US2170944A - Multicathode ray discharge device - Google Patents

Multicathode ray discharge device Download PDF

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Publication number
US2170944A
US2170944A US145432A US14543237A US2170944A US 2170944 A US2170944 A US 2170944A US 145432 A US145432 A US 145432A US 14543237 A US14543237 A US 14543237A US 2170944 A US2170944 A US 2170944A
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plates
units
chamber
electrode
vessel
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US145432A
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English (en)
Inventor
Myron S Glass
Douglas A S Hale
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AT&T Corp
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Bell Telephone Laboratories Inc
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Priority to US145432A priority Critical patent/US2170944A/en
Priority to GB5172/38A priority patent/GB500005A/en
Priority to FR838528D priority patent/FR838528A/fr
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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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane

Definitions

  • cathode ray devices of the multi-unit type it is advantageous to coordinate the cathode streams on the screen or other reproducing surface without distortion so that various aspects of the same or diiierent phenomena may be accurately interpreted.
  • An object of this invention is to assemble the multi-unit system of a cathode ray discharge device in such a manner that distortion eiects are substantially eliminated.
  • Another object of the invention is to fabricate the multi-unit system of such a device as a compact unitary structure so that it is rigidly maintained in position in the device.
  • a plurality of electron gun units are consolidated into a rigid unitary structure supported from a stem and are provided with a common accelerating electrode which sets up a uniform and identical field for each stream of electrons projected toward the screen of the device.
  • the accelerating electrode also serves as a supporting base for a deiiector plate unit for each gun unit to insure symmetrical alignment of the plates with respect to the gun units.
  • the several sets of plates are electrically independent, in so far as they aiect the adjacent electronic streams, since, in accordance with this invention, shields are interposed between the adjacent sets to avoid distortion of the streams or ineiiicient control in each deector plate unit.
  • a feature of the invention relates to the rigid alignment of the several electron producing gun units as a consolidated assembly to insure that the beams will be in paraxial relation toward the screen on the end of the device. This is accomplished by joining the units together by connecting members which are attached to supports extending from a stem of the tube. This arrangement overcomes mechanical strains on the various conductors extending through the press of the stem which supply the voltages to the aggregation of elements comprising the plurality of velectron gun assemblies and also avoids misalignment of the units due to mechanical stresses.
  • Another feature of the invention relates to the construction ofthe accelerating electrode assembly to insure eicient and collateral acceleration of the electron beams emerging from the electron guns.
  • This assembly comprises a common metallic member having apertures corresponding to and aligned with the anodes of the electron gun units, which is secured to a tubular member supported on an extension of the vessel concentric with the stem and exterior wall of the device.
  • This arrangement insures an accelerating eld of equal magnitude for all the streams of electrons being projected toward the screen of the device and increases the eiciency of transmission by providing a eld of uniform strength by virtue of the shielding eiiect of the tubular member.
  • a further feature relates to the rigid and compact assembly of the deector plate unit and comprises a supporting member superimposed on the common accelerating member, which is provided with slots to receive the different pairs of transverse deflector plates to maintain them in unifc rm and cooperative relation to the electron passages in the accelerating electrode assembly.
  • the main dei'lector plates depend from the supporting member, while the 'sweep or time-axis plates eX- 'tend above the supporting member.
  • the latter plates are accurately aligned in coplanar relation by connecting bars which are interlocked with transverse shielding plates located intermediate adjacent sets of sweep plates.
  • Fig. 1 represents a complete embodiment of the invention with different portions of the glass vessel broken away to show the internal assembly and relation of the multi-cathode stream electrode unit;
  • Fig. 2 is an enlarged perspective view of the electrode unit of this invention showing the detail assembly with respect to the portions of the vessel which are shown in broken lines in order to more clearly illustrate the structural elements of the assembly;
  • Fig. 3 is an enlarged perspective view of the deector plate assembly, shown partly in exploded fashion, to illustrate the detail components of the assembly;
  • Fig. 4 is a plan view of the position of the electrode assembly in the vessel andthe various conductcrs of the electrodes and represents a view takcnonthelinel-lofll'lgnl;
  • a Fig. 6 is an enlarged view in elevation showing, partly in section, the gun assembly and the accelerating electrode.
  • Flg.7 isaplan view of themounting of the gun ase'smblytakenontheline'I-loflilgand showing the connections to certain elements thereof;and y' l'lg.8shows inelevationthedetail structure ofaportionofoneofthegununitsoflllg.6.
  • Referringtoizhedrawingsandlllgs.1and2 Jection portion il which terminates in a large diameter dome portion l2 and an extension portion Il forming a continuation of the body portion Il.
  • the cylindrical portion IlV and the conical portion Il are provided with an interior coating Il, preferably of a conductive substance, such las graphite, which is applied to the walls of the tube as a Ycolloidal mixture and dried thereon.
  • 'Ihe dome portion of the vessel I2 is provided with a nuorescent coating Il, such as willemite. calcium tungstate, zinc silicate, or mixtures thereof, or any other suitable fluorescent substance or composition.
  • tubular extension Il is provided with a reentrant stem Il and also provided with a coextensive but longer inner tubular wall i1 which is joined to the extension il at thepoint Il and extends into the tubular portion il of the Y enclosing vessel.
  • tubular wall Il and the stem Il provide an axial chamber at one end of the device for mounting the electron gun unit of this invention so that the multiple beams or streams therefrom are projected in paraxial relation toward the screen Il on the opposite end of the device.
  • FIG. 21 shownthreeparallel gununits Il, 2l and 2i.
  • Each unit comprises aplatform 22 in the center of which is mounted a cylindrical heater type cathode 23 surrounded by a cupshaped modulating or control electrode 24, as shown in Fig. 8, which is surrounded by an elongated tubular anode or focusing electrode 2l having an internal collimating element 26 spaced from the control electrode.
  • Fig. 6 'I'he anode 2i and the collimating element 2l have ways that are coaxially aligned with an aperture in the control electrode 2l by the integral convex abutment Il on the platform 22.
  • 'l'hese combined elements on the platform 22 form the electron gun unit and each unit is identical in structure.
  • 'Ihe dimensional configuraspacing and. functional operation of the electron gun unit above described is more clearly The consolidated ing-in points lset forth in U. S. Patent 2,139,878, issued December 13, 1938. to M. S. Glass.
  • 'Ihe control electrodes 24 are connected tov stub wires M and these wires are connected to separate leading-in conductors .18 and", respectively, which are also sealed in the press Il. All the conductors extend through the stem and are Joined to terminal pins Il on a base 4l cemented to the end of the tubular extension Il of the enclosing vessel.
  • a leading-in conductor Il in the press 40 is connected by a strap tovone of the straight rods and since these rods are electrically connected with the anode 2l of each gun unit, a suitablepotential may be applied thereto through this conductor.
  • the terminals 4l on the base 49 are shownin Fig.
  • the common anode terminal A is connected to the leading-in conductor 50, G1 is connected to conductor 45, H is connected to one of the heater conductors 38, G2 is connected to the conductor 46, Gf.; is connected to conductor 41, H is connected to the other. conductor 38 of the heater elements and C is connected to the common cathode conductor 43.
  • the chamber in which the gun units are located is provided with a closure member or disc 5I having three apertures 52 having the same diameter.
  • the apertures are coincident with the hollow openings of the gun units I9, 20 and 2I.
  • This closure member is secured to the chamber wall I1 by a metallic sleeve 53 which is hermetically sealed to the glass by a knife edge seal 54.
  • is placed adjacent the exit of the electron guns to serve as an accelerating electrode and increase the velocity of the electron beams passing through it.
  • This difiiculty can be avoided by inserting a metallic mass or other lengthening member 55 between the disc 5I and the ends of the electron gun units, the mass having passageways corresponding to the apertures 52 in the accelerating disc electrode 5I and the ends of the anodes of the gun units.
  • This arrangement provides uniform and identical eld relations for the three gun units so that the electron beams emanating from the guns extend in paraxial relation through the mass 55 and the accelerating electrode 5I.
  • the mass is not essential in the embodiment of the invention since the same effect may be secured by extending the tubular members of the gun units up to a position near the accelerating disc 5I, but retaining the short space relation between the gun units and the disc 5I in the same manner as shown in Fig. 6, in which the space relationship is shown between the gun units and the end of the mass 55.
  • the assembly of the gun units and the common accelerating electrode in combination with the chamber wherein the electron beams are originated provide an organization in which the rigidity of the electrode elements is assured and the protected arrangement of the gun units in the chamber insures parallel beams of high intensity and efficiency so that all phases of electrical phenomena depicted on the screen I5 will be of equal intensity so th'at the indications will have a high actinic value and accurate recording may be made of the complex figures produced thereon.
  • the multi-unit assembly may find application in a large eld such as television, electromedical investigation and in aircraft for radio beam indicators, there is also a large field of use for service equipment and laboratory measurement in which it is desirable to sweep the various beams over the whole area of the iiuorescent screen simultaneously to reproduce different phases of electrical phenomena.
  • all the electron beams are electrostatically controlled by a deflector plate unit which is rigidly mounted beyond the accelerating electrode 5I and is secured to the disc in such a manner that a compact and rigidly assembled structure is provided. Furthermore, this assembly also includes separating ⁇ shields between adjacent sets of deector plates to prevent distortion of adjacent beams, yet at the same time permitting the beams to sweep the complete area of the screen at the end of the vessel.
  • Plates 58 and 59 are provided with end extensions 60 and 6I which extend through end slots 62 and a longitudinal slot on the bottom surface of the platform 56 to rigidly position the plates with respect to the aperture 63 in the platform, the ends of the extensions being bent over as shown at 64.
  • Plates 65 and 66 are arranged adjacent the center aperture in the platform and similarly attached to the platform while the plates 61 and 68 are arranged adjacent the third aperture in the platform and have their extensions bent over the top of the platform in a direction opposite to that of plates 58 and 59.
  • the slots in the platform and the extensions on the plates insure rigid positioning of the plates and uniform parallel relation with respect to the axis passing through each aperture 63 in the platform.
  • the sweep or time-axis plates projecting above the platform are mounted in a slightly diierent manner from the lower plates to insure a rigid construction and avoid conduction between the Various sets of plates.
  • the end plates 69, 10, 1I and 12 are of similar construction, but are arranged in parallel coplanar relation above the platform 56 in transverse position with respect to the lower corresponding sets of plates.
  • These plates are provided with extensions 13 and 14 which t into end slots 15 in the platform 56 while the lower edges of the plates t in slots which are formed across'the outer boundary of the aperture 63, the ends of the extensions being bent over on the lower surface of the platform to rigidly secure the plates in position.
  • 'I'hese plates are also provided with channel extensions' 10 and 11 on the outer surfaces thereof to engage portions of a pair of locking bars 18 and 19, of insulating material, which are lprovided with undercut portions corresponding to the length of the channel extensions 16 and 11.
  • are not provided with extensions similar to the end plates 89 and 12, inclusive, since these extensions wouldl make contact with the lower center plates 05 and 88. Therefore, the center plates are supported in parallel relation by being interconnected with the end platesk by channel extensions 82 and 88, which embrace the locking bars 18 and 19.
  • are arranged in guiding slots on opposite sides of the center aperture. It is evident that these plates are thus rigidly secured to the platform 56.
  • the upper plate assemblies are further strengthened by shielding plates 84 and 85 whichare arranged between adjacent parts of upper deilector plates and are provided with extensions 80 and 81 which register with-side slots in the platform 56 and are locked in position at their lower ends by bending over the ends of the extensions on the lower surface of the platform.
  • the shielding plates are further provided with undercut portions which register with slots 88 and 89 in the locking bars to insure constant spacing between the coplanar sweep plates and also to provide a compact interlocking arrangement of the various sets of plates and shields without endangering the individual sets of plates and at the same time avoid distortion between adjacent electron beams projected through the various sets of plates.
  • This arrangement insures a rigid and compact assembly in which the various plates are maintained in their proper spacial relation with respect to each other and with respect to the electron streams passing between them. Furthermore, the'rigid assembly of the deilector plate unit from the rigid chamber structure of the tube insuresaccurate alignment of the deilector plates with respect to the ⁇ gun units mounted within the chamber.
  • Each of the defiector plates is provided with a terminal conductor in order to apply appropriate potentials to the diierent sets of plates to iniiuence the electron beams passing through the passageways formed thereby.
  • vsaid plates are designated as sets, i.- e., plates 50 and 59 being designated the lower plates of A set.
  • plates 09 and 10 are the' upper'plates of A set, the similar plates of the center set beingthe B set, while the last plates 51, 08, 1
  • Fig. 5 shows the terminals 90 in positive relation with respect to the radial conductors of the deflector plates shown in Fig. 4.
  • in Fig, 5 are provided for the twelve individual deflector plates mounted in the vessel and also for the application of a suitable potential to the accelerating electrode 5
  • This ter/minal is connected to conductor 92 which is sealed at one endthrough the wall of the vessel and connected to one of the posts 51 by a strap 83.
  • This conductor is also connected to the shield plates 84 and 85 by additional straps 94 and 95.
  • the posts 51 supporting the defiector plate unitv are also provided with curved springs 80 and 91 which engage the graphite coating I4 on the interior wall of the vessel.
  • the accelerating electrode and the conductive coating I4 may be supplied with a high positive potential to accelerate the electrons in the beams passing through the various units and at the same time a ground connection may be connected to this terminal in order that the shields 8 4 and 85 may be grounded and to avoid the effect of a large difference of potential i v nected to conductor
  • Terminal LCn is connected to conductor
  • Terminal LA1 is connected to conductor I2 which is attached to a strap
  • Terminal UBz is connected to conductor
  • Terminal UAz is connected to conductor IIS having a/strap 1 connectedl to the second upper plate 10 of the A set of plates
  • terminal UA1 is connected to conductor
  • terminal LA: is connected to conductor having *a strap
  • the device herein described may contain all the features enumerated, it is to be understood that the invention is not limited to such a specific combinationgsince under certain operating conditionscertain'features may be omitted without departing ⁇ from the scope of the invention.
  • the screen may be omitted if the invention is to be employed as a. multiple beam device.
  • the deflector plates may be omitted. Therefore, in accordance with this invention it is to be understood that the disclosure is only to be limited within the scope of the appended claims.
  • a multi-beam projection device comprising an enclosing vessel having a cylindrical reentrant' portion forming an internal chamber, a plurality 75 of beam producing units arranged in parallel relation in said chamber, a metallic electrode common to all said beam producing units in cooperative relation to said chamber and said units, sets of deector plates arranged in transverse pairs individual to each beam producing unit, and means supporting said sets of plates from said metallic electrode.
  • a multi-beam projection device comprising an enclosing vessel having a cylindrical reentrant portion forming an internal chamber, a plurality of beam producing units arranged in parallel relation in said chamber, a metallic electrode common to all said beam producing units in cooperative relation thereto, sets of plates arranged in transverse pairs individual to each beam producing unit, a support for said plates carried by said metallic electrode, and shielding means between the aligned edges of adjacent sets of said plates.
  • a multi-beam projection device comprising an enclosing vessel having a cylindrical reentrant portion forming an internal chamber, a plurality of beam producing units arranged in parallel relation in said chamber, a metallic electrode common to all of said beam producing units in cooperative relation thereto, and a tubular shielding extension superimposed on said reentrant portion and forming a support for said metallic electrode.
  • a multi-beam projection device comprising an enclosing vessel having a cylindrical reentrant portion forming an internal chamber adjacent one end of said vessel, a plurality of beam producing units arranged in parallel relation in said chamber for projecting colateral beams toward the opposite end of said vessel, a set of deilector plates adjacent each corresponding unit, and means supported by said reentrant portion and interposed between said units and defiector plates and closely spaced with respect to said units to provide uniform concentrated eld relations for the colateral beams emerging from said units.
  • a multi-beam projection device comprising an enclosing vessel having a cylindrical reentrant portion forming an internal chamber adjacent one end of said vessel, a plurality of beam producing units arranged in parallel relation within said chamber for projecting colateral beams toward the other end of said vessel, a set of deiiector plates adjacent each corresponding unit, and a common surrounding electrode mounted on an end of said chamber and separating said units from said sets of plates.
  • a multi-beam projection device comprising an enclosing Vessel, a plurality of beam producing units arranged in parallel relation at one end of said vessel lor projecting colateral beams toward the other end thereof, a set of deflector plates adjacent each corresponding unit, an electrode common to said units surrounding the upper ends thereof and separating said units from said sets of plates, and a metallic mass secured to the common electrode and having apertures in alignment with said units.
  • AV multi-beam projection device comprising a vessel having a reentrant insulating chamber portion and a projection portion, a metallic closure member attached to said chamber por tion having a plurality of apertures, and a plurality of electron gun units in said chamber corresponding to the apertures in said closure member, said units being aligned with said apertures for projecting simultaneous beams of ele@- trons through said projection portion,
  • a multi-beam projection device comprising a vessel having a reentrant insulating chamber portion and a projection portion, a metallic sleeve member sealed to said chamber portion, a metallic closure member engaging said sleeve member and having a plurality of parallel openings tiierein,. and a plurality of parallel electron gun units nsaid chamber aligned with said openings, said units projecting within the limits of said sleeve member.
  • a multi-beam projection device comprising a vessel having a reentrant insulating chamber portion and a projection portion, a metallic sleeve member carried by said lchamber portion, a metallic closure member engaging said sleeve member and having a plurality of parallel open-f ings therein, a plurality of parallel electron gun units in said chamber aligned with said openings, and sets of deflector plates corresponding to said openings adjacent thereto and supported by Ysaid chamber portion, said gun units being isolated from said sets of deector plates except through said openings in said closure member.
  • a vessel having a reentrant insulating chamber portion, a stem projecting therein, a plurality of electron gun units in said chamber arranged in parallel relation to the axis of said stem and chamber, straight spaced supporting rods extending from said stern, metallic strap members connected to said units and rods, said members compensating the difference in diameters between said units and said stem, and a metallic closure member mounted on the end of said insulating chamber portion, said closure member having openings aligned with the units in said chamber.
  • an enclosing vessel having a chamber portion, a stem therein, a plurality of coextensive electron gun units positioned beyond said stem in said chamber, a collar on said stem, rigid supports extending from said collar parallel to said Units ⁇ flanged connecting straps joined to said units and having a shelf portion extending outwardly for engagement with said supports, a metallic sleeve sealed to said chamber portion, and a disc member secured to said sleeve having passageways aligned with the units within said chamber portion.
  • a multi-cathode ray discharge device comprising a vessel having a fluorescent screen at one end, a plurality of parallel electron gun units directed toward said screen and supported in the opposite end of said vessel, a tubular member surrounding said gun units, an accelerating electrode forming a closure for said tubular member and having apertures aligned with said units, an insulating member spaced beyond said accelerating electrode and supported thereby, said insulating member having apertures corresponding to the apertures in said electrode, a plurality of sets of dei-lector plates extending below said insulating member, a like number of deflector plates j' extending above said member, said plates forming separating passageways in line with the apertures in said insulating member and accelerating electrode, and a shield plate between adjacent pairs of deflector plates.
  • a multi-cathode ray discharge device comprising a vessel having a uorescent screen at one end, a plurality of electron projection systems mounted at the other end, each system including an electron gun unit and a set of deflector plates, an enclosing chamber for the gun units, and a mounting for all the deflector plates supported by said chamber, said mounting comprising an v sets of defiector-plates in relative positions 'forv Acontrolling the direction of the separate streams' said gun units and slots adjacent said openings on opposite sides of said plate for supporting said Aof electrons projected toward said screen.
  • an elec- ⁇ trode assembly including three electron gun unit's arranged in parallel relation, and anassociate unit of deector plates for said gun umts, said associate unit comprising an vinsulating supportI having openings corresponding/tol said gun units,
  • an-elec trode assembly including three electron gun arranged in vparallel relation, and an associate;- unit of deector'plates for said gun units,"said associate unit comprising an insulating support having openings corresponding to said gun units,
  • An electronic discharge device of the multibeam type comprising an enclosing vessel having a plurality of electron gun'units, a iluorescent screen adapted' to indicate simultaneoustraces of all the electron beams projected bysaid a. metallic disc member having apertures therein corresponding to the'number of units within said vessel and'y separating said units from said screen whereby said beams can only reach said screen through said apertures, a deilector plate mounting between said disc andv said screen, said mounting including a. platform andindividual/,setsy of opposite side of said relation,y and metallic shields assembly, l 1 18.
  • -A multi-beam projection device comprising openings'individual to each y s470344.
  • y insulating plate having openings aligned-'withl detlector plates for each gununit; certain plates oi'each setbeing arranged in parallel relation said disc and said platandsupported between form, andthe remaining defiector plates being arrangedtransverse to the other plates on the platform in pafied coplanar pairs ot-coplanar defiector plates.
  • apertured electrode forming a closure for said chamber, a plurality of sets of deectorvplates mountedy on said electrode, shields between adjacent sets of said plates, and interlocking means connecting said'plates and shields into a rigid la veel havingla fluorescent coating on one end and/a reentrant chamber at the other end, a
  • a multi-beam projection device comprising "a vessel having auorescent coating on one end -land a reentrant chamber at the other end, a plurality oi' beam producing units within said chamber, ametallic electrode substantially closin g said chamber vand forming a barrier between said unitsand said screen except through openings individual 'to each unit, sets of.v deflector plates for each 'of said units mounted on said electrode, and conductors for said plates and said electrode lextending longitudinally between said chamber and-the wall of saidvessel.
  • vA multi-beam projection device comprising avessel having an internal reentrantcylindrical chamber, a stem therein, a metallic disc electrode supported on the edge of said chamber and sub.
  • a lmulti-beam projection device comprising

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US145432A 1937-05-29 1937-05-29 Multicathode ray discharge device Expired - Lifetime US2170944A (en)

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Application Number Priority Date Filing Date Title
US145432A US2170944A (en) 1937-05-29 1937-05-29 Multicathode ray discharge device
GB5172/38A GB500005A (en) 1937-05-29 1938-02-18 Multi-cathode ray discharge device
FR838528D FR838528A (fr) 1937-05-29 1938-05-28 Tubes à rayons cathodiques multiples

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US145432A US2170944A (en) 1937-05-29 1937-05-29 Multicathode ray discharge device

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GB (1) GB500005A (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459724A (en) * 1946-11-27 1949-01-18 Farnsworth Res Corp Astatic cathode-ray tube
US2522380A (en) * 1948-07-09 1950-09-12 Du Mont Allen B Lab Inc Correcting position of undeflected spot on multigun cathode-ray tubes
US2544690A (en) * 1946-12-26 1951-03-13 Du Mont Allen B Lab Inc Color television
US2660612A (en) * 1949-12-14 1953-11-24 Jr Frank M Wood Color television receiving system
US2689922A (en) * 1951-11-28 1954-09-21 Hartford Nat Bank & Trust Co Multigun cathode-ray tube
US2719242A (en) * 1954-07-08 1955-09-27 Rca Corp Beam alignment device for plural beam tubes
US2726347A (en) * 1953-04-30 1955-12-06 Rca Corp Multiple-beam electron gun
US2735031A (en) * 1951-02-15 1956-02-14 woodbridge
US2753484A (en) * 1952-07-29 1956-07-03 Itt Signal indicating device
US2829291A (en) * 1956-11-01 1958-04-01 Du Mont Allen B Lab Inc Multi-gun cathode ray tube
US2849647A (en) * 1954-03-04 1958-08-26 Philips Corp Color television reproducing device
US2866125A (en) * 1954-02-09 1958-12-23 Philips Corp Cathode-ray tube
US2887598A (en) * 1956-04-16 1959-05-19 Rca Corp Plural gun cathode ray tube
US2890378A (en) * 1954-12-23 1959-06-09 Philips Corp Method of and apparatus for positionselecting, scanning and the like
US3011090A (en) * 1952-06-24 1961-11-28 Rca Corp Plural beam tube
US3571645A (en) * 1968-04-14 1971-03-23 Sony Corp Color picture tube with mounting means for electrostatic beam convergence plates
US3575625A (en) * 1968-04-13 1971-04-20 Sony Corp Color tube with convergence electrode mounting and connecting structure
DE2412541A1 (de) * 1973-10-15 1975-04-30 Hitachi Ltd Elektronenkanonenanordnung
US3935498A (en) * 1968-05-24 1976-01-27 General Electric Company Electron gun assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921025A (en) * 1974-07-05 1975-11-18 Tektronix Inc Dual-beam CRT with vertical trace bowing correction means

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459724A (en) * 1946-11-27 1949-01-18 Farnsworth Res Corp Astatic cathode-ray tube
US2544690A (en) * 1946-12-26 1951-03-13 Du Mont Allen B Lab Inc Color television
US2522380A (en) * 1948-07-09 1950-09-12 Du Mont Allen B Lab Inc Correcting position of undeflected spot on multigun cathode-ray tubes
US2660612A (en) * 1949-12-14 1953-11-24 Jr Frank M Wood Color television receiving system
US2735031A (en) * 1951-02-15 1956-02-14 woodbridge
US2689922A (en) * 1951-11-28 1954-09-21 Hartford Nat Bank & Trust Co Multigun cathode-ray tube
US3011090A (en) * 1952-06-24 1961-11-28 Rca Corp Plural beam tube
US2753484A (en) * 1952-07-29 1956-07-03 Itt Signal indicating device
US2726347A (en) * 1953-04-30 1955-12-06 Rca Corp Multiple-beam electron gun
US2866125A (en) * 1954-02-09 1958-12-23 Philips Corp Cathode-ray tube
US2849647A (en) * 1954-03-04 1958-08-26 Philips Corp Color television reproducing device
US2719242A (en) * 1954-07-08 1955-09-27 Rca Corp Beam alignment device for plural beam tubes
US2890378A (en) * 1954-12-23 1959-06-09 Philips Corp Method of and apparatus for positionselecting, scanning and the like
US2887598A (en) * 1956-04-16 1959-05-19 Rca Corp Plural gun cathode ray tube
US2829291A (en) * 1956-11-01 1958-04-01 Du Mont Allen B Lab Inc Multi-gun cathode ray tube
US3575625A (en) * 1968-04-13 1971-04-20 Sony Corp Color tube with convergence electrode mounting and connecting structure
US3571645A (en) * 1968-04-14 1971-03-23 Sony Corp Color picture tube with mounting means for electrostatic beam convergence plates
US3935498A (en) * 1968-05-24 1976-01-27 General Electric Company Electron gun assembly
DE2412541A1 (de) * 1973-10-15 1975-04-30 Hitachi Ltd Elektronenkanonenanordnung

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FR838528A (fr) 1939-03-08
GB500005A (en) 1939-02-01

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