US3848301A - Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube - Google Patents

Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube Download PDF

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Publication number
US3848301A
US3848301A US00304012A US30401272A US3848301A US 3848301 A US3848301 A US 3848301A US 00304012 A US00304012 A US 00304012A US 30401272 A US30401272 A US 30401272A US 3848301 A US3848301 A US 3848301A
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Prior art keywords
cathode
grid
distance
assembly
support
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Expired - Lifetime
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US00304012A
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English (en)
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L Gruber
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RCA Licensing Corp
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RCA Corp
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Publication date
Priority to US00304012A priority Critical patent/US3848301A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority to NLAANVRAGE7315142,A priority patent/NL179429C/xx
Priority to GB5132273A priority patent/GB1453293A/en
Priority to IT70223/73A priority patent/IT996904B/it
Priority to DE2355240A priority patent/DE2355240C3/de
Priority to CA185,070A priority patent/CA999639A/en
Priority to FR7339324A priority patent/FR2205738B1/fr
Priority to JP12487873A priority patent/JPS5331593B2/ja
Application granted granted Critical
Publication of US3848301A publication Critical patent/US3848301A/en
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/18—Assembling together the component parts of electrode systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/18—Assembling together the component parts of the discharge tube
    • H01J2209/185—Machines therefor, e.g. electron gun assembling devices

Definitions

  • ABSTRACT S n 29/2516, gkgg ggig Method includes fixing a grid in its final spaced posi- 58] Fieid 15 25 16 tion from a cathode in the cathode support of an elecd tron gun.
  • a cathode having an emissive surface is first axially positioned outside the cathode support with the emissive surface spaced a reference distance X from [56] g gizf g q the confronting surface of the grid.
  • the cathode and A grid are then moved with respect to each other the 2,864,935 l2/l958 Johnson 61 al 29/25.l9 reference distance X less the pacing distance
  • the i'ili'ifi $323 32385;;'1':1""'"'"':'”" 5315212 is fixed 3,533,l47 10/1970 Baur et al.
  • the surface of the electron-emissive coating on a cathode is axially positioned a spacing distance S from a control grid G1.
  • the cathode and grid are fixed to, and electrically insulated from, one another by glass support rods.
  • the electron gun also includes a cathode support and at least one additional screen grid or G2 grid, which is spaced from the control grid or G1 grid.
  • G2 grid is spaced from the control grid or G1 grid.
  • the G1 and G2 grids are fixed in known spaced position with respect to each other. Then, a probe is inserted through the apertures in the G2 grid and the G1 grid in a direction of the desired future position of the cathode until a shoulder on the probe bears against the G2 grid. Since the aperture sizes of the G1 and G2 grids are the same diameter, the probe references against the G2 grid, and not the G1 grid.
  • the probe may be used with a capacitance-bridgemeasurement system or with an air-gaugemeasurement system, as is known.
  • the probe and the Gl-G2 grid assembly are advanced until the measurement between the cathode and the G2 grid is within a desired range, indicating that the cathode and the G1 grid are also a desired spacing distance S apart. Then, the cathode is fixed in position using this measurement and the known distance between the G1 and the G2 grids.' In this prior mounting method, at least the variation in the thickness of the G1 grid, the variation in the thickness of the G2 grid, and the variation of the G1 and G2 grid spacing, result in errors in setting the cathode G1 grid spacing distance S.
  • a cathode is positioned within the cathode support in an approximate spaced position from the G1 grid. Then, a light is projected into the space formed between the cathode and the G1 grid. The resulting image of the space is optically magnified on a screen positioned outside the electron gun. The space is then adjusted while monitoring the optically-magnified image until the desired spacing distance S is obtained.
  • This method requires that there are no obstructions within or around the electron-gun spacevln one practice it is necessary toform a depression inthe protuberance which usually surrounds the aperture in-the grid to provide clearance for projecting a direct image of the space.
  • This method is not suitable where a depression cannot be formedin the grid protuberance such as where the protuberance is necessary to eliminate side emission from the cathode, or the config uration of the electron gun structure does not permit obtaining a projected image of the identical space.
  • a cathode having an emissive surface is mounted on a cathode support in axial alignment with the emissive surface precisely a spacing distance S from the confronting surface of an apertured grid.
  • a grid is fixed in its final position from a cathode support, and a cathode is first positioned outside the cathode support with the emissive surface spaced a known distance X from the confronting surface of the grid.
  • the cathode and the grid are then moved with respect to each other'the distance X less the spacing distance S to position the cathode within the cathode support with the precise spacing distance S between the emissive surface of the cathode and the confronting surface of the grid.
  • the cathode is then fixed in the support.
  • the novel method permits an accurate establishment of the spacing distance S directly with respect to the cathode and G1 grid (not indirectly with respect to the cathode and G2 grid). This eliminates the accumulation of measurement errors which may a y the actual spacing distance from that of the desired precise spacing distance S.
  • the novel method also may be used with a G1 grid having a protuberance which surrounds the G1 grid aperture and whichjextends in the direction of the cathode since the spacing distance S is determined independently of the configuration of at least the G1 grid.
  • the novel method provides an accurate cathode-G1 grid spacing distance S, which eliminates cathode-G1 grid arcing and provides a more precise setting of the G2 cutoff voltage value.
  • FIG. I is an axial sectional view of a mount illustrating the spacing distance S established by the novel method.
  • FIG. 2 is a side elevational view of a span-set apparatus used in the novel method.
  • FIG. 3 is a top elevational view of the apparatus of FIG. 2.
  • FIG.'4 is a sectional view on section 4-4 of the apparatus of FIG. 3.
  • FIG. 5 is an enlarged partial view of the apparatus shown in FIGS. 2 through 4 illustrating the step of positioning a cathode outside a cathode support with the emissive surface spaced a reference distance X from the confronting surface of a 01 grid.
  • FIG. 1 illustrates a partial mount assembly, hereafter called mount 20, for an inline electron-gun assembly 21 prior to assembly with a cage (not shown) and a stem (not shown).
  • the inline electron-gunassembly 21 commounted on a center pivot 63 directly behind the cross prises three electron guns 22a, 22b and 22c, which are in a line.
  • the three electron guns include a common control grid or G1 grid 23, a common screen grid or G2 grid 24, a common first accelerating and focusing grid or G3 grid 25, a common second accelerating and focusing grid or G4 grid 26, and a common shield cap (notshown), all fixedly spaced along two glass support rods 27a and 27b.
  • the G1 grid 23 and the G2 grid 24 are two closely spaced plates each having three small aligned apertures 28a, 28b and 28c and 29a, 29b and 290 respectively.
  • the G4 grid 26 also includes a grid flange 30. 2
  • Each electron gun also includes a separate cathode 31 attached to a cathode-support sleeve 32.
  • the cathode-support sleeve 32 is also fixed to the two glass rods 27a and 27b.
  • Each cathode 31 is closed at the forward end 33 by a cap 34 having an end coating 35 of electron-emissive material.
  • the outside or emissive surface 36 of the electron-emitting coating 35 on the cathode 31 is spaced a precise spacing distance S from the confronting surface 37 of the G1 grid 23 adjacent the apertures, as will be described by the novel method.
  • FIGS. 2, 3, and 4 illustrate apparatus known in the art as a span-set unit 38.
  • the span-set unit 38 comprises a first carriage assembly 39 for holding the mount, a second carriage assembly 40 for holding the cathode, a measurement-probe assembly 41 and a welding assembly 42, all being positioned on a frame 43.
  • the spanset unit 38 is designed to separately support a mount and a cathode on a central machine axis 44, which coincides the axes of the mount and the cathode for assembly by the novel method. Since each mount includes three electron guns 22a, 22b and 22c, the span-set unit 38 is adapted to index the axis of each electron gun into alignment with the machine axis 44.
  • the first carriage assembly 39 includes slide rods 45,
  • a tandem air-cylinder unit 50 is connected between the frame 43 and the rear carriage 48.
  • the tandem air-cylinder unit 50 includes a first air cylinder 51 and a second air cylinder 52.
  • - front and rear carriages 47 and 48 respectively are conadjustable stop 54 is attached to the frame 43 to limit the forward movement of the front carriage 47.
  • a mount-holding fixture 55 is attached to the front carriage 47 on a cross slide 56.
  • the mount-loading fixture 55 includes mandrel pins 57 and a flange-receiving surface 58.
  • An indexing means 59 is mounted on the front carriage 47 behind the cross slide 56 to index the mount-holding fixture 55 and mount 20 positioned therein. Each index position aligns one electron-gun axis on the machine axis 44, as previously described.
  • the indexing means 59 shown in FIG. 3, includes a cam 60, a first operating member 61 and a second operating member 62.
  • the cam is rotationally slide 56, as shown in FIG.
  • the cam 60 includes three radial surfaces 64a, 64b and 64c equiangularly spaced thereon, each surface corresponding to one of the three index positions of the cross slide 56.
  • the cam 60 is -maintained in contact with the cross slide 56 with a spring 65 connected therebetween.
  • the second carriage assembly 40 includes a cathodesupport carriage 66 and a cathode-holding fixture 67.
  • the cathode-holding fixture 67 includes a mandrel portion 68 for supporting the cathode in a fixed position.
  • the cathode-support carriage 66 is moved in a direction alongthe axis 44 by a servo drive motor 69 and drive means 70. i
  • the measurement-probe assembly 41 includes probe-support members 71 slidably positioned within vertical guide bearings 72 that are attached to the frame 43.
  • a probe-head assembly 73 is positioned on top of the probe-support members 71.
  • the probesupport members 71 are raised by lift means 74 engaging the probe-support members 71, as shown in FIG. 4.
  • the lift means 74 includes a lift lever 75 attached to a pivot shaft 76 at one end and engaging the probesupport members 71 at the other end.
  • An operating lever 77 is also connected to the pivot shaft 76 at one end and at the other end to the piston rod 78 of a lift cylinder 79, which is pivotally mounted to the frame 43.
  • a second adjustable stop 80 is attached to the frame 43 to permit raising the probe-head assembly 73 until it is in the desired vertical position horizontally aligned with the machine axis 44.
  • the probe-head assembly 73 includes a first gauge 81 and a second gauge 82.
  • the first gauge 81 extends from the probe-head assembly 73 along the machine axis 44 in the direction of the mount 20, and the second gauge 82 extends from the probe-head assembly 73 along the machine axis 44 in the direction of the emitting surface 36 on the cathode 31, as shown in FIG. 5.
  • the first gauge 81 is an air gauge such as catalog No. 882S4, marketed by Moore Products Co., Springhouse, Pa. Referring to FIG. 5, the first gauge 81 includes a nozzle 83, whichextends from the probe-head assembly 73 towards the G1 grid 23.
  • the air gauge 81 is part of an air-measurement unit. Movement of the nozzle 83 with respect to the surface 37 of the G1 grid 23 changes the back pressure within the first gauge 81 and consequentially provides a measurement on an air-gauge meter 84 related to the spacing distance between the end of the nozzle 83 and the confronting surface 37 of the G1 grid 23.
  • the second gauge 82 is an insulated rod 85, which extends from the probe-head assembly 73 towards the cathode 31.
  • the insulated rod 85 is part of a capacitance-measurement unit 86.
  • the capacitancemeasurement unit 86 comprises a capacitancemeasurement bridge circuit and a null meter 87, as is tance X is established.
  • the welding assembly 42 includes four welding-gun air cylinders 88a through 88d and four welding guns 89a through 89d radially extending towards the attachment position of the cathode 31 and cathode support sleeve 32.
  • FIG. 5 illustrates the mount-holding fixture 55.
  • the cathode 31 is positioned on the cathode-holding fixture 67 and supported axially with respect to the internal diameters on a mandrel portion 68.
  • the base of the open end of the cathode 31 is held against a shoulder on the mandrel portion 68 of the cathode holding fixture 67.
  • the span-set unit 38 is then operated by actuating manual start switches (not shown) to raise the measurement-probe assembly, 41 against the second adjustable stop 80. At this position, the axes of the first and second gauges 81 and 82 respectively are coincident with the machine axis 44. With the measurement-probe assembly 41 in the raised position, a first switch 90 is activated, and a second switch 91 is inactivated.
  • Activating the first switch 90 operates the first air cylinder 51 of the tandem air-cylinder unit 50 to move the mount 20 to a position where the surface 31 of the G1 grid 23 is adjacent to the first gauge 81.
  • the first air cylinder 51 of the tandem air-cylinder unit 50 moves both thefront carriage 47 and rear carriage 48 about 541 inch until the piston of air cylinder 51 reaches the end of its stroke.
  • the operator then manually rotates the Vernier-adjustment means 53 to move the front carriage 47 with respect to the rear carriage 48 until a zero meter reading is obtained for the first gauge 81. With the first gauge 81 at zero, a distance Y is established between the center reference 92 of the measurementprobe assembly 41 and the surface 37 of the G1 grid 23.
  • the movement of the carriages 47 and 48 also initiates a fourth switch 95.
  • the fourth switch 95 operates the servo motor 69, which moves the cathode 31 towards the second gauge 82.
  • the null meter. 87 for the capacitance-measurement unit 86 is at zero.
  • the distance Z between the center reference 92 of the measurement-probeassembly 41 and the electron-emissive surface 36 of the cathode 31 is established with the second gauge 82 at null.
  • the sum of the distances Y and Z is equal to a defined distance X.
  • the defined distance X is accurate to within a total tolerance of 0.0002 inch.
  • the operator then actuates two cycle switches 94 which activate the assembly cycle.
  • the first air cylinder 51 of the tandem air cylinder unit 50 operates to retract the front and rear carriages 47 and 48 to move the mount 20 away from the first gauge 81 on the probe-head assembly 73. Retracting the carriages 47 and 48 activates the third switch 93, which lowers the measurement-probe assembly 41.
  • the second switch 91 is activated to operate both the first and second air cylinders 51 and 52 of the tandem air cylinder unit 50.
  • the operation of the first air cylinder 51 of the tandem air-cylinder unit 50 returns the first carriage assembly 39 to the unretracted position (right position in FIGS. 2 and 3), and the operation of the second air cylinder 52 of the tandem aircylinder unit 50 moves the first carriage 39 a distance X less the desired spacing distance S against a preset stop 54.
  • the cathode -31 is within the cathode-support sleeve 32 with the emissive surface 36 a precise spacing distance S from the face of the G1 grid 23.
  • the distance'X is 4.0000 i 0.000l inch
  • the spacing distance S is 0.0050 1 0.0001 inch.
  • One of the three cathodes 31 is now precisely welded into position in the mount 20, and both the first and second air cylinders 51 and 52 respectively retract the carriages 47 and 48 to their initial position.
  • the index-- ing of the cross slide 57 occurs in two steps. During forward movement of the front carriage 47, the first operating member 61 strikes a cam follower on the cam 60 to rotate the cam 60. Sincethe cam 60 is formed with a dwell for this 60, no indexing occurs. Then, on rearward movement of the front carriage 57, the second operating member 62 strikes a cam follower on the cam 60 to rotate the cam a second 60.
  • the cross slide is now indexed to present the second radial surface 64b to the cross slide 56, and consequently to position the axis of the second electron gun 22b aligned with the machine axis 44.
  • a second cathode 31 is then loaded, and the cycle repeated to fixedly attach the second cathode 31 in the second electron gun also at the precise spacing distance S.
  • the insertion of the third cathode in;,the third electron gun 22c is also accomplished in the same manner as described for the first and second cathodes.
  • the mount 20 is unloaded for further processing, as is known.
  • the span set unit is reset for processing a subsequent mount.
  • the first reference distance and the second reference distance are established with airand capacitance-type gauges, they may also be established with other type gauges, such as by a manually-held micrometer or a gauge block.
  • the only criterion is that the measurement means must be accurate within 0.0002 inch and must not damage the measured parts.
  • the micrometer or gauge block may contact the emissive surface, but the entire surface of the emissive coating must be contacted and a low surface pressure must be used to prevent damage to the coating.
  • the distances Y and Z also may be measured directly as one measurement distance X. This also may be accomplished with a manually-held micrometer.
  • the novel method is not limited to a particular type of cathode and may be used to space any cathode a precise spacing distance from a grid.
  • a cathode having a coating of an emissive material thereon is described, a cathode such as a dispenser cathode where the emissive material is within a porous metal may also be spaced by the novel method.
  • the novel method is also not limited to a particular type electron gun but may be used for a single electrongun assembly, a delta electron-gun assembly or the inline electron-gun assembly described.
  • cathode-ray tube cathodegrid assembly in which a cathode having an emissive surface ismounted on a cathode support in axial alignment therewith and in which the emissive surface is precisely spaced a distance S from the confronting surface pf an apertured grid, the method of assembling said cathode-grid assembly comprising the steps of,
  • cathode-ray tube cathodegrid assembly in which a cathode having an emissive surface is mounted on a cathode support in axial alignment therewith and in which the emissive surface is precisely spaced a distance S from the confronting surface of an apertured grid, the method of assembling said cathode-grid assembly comprising the steps of,
  • cathode-ray tube cathodegrid assembly in which a cathodehaving an emissive surface is mounted on a cathode support in axial alignment therewith and in which the emissive surface is precisely spaced a distance S from the confronting surface of an apertured grid, the method of assembling said cathode-grid assembly comprising the steps of,
  • said probe means includes a capacitance gauge for determining the distance 2.
  • said probe means includes an air gauge for determining the distance Y.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US00304012A 1972-11-06 1972-11-06 Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube Expired - Lifetime US3848301A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00304012A US3848301A (en) 1972-11-06 1972-11-06 Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube
GB5132273A GB1453293A (en) 1972-11-06 1973-11-05 Cathode structures
IT70223/73A IT996904B (it) 1972-11-06 1973-11-05 Procedimento per il posizionamen to preciso del complesso catodo griglia in un tubo a raggi catodi ci
DE2355240A DE2355240C3 (de) 1972-11-06 1973-11-05 Verfahren zum Anordnen einer Kathode und einer Gitterelektrode in genauem Abstand zueinander
NLAANVRAGE7315142,A NL179429C (nl) 1972-11-06 1973-11-05 Werkwijze dienende om het emitterend oppervlak van een aan een drager bevestigde kathode op een nauwkeurige voorgeschreven afstand ten opzichte van een zich daar tegenover bevindend vlak van een roosterelektrode te monteren.
CA185,070A CA999639A (en) 1972-11-06 1973-11-06 Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube
FR7339324A FR2205738B1 (zh) 1972-11-06 1973-11-06
JP12487873A JPS5331593B2 (zh) 1972-11-06 1973-11-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00304012A US3848301A (en) 1972-11-06 1972-11-06 Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube

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US3848301A true US3848301A (en) 1974-11-19

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US00304012A Expired - Lifetime US3848301A (en) 1972-11-06 1972-11-06 Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube

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US (1) US3848301A (zh)
JP (1) JPS5331593B2 (zh)
CA (1) CA999639A (zh)
DE (1) DE2355240C3 (zh)
FR (1) FR2205738B1 (zh)
GB (1) GB1453293A (zh)
IT (1) IT996904B (zh)
NL (1) NL179429C (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170811A (en) * 1978-09-05 1979-10-16 Rca Corporation Method for coating cathode material on cathode substrate
US4176432A (en) * 1978-12-13 1979-12-04 Rca Corporation Method for establishing uniform cathode-to-grid spacing in an electron gun
US4846748A (en) * 1987-06-05 1989-07-11 Videocolor Cathode-inserting machine for cathode-ray tube
US4850920A (en) * 1987-03-20 1989-07-25 Videocolor Machine for inserting cathodes in cathode tube guns
US4898559A (en) * 1988-01-13 1990-02-06 Videocolor Machines for the implantation of cathodes in cathode-ray tube guns
US5295887A (en) * 1993-06-16 1994-03-22 Zenith Electronics Corporation K-G1 electrode spacing system for a CRT electron gun

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143555U (zh) * 1974-09-27 1976-03-31
DE3035970C2 (de) * 1980-09-24 1982-11-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur Justierung der Elektrodenabstände in Strahlenerzeugungssystemen von Elektronenstrahlröhren
JPH03133023A (ja) * 1989-10-16 1991-06-06 Hokuto Denshi Kogyo Kk 電子銃の組立方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864935A (en) * 1957-07-01 1958-12-16 Sylvania Electric Prod Apparatus for spacing and uniting parts
US2872609A (en) * 1957-06-14 1959-02-03 Sylvania Electric Prod Cathode-grid spacing means
SU147602A1 (ru) * 1960-02-03 1961-11-30 Ю.И. Гребень Способ сборки катодно-модул торного узла электронно-лучевой трубки
US3114199A (en) * 1962-03-16 1963-12-17 Raytheon Co Assembly apparatus
US3533147A (en) * 1968-07-19 1970-10-13 Zenith Radio Corp Cathode inserting machine and process
US3643299A (en) * 1969-06-16 1972-02-22 Rca Corp Electron beam tube and method of adjusting the electrode spacing of an electron gun therein
US3667824A (en) * 1970-08-10 1972-06-06 Tokyo Shibaura Electric Co Method for adjusting the space between cathode and first plate grid electrodes in an electron gun member

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872609A (en) * 1957-06-14 1959-02-03 Sylvania Electric Prod Cathode-grid spacing means
US2864935A (en) * 1957-07-01 1958-12-16 Sylvania Electric Prod Apparatus for spacing and uniting parts
SU147602A1 (ru) * 1960-02-03 1961-11-30 Ю.И. Гребень Способ сборки катодно-модул торного узла электронно-лучевой трубки
US3114199A (en) * 1962-03-16 1963-12-17 Raytheon Co Assembly apparatus
US3533147A (en) * 1968-07-19 1970-10-13 Zenith Radio Corp Cathode inserting machine and process
US3643299A (en) * 1969-06-16 1972-02-22 Rca Corp Electron beam tube and method of adjusting the electrode spacing of an electron gun therein
US3667824A (en) * 1970-08-10 1972-06-06 Tokyo Shibaura Electric Co Method for adjusting the space between cathode and first plate grid electrodes in an electron gun member

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170811A (en) * 1978-09-05 1979-10-16 Rca Corporation Method for coating cathode material on cathode substrate
US4176432A (en) * 1978-12-13 1979-12-04 Rca Corporation Method for establishing uniform cathode-to-grid spacing in an electron gun
US4850920A (en) * 1987-03-20 1989-07-25 Videocolor Machine for inserting cathodes in cathode tube guns
US4846748A (en) * 1987-06-05 1989-07-11 Videocolor Cathode-inserting machine for cathode-ray tube
US4898559A (en) * 1988-01-13 1990-02-06 Videocolor Machines for the implantation of cathodes in cathode-ray tube guns
US5295887A (en) * 1993-06-16 1994-03-22 Zenith Electronics Corporation K-G1 electrode spacing system for a CRT electron gun

Also Published As

Publication number Publication date
JPS4979666A (zh) 1974-08-01
GB1453293A (en) 1976-10-20
FR2205738B1 (zh) 1977-05-27
DE2355240A1 (de) 1974-05-16
JPS5331593B2 (zh) 1978-09-04
FR2205738A1 (zh) 1974-05-31
NL179429B (nl) 1986-04-01
DE2355240B2 (de) 1977-07-14
IT996904B (it) 1975-12-10
NL7315142A (zh) 1974-05-08
NL179429C (nl) 1986-09-01
DE2355240C3 (de) 1978-03-09
CA999639A (en) 1976-11-09

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