US3769547A - Cathode heater support - Google Patents

Cathode heater support Download PDF

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Publication number
US3769547A
US3769547A US00256979A US3769547DA US3769547A US 3769547 A US3769547 A US 3769547A US 00256979 A US00256979 A US 00256979A US 3769547D A US3769547D A US 3769547DA US 3769547 A US3769547 A US 3769547A
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US
United States
Prior art keywords
ribbon
loop
apex
vitreous
portions
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
Application number
US00256979A
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English (en)
Inventor
G Werst
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.)
Lockheed Martin Tactical Systems Inc
Maxar Space LLC
Original Assignee
Philco Ford Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philco Ford Corp filed Critical Philco Ford Corp
Application granted granted Critical
Publication of US3769547A publication Critical patent/US3769547A/en
Anticipated expiration legal-status Critical
Assigned to LORAL AEROSPACE CORP. A CORPORATION OF DE reassignment LORAL AEROSPACE CORP. A CORPORATION OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FORD AEROSPACE CORPORATION, A DE CORPORATION
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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/04—Cathodes

Definitions

  • ABSTRACT A heater support 100p for use in the multicathode gun of a cathode ray tube.
  • the loop is made from a single piece of conductive material, which is ribbon-like in cross section and preformed into a generally triangular shape with pointed terminations, or apex portions, glassed" into vitreous assembly rods.
  • Three gaps are provided in the ribbon,- intermediate the apexes of the loop, and the free ends adjoining the gaps are positioned to accept the connections of the filamentary heaters.
  • Two of the apex portions of the loop are formed of short, straight runs of ribbon which form the point and interlock with the vitreous rod to prevent twisting of the ribbon material in the rod.
  • the third apex is formed by free ends of the conductive ribbon disposed in closely spaced adjacency and each free end includes a portion bent outwardly and rearwardly from the adjoining end to provide for interlocking engagement with the embedding vitreous rod and extending into position to serve as a supply conductor for the loop.
  • This invention relates to electron guns, and is especially concerned with improvements in the filamentary heater support structure used in electron guns of color cathode ray tubes.
  • it has been customary to form the heater support loop of a plurality of pieces of wire or strap material. Adjacent spaced end portions of each said piece are glassed into adjoining assembly rods, while opposite adjacent end portions are welded to the heater connections.
  • Such constructions have proven to be disadvantageous in that they involve a large number of individual welds, each of which increases the problems of assembly and is a potential source of arcing.
  • My apparatus is also featured by inclusion of free ribbon ends bent to form flying leads, where such leads emerge from the glass bead.
  • I provide a cathode heater loop formed of a narrow ribbon of conductive material and having three apex portions disposed in generally triangular array when the loop is viewed in plan, all in general accordance with the mentioned prior disclosure.
  • the apex portions are formed of short straight runs of ribbon which define points, when viewed in plan, and which points are embedded within the vitreous rod.
  • This particular configuration is used at two of the apexes, the third being formed by free ends of the conductive ribbon disposed in closely spaced adjacency and bent outwardly and rearwardly from the adjoining end. This bending provides a termination which is generally pointed and which, taken in conjunction with the ribbon-like nature of the conductive material, positively prevents twisting or sliding of the conductor in the vitreous rod.
  • a heater support loop contemplated by this invention reduces the cost of the cathode ray tube gun by simplifying the fabricating processes, eliminating many welds and providing the highest possible stability for the conductor at the points of securement thereof with the glass beads.
  • FIG. 1 is a side elevational view, on a substantially enlarged scale, with vitreous rods in section, showing the support loop after glassing thereof, and illustrating the manner in which the pointed apexes become embedded in the vitreous material of the supporting rod;
  • FIG. 2 is a fragmentary elevational view on a similar scale showing the apparatus of this invention including the supported filamentary heaters and illustrating the structure in the position it occupies in the neck of a cathode ray tube.
  • FIG. 2 there is shown a cathode heater support loop 10 comprised of ribbonlike material and shown as mounted in the neck 11 of a color cathode ray tube 12.
  • the neck is broken-away in the interest of clarity, and illustration of the apparatus is limited to the three vitreous insulating rods shown in section at l3, l4 and 15, and to the cathode heater loop 10 which is associated with and supported by said rods.
  • a complete gun structurc would also comprise a battery of three electron guns, including grids and other elements, all of which would be supported by the vitreous rods.
  • the various tube elements, including the cathode sleeves 16, 17 and 18 would all have suitable connection to the terminal pins 19 which extend externally of the tube.
  • the cathode heaters are preferably of the known type which comprise twisted ceramic coated wire, see for example the wire 16a nested within the narrow, tubular sleeve or shell 16. Each heater has a pair of downwardly extending leads which are connected, as by welding, to the cathode heater loop 10. Two such leads are identified at 20 and 21, being connections for the heater contained within the enclosure 17.
  • the loop 10 is generally triangular when viewed in plan and includes two comers or apex portions 22 and 23 and a third apex portion comprising free ends 24 and 25.
  • FIG. 1 In the fabrication of a cathode heater structure of this kind a continuous loop is first provided as shown in FIG. 1, and the reversely bent apexes, as well as the third apex portion, are glassed into the supporting rods.
  • the ribbon material at central portions intermediate its apexes, is then severed for example along the lines of severance shown in FIG. 1 at 26, 27, and 28, in general accordance with the teaching of the copending disclosure.
  • the ribbon material is then configured, in the region of the severed portions, to provide gaps by separating the adjacent severed ends thereof, see for example the gap between severed ends 29 and 30 (FIG. 2), to provide support locations for connection of the filamentary heaters.
  • the heaters are then connected in series circuit through the agency of the loop or ribbon 10, by welding the two leads of each such heater, e.g., leads 20 and 21, to a corresponding pair of spaced severed ends.
  • corner portions which form apexes 22 and 23 comprise wire ribbon so bent reversely upon itself as to provide two short straight runs of ribbon leading to a point. See for example the runs 22a and 2212 which appear in FIG. 1. During glassing of the loop, these runs become interlocked with the vitreous material, as is clear from the drawing. There is virtually no possibility of an apex portion so configured, twisting or slipping with respect to the surrounding glass. Thus the ribbon is rigidly fixed as against both arcuate and vertical movement in the embedding material.
  • the third apex portion that is the portion formed by the free ends 24 and 25, also presents this advantageous rigidity of construction.
  • the ribbon is bent outwardly and rearwardly, as shown at 25a and 24a (FIG. 1) to provide straight runs which become embedded in the glass. These short straight runs are provided with extensions which lead back toward the center of the loop and terminate in the laterally extending wings 31 and 32. These wings constitute integral flying leads through the agency of which the loop and its filamentary heaters may be connected in the desired series circuit.
  • the ribbon was of stainless steel 0.010 inch by 0.030 inch in cross section.
  • the distance from the geometrical center of the loop to the apex portions was 0.375 inch while the spread between the spaced conductor portions, for example between the free ends 24 and 25, was about 0.10 inch.
  • the short straight runs of ribbon should have a length suitable to permit the entire apex portion to be embedded in the vitreous rod, as illustrated.
  • the bead folds over and completely envelops the apex including the short straight runs of wire, for example the runs 22a and 22b and the runs 24a and 25a.
  • the ribbon is securely locked within the rod and a rigid heater loop is achieved with a minimum number of welds.
  • the only welds required are those which secure the individual heater leads, for example the leads 20 and 21, to the loop.
  • a cathode heater loop comprising: a narrow strip or ribbon of.conductive material having three apex portions disposed in generally triangular array when the loop is viewed in plan, and having gaps in each of three regions intermediate said apex portions, two of said apex portions comprising reversely bent ribbon portions configured toform generally pointed apex terminations when viewed in plan, and the third apex portion being formed by free ends of the conductive ribbon disposed in closely spaced adjacency, each said free end having an extension configured to extend outwardly and rearwardly from the adjoining end; three cathode heaters each having a pair of leads connected across a corresponding one of the gaps in said ribbon; and three rods of vitreous material each of which rods has one of said apex portions embedded therein.

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  • Electrodes For Cathode-Ray Tubes (AREA)
US00256979A 1972-05-25 1972-05-25 Cathode heater support Expired - Lifetime US3769547A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25697972A 1972-05-25 1972-05-25

Publications (1)

Publication Number Publication Date
US3769547A true US3769547A (en) 1973-10-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00256979A Expired - Lifetime US3769547A (en) 1972-05-25 1972-05-25 Cathode heater support

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US (1) US3769547A (pt)
BR (1) BR7303755D0 (pt)
CA (1) CA988143A (pt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835344A (en) * 1972-05-25 1974-09-10 Philco Ford Corp Apparatus for supporting cathode heaters
WO1987007340A1 (en) * 1986-05-20 1987-12-03 Wright Line, Inc. Decorative sound absorbing panel for furniture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55102146A (en) * 1979-01-31 1980-08-05 Toshiba Corp Directly-heated cathode structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134923A (en) * 1960-08-22 1964-05-26 Rca Corp Plural parallel electron-guns
US3238409A (en) * 1964-03-04 1966-03-01 Rca Corp Electron-guns

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3134923A (en) * 1960-08-22 1964-05-26 Rca Corp Plural parallel electron-guns
US3238409A (en) * 1964-03-04 1966-03-01 Rca Corp Electron-guns

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835344A (en) * 1972-05-25 1974-09-10 Philco Ford Corp Apparatus for supporting cathode heaters
WO1987007340A1 (en) * 1986-05-20 1987-12-03 Wright Line, Inc. Decorative sound absorbing panel for furniture

Also Published As

Publication number Publication date
CA988143A (en) 1976-04-27
BR7303755D0 (pt) 1974-07-11

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Legal Events

Date Code Title Description
AS Assignment

Owner name: LORAL AEROSPACE CORP. A CORPORATION OF DE, NEW Y

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FORD AEROSPACE CORPORATION, A DE CORPORATION;REEL/FRAME:005906/0022

Effective date: 19910215