 Gen Electric Electrode structure for color cathode ray tube

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Publication number Publication date
GB758770A (en) 1956-10-10
DE942567C (de) 1956-05-03
NL96507C (fr)
NL188664B (nl)
FR1107977A (fr) 1956-01-06
BE529971A (fr)

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