US3357459A - Method of making a flat wire grid - Google Patents

Method of making a flat wire grid Download PDF

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Publication number
US3357459A
US3357459A US464971A US46497165A US3357459A US 3357459 A US3357459 A US 3357459A US 464971 A US464971 A US 464971A US 46497165 A US46497165 A US 46497165A US 3357459 A US3357459 A US 3357459A
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US
United States
Prior art keywords
wires
frame
grid
sides
rods
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
US464971A
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English (en)
Inventor
Cahen Roger Raymond
Driffort Jean Pierre
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CFT CIE FRANCAISE DE TELEVISIO
CFT-COMPAGNIE FRANCAISE DE TELEVISION
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CFT CIE FRANCAISE DE TELEVISIO
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Application filed by CFT CIE FRANCAISE DE TELEVISIO filed Critical CFT CIE FRANCAISE DE TELEVISIO
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Expired - Lifetime legal-status Critical Current

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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
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0024—Planar grids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0025—Manufacture by winding wire upon a support

Definitions

  • ABSTRACT OF THE DISCLOSURE A method of making a wire grid for a cathode ray tube in which a continuous wire is wound on two spacedly parallel, grooved winding rods to form two parallel sheets of parallel wires, the two sheets are brought to rest on a second pair of grooved rods, and are tensioned to form a single sheet of wires extending in a common plane. The single sheet is then sealed without distortion to opposite sides of a frame which were resiliently flexed toward each other prior to the sealing operation and are maintained in their flexed condition during sealing by applied forces which are thereafter relaxed.
  • the present invention relates to improvements in the manufacture of flat grids used in cathode ray tubes.
  • cathode ray tubes for colour television have a luminescent screen with parallel strips of diflierent phosphors and in front of the screen one or more grids of Wires arranged parallel to the strips on the luminescent screen.
  • these grids have a large area, for example, about 1500 sq. cm. and may comprise, for example, nearly five hundred wires.
  • the slops of the wires, their parallelism and the planarity of the grid must be of a high degree of precision within a limit of one hundredth of a millimetre, for example.
  • the wire tension must be high in order to maintain this precision and, in particular, to avoid vibrational phenomena.
  • the minimum tension of each wire must be 500 grammes and this, in view of their number requires a frame which can support several hundred kilograms.
  • the method according to the invention is of the general type wherein a sheet of wires corresponding-except for the length of the wiresto that which is to be fixed to the grid frame, is first formed between two parallel grooved rods, hereinafter referred to as positioning rods.
  • the wires are then fixed to the frame, without deformation of the sheet, by sealing them to the grid frame with a fusible sealing substance, in which they are embedded, and thereafter the useful portion of the sheet is separated from the other portions thereof by cutting the wires.
  • the precision is provided during the manufacture by the two positioning rods and their supports, that is, a permanent manufacturing apparatus and not by each individual frame.
  • the two positioning rods are threaded.
  • the present invention avoids this drawback and at the same time provides :a very convenient way of forming the desired sheet.
  • a continuous wire is wound about two spaced, grooved first or winding rods to form two sheets of Wires which are brought to rest on two grooved second or positioning rods.
  • the wires of the two sheets are then tensioned to form a single sheet of wires extending in a common plane between the positioning rods.
  • Forces are exerted to two opposite sides of a resilient frame to move the sides toward each other into a position remote from the relative position of the sides in the relaxed condition of the frame, and the wires of the single sheet are sealed to the opposite frame sides while they are maintained in the afore-mentioned common plane, and while the sides are maintained in their position remote from the relaxed position thereafter After the sealing, the forces exerted on the opposite frame sides are relaxed.
  • theintermediate portions of the opposite sides are formed with respective aligned apertures and are flexed by inserting a stay rod. through the apertures so that a threaded end of the stay rod projects from each intermediate portion in a direction away from the other intermediate portion, and by threadedly moving a nut on each end toward the associated intermediate portion to flex the same.
  • FIG. 1 shows the winding of a double sheet of wires about a Winding support with threaded rods
  • FIG. 2 shows the rectangular frame of a grid predistorted by a stay arranged along the smaller axis of the frame parallel to the direction of the wires;
  • FIG. 3 shows a frame for positioning and tensioning the wires at the level of the grid frame
  • FIG. 4 and FIG. 4A respectively are a side elevation and a plan view of the assembly formed by combining the winding support and the wire positioning and tensioning frame;
  • FIG. 5 shows the method of fixing the ends of the wire to the grid frame assuring full planarity of the sheet of wires in spite of any possible deformation of the grid frame
  • FIG. 6 shows in detail the attachment of one wire end to the grid frame and indicates in cross-section the fusible metal or enamel, and in the latter case the metallizing layer, for rendering the wires equipotential.
  • the manufacture of such a plane grid comprises four operations.
  • the first operation will be described with reference to FIG. 1.
  • a rectangular winding support consists of two channel members 1 connected to two threaded rods 2, the pitch of which is double the distance between the wires in the grid to be made, the whole arrangement being rotatable about a shaft 4.
  • the wire 7 coming from a spool 8 is laid into the threads.
  • the winding is preferably effected by rotating the support about the axis of the shaft 4.
  • each channel member 1 has holes 5 for fixing it by means of bolts to the wire positioning and tensioning frame, shown in FIG. 3.
  • the second operation relates to the predeformation of the grid frame, as shown in FIG. 2.
  • This frame is preferably formed by a metal channel, the open side of which is facing inwardly, as shown at 9 in FIG. 3.
  • the frame 9 may consist, for example, of a single channel member with a single welded joint or of several channel elements with a suitable number of welded joints.
  • This preliminary tension has the object of moving the long sides of the grid frame to the deformation limit and thus, to the limit of elasticity, so that the forces applied later to the sides through the tensioning of the wires become negligible compared with the preliminary tensioning of the frame.
  • This measure has for its object to avoid that, in the ultimately formed sheet of wires, the centre wires would be less taut than the marginal wires.
  • FIG. 3 shows, in elevation and parallel to the wires of the surface to be formed, the positioning and tensioning frame for the wires which will form the grid.
  • Each cradle has two bearings, of which that nearer the outside of the frame is larger than the other.
  • the mounting has four supports 16 provided with threaded bores, arranged inside the channel of the frame and permitting the adjustment in height of the grid frame 9 of FIG. 2 by means of four screws screwed into these four supports.
  • the drawing shows a single as sembly 15 16, a portion of channel 12 having been broken away to this effect. Only the point of the corresponding screw of another similar assembly is seen in FIG. 3, this assembly being located symmetrically to the former relative to the centre plane of the frame, perpendicular to the wires of the grid. The trace of this plane is shown in the drawing by a dash-dot line.
  • Two other assemblies 15-16 are arranged symmetrically to the former relative to plane P.
  • the pitch of their thread is equal to that of the wires of the grid to be formed.
  • the four screws 15 are so adjusted that the frame 9 is horizontal.
  • the third operation consists in positioning and tensioning the grid wires of the winding support of FIG. 1 at the level of the grid frame 9 located on the support of FIG. 3.
  • FIG. 4 shows how the positioning and tensioning frame 12 is assembled with the winding support 1 by means of bolts 17 inserted into the orifices 5 of the winding support of FIG. 1.
  • the grid frame 9 By screwing the screws 15 the grid frame 9 can be raised so that its upper surface substantially reaches the plane of the wires but without allowing the contactof the grid frame to displace the wires of the sheet.
  • FIG. 4A shows in plan view the same elements, representing only one half of the frame, the two halves being symmetrical relative to plane P.
  • the wires of the double sheet maintained by the threadt ed rods 2 are positioned in the groove of rods 14 and tensioned by the smooth rollers 18.
  • the holes 20 and screws 21 permit the fixation'of the locking beams 19, carrying studs 22 which serve to tension the wires to the desired extent.
  • the predeformation stay 10 for the grid frame is also shown.
  • the fourth operation has the object of fixing the wires of the surface 6 to the edges of the longer sides of the grid frame 9. This is achieved by embedding the wires in a sealing material, for example, a metal or an enamel. This additional substance is shown at 23 in FIG. 4, 'FIG. 4A, and FIG. 5.
  • the latter is a cross-section along a longer side of the grid frame 9 and shows that a surface of wires 6 can maintain its planarity in spite of a mechanical distortion of the grid frame due to the fact that the wires are then embedded at different heights in the retaining layer.
  • the embedding of the wires may be effected by conventional means but in order to avoid any drawbacks caused by local heating a preferred method consists in depositing the component substances of the embedding layer 23 at the required points and producing their fusion by introducing the assembly of FIG. 4 into a furnace. After cooling, the stay 10 is removed.
  • the electrical connection of the sheet can be obtained by metallizing 24 covering the embedding substance at the ends of the sheet, as shown in FIG. 6, which is a cross-section along the narrow sides of the grid 9.
  • the coefficient of expansion of the wire metal should be higher than that of the grid frame so that the final tension of the wires is suitable.
  • the coefficient of expansion of the grid frame, the positioning and tensioning frame and the winding support should be equal, so as to obtain under cold conditions a suitable spacing of the wires.
  • the invention can be applied to most flat grids, provided adequate winding and positioning rods are used.
  • the grid frame is laid on the positioning and tensioning frame in its desired position relative to the sheet of wires.
  • A. method of making a wire grid for a cathode ray tube which comprises:
  • said forces are exerted on respective portions of said opposite sides intermediate the ends thereof for flexing said intermediate portions toward each other prior to said sealing, and for maintaining said opposite sides in the flexed condition during said sealing.
  • intermediate portions are formed with respective aligned apertures, and said intermediate portions are flexed by inserting a stay rod through said apertures so that an end of the stay rod projects from each of said intermediate portions in a direction away from the other intermediate portion, said end being threaded, and threadedly moving a nut on each end toward the associated intermediate portion to flex the same.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Wire Processing (AREA)
  • Particle Accelerators (AREA)
US464971A 1964-06-25 1965-06-18 Method of making a flat wire grid Expired - Lifetime US3357459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR979564A FR1407802A (fr) 1964-06-25 1964-06-25 Perfectionnements aux grilles planes pour tubes à rayons cathodiques et à leurs procédés de fabrication

Publications (1)

Publication Number Publication Date
US3357459A true US3357459A (en) 1967-12-12

Family

ID=8833161

Family Applications (1)

Application Number Title Priority Date Filing Date
US464971A Expired - Lifetime US3357459A (en) 1964-06-25 1965-06-18 Method of making a flat wire grid

Country Status (13)

Country Link
US (1) US3357459A (de)
AT (1) AT260312B (de)
BE (1) BE665457A (de)
BR (1) BR6570583D0 (de)
CH (1) CH438417A (de)
DE (1) DE1277307B (de)
DK (1) DK111898B (de)
ES (2) ES314584A1 (de)
FR (1) FR1407802A (de)
GB (1) GB1076003A (de)
LU (1) LU48920A1 (de)
NL (1) NL146324B (de)
SE (1) SE305884B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3600778A (en) * 1968-02-01 1971-08-24 Thomson Csf Method of manufacturing the focusing grids of color television tubes
US4772238A (en) * 1987-12-30 1988-09-20 Zenith Electronics Corporation Foil mask stretching apparatus and process
US4790786A (en) * 1987-05-18 1988-12-13 Zenith Elecronics Corporation Factory fixture frame for an in-process tension mask color cathode ray tube
US4934974A (en) * 1987-12-31 1990-06-19 Zenith Electronics Corporation Factory fixture frame with means for temporarily and removably supporting an in-process tension mask for a color cathode ray tube
US5613889A (en) * 1995-07-26 1997-03-25 Nosker; Richard W. Method of making a tensioned focus mask

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS606066B2 (ja) * 1979-04-18 1985-02-15 ソニー株式会社 カラ−陰極線管のグリッド装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2068675A (en) * 1935-01-16 1937-01-26 Richard D Heller Method of and apparatus for manufacturing screens
US2772376A (en) * 1954-01-14 1956-11-27 Chromatic Television Lab Inc Grid structure for cathode-ray tubes designed for polychrome image reproduction
US2824251A (en) * 1952-01-08 1958-02-18 Chromatic Television Lab Inc Method and apparatus for fabricating grid structures for cathode-ray tubes
US2998033A (en) * 1957-02-12 1961-08-29 Sylvania Electric Prod Apparatus for producing cathode ray tubes
US3212532A (en) * 1963-02-19 1965-10-19 Westinghouse Electric Corp Grid winding

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2068675A (en) * 1935-01-16 1937-01-26 Richard D Heller Method of and apparatus for manufacturing screens
US2824251A (en) * 1952-01-08 1958-02-18 Chromatic Television Lab Inc Method and apparatus for fabricating grid structures for cathode-ray tubes
US2772376A (en) * 1954-01-14 1956-11-27 Chromatic Television Lab Inc Grid structure for cathode-ray tubes designed for polychrome image reproduction
US2998033A (en) * 1957-02-12 1961-08-29 Sylvania Electric Prod Apparatus for producing cathode ray tubes
US3212532A (en) * 1963-02-19 1965-10-19 Westinghouse Electric Corp Grid winding

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3600778A (en) * 1968-02-01 1971-08-24 Thomson Csf Method of manufacturing the focusing grids of color television tubes
US4790786A (en) * 1987-05-18 1988-12-13 Zenith Elecronics Corporation Factory fixture frame for an in-process tension mask color cathode ray tube
US4772238A (en) * 1987-12-30 1988-09-20 Zenith Electronics Corporation Foil mask stretching apparatus and process
US4934974A (en) * 1987-12-31 1990-06-19 Zenith Electronics Corporation Factory fixture frame with means for temporarily and removably supporting an in-process tension mask for a color cathode ray tube
US5613889A (en) * 1995-07-26 1997-03-25 Nosker; Richard W. Method of making a tensioned focus mask

Also Published As

Publication number Publication date
SE305884B (de) 1968-11-11
BE665457A (de) 1965-10-01
AT260312B (de) 1968-02-26
CH438417A (fr) 1967-06-30
LU48920A1 (de) 1965-08-25
ES318475A1 (es) 1966-03-16
GB1076003A (en) 1967-07-19
NL6508168A (de) 1965-12-27
ES314584A1 (es) 1966-03-01
FR1407802A (fr) 1965-08-06
NL146324B (nl) 1975-06-16
DK111898B (da) 1968-10-21
DE1277307B (de) 1968-09-12
BR6570583D0 (pt) 1973-07-10

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