US3887837A

US3887837A - Cathode ray tube

Info

Publication number: US3887837A
Application number: US353637A
Authority: US
Inventors: Akira Nakayama; Senri Miyaoka; Akio Ohkoshi
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 1972-04-25
Filing date: 1973-04-23
Publication date: 1975-06-03
Anticipated expiration: 1992-06-03
Also published as: NL177537B; JPS5128492B2; DE2320713C2; GB1406523A; FR2182086A1; FR2182086B1; AU5470773A; NL7305743A; DE2320713A1; CA987383A; NL177537C; IT1002507B; JPS494974A

Abstract

In a color picture tube having an electron gun within the neck portion of its envelope for directing and focusing a plurality of electron beams at a color phosphor screen on a face plate of the conical envelope portion, a first high voltage for operation of the gun is supplied to the latter through a conductive layer on the inner surface of the conical envelope portion, and a second high voltage required for operation of the gun is supplied to the latter by way of a lead wire extending within the conical envelope portion through a conductive tubular member which is electrically connected with the conductive layer and insulated from the lead wire. The conductive tubular member is electrically connected with the conductive layer by an arcuate spring member which further serves to accurately and securely position the tubular member and the lead wire therein within the tube envelope, thereby ensuring proper engagement with the gun of a contact member that extends from the lead wire.

Description

United States Patent Nakayama et a1.

[ CATHODE RAY TUBE [75] Inventors: Akira Nakayama, Tokyo; Senri Miyaoka, Fujisawa; Akio Ohkoshi, Tokyo, all of Japan [73] Assignee: Sony Corporation, Tokyo, Japan {22] Filed: Apr. 23, 1973 [21] Appl. No: 353,637

[30] Foreign Application Priority Data Apr. 25, 1972 Japan 47-42000 [52] US. Cl 315/368; 315/31 [51] Int. Cl. Htllj 29/70 [58] Field of Search 315/13 R, 13 CG, 308; 313/64, 70 C, 81

[56} References Cited UNITED STATES PATENTS 3,272,914 9/1966 Moles et al 1, 315/13 CG 3,461,342 8/1969 Marks 1 315/13 CG 3,575,625 4/1971 Miyaoka... 315/13 CG 3,626,232 12/1971 Ohgoshi 313/64 June 3, 1975 {57] ABSTRACT In a color picture tube having an electron gun within the neck portion of its envelope for directing and focusing a plurality of electron beams at a color phos phor screen on a face plate of the conical envelope portion, a first high voltage for operation of the gun is supplied to the latter through a conductive layer on the inner surface of the conical envelope portion, and a second high voltage required for operation of the gun is supplied to the latter by way of a lead wire ex tending within the conical envelope portion through a conductive tubular member which is electrically connected with the conductive layer and insulated from the lead wire. The conductive tubular member is electrically connected with the conductive layer by an ar cuate spring member which further serves to accurately and securely position the tubular member and the lead wire therein within the tube envelope, thereby ensuring proper engagement with the gun of a contact member that extends from the lead wire 12 Claims, 4 Drawing Figures CATHODE RAY TUBE This invention relates generally to picture tubes of the single-gun. plural-beam type. and more particulary to tubes of the type in which the plural beams are passed through the optical center of a common electron lens by which the beams are focused on the color phosphor screen.

In a single-gun. plural beam picture tubes of the described type. for example. as specifically disclosed in U.S. Pat. No. 3.448.316 issued June 3. N69. and hav ing a common assignee herewith. three laterally spaced electron beams are emitted by a beam generating or cathode assembly and directed in a common substantially horizontal plane. with the central beam coinciding with the optical axis of the single electron focusing lens and the two outer beams being converged to cross the central beam at the optical center of the lens and thus emerge from the latter along paths that are divergent from the optical axis. Arranged along such divergent paths are pairs of convergence deflecting plates having voltages applied thereto to laterally deflect the divergent beams in a substantially horizontal plane for causing all beams to converge at a point on the apertured beam selecting grill or shadow mask associated with the screen.

ln such picture tubes. the beam generating assembly, electron focusing lens and convergence deflecting plates are assembled together as a unit to form the single gun structure which is inserted into the neck portion of the glass envelope which further has a conical or funnel portion extending from the neck portion and terminating in a face panel on which the color phosphor screen is provided.

This invention is particularly directed to the means by which voltages are applied to the convergence defleeting plates of the desxribed unitary gun structure for effecting the desired convergence of the beams.

Tubes of the described type further have horizontal and verticle deflection coils for appropriate deflection of the electron beams to effect scanning of the screen. and such coils are embodied in a yoke assembly to be disposed around the tube where the neck portion and the conical funnel portion meet. In the manufacture of the tubes, it is preferable that the deflection yoke assembly. which is generally torus-like configuration, be pre-assembled and simply slid over the neck portion to the position thereof adjacent the juncture of the neck and conical funnel portions. Accordingly. it may be understood that any protuberances or projections in the nature. for example. of operating voltage pickups which extend from the surface of the neck portion will interfere with this sliding ofthe deflection yoke assembly thereover to thus complicate tube manufacture.

Further. and referring again to the manufacturing processes utilized in the production of such tubes. it will be understood that the gun structure. which includes the plural beam generating means. the focusing lens and the convergence deflecting means. and which is generally manufactured as a unit outside the tube envelope and then inserted into the neck portion. has to be precisely positioned therein. Accordingly. if anything other than a substantially smooth surface is provided at the interior of the tube neck portion. this will interfere with the free passage of the gun structure through the tube neck portion to the requisite portion thereof to thereby further complicate the tube manufacturing process.

ln U.S. Pat. No. 3.626.232. issued Dec. 7. 1971. and having a common assignee herewith. the aforementioned problems are avoided by supplying the operating voltages to the convergence deflecting plates from a common insulated terminal on the cortical portion of the glass envelope so that the neck portion may have smooth outer and inner surfaces to facilitate the installation of the deflection yoke assembly and the unitary gun structure. More specifically. in this prior patent. first and second conductive layers. which are clectri cally isolated from each other. are applied to respective inner surface portions of the conical envelope portion for receiving different high voltages. for example. an anode voltage and a convergence voltage. from respec tive electrodes of the terminal. and such conductive layers extend at least adjacent the neck portion for engagement by first and second contact elements which extend from the gun structure and transmit the anode and convergence voltages to respective convergence deflecting plates. The foregoing arrangement gives rise to manufacturing difficulties in respect of the application of the first and second conductive layers to the conical envelope portion so as to be electrically isolated from each other. Further. the second conductive layer which is exposed within the conical envelope portion and has a potential applied thereto that is different. for example. by 200 to 300 volts. from the anode volt age applied to the first conductive layer covering the major inner surface portion of the conical envelope portion may cause disturbances in the fields establised within such conical envelope portion. particularly for causing the beams to scan the screen.

Accordingly, it is an object of this invention to provide a single-gun. plural-beam picture tube having means for applying the necessary operating voltages to the convergence deflecting plates of the gun in a man ner to avoid the aforementioned problems.

More specifically. it is an object of this invention to provide a picture tube. as aforesaid. with relatively eas ily and inexpensively produced and assembled means by which an anode voltage and a convergence voltage applied to a common insulated terminal on the conical envelope portion are supplied from such terminal to the respective convergence deflecting plates of the gun structure.

A further object is to provide a picture tube. as afore said. in which the means for supplying the anode voltage and the convergence voltage from the common terminal on the conical envelope portion to the respective convergence deflecting plates is arranged to avoid disturbance of the electric or other fields established within the tube envelope.

Still another object is to ensure the accurate engagement with the gun structure inserted into the neck portion of the tube envelope of the means provided for supplying the anode and convergence voltages to the respective convergence deflecting plates of the gun structure. and further to mechanically stabilize the positioning of such means within the tube envelope.

In accordance with an aspect ofthis invention. a first high voltage. for example. the anode voltage. is sup plied from the terminal on the conical envelope portion to the gun structure through a conductive layer which is deposited on the inner surface of the conical enve lope portion and extends into the neck portion. while a second high voltage. for example. the comergence voltage. is supplied from the terminal to the gun struc- 3 ture by way of a lead wire extending through. and being electrically insulated from a conductive tubular member which is electrically connected with the conductive layer to be at the same potential as the latter. such lead wire having a contact member at one end for engage' ment with the gun structure.

In preferred embodiments of the invention. the conductive tubular member through which the lead wire extends is electrically connected with the conductive layer by means of an arcuate, conductive spring which further functions to accurately and securely position the lead wire and the associate conductive tubular member within the tube envelope. The above. and other objects, features and advantages of this invention, will become apparent from reading the following detailed description of illustrative embodiments which is to be read in conjunction with the accompanying drawings. wherein:

FIG. 1 is a schematic horizontal, axial sectional view of a single-beam, plural-beam color picture tube constructed in accordance with an embodiment of the invention;

FIG. 2 is an exploded perspective view showing details of the elements provided in the tube of FIG. 1 for supplying a high voltage to the gun structure.

FIG. 3 is an enlarged perspective view of an element provided on one of the convergence deflecting plates for receiving a high voltage; and

HO. 4 is a fragmentary perspective view illustrating another embodiment of this invention Referring in detail to FIG. I, it will be understood that the arrangement and manner of operation of the color picture tube there illustrated is similar to that disclosed in US. Pat. No. 3.448.316, which has been previously identifled.

The color picture tube depicted in FIG. 1 is of the single-gun, plural-beam type and comprises the conventional tube envelope indicated generally at E and which includes a generally cylindrical, neck portion N and an integral generally conical or funnel portion C constructed from any suitable, non-conductive material in the nature of glass.

A single gun ll is disposed in neck portion N and includes an assembly K of cathodes which function as electron beam generating sources K K and K respectively. In the illustrated embodiment. the beam generating sources K K and K,, are arranged so that the respective beams B B and B are directed parallel to each other in a common plane which may be horizontal. A first or control grid G is provided to substantially surround the electron beam generating sources, and such control grid has apertures h h it which are each aligned with a respective one of the beam generating sources.

A common grid G having apertures I2 [1 I1 is disposed adjacent the grid 6,, and the apertures of the grid G are formed in substantial alignment with the respective apertures in the fontrol grid (1,. Arranged in order following the grid g; in the direction away from the cathode assembly K are successive, generally tubular grids or electrodes G G, and G The electrodes G through (i and the cathode assembly K are assembled together and maintained in the illustrated relative posi tions by means of longitudinally extending insulating beads (not shown). The gun structure 11 is positioned within the neck portion N of the tube envelope by slidable engagement of the insulating beads with the inner surface of neck portion N,

With the application of appropriate operating voltages to control grid (1,. common grid G and electrodes G G and (3;, as is well known in the art. an electron lens field constituting an auxiliary lens L. is formed by grid G and electrode G and an electron lens field constituting a main focusing lens L is formed with its optical center approximately at the axial center of the electrode G. by the electrodes G G. and G Thus, the side electron beams B B which emanate from electron beam generating sources K,, and K will be made to converge by the auxiliary lens L so as to intersect eachother substantially at the optical center of the main focusing lens L and to emerge from the latter along diverging paths. On the other hand, the central beam B being directed along the optical axis of the auxiliary and main lenses L and L is not deflected by the auxiliary lens and passes through, and emerges from the main focusing lens along the optical axis of the latter.

In order to subsequently reconverge the electron beams B and 8;, with the electron beam B at a common spot or area in an apertures grid, grill or shadow mask A which is disposed just before the color phosphor screen S formed on face plate or panel P of the picture tube envelope. the gun further includes electron beam convergence deflecting means F. The deflecting means F comprises a pair of spaced. opposed shielding plates P and P, which extend axially of the picture tube at opposite sides of the axis of the latter, and a pair of spaced, convergence deflecting plates Q4 and O which are spaced outwardly from the shielding plates P and P respectively.

The plates P and P are electrically connected to each other and can be supported within the neck portion N in any convenient manner. For example, electrically conductive tabs 12 can extend from ends of the plates, P and P and be welded or otherwise firmly anchored to the adjacent end of electrode G The convergence deflecting plates Q Q are then supported, as by beads (not shown) of any suitable insulating material which are in turn supported from the respective shielding plates P P,, by suitable support pins. Thus. the convergence deflecting plates 0.4 and Q which are electrically connected to each other, as by a conductor 13, will be supported from the deflecting plates P, and P without any electrical connection therebetween. In the foregoing manner, the shielding plates P... P,, and convergence deflecting plates Q 0,, are disposed so that beam L3,, passes between convergence deflecting plate Q and shielding plate P beam B passes between shielding plates P P and beam B passes between shielding plate P,, and convergence deflecting plate QB.

It will be understood that the application of suitable operating voltages to the beam convergence deflecting means F will be required for operation of the latter. More specifically, a first high voltage. for example. an anode voltage of the order of l3 to 20 KV, has to be applied to shielding plates P P and a second high voltage for example. a convergence voltage which is less than the first voltage, for example, by 200 to 300 volts, has to be applied to the convergence deflecting plates Q... Q Thus. a potential difference of 200 to 300 V will be established between the plates Q. and P.. and the plates 0,, and P, to thereby provide for the desired electrostatic deflection of the respective beams B and B while enabling the undeflected passage of the electron beam B between the shielding plates P P,, which are maintained at the same potential.

In the described color picture tube It), the operating voltages for the cathode assembly K, control grid (3,. grid G and electrode G, may be applied thereto through respective leads (not shown) extending to respective pins (not shown) which project through. and are sealed in the rear end wall of the neck portion N which is conventionally formed thereon after the installation of the gun I] inthe tube envelope E. Futher, the operatinv voltage for the electrodes (1;, and G which are connected by a suitable conductive lead (not shown) extending therebetween, is preferably the same as the operating voltage to be applied to the shielding plates P, and P,,.

In accordance with this invention, the operating or anode voltages for the shielding plates P and P and hence also for the electrodes G and G and the operating or convergence voltage for the convergence deflecting plates Q, and 0,, are applied to color picture tube through a coaxial cable (not shown) which terminates in a so-called anode cap engage-able with a common terminal or anode button I4 mounted in the wall of the conical portion C of tube envelope E. The anode button or terminal 14 and the associated anode cap may be constructed in the manner disclosed in detail in the previously referred to US. Pat No. 3,626,232, and hence are not described or illustrated in detail herein. However, it will be seen on FIG. I that the anode button I4 includes a central electrode, for example, in the form ofa pin 14a, to which the convergence voltage is applied, and an annular outer electrode 14b insulated from the central electrode 14a and to which the anode voltage is applied. The inner surface of the conical envelope portion C is coated with a conductive layer 16 which is engaged by the annular outer electrode 14b to receive the anode voltage from the latter, and which extends into neck portion N, as at 160. Resilient contact mambers 15, for example, of a conductive spring material, extend from the electrode G, of gun 11 into engagement with the portion I6a of conductive layer 16 for supplying the anode voltage from the latter to electrode 0,, and hence to the electrode G and the shielding plates P and P In accordance with the present invention, the other high voltage. that is, the convergence voltage applied to the central electrode 14a, is supplied from the latter to the covergence deflecting plates 0, and 0,, by way of a lead wire 17 which is connected, at one end, to central electrode 140, and which has a contact member 18 extending from its other end for engagement with one of the convergence deflecting plates, for example. with the plate 0,, as shown, The lead wire I7 within conical envelope portion C extends through a tubular member 19 of an electrically conductive, nonmagnetic, stainless material, for example, of an iron alloy containing approximately I? to 19 wt.7r chromium, approximately 8 to It) wt./( nickel and the balance iron. The lead wire 17 is insulated from tubular member 19 by an insulating cover or sleeve 20 (FIG. 2), for example. of glass or other insulating fibers,

The conductive, non-magnetic tubular member I) is electrically connected with conductive layer 16 so as to have the anode voltage applied to member 19. As shown, the electrical connection of tubular member 19 to conductive layer [6 is preferably achieved by means of a C-shaped or arcuate spring member 2| which has the tubular member I9 welded or otherwise securely attached to its inner or concave surface, and which is dimensioned for closely engaging conductive layer 16 adjacent the junction between the neck and conical portion N and C of envelope E. The resilient or spring member 21 is also formed of a non-magnetic, electri cally conductive stainless material, for example. of the material mentioned above as being suitable for tubular member I9.

In the embodiment shown on FIG. 2, the contact member 18 is intended to engage with one of the flanges 22a, 22b extending inwardly along the opposite longitudinal edges of convergence deflecting plate 0 Such contact member I8, which may be stamped from a thin sheet of a conductive, non-magnetic stainless material, for example, the iron alloy described above with reference to tubular member I9, is shown to be generally L-shaped and to have one of its arms I8u welded to the adjacent end of lead wire 17, while its other arm 18!; which extends generally parallel to lead wire I7 has its end portion bent or reverted, as at [80, for resilient contact with the flange 2212, In order to laterally guide bent end portion 18c of contact member 18 into engagement with flange 22b and to ensure that bent end portion will not be laterally displaced outwardly from flange 22b and into contact with conductive layer 16, convergence deflecting plate 0,, is preferably provided with a guide member 23 in the form of an elongated strip (FIG. 3) having an outwardly curved front end portion 23a and an angle member along its upper edge to be welded or otherwise attached to convergence deflecting plate 0,,, as shown on FIG. 2. Thus, guide member 23 depends from lower flange 22b along the outer margin of the latter so that, when gun II is inserted forwardly into neck portion N to move convergence deflecting plate 0,, in the direction of arrow 0 on FIG. 2 relative to contact member 18, bent end portion 180 first engages the front edge of flange 22b to ensure that the contact member 18 will ride along the under surface of flange 22b, rather than over the latter, and the outwardly curved front end portion 23a of guide member 23 ensures that the bent end portion 180 will be deflected inwardly along the remainder of such guide member for secure contact with flange 22b. An insulator sleeve 24 (FIG. 2) of glass or ceramic extends around the elongated arm 18b of contact member I8 to ensure that the latter will not make electrical contact with the conductive layer I6 within neck portion N.

If desired, the contact member extending from lead wire 17 can be arranged to engage the outer surface of one of the convergence deflecting plates 0 or 0,, rather than one of the longitudinal flanges of the latter. For example, as shown on FIG. 4, such contact member 18 may include a curved, elongated arm l8'u welded at one end too the adjacent end of lead wire I7, an arm I8b extending rearwardly from arm I8'u and a reverted, bent end portion I8'c directed laterally inward from arm I8'b for slidable engagement with the outwardly facing surface of plate 0,, which is of relatively large area for secure or reliable engagement by contact member 18'. If desired, the lower, front corner of plate 0,, may be cut-away or rounded, as at 24, to avoid interference with curved arm I8'u.

It will be seen that, with the above described arrangements according to this invention, the anode voltage for electrodes G and G and for shielding plates P and P and the convergence deflecting voltage for plates Q, and Q are applied thereto from within the conical portion C of envelope E so that the inner and outer surfaces of neck portion N can be smooth to facilitate the insertion of gun 11 and the installation of the horizontal and vertical deflection yoke 25 (FIG. I Since the convergence deflecting voltage is supplied to plates Q and Q by way of the central electrode 14a of button 14, lead wire 17 and Contact member [8 or 18', the conductive layer 16 for supplying the anode voltage from the outer electrode 14b of button [4 to contact members l5, and thence to shielding plates P and P can be a continuous, uninterrupted conductive layer, particularly at the part of neck portion N of the glass cnve lope which is adjacent to conical portion C and which extends about the convergence deflecting device F. By reason of the foregoing. the generation of electrical discharges within the mentioned part of neck portion N is avoided.

Further. since the lead wire 17 extends through. and is insulated from the non-magnetic conductive tubular member 19 and the latter has the anode voltage applied thereto from conductive layer 16 by way of the locating spring member 21, the electrical fields within conical envelope portion C are not disturbed even though lead wire [7 extends in such conical portion and even though an electrical charge maybe stored in the insulator 18 between lead wire 17 and tubular member 19.

The above described embodiments of this invention have been applied to color picture tubes of the socalled in-line type in which the electron beams B B and B are generated at locations lying in a common horizontal plane. However, it will be apparent that the invention can be applied to other types of color picture or cathode ray tubes, for example, tubes having a delta arrangement of the locations at which the beams origi nate.

Having described illustrative embodiments of the invention with reference to the accompanying drawings it is to be understood that the invention is not limited to those precise embodiments, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention What is claimed is:

1. In a color picture tube including an envelope having a neck portion and a conical portion extending from said neck portion to a face plate having a screen thereon, and electron gun means disposed in said neck portion for directing and focusing a plurality of electron beams at said screen and requiring first and second high voltages of different values for the operation of said gun means; means for supplying said first and second high voltages to said gun means from within said conical portion of the envelope, comprising a conductive layer on the inner surface of said conical portion and at least the adjacent part of said neck portion and having said first high voltage applied thereto, at least one first contact member extending from said gun means and engageable with said conductive layer within said neck portion for receiving said first high voltage, a lead wire extending from within said conical portion toward said neck portion and receiving said second high voltage at the end of said lead wire remote from said neck portion, a second contact member connected with the other end of said lead wire and extending into said neck portion and being engageable with said gun means for applying said second high voltage thereto, a nonmagnetic. conductive tubular member extending around and being insulated from said lead wire within said conical portion. and means electrically connecting said tubular member to said conductive layer for applying said first high voltage to said tubular member and thereby avoiding disturbance to magnetic fields within said conical portion by said second high voltage applied to said lead wire.

2. A color picture tube according to claim I, in which said means electrically connecting said tubular member to said conductive layer includes an arcuate spring member having said tubular member fixed thereto and closely engaging said conductive layer for securely positioning said lead wire and second contact member within said envelope.

3. A color picture tube according to claim I, in which said second contact member is generally L-shaped with one arm thereof being secured to said lead wire and the other arm of said L-shaped Contact member having a reverted bent end portion for resilient engagement with said gun means.

4. In a color picture tube including an envelope having a neck portion and a conical portion extending from said neck portion to a face plate having a screen thereon, and electron gun means disposed in said neck portion for directing and focusing a plurality of electron beams at said screen and requiring first and second high voltages of different values for the operation of said gun means; means for supplying said first and second high voltages to said gun means from within said conical portion of the envelope, comprising a conductive layer on the inner surface of said conical portion and at least the adjacent part of said neck portion and having said first high voltage applied thereto. at least one first contact member extending from said gun means and engageable with said conductive layer within said neck portion for receiving said first high voltage, a lead wire extending from within said conical portion toward said neck portion and receiving said second high voltage at the end of said lead wire remote from said neck portion, a generally L-shaped second contact member having one arm thereof secured to the other end of said lead wire and another arm extending into said neck portion and having a reverted bent end portion, and in which said gun means includes a guide member extending generally parallel to the axis of said neck portion and having an arcuate end portion resiliently engageable by said bent end portion of the second contact member for guiding the latter into engagement with said gun means when the latter is inserted into said neck portion and for applying said second high voltage to said gun means. a non-magnetic. con ductive tubular member extending around and being insulated from said lead wire within said conical portion, and means electrically connecting said tubular member to said conductive layer for applying said first high voltage to said tubular member and thereby avoiding disturbance to magnetic fields within said conical portion by said second high voltage applied to said lead wirev 5. A color picture tube according to claim 1, in which said electron gun means includes main focusing lens means having an optical center. means for generating said electron beams at spaced apart locations and for converging said beams to intersect each other at said optical center of the main focusing lens means so that at least some of said beams emerge from said main focusing lens means along divergent paths, and a pair of spaced apart first and second plates arranged along each of said divergent paths for deflecting the respec tive beam and whereby causing all ofthc beams to converge at a common area on said screen in response to the application of said first and second high voltages to said first and second plates, respectively.

6. in a color picture tube including an envelope hav ing a neck portion and a conical portion extending from said neck portion to a face plate having a screen thereon, and electron gun means disposed in said neck portion for directing and focusing a plurality of electron beams at said screen and requiring first and second high voltages of different values for the operation of said gun means which includes main focusing lens means having an optical center, means for generating said electron beams at spaced apart locations and for converging said beams to intersect each other at said optical center of the main focusing lens means so that at least some of said beams emerge from said main focusing lens means along divergent paths, and a pair of spaced apart first and second plates arranged along each of said divergent paths for deflecting the respective beam and thereby causing all of the beams to converge at a common area on said screen in response to the application of said first and second high voltages to said first and second plates, respectively; means for supplying said first and second high voltages to said gun means from within said conical portion ofthe envelope, comprising a conductive layer on the inner surface of said conical portion and at least the adjacent part of said neck portion and having said first high voltage applied thereto, at least one first contact member extend ing from said gun means and engageable with said conductive layer within said neck portion for receiving said first high voltage, a lead wire extending from within said conical portion toward said neck portion and receiving said second high voltage at the end of said lead wire remote from said neck portion, a second contact member connected with the other end of said lead wire and extending into said neck portion and being engageable with said gun means for applying said second high voltage thereto, a non-magnetic, conductive tubular member extending around and being insulated from said lead wire within said conical portion, and means electrically connecting said tubular member to said conductive layer for applying said first high voltage to said tubular member and thereby avoiding disturbance to magnetic fields within said conical portion by said second high voltage applied to said lead wire, and in which said second contact member is engageable with said second plate for applying said second high voltage directly thereto.

7. A color picture tube according to claim 6, in which said plurality of electron beams consists of a central beam which is generated at. and directed along the optical axis of said main focusing lens means so as to emerge from the latter along said optical axis, and two side beams generated at locations spaced from said central beam at opposite sides of the latter and emerging from said main focusing lens means along said divergent pakths which are respectively at opposite sides of said optical axis, and in which said first plate associated with each of said divergent pakths is disposed between the rcspective divergent path and said o tical axis and is electrically connected with said first plate associated with the other of said divergent paths so that said central beam passes undeflected between the first plates.

8. A color picture tube according to claim 6, in which said means for generating and for converging the beams, said main focusing lens means and said first and second plates constitute a unitary gun structure which is slidable into said neck portion for engaging said first contact member with said conductive layer and said second plate with said second contact member.

9. A color picture tube according to claim 8, in which said main focusing lens means includes a plurality of electrodes arranged successively in the direction of said axis, each said first plate is electrically connected with an adjacent one of said electrodes, and said first contact member extends from said one electrode for applying said first high voltage to said one electrode and, through the latter, to each said first plate.

10. A color picture tube according to claim 8. in which said means electrically connecting said tubular member to said conductive layer includes an arcuate spring member having said tubular member fixed thereto and closely engaging said conductive layer for securely positioning said lead wire and second contact member within said envelope.

H. A color picture tube according to claim 8, in which said second contact member is an elongated element of conductive, non'magnetic material secured, at one end, to said lead wire and having a reverted, bent portion at its other end for resilient engagement with said second plate.

12. A color picture tube according to claim 11, in which said second plate has a guide member thereon extending generally parallel to said axis and having an arcuate end portion engageable by said bent portion of the second contact member for guiding the latter into engagement with said second plate when said unitary structure of the gun means is inserted into said neck

Claims

1. In a color picture tube including an envelope having a neck portion and a conical portion extending from said neck portion to a face plate having a screen thereon, and electron gun means disposed in said neck portion for directing and focusing a plurality of electron beams at said screen and requiring first and second high voltages of different values for the operation of said gun means; means for supplying said first and second high voltages to said gun means from within said conical portion of the envelope, comprising a conductive layer on the inner surface of said conical portion and at least the adjacent part of said neck portion and having said first high voltage applied thereto, at least one first contact member extending from said gun means and engageable with said conductive layer within said neck portion for receiving said first high voltage, a lead wire extending from within said conical portion toward said neck portion and receiving said second high voltage at the end of said lead wire remote from said neck portion, a second contact member connected with the other end of said lead wire and extending into said neck portion and being engageable with said gun means for applying said second high voltage thereto, a non-magnetic, conductive tubular member extending around and being insulated from said lead wire within said conical portion, and means electrically connecting said tubular member to said conductive layer for applying said first high voltage to said tubular member and thereby avoiding disturbance to magnetic fields within said conical portion by said second high voltage applied to said lead wire.

2. A color picture tube according to claim 1, in which said means electrically connecting said tubular meMber to said conductive layer includes an arcuate spring member having said tubular member fixed thereto and closely engaging said conductive layer for securely positioning said lead wire and second contact member within said envelope.

3. A color picture tube according to claim 1, in which said second contact member is generally L-shaped with one arm thereof being secured to said lead wire and the other arm of said L-shaped contact member having a reverted bent end portion for resilient engagement with said gun means.

4. In a color picture tube including an envelope having a neck portion and a conical portion extending from said neck portion to a face plate having a screen thereon, and electron gun means disposed in said neck portion for directing and focusing a plurality of electron beams at said screen and requiring first and second high voltages of different values for the operation of said gun means; means for supplying said first and second high voltages to said gun means from within said conical portion of the envelope, comprising a conductive layer on the inner surface of said conical portion and at least the adjacent part of said neck portion and having said first high voltage applied thereto, at least one first contact member extending from said gun means and engageable with said conductive layer within said neck portion for receiving said first high voltage, a lead wire extending from within said conical portion toward said neck portion and receiving said second high voltage at the end of said lead wire remote from said neck portion, a generally L-shaped second contact member having one arm thereof secured to the other end of said lead wire and another arm extending into said neck portion and having a reverted bent end portion, and in which said gun means includes a guide member extending generally parallel to the axis of said neck portion and having an arcuate end portion resiliently engageable by said bent end portion of the second contact member for guiding the latter into engagement with said gun means when the latter is inserted into said neck portion and for applying said second high voltage to said gun means, a non-magnetic, conductive tubular member extending around and being insulated from said lead wire within said conical portion, and means electrically connecting said tubular member to said conductive layer for applying said first high voltage to said tubular member and thereby avoiding disturbance to magnetic fields within said conical portion by said second high voltage applied to said lead wire.

5. A color picture tube according to claim 1, in which said electron gun means includes main focusing lens means having an optical center, means for generating said electron beams at spaced apart locations and for converging said beams to intersect each other at said optical center of the main focusing lens means so that at least some of said beams emerge from said main focusing lens means along divergent paths, and a pair of spaced apart first and second plates arranged along each of said divergent paths for deflecting the respective beam and whereby causing all of the beams to converge at a common area on said screen in response to the application of said first and second high voltages to said first and second plates, respectively.

6. In a color picture tube including an envelope having a neck portion and a conical portion extending from said neck portion to a face plate having a screen thereon, and electron gun means disposed in said neck portion for directing and focusing a plurality of electron beams at said screen and requiring first and second high voltages of different values for the operation of said gun means which includes main focusing lens means having an optical center, means for generating said electron beams at spaced apart locations and for converging said beams to intersect each other at said optical center of the main focusing lens means so that at least some of said beams emerge from said main focusing lens means aLong divergent paths, and a pair of spaced apart first and second plates arranged along each of said divergent paths for deflecting the respective beam and thereby causing all of the beams to converge at a common area on said screen in response to the application of said first and second high voltages to said first and second plates, respectively; means for supplying said first and second high voltages to said gun means from within said conical portion of the envelope, comprising a conductive layer on the inner surface of said conical portion and at least the adjacent part of said neck portion and having said first high voltage applied thereto, at least one first contact member extending from said gun means and engageable with said conductive layer within said neck portion for receiving said first high voltage, a lead wire extending from within said conical portion toward said neck portion and receiving said second high voltage at the end of said lead wire remote from said neck portion, a second contact member connected with the other end of said lead wire and extending into said neck portion and being engageable with said gun means for applying said second high voltage thereto, a non-magnetic, conductive tubular member extending around and being insulated from said lead wire within said conical portion, and means electrically connecting said tubular member to said conductive layer for applying said first high voltage to said tubular member and thereby avoiding disturbance to magnetic fields within said conical portion by said second high voltage applied to said lead wire, and in which said second contact member is engageable with said second plate for applying said second high voltage directly thereto.

7. A color picture tube according to claim 6, in which said plurality of electron beams consists of a central beam which is generated at, and directed along the optical axis of said main focusing lens means so as to emerge from the latter along said optical axis, and two side beams generated at locations spaced from said central beam at opposite sides of the latter and emerging from said main focusing lens means along said divergent pakths which are respectively at opposite sides of said optical axis, and in which said first plate associated with each of said divergent pakths is disposed between the respective divergent path and said optical axis and is electrically connected with said first plate associated with the other of said divergent paths so that said central beam passes undeflected between the first plates.

10. A color picture tube according to claim 8, in which said means electrically connecting said tubular member to said conductive layer includes an arcuate spring member having said tubular member fixed thereto and closely engaging said conductive layer for securely positioning said lead wire and second contact member within said envelope.

11. A color picture tube according to claim 8, in which said second contact member is an elongated element of conductive, non-magnetic material secured, at one end, to said lead wire and having a reverted, bent portion at its other end for resilient engagement with said second plate.