US3710164A - Convergence cup with one-piece shield - Google Patents

Convergence cup with one-piece shield Download PDF

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US3710164A
US3710164A US00102764A US3710164DA US3710164A US 3710164 A US3710164 A US 3710164A US 00102764 A US00102764 A US 00102764A US 3710164D A US3710164D A US 3710164DA US 3710164 A US3710164 A US 3710164A
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shield
flange
cup
tabs
pole pieces
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US00102764A
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F Rimmler
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Stanley Works
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Stanley Works
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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
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices

Definitions

  • a convergence cup for use in color kinescopes includes an improved shield structure for magnetically separating the pairs of pole pieces.
  • the one-piece shield is formed from a single metal strip with tabs at its ends by bending it 180 along a lateral line and cutting from the strip a third tab extending from the bend line, and bending the resulting legs 120 outwardly along central lateral lines to form a Y-shaped shield.
  • the one-piece shield is then secured in position inside the cup by spot welding the tabs to the cup wall.
  • This invention relates to convergence cups'for color kinescopes and, in particular, to an improved magnetic shield for use in such convergence cups and the method of forming the cup.
  • the most common type of color kinescope (color television picture tube) includes three electron guns that direct parallel electron beams in the direction of the screen.
  • the beams are directed through a mask, having a dense array of openings, to a phospher dot pattern on the face of the screen.
  • the originally parallel beams produced by the electron guns must be deflected so that they converge towards each other and meet at the openings in the mask.
  • Structure in the kinescope for causing convergence of the electron beams includes an assembly, commonly referred to as a convergence cup, mounted in the neck of the tube in front of the electron guns.
  • the convergence cup includes three pairs of magnetic poles, one pair for each electron beam, which form parts of magnetic circuits for establishing magnetic fields through which the electron beams pass and by which they are deflected to converge at the mask.
  • the convergence cup must be manufactured from high grade materials to relatively high tolerances, if it is to operate properly, particularly in view of the fact that color kinescopes are mass produced. Hence the specific structure of the cup and various manufacturing operations used to make the cup are of importance in meeting the tolerance requirements.
  • One form of convergence cup that has been widely manufactured and used comprises a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base.
  • the base has punched openings through which the electron beams will pass, and the flange has openings to provide for the installation of the pole pieces and an internal shield which magnetically separates the pairs of pole pieces.
  • the most widely used magnetic shield structure includes three strips bent 120 intermediate their ends and inserted in the cup to form a Y- shaped shield. This results in extra manufacturing operations, including extra spot welds, and the use of sizable quantities of the magnetic metal, a disadvantage in view of the cost of the high nickel content metal.
  • the inventive convergence cup comprises a cup-like body having a circular base and cylindrical flange extending from the perimeter of the base.
  • the flange is formed with elongated openings aligned with its axis, one opening for each of the six poles that make up the three .pole pairs.
  • the pole pieces are generally L-shaped members formed of magnetic material with their longer portions constituting the pole portion and extending generally radially inwardly from the flange. The shorter leg of the L abuts the external surface of the flange and is attached thereto such as by spot welding.
  • the magnetic shield structure of the convergence cup which provides the substantial advantages of the invention, comprises a single metal strip bent to form a one-piece Y-shaped shield that magnetically separates the pairs of pole pieces. More specifically, the Y- shaped shield is formed from a single strip of metal by the method of bending the strip 180 along a lateral line intermediate its ends and then bending the two resulting legs outwardly along lateral lines intermediate their ends. To fasten the Y-shaped shield to the flange, two tabs extending from the ends of the strip and a third tab cut from the strip and extending from the bend are provided, such tabs being oriented to extend circumferentially of the cylindrical flange. In one embodiment of the invention, the tabs extend through three slots in the cylindrical flange and are attached by spot welding to the external surface of the flange.
  • the Y- shaped shield is fastened in position by welding the tabs to the interior surface of the flange.
  • FIG. 1 is a plan view of a convergence cup formed in accordance with the present invention
  • FIG. 2 is an elevation of the convergence cup of FIG.
  • FIG. 3 shows a single metal strip from which is formed the one-piece Y-shaped shield shown in FIG. 1;
  • FIG. 4 shows a modified embodiment of the inventive convergence cup
  • FIG. 5 is an elevation of the convergence cup of FIG. 4.
  • the convergence cup includes a cup-like body 10 formed by a circular base 11 and a cylindrical flange 12 extending perpendicularly from the perimeter of the base.
  • the base and flange are integral parts of a one-piece drawn cup of a non-magnetic material.
  • Three circular apertures 13 in the base 11 are located 120 apart and equidistant from its axis.
  • the apertures 13 pass electron beams from three electron guns of a color kinescope through the convergence cup and, in addition, receive circular flanges associated with the gun assembly to attach it physically to the convergence cup.
  • the base 11 is also formed with six circumferentially spaced-apart bosses 14 that project from its bottom surface and serve as spacers to orient the convergence cup with respect to the other elements of the electron gun assembly.
  • the cylindrical flange 12 is formed with three circumferentially spaced-apart pairs of openings 15.
  • Each opening 15 is substantially rectangular and oriented with its longer axis aligned with the axis of the flange 12.
  • the openings '15 are each formed by cutting along one long edge and the two ends of the potential opening, and then bending inwardly the resulting rectangular piece to provide an inturned rib 16 extending along the other longer edge of the opening 15.
  • Each pair of openings receives a pair of pole pieces 17, and the ribs 16 are cut and bent so that they extend along adjacent edges of juxtaposed openings.
  • the openings are substantially wider than the thickness of the pole pieces to facilitate both the forming of the openings and the insertion of the pole pieces during assembly. Note that the ribs strengthen the relatively thin wall of the flange and make it less likely that distortion will occur during handling and manufacturing of the cup.
  • each pole piece 17 bears against the outer surface of the flange l2, and for each pair of poles, extends in a direction away from the other pole. ln assembling the convergence cup, each pole piece 17 is inserted into one of the openings and positioned so that the longer leg 17a abuts the rib 16 of that opening. Each pole piece is then secured in position and spot welded at welds 18 to attach the leg 17b to the flange.
  • a novelone-piece Y-shaped magnetic shield is used to divide the volume within the cylindrical flange 12 into three magnetically shielded sections with one of the pairs of pole pieces 17 in each section.
  • a flat metal strip 20 is formed with tabs 21 extending from its ends at its upper edge.
  • a lateral bend line 22a intermediate the strip ends functions to divide the strip into two legs.
  • the strip 20 is bent l80 along the bend line 22a to form shield sections 22 and, at the same time, a further tab 23, indicated by dashed lines 24, is cut from the strip 20.
  • 120 bends along lateral bend lines 25a are made to form shield sections 25 and the tabs 21 and 23 are bent slightly more than 90, as shown in FIG. 1, to extend circumferentially of the flange 12 when the shield 19 is inserted into the cup. 7
  • the shield is inserted in the cup with the tabs 21 and 23 extending through openings 26 in the flange 12.
  • circumferentially extending tabs 21 and 23 are then spot welded by welds 27 to the flange 12 to complete the convergence cup.
  • the inventive one-piece shield With the inventive one-piece shield, a saving of more than one-third of the relatively expensive magnetic material (on the orderof 50 percent nickel content ordinarily is required in the shield material) used in the conventional three-piece shield is achieved. Moreover, even if a two-piece shield were to be used, the inventive Y-shaped shield 19 greatly simplifies the manufacturing process since its one-piece construction requires only simple bends and cuts for fabrication, and also by reason of the use of the cut tabs formed directl from the metal strip 20. Note that the inventive shie d uses only three tabs, while multipiece shields use superfluous tabs, e.g., the three-piece shield uses six tabs, all of which must be spot welded. it is evident that inserting the magnetic shield into the convergence cup and welding it in position is much simpler with the onepiece shield 19 than with a three-piece or two-piece shield.
  • the shield 19 is sized so that the tabs 21 and 23 extend circumferentially of the inner surface of the flange. Spot welding the tabs then secures the shield at its desired position in the convergence cup.
  • a convergence cup for use in color kinescopes comprising a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base, three circumferentially spacedapart pairs of pole pieces radially extending inwardly through the flange, three apertures in the circular base adapted to pass electron beams between the pole pieces, and a one-piece shield dividing the volume within the cylindrical flange into three sections to magnetically separate the pairs of pole pieces, the onepiece shield being formed from a single flat magnetic metal strip bent 180 along a lateral line intermediate its ends and having the two resulting legs bent outwardly along lateral lines intermediate their ends to provide the Y-shaped shield, and means fastening the shield to the flange comprising two tabs respectively extending from the ends of the legs and a third tab cut from the strip and extending from the bend intermediate the metal strip ends, each of the tabs being oriented to extend through a slot provided in the flange and extend circumferentially of the cylindrical flange on

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Abstract

A convergence cup for use in color kinescopes includes an improved shield structure for magnetically separating the pairs of pole pieces. The one-piece shield is formed from a single metal strip with tabs at its ends by bending it 180* along a lateral line and cutting from the strip a third tab extending from the bend line, and bending the resulting legs 120* outwardly along central lateral lines to form a Y-shaped shield. The onepiece shield is then secured in position inside the cup by spot welding the tabs to the cup wall.

Description

United States Patent 1 Rimmler 1 Jan. 9, 1973 [54] CONVERGENCE CUP WITH ONE- PIECE SHIELD [75] Inventor:
[73] Assignee: The Stanley Works, New Britain,
Conn.
22 Filed: Dec. 30, 1970 [2]] Appl. No.: 102,764
52 us. (:1... ..313/77,313/79 51 int. Cl .1101; 29/08, H01 j 29/02, H01 j 3 1/20 58 Field ofSearch ..313/77, 70 c, 69 c, 79
[56] References Cited UNITED STATES PATENTS 3,324,323 6/1967 Burdick m1 ..313 70cx 3,440,468 4/1969 Suzuki et al. ..3l3/77 X Fred F. Rimmler, Manhasset, N.Y.
[2/1970 McQueen et al. ..3l3/77 9/1971 Tsuneta et al. ..3l3/70 C Primary Examiner-Robert Segal Attorney-Brumbaugh, Graves, Donohue & Raymond [57] ABSTRACT A convergence cup for use in color kinescopes includes an improved shield structure for magnetically separating the pairs of pole pieces. The one-piece shield is formed from a single metal strip with tabs at its ends by bending it 180 along a lateral line and cutting from the strip a third tab extending from the bend line, and bending the resulting legs 120 outwardly along central lateral lines to form a Y-shaped shield. The one-piece shield is then secured in position inside the cup by spot welding the tabs to the cup wall.
2 Claims, 5 Drawing Figures PAIENTEDJAH' 9 I975 3.7 l O. 164
HIE
' BY v W MIDM -I- M his CONVERGENCE CUP WITH ONE-PIECE SHIELD BACKGROUND OF THE INVENTION This invention relates to convergence cups'for color kinescopes and, in particular, to an improved magnetic shield for use in such convergence cups and the method of forming the cup.
The most common type of color kinescope (color television picture tube) includes three electron guns that direct parallel electron beams in the direction of the screen. The beams are directed through a mask, having a dense array of openings, to a phospher dot pattern on the face of the screen. The originally parallel beams produced by the electron guns must be deflected so that they converge towards each other and meet at the openings in the mask. Structure in the kinescope for causing convergence of the electron beams includes an assembly, commonly referred to as a convergence cup, mounted in the neck of the tube in front of the electron guns. The convergence cup includes three pairs of magnetic poles, one pair for each electron beam, which form parts of magnetic circuits for establishing magnetic fields through which the electron beams pass and by which they are deflected to converge at the mask.
The convergence cup must be manufactured from high grade materials to relatively high tolerances, if it is to operate properly, particularly in view of the fact that color kinescopes are mass produced. Hence the specific structure of the cup and various manufacturing operations used to make the cup are of importance in meeting the tolerance requirements.
One form of convergence cup that has been widely manufactured and used comprises a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base. The base has punched openings through which the electron beams will pass, and the flange has openings to provide for the installation of the pole pieces and an internal shield which magnetically separates the pairs of pole pieces.
Various forms of magnetic shields have been used but all have in common their fabrication from more than one metal strip. The most widely used magnetic shield structure includes three strips bent 120 intermediate their ends and inserted in the cup to form a Y- shaped shield. This results in extra manufacturing operations, including extra spot welds, and the use of sizable quantities of the magnetic metal, a disadvantage in view of the cost of the high nickel content metal.
SUMMARY OF THE INVENTION In accordance with the present invention, a novel and improved convergence cup is provided through use of a one-piece Y-shaped shield that affords many advantages over previous convergence cups. In particular, the inventive convergence cup comprises a cup-like body having a circular base and cylindrical flange extending from the perimeter of the base. As with previous forms of convergence cups, the flange is formed with elongated openings aligned with its axis, one opening for each of the six poles that make up the three .pole pairs. The pole pieces are generally L-shaped members formed of magnetic material with their longer portions constituting the pole portion and extending generally radially inwardly from the flange. The shorter leg of the L abuts the external surface of the flange and is attached thereto such as by spot welding.
The magnetic shield structure of the convergence cup, which provides the substantial advantages of the invention, comprises a single metal strip bent to form a one-piece Y-shaped shield that magnetically separates the pairs of pole pieces. More specifically, the Y- shaped shield is formed from a single strip of metal by the method of bending the strip 180 along a lateral line intermediate its ends and then bending the two resulting legs outwardly along lateral lines intermediate their ends. To fasten the Y-shaped shield to the flange, two tabs extending from the ends of the strip and a third tab cut from the strip and extending from the bend are provided, such tabs being oriented to extend circumferentially of the cylindrical flange. In one embodiment of the invention, the tabs extend through three slots in the cylindrical flange and are attached by spot welding to the external surface of the flange.
In another embodiment of the invention, the Y- shaped shield is fastened in position by welding the tabs to the interior surface of the flange.
DESCRIPTION OF THE DRAWINGS The foregoing and further advantages of the invention will be more readily understood when the following description is read in connection with the accompanying drawings, in which:
FIG. 1 is a plan view of a convergence cup formed in accordance with the present invention;
FIG. 2 is an elevation of the convergence cup of FIG.
FIG. 3 shows a single metal strip from which is formed the one-piece Y-shaped shield shown in FIG. 1;
FIG. 4 shows a modified embodiment of the inventive convergence cup; and
FIG. 5 is an elevation of the convergence cup of FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 3, which show a typical embodiment of the invention, the convergence cup includes a cup-like body 10 formed by a circular base 11 and a cylindrical flange 12 extending perpendicularly from the perimeter of the base. Preferably the base and flange are integral parts of a one-piece drawn cup of a non-magnetic material.
Three circular apertures 13 in the base 11 are located 120 apart and equidistant from its axis. The apertures 13 pass electron beams from three electron guns of a color kinescope through the convergence cup and, in addition, receive circular flanges associated with the gun assembly to attach it physically to the convergence cup. The base 11 is also formed with six circumferentially spaced-apart bosses 14 that project from its bottom surface and serve as spacers to orient the convergence cup with respect to the other elements of the electron gun assembly.
The cylindrical flange 12 is formed with three circumferentially spaced-apart pairs of openings 15. Each opening 15 is substantially rectangular and oriented with its longer axis aligned with the axis of the flange 12. Preferably the openings '15 are each formed by cutting along one long edge and the two ends of the potential opening, and then bending inwardly the resulting rectangular piece to provide an inturned rib 16 extending along the other longer edge of the opening 15. Each pair of openings receives a pair of pole pieces 17, and the ribs 16 are cut and bent so that they extend along adjacent edges of juxtaposed openings. The openings are substantially wider than the thickness of the pole pieces to facilitate both the forming of the openings and the insertion of the pole pieces during assembly. Note that the ribs strengthen the relatively thin wall of the flange and make it less likely that distortion will occur during handling and manufacturing of the cup.
The L-shaped pole pieces 17, having longer and shorter legs 17a and 17b, respectively, and formed of a magnetic material, extend generally radially inwardly through the flange. A bend is formed at each free end of the leg 17a to provide a desired flux distribution between adjacent pole pieces.
The shorter leg 17b of each pole piece bears against the outer surface of the flange l2, and for each pair of poles, extends in a direction away from the other pole. ln assembling the convergence cup, each pole piece 17 is inserted into one of the openings and positioned so that the longer leg 17a abuts the rib 16 of that opening. Each pole piece is then secured in position and spot welded at welds 18 to attach the leg 17b to the flange.
In accordance with the present invention, a novelone-piece Y-shaped magnetic shield is used to divide the volume within the cylindrical flange 12 into three magnetically shielded sections with one of the pairs of pole pieces 17 in each section. In particular, as shown in FIG. 3, a flat metal strip 20 is formed with tabs 21 extending from its ends at its upper edge. A lateral bend line 22a intermediate the strip ends functions to divide the strip into two legs.
In the novel method of manufacturing the Y-shaped shield 19, the strip 20 is bent l80 along the bend line 22a to form shield sections 22 and, at the same time, a further tab 23, indicated by dashed lines 24, is cut from the strip 20. At, the same time or subsequently, 120 bends along lateral bend lines 25a are made to form shield sections 25 and the tabs 21 and 23 are bent slightly more than 90, as shown in FIG. 1, to extend circumferentially of the flange 12 when the shield 19 is inserted into the cup. 7
To assemble the convergence cup with the Y-shaped shield 19 positioned inside the cylindrical flange 12, thereby magnetically shielding the pairs of pole pieces 17, the shield is inserted in the cup with the tabs 21 and 23 extending through openings 26 in the flange 12. The
circumferentially extending tabs 21 and 23 are then spot welded by welds 27 to the flange 12 to complete the convergence cup.
With the inventive one-piece shield, a saving of more than one-third of the relatively expensive magnetic material (on the orderof 50 percent nickel content ordinarily is required in the shield material) used in the conventional three-piece shield is achieved. Moreover, even if a two-piece shield were to be used, the inventive Y-shaped shield 19 greatly simplifies the manufacturing process since its one-piece construction requires only simple bends and cuts for fabrication, and also by reason of the use of the cut tabs formed directl from the metal strip 20. Note that the inventive shie d uses only three tabs, while multipiece shields use superfluous tabs, e.g., the three-piece shield uses six tabs, all of which must be spot welded. it is evident that inserting the magnetic shield into the convergence cup and welding it in position is much simpler with the onepiece shield 19 than with a three-piece or two-piece shield.
Referring to the embodiment of the invention shown in FIGS. 4 and 5, in which like parts are designated by like reference numerals, to eliminate the openings 26 from the flange 12, the shield 19 is sized so that the tabs 21 and 23 extend circumferentially of the inner surface of the flange. Spot welding the tabs then secures the shield at its desired position in the convergence cup.
I claim:
1. A convergence cup for use in color kinescopes comprising a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base, three circumferentially spacedapart pairs of pole pieces radially extending inwardly through the flange, three apertures in the circular base adapted to pass electron beams between the pole pieces, and a one-piece shield dividing the volume within the cylindrical flange into three sections to magnetically separate the pairs of pole pieces, the onepiece shield being formed from a single flat magnetic metal strip bent 180 along a lateral line intermediate its ends and having the two resulting legs bent outwardly along lateral lines intermediate their ends to provide the Y-shaped shield, and means fastening the shield to the flange comprising two tabs respectively extending from the ends of the legs and a third tab cut from the strip and extending from the bend intermediate the metal strip ends, each of the tabs being oriented to extend through a slot provided in the flange and extend circumferentially of the cylindrical flange on the exterior surface thereof, and each of the tabs being welded to said exterior surface.
2. A convergence cup for use in color kinescopes comprising a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base, three circumferentially spacedapart pairs of pole pieces radially extending inwardly through the flange, three apertures in the circular base adapted to pass electron beams between the pole pieces, and a one-piece shield dividing the volume within the cylindrical flange into three sections to magnetically separate the pairs of pole pieces, the onepiece shield being formed from a single flat magnetic metal strip bent 180 along a lateral line intermediate its ends and having the two resulting legs bent 120 outwardly along lateral lines intermediate their ends to provide the Y-shaped shield, and means fastening the shield to the flange comprising two tabs respectively extending from the ends of the legs and a third tab cut from the strip and extending from the 180 bend intermediate the metal strip ends, each of the tabs being oriented to extend circumferentially of the cylindrical flange on the interior surface thereof and being welded to said interior surface.

Claims (2)

1. A convergence cup for use in color kinescopes comprising a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base, three circumferentially spaced-apart pairs of pole pieces radially extending inwardly through the flange, three apeRtures in the circular base adapted to pass electron beams between the pole pieces, and a one-piece shield dividing the volume within the cylindrical flange into three sections to magnetically separate the pairs of pole pieces, the one-piece shield being formed from a single flat magnetic metal strip bent 180* along a lateral line intermediate its ends and having the two resulting legs bent 120* outwardly along lateral lines intermediate their ends to provide the Y-shaped shield, and means fastening the shield to the flange comprising two tabs respectively extending from the ends of the legs and a third tab cut from the strip and extending from the 180* bend intermediate the metal strip ends, each of the tabs being oriented to extend through a slot provided in the flange and extend circumferentially of the cylindrical flange on the exterior surface thereof, and each of the tabs being welded to said exterior surface.
2. A convergence cup for use in color kinescopes comprising a cup-like body having a circular base and a cylindrical flange extending perpendicularly from the perimeter of the base, three circumferentially spaced-apart pairs of pole pieces radially extending inwardly through the flange, three apertures in the circular base adapted to pass electron beams between the pole pieces, and a one-piece shield dividing the volume within the cylindrical flange into three sections to magnetically separate the pairs of pole pieces, the one-piece shield being formed from a single flat magnetic metal strip bent 180* along a lateral line intermediate its ends and having the two resulting legs bent 120* outwardly along lateral lines intermediate their ends to provide the Y-shaped shield, and means fastening the shield to the flange comprising two tabs respectively extending from the ends of the legs and a third tab cut from the strip and extending from the 180* bend intermediate the metal strip ends, each of the tabs being oriented to extend circumferentially of the cylindrical flange on the interior surface thereof and being welded to said interior surface.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991338A (en) * 1974-02-26 1976-11-09 U.S. Philips Corporation Convergence unit having three identical V-shape bent plates for shielding pole shoes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324328A (en) * 1964-09-28 1967-06-06 Sylvania Electric Prod Magnetic convergence assembly and electron beam shielding means for color cathode ray tubes
US3440468A (en) * 1965-12-02 1969-04-22 Nippon Columbia Three electron gun color picture tube
US3544826A (en) * 1969-04-01 1970-12-01 Griffiths Electronics Inc Convergence assembly
US3603829A (en) * 1969-05-16 1971-09-07 Tokyo Shibaura Electric Co Inline type triple electron gun assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324328A (en) * 1964-09-28 1967-06-06 Sylvania Electric Prod Magnetic convergence assembly and electron beam shielding means for color cathode ray tubes
US3440468A (en) * 1965-12-02 1969-04-22 Nippon Columbia Three electron gun color picture tube
US3544826A (en) * 1969-04-01 1970-12-01 Griffiths Electronics Inc Convergence assembly
US3603829A (en) * 1969-05-16 1971-09-07 Tokyo Shibaura Electric Co Inline type triple electron gun assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991338A (en) * 1974-02-26 1976-11-09 U.S. Philips Corporation Convergence unit having three identical V-shape bent plates for shielding pole shoes

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