US3561083A - Method of assembling multiple element type electron guns - Google Patents

Method of assembling multiple element type electron guns Download PDF

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Publication number
US3561083A
US3561083A US861526*A US3561083DA US3561083A US 3561083 A US3561083 A US 3561083A US 3561083D A US3561083D A US 3561083DA US 3561083 A US3561083 A US 3561083A
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United States
Prior art keywords
electron gun
element type
multiple element
units
electrodes
Prior art date
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Expired - Lifetime
Application number
US861526*A
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English (en)
Inventor
Shinichi Sawagata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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Filing date
Publication date
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
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    • 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

Definitions

  • This invention relates to multiple element type electron gun assemblies yutilized in cathode ray tubes and the like, and more particularly, to a method of assembling same.
  • each electron gun unit has a first to fourth grid electrodes which are arranged coaxially on a straight line with predetermined spacing therebetween.
  • Each grid is in the form of a cylinder having a perforation at its center to permit passage of an electron beam.
  • Three unit electron guns each constructed as above described are assembled together with their centers positioned at the respective apices of an equilateral triangle, the axes of the electron guns being suitably inclined such that electron beams emitted therefrom cross each other at a predetermined point.
  • Supporting plates are secured (such as by welding) to the outer periphery of the three unit electron guns, opposite ends of each of the supporting plates being secured by fusion to insulating supporting rods made of glass.
  • the multiple element type electron gun assembly of the construction just described has the following defects.
  • the electron guns Since the interior of the equilateral triangle defined by the electron guns is vacant, the electron guns have a tendency to be inwardly under the action of external forces whereby the spacing between respective electrodes may be varied or emitted electron beams would not cross each other at the prescribed position. For these reasons when such an electron gun assembly is utilized in a cathode ray tube for television there would arise such diiculties as degrading electrical characteristics of the tube or noncoincidence of colors of the image.
  • the size of the equilateral triangle defined by the three glass rods is larger than that of the equilateral triice angle defined by the three electron gun units. Consequently, it may become difficult to insert the assembly into a cathode ray tube through its neck.
  • the various difficulties mentioned hereinabove can be substantially eliminated by assembling a multiple element type electron gun structure by holding each of a number of electron gun units by means of a pivotally supported holding member.
  • the holding members are then assembled to form a polygonal space defined by the axes of the electron gun units around a central axis. Consequently, the electron gun units are pressed against and contacted with a softened insulating supporting material which has been set at the central axis. The material is allowed to harden, thereby securing the electrodes, and is then cut as a prescribed position thereon.
  • FIG. l shows a side elevation of a structure produced according to this invention
  • FIG. 2 is a cross-Sectional view taken along a line I-I in FIG. l;
  • FIG. 3 is a side View, partly in section, of an apparatus utilized to assemble the multiple element type electron gun embodying this invention.
  • each of three electron gun units 10 comprises first to fourth grid electrodes 11, 12, 13 and 14 which are successively mounted one upon the other along a common axis with predetermined spacings therebetween, Each of these three electron gun units is provided with a perforation, not shown, at its center to pass an electron beam.
  • the three electron gun units are assembled together around a softened insulating supporting rod 16 to form an equilateral triangle defined by the axes thereof and pressed against the rod.
  • the insulating supporting rod 16 is secured by welding to the peripheries of grid electrodes 11 through 14 of said three electron gun units are secured by fusion through arcuate supporting bands 15, respectively.
  • the insulating supporting rod 16 is suitably tapered or inthe form of an elongated frustum so that electron beams emitted from the three electron gun units may cross each other at a predetermined point.
  • Electron gun units are assembled together by means of an assembling apparatus as shown in FIG. 3.
  • FIG. 3 a rod shaped upright stop 21 is mounted at substantially the center of a base plate 20.
  • holding mechanisms 22 for the electron gun units the number of the former corresponding to the number of the latter.
  • FIG. 3 shows only one holding mechanism 22 positioned at one of the apices of an equilateral triangle defined by three electron gun units as shown in FIGS. r1 and 2.
  • the holding mechanism 22 is pivotally mounted on an L-shaped support 40 which is secured to the base 20 by means of bolts 41.
  • a substantially C-shaped holding member 23 or frame for the electron gun unit is rotatably mounted on a pivot shaft 42 to be operable by a lever 43.
  • a vertical central rod 44 is supported by a bottom yoke 25 of the clamping member 23, said central rod receiving successive grid electrodes 11, 12, 13 and 14 with suitable spacers 27 interposed between adjacent electrodes.
  • the back of substantially C-shaped supporting members 15 are embedded and fixed in the side walls of these first to fourth grid electrodes 11, 12, 13 and 14, respectively.
  • a screw 26 threaded through the upper yoke 24 of the holding member 23 is urged against the upper end of the central rod 44 to clamp and support the electron gun unit 10.
  • a heating device 28 is positioned above the upright stop 21 coaxially therewith.
  • the heating device 28 comprises a hollow annular body 29 and a heat insulating cylindrical housing 30l which surrounds the annular body 29.
  • An insulating supporting rod made of glass is inserted in said hollow annular body 29 to be heated by a burner 31 provided on the inner wall of the annular body 29.
  • a mixture of gaseous fuel and air is supplied to the interior of the annular body 29 from a source, not shown, via a pipe 32.
  • the insulating supporting rod -16 made of glass inserted in the annular body 29 is fed by a feed mechanism 33 located above the housing 30 until it engages the upper end of the stop 21 after being heated and softened by the heating device 218. Then the holding member 23 for the electron gun unit is tilted from a position indicated by dotted lines to a position indicated by solid lines by pushing upwardly the lever 43.
  • gas burner 31 is used as the heating means it will be understood that a high frequency heating device may also be used. Further, to provide oxidation-free electron gun assemblies, they may be positioned in vacuum or nitrogen atmosphere.
  • the above described embodiment relates to a three electron gun assembly for use in color cathode ray tubes.
  • Two electron gun assemblies for use in observation cathode ray tubes can also be manufactured by the same process.
  • a pair of holding members for electron gun units are disposed to oppose each other and a heated and softened insulating supporting rod of glass is fed between opposed holding members and the holding members are assembled to fuse the electron gun units to the softened rod.
  • the electron gun assemblies constructed in accordance with this invention are of small size so that they can be readily inserted in relatively narrow necks of cathode ray tubes.
  • a method of assembling a multiple element type electron gun structure comprising the steps of:
  • each of a plurality of electron beam emitting electron gun units each of which includes a plurality of spaced coaxial grid electrodes, by means of a respective pivotally supported holding member;
  • each of the holding members pivoting each of the holding members to locate said electron gun units about a central axis to form a polygonal space defined by said electron gun units around said central axis;
  • a method according to claim 2 wherein a heating means is located above said holding members and wherein said inserting step includes feeding said insulating supporting rod into said polygonal space through said heating means for softening said rod.
  • a method according to claim 2 including the steps of connecting a supporting member to each of said electrodes, said insulating supporting rod thereby being further secured to said electrodes.
  • a method of assembling a multiple element type electron gun structure comprising the steps of:
  • each of a plurality of electron beam emitting electron gun units each of which includes a plurality of spaced coaxial grid electrodes, by means of a respective pivotally supported holding members;
  • each of the holding members pivoting each of the holding members to locate said electron gun units about said central axis to form a polygonal space defined by said electron gun units around said central axis;
  • said insulating supporting material is an insulating rod.
  • a method according to claim 8 wherein a heating means is located above said holding members and wherein said inserting step includes feeding said insulating supporting rod into said polygonal space through said heating means for softening said rod.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US861526*A 1966-08-31 1969-07-24 Method of assembling multiple element type electron guns Expired - Lifetime US3561083A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5699166 1966-08-31

Publications (1)

Publication Number Publication Date
US3561083A true US3561083A (en) 1971-02-09

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ID=13042944

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Application Number Title Priority Date Filing Date
US861526*A Expired - Lifetime US3561083A (en) 1966-08-31 1969-07-24 Method of assembling multiple element type electron guns

Country Status (3)

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US (1) US3561083A (de)
GB (1) GB1204192A (de)
NL (1) NL6711954A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4341545A (en) * 1981-04-29 1982-07-27 Rca Corporation Beading apparatus for making an electron gun assembly having self-indexing insulating support rods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4341545A (en) * 1981-04-29 1982-07-27 Rca Corporation Beading apparatus for making an electron gun assembly having self-indexing insulating support rods

Also Published As

Publication number Publication date
GB1204192A (en) 1970-09-03
NL6711954A (de) 1968-03-01
DE1614859B2 (de) 1972-08-17
DE1614859A1 (de) 1970-12-23

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