CN1051639C

CN1051639C - Convergence yoke of cathode ray tube

Info

Publication number: CN1051639C
Application number: CN95109194A
Authority: CN
Inventors: 林钟皓
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 1994-07-07
Filing date: 1995-07-07
Publication date: 2000-04-19
Anticipated expiration: 2015-07-07
Also published as: KR960005716A; CN1121637A; KR970008568B1; TW270999B

Abstract

The present invention relates to an assembling system that is arranged at the back of a deflecting system of a cathode ray tube and used for deflecting the initial position of the electric beam. The assembling system comprises a magnetic core with the shape of a round ring, a plurality of magnetic pole parts, a bracket that is used for combining each magnetic pole part on the inner cycle of the magnetic core to make the magnetic pole parts connected with the magnetic core.

Description

The convergence yoke of cathode ray tube

The present invention relates to a kind of cathode ray tube, particularly a kind of convergence yoke of deflection system rear portion of the cathode ray tube that is installed in the deflection beam initial position.

Generally speaking, the cathode ray tube that is used for television receiver and various monitors reappears a width of cloth chromatic image with picture intelligence (luminance signal and chrominance signal) irradiation red, green, blue look fluorescent material.Its structure as shown in Figure 1.Its profile has a plane 1 and its rear portion to have the funnel shaped part 3 of a neck 2 to be combined into an integral body as a sphere.Electron gun 4 is installed in the neck 2, is used to launch the red, green, blue three-color electron beam.Deflection system 5 is installed on the excircle of neck 2 of funnel shaped part 3, is used for the electron beam of launching from electron gun 4 at vertical and horizontal direction upper deflecting.The framework 6 of 1 inside, plane is supported by a plurality of support springs 7.The shadow mask 8 that forms in 1 zone, plane of funnel shaped part 3 has many apertures, so that the electron beam of launching from electron gun 4 is passed through.The inner shield 9 that forms in the zone of the funnel shaped part 3 of framework 6 is to be used for preventing because the electron gun 4 electrons emitted beam path deflections that ground magnetic action or leakage field effect cause.Fluorescent material 10 is coated on the inner surface on plane 1, produces image when the electron beam that passes shadow mask 8 clashes into thereon.

When the electron beam 4 in the neck 2 of funnel shaped part 3 applied high voltage, electron gun was encouraged, and launches three-color electron beam.The magnetic field of deflection system 5 that is installed in the neck 2 excircle front portions of funnel shaped part 3 makes the electron beam of launching at vertical and horizontal direction upper deflecting.At this moment, the inner shield of the framework in funnel shaped part 3 zones 9 protections three-color electron beam that be deflected and that advancing avoids being subjected to the influence of ground magnetic action or leakage field effect, makes their path can deflection.

The electron beam that part is launched from electron gun 4 passes the hole of shadow mask 8, impinges upon on the fluorescent material 10 that is coated on plane 1 inner surface, and the result reappears the chromatic image that a width of cloth is combined by three-color electron beam.By the decision of each colour signal, the predetermined amount of each electron beam makes the reproduction of image become possibility.

When work, because the shadow mask 8 that heat causes in the pipe expands, the situation that electron beam can not be aimed at the precalculated position may take place.Aforesaid electron beam can not carry out the ratio of appropriate combination in the precalculated position and represent (with reference to figure 2) by an amount that is called as misconvergence.

As shown in the table, existing cathode ray tube is allowed to the misconvergence and the consequent electron beam deflection of part.The reason that allows the misconvergence shown in the table is owing to cause in the magnetic field that will deal with deflection system 5 formation.(zone shown in A, B, C, the D representative graph 2) table

Owing to partly allow electron beam deflection, result that the whole image that is formed by electron beam is had nothing in common with each other, this also is the bad main cause of image definition.

Owing to require the trend of high definition to increase sharply to industrial color cathode ray tube (monitor), the deflection system that therefore can form uniform magnetic field has been used to prevent the electron beam deflection and has improved image definition in recent years.A kind of deflection system convergence yoke afterwards that is installed in changes to the initial position from electron gun 4 electrons emitted bundles on the position that needs.Convergence yoke can obtain needed convergence situation as a result.

Shown in Fig. 3 A to 3C, existing convergence yoke with above-mentioned functions comprises: have a plurality of magnetic cores 11 that become as a whole protrusion member 11a with it on inner periphery, coil 12 and be embedded in coil pipe 13 on the protrusion member 11a of each magnetic core respectively, and a support 14 that is used for the magnetic core 11 that has coil pipe 13 is installed in deflection system 5 rear portions.

The quantity of protrusion member 11a (magnetic pole) on magnetic core 11 inner peripherys should form the quantity in magnetic field as required and change, and this quantity generally is four utmost points, the sextupole and the ends of the earth.

Below introduce the method that assembling has the convergence yoke of said structure.At first, after winding coil 12 on the excircle of coil pipe 13, the coil pipe 13 that is wound with coil is embedded on the protrusion member 11a that is formed on magnetic core 11 inner peripherys.Then, the magnetic core 11 that has coil pipe 13 is coupled in the support 14 that is attached at after the deflection system 5.

Use the above-mentioned convergence yoke that assembles to realize dynamic convergence (convergence of controlling electron beam is come in the position of the image that will generate according to electron beam) in a frame.Under the situation of usage level deflection current or vertical yoke current operation convergence yoke, should consider that horizontal yoke current is high-frequency current (be 15.75KHz in the television receiver, the frequency in the industry monitoring device more is higher than this).In other words, under the situation of usage level deflection current, consider the problem that the heat of generation causes, should use highly-resistant material, Ferrite Material for example is as magnetic circuit element.

Shown in Fig. 5 A and 5B, assemble for control, according to different situations, need a plurality of magnetic fields of various arrangements.According to this requirement, need and form this a plurality of field poles.That is, need to form four magnetic fields with four utmost points, sextupole forms six magnetic fields and the ends of the earth forms eight magnetic fields.Accompanying drawing has shown the example in the various magnetic fields of using four utmost points and sextupole formation.Ends of the earth situation similarly.

By a kind of convergence form of uniform magnetic field generation,, be that over convergence (with reference to figure 2) is arranged on all the other the whole positions except the display screen middle body.Because this situation, (on a left side or right side) shows the red, green, blue look in order in the neighboring of display screen.In this case, at first those are assembled with being synchronized with horizontal signal, proofread and correct in four magnetic fields that 45 degree positions form.May there be red situation of separating with green beam at the edge of display screen with blue beam.Those misconvergences usefulness are synchronized with horizontal signal in this case, four magnetic field correction that form in 90 degree positions.

Under the non-uniform magnetic-field situation, high-quality cathode ray tube need be proofreaied and correct owing to assemble misconvergence improper or that tolerance causes with convergence yoke, and these tolerances may result from manufacture process, or come from the design tolerance of assembling and deflection system 5.At this moment, as use four or six magnetic poles, following effect is arranged.The first, can be compensated owing to using barrel-shaped horizontal magnetic field or aciculiform vertical magnetic field to proofread and correct the formed misconvergence of astigmatism that auto-convergence brings.The second, the scanning area distortion that increases owing to these magnetic fields can be compensated.The 3rd, the misconvergence that a part can not be proofreaied and correct can be compensated.

Yet there is following problem in existing convergence yoke.

At first,, and be embedded in that coil pipe one by one on each protrusion member constitutes, therefore need a large amount of parts, manufacturing cost height, component-assembled difficulty because magnetic pole is by being wound with coil on it.

Secondly, when the assembling convergence yoke, owing to only can use those magnetic cores that have with required number of magnetic poles similar number protrusion member, so the versatility of magnetic core is restricted.

Provide a kind of convergence yoke can finish the purpose of the present invention that designs for addressing the above problem with cathode ray tube of versatility and simple structure.

For finishing these and other purposes of the present invention and feature, a kind of convergence yoke of cathode ray tube is provided, comprising: the magnetic core of an annular; A plurality of pole piece; Be used for each pole piece is incorporated on the magnetic core so that the support that pole piece is connected with magnetic core with one, described support comprises a plurality of support components that support pole piece in conjunction with magnetic core and pole piece the time, wherein, described support is incorporated into each pole piece on the inner periphery of magnetic core, described support component is a ribs, described ribs is formed on the outside of described support inner edge, makes described ribs support described pole piece.

Fig. 1 is the profile of a cathode ray tube as a reference.

Misconvergence when Fig. 2 shows cathode ray tube work.

Fig. 3 A to 3 (be the plane graph of existing four utmost point convergence yokes, wherein:

Fig. 3 A has only shown a magnetic core,

Fig. 3 B shown on it in conjunction with the magnetic core that is wound with the coil pipe of coil,

Fig. 3 C has shown the magnetic core that is combined on the support and has had the coil pipe of coil.

Fig. 4 is an existing convergence yoke perspective views of supports according.

Fig. 5 A and 5B are that reading beam relies on the polarity that has convergence yoke now and the schematic diagram of the state that moves, wherein:

Fig. 5 A has shown the motion state of existing four utmost point convergence yokes.

Fig. 5 B has shown the motion state of existing sextupole convergence yoke.

Fig. 6 A to 6C is the plane graph that shows the present invention's four utmost point convergence yokes, wherein:

Fig. 6 A has only shown a magnetic core,

Fig. 6 B has shown makes being connected of magnetic core and the protrusion member that is wound with coil,

Fig. 6 C has shown that the magnetic core that is connected with protrusion member is incorporated into a support that is used for installing on cathode ray tube.

Fig. 7 is the perspective views of supports according of a convergence yoke of the present invention.

The present invention will be described below with reference to Fig. 6 A to 6C that shows a preferred embodiment of the present invention.

Convergence yoke according to a preferred embodiment of the present invention comprises: the magnetic core 21 of an annular, a plurality of pole piece 23, be wound with coil 22 on each, with a support 24, the magnetic pole 23 that is used for each being wound with on it coil is attached to the inner periphery of magnetic core 21, so that pole piece 23 is connected with magnetic core 21.Support 24 comprises a plurality of integrated support rib 24a that are positioned at support 24 inside.When with support 24 pole piece 23 being incorporated into magnetic core 21, ribs 24a supports pole piece 23.

The internal diameter A of support outer rim 24c equates with the external diameter of magnetic core 21.The equal diameters of the external diameter B of support inner edge 24b and the circumference that constitutes by pole piece 23.

Although present embodiment has only shown the situation of using four or eight pole piece 23, the quantity of the ribs 24a of pole piece and support pole piece can change as required.

Though present embodiment uses ribs 24a to support pole piece 23, ribs 24a can substitute with support slot or binding agent.

Below the assemble method of convergence yoke of the present invention with said structure is described.

At first, coil 22 around each independently on the pole piece 23.The pole piece 23 of the number of poles that meets the demands is embedded on the ribs 24a on the excircle that is formed at support 24 inner edges, makes ribs 24a support pole piece 23.Then, when being embedded into the magnetic core 21 of annular in the support 24, magnetic core 21 and pole piece 23 are combined by support 24.The reason that supports pole piece 23 with ribs 24a is because when finishing, each in the required number pole piece 23 of embedding all will with other pole piece with fixed angle separately.Magnetic core that so combines and pole piece 23 are installed in the back of deflection system 5 with support 24.

Convergence yoke of the present invention has the following advantages.

At first owing to no longer need normally used coil pipe, required parts have reduced, and therefore reduced manufacturing cost, but the workability of assembling also have improvement.

Next is owing to use magnetic core in the assembling process of convergence yoke needn't be considered required number of magnet poles, so magnetic core can use in all cases.

Although be that the present invention will be described in conjunction with special embodiment, above-mentioned to one skilled in the art explanation obviously can have many substituting and change.Therefore the present invention will comprise that all substitute and change within these spirit and scope.

Claims

1, a kind of convergence yoke of cathode ray tube comprises:

The magnetic core of an annular;

A plurality of pole piece; With

One is used for each pole piece is incorporated on the magnetic core so that the support that pole piece is connected with magnetic core, and described support comprises a plurality of support components that support pole piece in conjunction with magnetic core and pole piece the time, it is characterized in that,

Described support is incorporated into each pole piece on the inner periphery of magnetic core, and described support component is a ribs, and described ribs is formed on the outside of described support inner edge, makes described ribs support described pole piece.