US3284653A - Cathode ray tube with a grid of single continuous wire - Google Patents

Cathode ray tube with a grid of single continuous wire Download PDF

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Publication number
US3284653A
US3284653A US271634A US27163463A US3284653A US 3284653 A US3284653 A US 3284653A US 271634 A US271634 A US 271634A US 27163463 A US27163463 A US 27163463A US 3284653 A US3284653 A US 3284653A
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United States
Prior art keywords
grid
frame
rods
grooves
continuous wire
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Expired - Lifetime
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US271634A
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English (en)
Inventor
France Henri De
Cahen Roger Raymond
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Compagnie Francaise de Television SA
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Cft Comp Fse Television
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Publication date
Application filed by Cft Comp Fse Television filed Critical Cft Comp Fse Television
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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
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • H01J29/803—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching for post-acceleration or post-deflection, e.g. for colour switching

Definitions

  • the present invention relates to cathode ray tubes. more particularly of the type comprising a grid placed in front of the screen and having dimensions comparable to those of the screen.
  • the beam or beams from one or more electronic guns generally reach the phosphor strips of the screen through a grid which is aimed at correctly focusing the electrons, where desired, while also post-accelerating them.
  • the grid wire elements building up the useful wire surface must be rigidly attached at their ends. be exactly parallel to each other and lie in the same plane.
  • a grid comprising a frame. two parallel rods fixed to said frame, and a continuous wire extending from one rod to the other and forming between said rods a plane wire surface; each one of said rods comprising a longitudinal face, said face comprising substantially transversal parallel grooves, and thread elements separating said grooves; each of said thread elements terminating, at one end. in an overhanging portion; said continuous wire passing through at least some of said grooves of each of said rods, and. when two grooves through which it passes consecutively belong to the same rod, also passing under the overhanging portion or portions separating those two grooves.
  • the grooves are arcuate, each of them presenting a point such that the tangent thereto is parallel to said wire surface, each wire element leaving the groove through which it passes in the direction of said tangent.
  • the frame of the grid is a rather light metal frame and is sealed along its periphery into the envelope of the tube, the strength of the frame necessary for tensioning the grid wire elements being mainly due to this sealing.
  • FIG. 1 is a horizontal sectional view illustrating very diagrammatically a colour television tube with a focusing grid, of a known type
  • FIG. 2 is a perspective view of an embodiment of the grid frame for a grid according to the invention.
  • FIG. 3 is a sectional view of a detail view of FIG. 2;
  • FIG. 4 shows a preferred positioning of the grid frame of FIG. 2 in a tube according to the invention
  • FIG. 5 illustrates a method of winding the wire on the frame of FIG. 2
  • FIG. 6 is a view, on an enlarged scale, of a detail of FIG. 4;
  • FIG. 7 is a partial sectional view of a grid and screen assembly as secured in a tube.
  • FIG. 8 is a partial sectional view of a tube, incorporating the grid and screen assembly of FIG. 7.
  • FIG. 1 there is shown, very diagrammatically and in section, a colour television tube including three guns, a focusing grid and a phosphor strip screen.
  • the tube envelope comprises a flared portion 1, which may be of glass, or of metal capable of being welded to glass, and the generally curved glass wall 2, peripherically scaled at 3.
  • This envelope may have a circular or rectangular section.
  • a focusing grid 4 formed of wires and a screen 5 is positioned between wall 2 and grid 4.
  • Screen 5 is formed of phosphor strips of the three primary colours, which may be for example red, green and blue.
  • grid 4 and screen 5 are brought to respective potentials Vg and Ve, by means of metal connections sealed in the envelope.
  • Three guns 6, 7 and 8 are located at the neck of the envelope.
  • the electrons beams emitted by the guns converge at P, are focused and post-accelerated by grid 4 and impinge then upon screen 5, voltage Ve being generally much higher than voltage Vg.
  • the beams are deflected by the deflector system, only a portion 9 of which is visible in the figure, so as to sweep the whole of the surface of screen 5.
  • This type of tube is known and is illustrated by way of example with a view towards showing how the invention improves the arrangement of the grid within the tube.
  • FIG. 2 shows in perspective the metal grid frame 10 for a tube according to the invention, having a rectangular section. This frame is formed with four holes 11 which serve for supporting screen 5.
  • Frame 10 has a small thickness so that by itself it is not sufiiciently strong for correctly supporting the wires of the grids.
  • Frame 10 has greater dimensions than those of the inner section, and preferably of the outer section, of the envelope into which it is built.
  • the frame is made of a metal having an expansion coefficient matched to that of the glass of which the envelope is made.
  • Rods 12 are secured to the frame, for example, by means of screws 14 as shown in section in FIG. 3.
  • overhanging projections 29 are formed, which projections serve for anchoring the wire elements extending across the aperture of the frame.
  • frame 10 can be secured to the periphery of the flared portion 1 thereof, for example by sealing it by means of enamel 16, as shown in section in FIG. 4, thus imparting thereto mechanical strength.
  • the sealing operation is effected by depositing, along the edge of the glass envelope, an enamel paste 16, the expansion coefficient of which matches that of glass and of the metal frame 10.
  • the assembly is put into in an oven brought to a temperature such that the enamel is caused to fuse and thus ensures a correct sealing.
  • the assembly is then cooled and the wires can then be wound on frame 10 to form the grid.
  • the latter may be built of metal and frame 10 may be soldered thereto, for example electrically.
  • FIG. 5 which is a drawing at a very enlarged scale
  • the grid is formed by a single continuous wire, which is wound around the lower portion of the teeth or overhanging thread ends 29.
  • Wire 15 is secured at one of its ends to a screw 17, runs along the bottom of the groove between the two first adjacent threads, is stretched across the aperture of frame 10, passes between the two first threads of the other rod 12, passes under the end of the adjacent thread, is returned to the first rod 12 to pass under the end of the adjacent thread and so on, as shown in FIG. 5.
  • the wires extending across the aperture of frame are thus kept parallel, due to the constant spacing between the threads, and the grid is flat because the points at which the wire leaves the grooves of each rod are respectively located along the two' parallel straight lines.
  • the wire end is attached to another screw 17 (not illustrated). Screws 17 are threaded in the frame of the grid.
  • Rods 12 thus insure the attachment of the wires, keep them parallel and makes the obtained useful wire surface flat.
  • FIG. 6 is a fragmentary, sectional view of the tube, with the grid frame sealed into the flared portion of the tube envelope by means of an enamel coating 16.
  • the figure shows the cross-section of the threaded rod 12, which is secured by a screw 14 to the frame 10 of the grid, and the wire 15 passing around the threads of rod 12.
  • a coating of enamel 18 is deposited along the edge of the sharp end of rod 12 to seal the end of each wire element thereto and keep it attached to it, even if a temporary expansion occurs, for example during the vitrification of the enamel or the annealing of the enclosure.
  • the mounting of the grid-screen assembly is shown in FIG. 7.
  • the phosphor screen 5, the phosphors of which are shown at 19, is secured on frame 23 by a plurality of blocks 24, for example four, and screws 25.
  • Frame 23 of the screen is fixed at a convenient distance from grid 15 by means of four rods 20 of an insulting material. Rods 20 are secured to the screen frame 23 and to the grid frame It) by means of crimped sockets 22 and 21. Socket 22 may be readily set into an ovally shaped recess of frame 23, so as to lock in positon the parallel grid wire elements with respect to the phosphor strips.
  • the envelope may be closed by the dish shaped end portion 27 of the envelope, as shown in FIG. 8. This end portion is also sealed by means of an enamel coating 26, in the same manner as frame 10.
  • the voltage Ve lead in is formed as a metal conductor 28, sealed into portion 27 of the tube.
  • connection for applying voltage Vg to grid may be made at that portion of frame 10 which is outside the envelope.
  • the outer perimeter of grid frame 10 should be greater than that of the flared portion 1 of the tube and of the end portion 27. This makes it possible to effect the enamel sealings, 16 and 26 under better conditions, even when the portions 1 and 27 do not have exactly the same section.
  • the accepted margins in glass technics are such that incomplete juxtaposition may readily take place between portions 1 and 27, which would harmfully affect the mechanical resistance of the joints.
  • the rods 12 may have various sections, the essential feature being that the rod should have a grooved face, having a common edge with another face, which is so directed that the thread or projections separating the grooves from each other should have an overhanging terminal portion, which may be readily used for guiding and anchoring the grid wires.
  • the wire elements building up the grid should not be equidistant.
  • the grooves are not equidistant or, if they are, not all of them receive wire elements.
  • the grid may also be built with a frame having by itself a sufficient strength for supporting tensioned wire elements.
  • the grid and screen assembly is in this case mounted within the tube in a conventional manner, for example by means of four spring leaves, which are laterally affixed to the four sides of the frame by one of their respective ends, the opposite ends having an aperture which is engaged by an element which is sealed to the envelope.
  • a grid comprising a frame, two parallel rods fixed to said frame, and a continuous wire extending from one rod to the other and forming between said rods a plane wire surface; each one of said rods comprising: a longitudinal face, said face comprising substantially transversal parallel grooves, and thread elements separating said grooves; each of said thread elements terminating, at one end, in an overhanging portion; said continuous wire passing through at least some of said grooves of each of said rods, and under at least some of said overhanging portions of said thread elements of each of said rods.
  • a grid comprising a plane frame, two parallel rods fixed to said frame, and a continuous wire; the lateral surface of each one of said rods comprising at least:
  • a second longitudinal portion including the top portion of said surface comprising substantially transversal arcuate grooves, and corresponding thread elements separating said grooves;
  • a cathode ray-tube comprising an envelope, a screen and a grid parallel to said screen; said grid comprising a metal frame, two parallel rods, and a continuous wire; said frame comprising at least a portion peripherically sealed in said envelope, and an inner portion Within said envelope; said two parallel rods being fixed to said inner portion of said frame; the lateral surface of each one of said rods comprising at least a longitudinal portion resting on said frame;
  • a second longitudinal portion including the top portion of said surface, and comprising substantially transversal parallel arcuate grooves, and corresponding thread elements separating said grooves;
  • a cathode ray tube comprising an envelope, a screen and a grid parallel to said screen; said envelope comprising a dish shaped portion and a flared portion; said grid comprising a metal frame, two parallel rods, and a continuous wire; said frame having a portion peripherically scaled to said dish portion and to said flared portion, an inner portion within said envelope, and an outer portion projecting outward of said envelope; said rods being fixed to said inner portion of said frame; the lateral surface of each one of said rods comprising at least a longitudinal base portion resting on said frame;
  • a second longitudinal portion including the top portion of said surface, and comprising substantially transversal parallel arcuate grooves, and corresponding thread elements separating said grooves;
  • said continuous wire passing through said grooves of each of said rods, and under alternate ones of said overhanging portions of said thread elements of each of said rods and being scaled to said alternate ones of said overhanging portions.
  • said sealed portion of said frame is sealed with enamel to said dish shaped portion and to said flared portion.
  • a cathode ray tube comprising an envelope, a screen having phosphor strips, a grid, and means for maintaining said screen in parallel spaced relationship with said grid; said envelope comprising a dish shaped glass portion and a flared glass portion; said grid comprising a metal frame, two parallel rods and a continuous wire; said metal frame comprising an inner portion within said envelope, a portion sealed to said dish shaped portion and to said flared portion of said envelope, and an outer portion projecting outward of said envelope; said maintaining means and said rods being fixed to said inner portion of said frame; the lateral surface of each one of said rods comprising:
  • a second longitudinal portion including the top portion of said surface, and comprising substantially transversal parallel arcuate grooves, each of said grooves having a point where the tangent to said groove is substantially parallel to said strips, and corresponding thread elements separating said grooves;
  • An assembly for a cathode ray tube comprising: a screen with phosphor strips; a grid comprising a frame, two parallel rods fixed to said frame, a continuous wire, and means, fixed to said frame and to said screen for maintaining said grid and said screen in parallel spaced relationship, the lateral surface of each one of said rods comprising:
  • a second longitudinal portion including the top portion of said surface, and comprising substantially transversal arcuate grooves, each of said grooves having a tangent point where the tangent to said groove is substantially parallel to said strips, and corresponding thread elements, separating said grooves;
  • said continuous wire passing through said grooves of each of said rods, and under alternate ones of said overhanging portions of said thread elements of each of said rods, and being sealed to said alternate ones of said overhanging portions.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US271634A 1962-04-18 1963-04-09 Cathode ray tube with a grid of single continuous wire Expired - Lifetime US3284653A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR894864A FR1328450A (fr) 1962-04-18 1962-04-18 Perfectionnements aux tubes cathodiques munis d'une grille de grandes dimensions

Publications (1)

Publication Number Publication Date
US3284653A true US3284653A (en) 1966-11-08

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US271634A Expired - Lifetime US3284653A (en) 1962-04-18 1963-04-09 Cathode ray tube with a grid of single continuous wire

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US (1) US3284653A (en, 2012)
AT (2) AT245062B (en, 2012)
BE (1) BE630956A (en, 2012)
CH (1) CH430887A (en, 2012)
DE (2) DE1268282B (en, 2012)
DK (2) DK108312C (en, 2012)
ES (1) ES287050A1 (en, 2012)
FR (1) FR1328450A (en, 2012)
GB (2) GB1042374A (en, 2012)
LU (1) LU43539A1 (en, 2012)
NL (2) NL291666A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3478242A (en) * 1966-05-13 1969-11-11 Domenick Ciccotto Cathode ray tube having image-forming elements in displaced,parallel planes
US3489966A (en) * 1966-03-10 1970-01-13 Georges Bradu Cathode ray tube with stainless steel grid sealed into glass envelope

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704094A (en) * 1985-12-09 1987-11-03 Tektronix, Inc. Cathode ray tube and method of manufacture

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2026725A (en) * 1932-04-11 1936-01-07 Baker Donald Jerome Television system and method
US2778161A (en) * 1953-09-15 1957-01-22 Chromatic Television Lab Inc Method of undulating rods for electrode structures
US2897392A (en) * 1956-02-09 1959-07-28 Zenith Radio Corp Color television tube mask and frame assembly
US2936391A (en) * 1957-07-29 1960-05-10 Sylvania Electric Prod Frame grid
US2957140A (en) * 1957-05-01 1960-10-18 Franklin H Harris Cathode ray signal storage device
US3069586A (en) * 1961-04-19 1962-12-18 Antoniades Basil Mesh support assembly for a pickup tube
US3112421A (en) * 1960-08-12 1963-11-26 Paramount Pictures Corp Display screen grid structure for color television tubes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE526096A (en, 2012) * 1953-03-23

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2026725A (en) * 1932-04-11 1936-01-07 Baker Donald Jerome Television system and method
US2778161A (en) * 1953-09-15 1957-01-22 Chromatic Television Lab Inc Method of undulating rods for electrode structures
US2897392A (en) * 1956-02-09 1959-07-28 Zenith Radio Corp Color television tube mask and frame assembly
US2957140A (en) * 1957-05-01 1960-10-18 Franklin H Harris Cathode ray signal storage device
US2936391A (en) * 1957-07-29 1960-05-10 Sylvania Electric Prod Frame grid
US3112421A (en) * 1960-08-12 1963-11-26 Paramount Pictures Corp Display screen grid structure for color television tubes
US3069586A (en) * 1961-04-19 1962-12-18 Antoniades Basil Mesh support assembly for a pickup tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489966A (en) * 1966-03-10 1970-01-13 Georges Bradu Cathode ray tube with stainless steel grid sealed into glass envelope
US3478242A (en) * 1966-05-13 1969-11-11 Domenick Ciccotto Cathode ray tube having image-forming elements in displaced,parallel planes

Also Published As

Publication number Publication date
AT255503B (de) 1967-07-10
DE1268282B (de) 1968-05-16
NL291666A (en, 2012)
BE630956A (en, 2012)
DE1764190A1 (de) 1971-06-03
GB1042373A (en) 1966-09-14
DK108312C (da) 1967-11-13
LU43539A1 (en, 2012) 1963-06-11
FR1328450A (fr) 1963-05-31
AT245062B (de) 1966-02-10
NL137799C (en, 2012)
CH430887A (fr) 1967-02-28
GB1042374A (en) 1966-09-14
ES287050A1 (es) 1963-10-16
DK116373B (da) 1970-01-05

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