US3816789A - In-line type triple electron gun assembly - Google Patents

In-line type triple electron gun assembly Download PDF

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Publication number
US3816789A
US3816789A US00296598A US29659872A US3816789A US 3816789 A US3816789 A US 3816789A US 00296598 A US00296598 A US 00296598A US 29659872 A US29659872 A US 29659872A US 3816789 A US3816789 A US 3816789A
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United States
Prior art keywords
electron gun
members
gun assembly
assembly according
support members
Prior art date
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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US00296598A
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English (en)
Inventor
S Sawagata
T Tanaka
H Sato
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
    • 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

  • This invention relates to an in-line type triple electron gun assembly.
  • the prior art in-line type triple electron gun assembly is fabricated by fitting glass beads to the prescribed positions between two adjacent ones of three electron gun members arranged in the same plane by the aid of brackets fitted to grid electrodes constituting each electron gun member so as to fix together the three electron gun members.
  • the glass beads are provided separately from each other, making the relative position of the gun members unstable and in consequence giving rise to their mutual displacement.
  • the brackets fitted to the grid electrodes constituting each gun member are bent intricately and subject to a certain degree of mechanical stress during fabrication, so that application of heat required for the assembly of gun members most likely deforms the brackets. Though very slight for the individual brackets, this deformation assumes a prominent proportion for all the brackets, resulting in the noticeable displacement of the electron gun assembly as a whole. This displacement of the constituent gun members occurs particularly in their axial direction, leads to the irregular arrangement of its grid electrodes.
  • triple electron gun members each having a cathode electrode, plane grid electrode and cylindrical electrodes coaxially arranged in succession are placed side by side in the same plane with a prescribed convergence angle defined therebetween.
  • To both sides of the electron gun assembly are fused two support members to hold the respective gun members securely in place.
  • Each support member comprises at least one lateral or bridging component fused in common to at least the cathode electrodes and plane grid electrodes of the respective electron gun members and at least one longitudinal component intersecting said at least one lateral component at right angles and fitted in common to said electron gun members through the later described means which are fused to said electron gun members.
  • FIG. 1 is a side view of an in-line type triple electron gun assembly according to the first embodiment of this invention
  • FIG. 2 is a sectional view on line 2-2 of the electron gun assembly of FIG. 1;
  • FIG. 3 is a perspective view of a plane grid electrode of a side electron gun member
  • FIG. 4 is a perspective view of a plane grid electrode of a central electron gun member
  • FIG. 5 is a side view of a triple electron gun assembly according to the second embodiment of the invention.
  • FIG. 6 is a sectional view on line 66 of the triple electron gun assembly of FIG. 5.
  • each electron gun member 12 of an in-line type triple electron gun assembly 11 comprises a cathode electrode 13, a first plane grid electrode 14 and second to fourth cylindrical grid electrodes 15 to 17, all coaxially arranged in succession.
  • Said electron gun assembly 11 comprises triple electron gun members 12 each having the abovementioned arrangement, and a magnetic convergence assembly 18 disposed ahead of the furthest end of the fourth cylindrical grid electrodes of the electron gun members 12.
  • the juxtaposed triple electron gun members 12 are securely held between two generally H- shaped support members 19 made of, for example, glass.
  • the cathode electrode 13 of the electron gun member 12 comprises a heater received in a generally funnel-shaped support member 20.
  • the first plane grid electrode 14s of each side electron gun member 12 comprises, as shown in FIGS.
  • first plane grid electrode Me of the central electron gun member 12 comprises a channel-shaped effective grid electrode 24 bored with a hole 21c allowing the passage of a beam of electrons and electrode holders 25 projecting outward from both ends of said effective electrode 24.
  • the H-shaped support member 19 is so designed that when it is fused to the electron gun assembly 11, the lateral component 1% bridging the two longitudinal components 19a is so positioned as to face the first grid electrode and cathode electrode of each electron gun member 12.
  • lateral component 19b is integral with (i.e., integrally connected to) components 19a and is made of the same material as components 19a.
  • Said I-I-shaped support member 19 is fitted to the electron gun assembly 11 through the support member 20 of the cathode electrodes 13, the holders 23 and 25 of the first plane grid electrodes 14s and 140, and brackets 26 fused to the cylindrical grid electrodes 15 to 17.
  • a metal support element 19C bridges the ends of the H-shaped support member 19.
  • the three electron gun members 12 are fixed in place by the I-I-shaped support members 19, so that the respective electron gun members 12 and the electrodes included therein can be located accurately with the support members 19 used as the base. Since the electron gun members 12 are substantially free from any deformation or distortion, a beam of electrons emitted from the electron gun members 12 can display excellent characteristics of emission and focusing simply by slightly adjusting an external magnetic field. Further, the electrodes of the electron gun members 12 are independently supported by the H-shaped support members 19, so that the brackets 26 are required to hold only the grid electrodes to which they are fused, namely, are not subject to any extra load. Therefore, the brackets 26 can be made of thin light material having a relatively small mechanical strength.
  • brackets 26 can be easily fabricated; work stress occurring in the brackets 26 is reduced; when the thin brackets 26 are fused to the electrodes the roundness of said electrodes is little affected; and the electron lens constituted by the electron gun members is substantially free from aberration.
  • the lateral component 19b of the H-shaped support member 19 is fused to the first plane grid electrode and cathode electrode of each electron gun member, thereby minimizing the deformation of the mechanically weak first plane gride electrode which would occur when the triple electron gun members are assembled and the harmful effect of displacement caused by said distortion between the axis of the first grid electrode and those of the other grid electrodes. Further, the above-mentioned lateral component 19b plays the part of elevating the overall mechanical strength of the electron gun members constituting the in-line type electron gun assembly which is mechanically weaker than the delta-shaped type.
  • the triple electron gun members arranged in the same manner as in the first embodiment have the electrodes operated with the same potential or three juxtaposed electrodes.
  • the three electron gun members 12 are securely held between two insulating support members 30 each formed of lateral components 31, 32, 33 and 34 fused to the respective crosswise groups 13, 14, 15, 16 and 17, each group consisting of said three juxtaposed electrodes and a longitudinal component 35 intersecting said lateral components at right angles.
  • Lateral components 31-34 are integral with and are made of the same material as the longitudinal component 35.
  • the electron gun assembly of the second embodiment shown in FIG. 5 attains not only the same effect as the first embodiment but also displays the following advantage that since the lateral components support the crosswise groups each consisting of three juxtaposed grid electrodes operated with the same potential, the electrodes of the lengthwise groups operated with different potentials can be spaced relatively far from each other, thereby elevating the degree of insulation therebetween.
  • An in-line type triple electron gun assembly comprising:
  • three electron gun members each of which comprise a cathode electrode, plane grid electrodes and cylindrical grid electrodes, all coaxially arranged in succession, said three electron guns being located side by side in the same plane with a prescribed convergence angle defined therebetween;
  • each supporting member being fitted to said gun members and including at least one longitudinal component and at least one lateral component which are made of the same material and formed integrally in a predetermined shape, said longitudinal component extending in the lengthwise direction of said electron gun assembly and said at least one lateral component extending laterally from said longitudinal component;
  • a convergence assembly positioned ahead of the forward end of said three electron gun members.
  • each of said support members is generally H- shaped and comprises two longitudinal components and a lateral component bridging said two longitudinal components.
  • each of said support members comprises one longitudinal component and a plurality of lateral components integrally connected to said longitudinal component.

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US00296598A 1971-10-14 1972-10-11 In-line type triple electron gun assembly Expired - Lifetime US3816789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46080533A JPS4846267A (sv) 1971-10-14 1971-10-14

Publications (1)

Publication Number Publication Date
US3816789A true US3816789A (en) 1974-06-11

Family

ID=13720966

Family Applications (1)

Application Number Title Priority Date Filing Date
US00296598A Expired - Lifetime US3816789A (en) 1971-10-14 1972-10-11 In-line type triple electron gun assembly

Country Status (7)

Country Link
US (1) US3816789A (sv)
JP (1) JPS4846267A (sv)
DE (1) DE2249675A1 (sv)
FR (1) FR2156386A1 (sv)
GB (1) GB1404787A (sv)
PL (1) PL83649B1 (sv)
ZA (1) ZA727268B (sv)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973162A (en) * 1975-09-02 1976-08-03 Gte Sylvania Incorporated Cathode support means for a CRT electron generating assembly
US4096408A (en) * 1976-01-28 1978-06-20 Zenith Radio Corporation Unitized in-line electron gun having stress-absorbing electrode supports
US4400644A (en) * 1981-04-29 1983-08-23 Rca Corporation Self-indexing insulating support rods for an electron gun assembly
US5896002A (en) * 1992-03-27 1999-04-20 U.S. Philips Corporation Color display tube having an electron gun with flashover inhibiting support structure
US6902454B1 (en) * 2000-07-28 2005-06-07 Eastman Kodak Company Process for laminating electrically addressable display

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5067549A (sv) * 1973-10-15 1975-06-06
JPS5331726Y2 (sv) * 1974-02-19 1978-08-07

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119035A (en) * 1960-06-23 1964-01-21 Westinghouse Electric Corp Electron gun structure
US3258625A (en) * 1964-07-27 1966-06-28 Aligned electrode holders for mount- ing parallel array of electron guns
US3603829A (en) * 1969-05-16 1971-09-07 Tokyo Shibaura Electric Co Inline type triple electron gun assembly
US3659133A (en) * 1969-10-15 1972-04-25 Tokyo Shibaura Electric Co In-line type triple electron gun assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119035A (en) * 1960-06-23 1964-01-21 Westinghouse Electric Corp Electron gun structure
US3258625A (en) * 1964-07-27 1966-06-28 Aligned electrode holders for mount- ing parallel array of electron guns
US3603829A (en) * 1969-05-16 1971-09-07 Tokyo Shibaura Electric Co Inline type triple electron gun assembly
US3659133A (en) * 1969-10-15 1972-04-25 Tokyo Shibaura Electric Co In-line type triple electron gun assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973162A (en) * 1975-09-02 1976-08-03 Gte Sylvania Incorporated Cathode support means for a CRT electron generating assembly
US4096408A (en) * 1976-01-28 1978-06-20 Zenith Radio Corporation Unitized in-line electron gun having stress-absorbing electrode supports
US4400644A (en) * 1981-04-29 1983-08-23 Rca Corporation Self-indexing insulating support rods for an electron gun assembly
US5896002A (en) * 1992-03-27 1999-04-20 U.S. Philips Corporation Color display tube having an electron gun with flashover inhibiting support structure
US6902454B1 (en) * 2000-07-28 2005-06-07 Eastman Kodak Company Process for laminating electrically addressable display

Also Published As

Publication number Publication date
JPS4846267A (sv) 1973-07-02
GB1404787A (en) 1975-09-03
ZA727268B (en) 1973-06-27
PL83649B1 (en) 1975-12-31
FR2156386A1 (sv) 1973-05-25
DE2249675A1 (de) 1973-04-19

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