CN1051640A - A kind of color cathode ray tube - Google Patents

Abstract

A kind of the color cathode ray tube of deflection system that a parallel electron gun and a design produce even magnetic deflection field is housed, this parallel electron gun has the focus mask of adorning three pole piece magnets, and a magnetic field generator is contained in the outside of cathode ray tube so that pole piece is applied 4 utmost point dynamic magnetic fields, and constituting one thus can be to any dynamic focusing system of proofreading and correct of dispersing of three electron-beam in vertical direction or the horizontal direction.

Description

A kind of color cathode ray tube

The present invention generally speaking relates to a kind of color cathode ray tube, specifically a kind of color cathode ray tube of being furnished with a parallel electron gun and a pair of deflection system.Wherein, deflection system is designed to produce even magnetic deflection field, thereby constitutes a kind of dynamic focusing system that can proofread and correct dispersing of three-beam electron-beam in vertical direction or horizontal direction.

Usually, the deflection system that is used to be furnished with the color cathode ray tube of parallel electron gun produces a pincushion shape horizontal deflection magnetic field and a barrel-shaped vertical deflection magnetic field.The advantage of such deflection system has been to exempt uses focusing system to proofread and correct necessity of skew, thereby also need not complicated focus circuit.But non-homogeneous magnetic deflection field makes the distortion owing to deflection of bundle point probably; And can't obtain high resolution, especially in the edge of image zone.

Know, in the cathode ray tube that has the triangular form electron gun, used the deflection system that can produce uniform magnetic field.In order to overcome the problem of pointing out above, when same method is used to have the color cathode ray tube of parallel electron gun, should be equipped with a kind of like this deflection system to constitute the dynamic focusing system that an energy is proofreaied and correct dispersing of three-beam electron-beam.

With reference to Fig. 5, disclosed a kind of color cathode ray tube in the open communique of Japan special permission 64-62993 number, a focus pack 1 being housed, a pair of magnetic field generator staggered relatively 2 and 3 have been installed in the periphery of this cathode ray tube neck 4 as on the anode termination of last accelerating grid electrode.Focus pack 1 comprises two couples of pole piece 7a in the cup-shaped housing that is contained in a nonmagnetic metal, 7b and 8a, and 8b, pole piece 7a, 7b and 8a, 8b places in pairs, so that electron beam path 5 and 6 just in time is between every pair of pole piece.In addition, the path 9 of central beam is placed between a pair of barricade 9a and the 9b. Magnetic field generator 2 and 3 is magnetic core 2a and the 3a by U-shaped, and the outside is being twined coil 2b and 3b and constituted, and be supported make them shank respectively with pole piece 7a and 7b and 8a, the outer end magnetic communication of 8b.

Dynamic focusing correction is realized that by parabolical electric current or any other zigzag wave dynamic current of propagating by coil 2b and 3b dynamic current becomes with electron beam deflecting degree increases greatlyly and proportionally here.Since from the shank of magnetic core 2a and 3a to pole piece 7a, 7b and 8a, the dipolar magnetic field that 8b produced makes electron beam deflection in opposite direction, shown in big arrow 10A and 10b.

The advantage of dynamic focusing correction is that magnetic field for correcting is strengthened by two pairs of pole pieces, thereby guarantees to have highly sensitive optimum focusing calibration result.Its shortcoming is that dynamic focusing correction can only work in the horizontal direction, and can not work at vertical and horizontal both direction simultaneously.

Color cathode ray tube of the present invention, overcome the shortcoming and defect part that exists in above-mentioned and many other prior arts, it comprises a parallel electron gun, one can produce uniform magnetic field, so that utilize dynamic focusing system to come the deflection system that dispersing of three electron-beam proofreaied and correct.Wherein parallel shape electron gun has an ellipse garden shape hollow body focus mask, and this hollow body has the major axis of level and vertical minor axis.This focus mask is equipped with three pole pieces, and first pole piece is rectangular, is made by magnetic material, and it is centered close to the middle section of ellipse garden hollow body, so that surround the path of center electron beam.The second and the 3rd pole piece lays respectively at the first pole piece left and right sides and separates with it, to form the second avris electron beam path and the 3rd avris electron beam path betwixt.Second all has open and flat and parallel with first pole piece medial surface and one and the similar curved exterior surface of curved surface of the ellipse garden hollow body of focus mask with the 3rd pole piece.Magnetic field generator arranges that around the cathode ray tube neck magnetic field generator includes an annular core element with four magnetic poles, is wound with coil on each magnetic pole.Annular core element around the ray tube neck has two magnetic poles to lay respectively at the radially relative position of the first pole piece top and bottom, two other magnetic pole then radially is positioned at second position relative with the 3rd pole piece outside, so just makes dynamic current to flow by coil.

In a preferred embodiment, the second and the 3rd pole piece is the hemisphere hollow shape, has a hemispherical top and an open and flat bottom.

In a preferred embodiment, the second and the 3rd pole piece is parallel to two sides of the first rectangle pole piece respectively with its open and flat bottom.

So, the present invention make following and become possibility: (1) provides a kind of and uses common focus pack just can not reduce the horizontal dynamic convergence correction performance and effectively carry out the color cathode ray tube of vertical dynamic convergence correction.(2) provide a kind of electron gun length of need not elongating just can make the image of whole screen have high-resolution color cathode ray tube.

With reference to following accompanying drawing, can better understand the present invention, and the people that this area is familiar with will know better its each purpose and advantage.

Fig. 1 is the vertical side view of color cathode ray tube major part of the present invention.

Fig. 2 is for showing the perspective view of position relation between focus mask and the first, the second and the 3rd magnetic pole.

Fig. 3 and Fig. 4 are the schematic diagrames in the magnetic field that shows, the horizontal cross-section of cathode ray tube of the present invention.

Fig. 5 is the color cathode ray tube in the prior art, is presented on the schematic diagram in the magnetic field on the horizontal cross-section.

With reference to Fig. 1, the color cathode ray tube of glass is equipped with a parallel electron gun 11 at its neck 4.Electron gun 11 comprises three negative electrode 12a, 12b and 12c, control 14, one focus masks 15 of 13, one accelerating grid electrodes of grid and an anode 16 that serves as last accelerating grid electrode.Focus mask 15 and anode 16 have columniform metal shell, the vertical axial length of its trunnion axis.The anode head is equipped with focus pack 1, and it has and same structure shown in Figure 5.More particularly, focus pack 1 has two couples of pole piece 7a, 7b and 8a, 8b, the two pairs of bipolar field generators 2 and 3 are around neck 4 peripheries location and installation relatively, owing to twining coil 2a and 2b on the shank of U-shaped core body 2 and 3, make magnetic field generator and pole piece 7a, 7b and 8a, 8b magnetic links to each other.

As Fig. 2 as shown in Figure 3, the focus mask 15 of nonmagnetic metal system has a hollow body, and this hollow body cross section is oval, and the major axis of level and vertical minor axis are arranged, and there are three pole pieces 17,21 and 22 in inside.First pole piece 17 is cuboids, make with magnetic material, place the center of gate body and surround an electron beam channel 18, the second and the 3rd pole piece 21,22 place the both sides of first pole piece 17, and pole piece 21 and 22 is hemisphere, and the bottom of curved top portion peace is arranged, their flat bottoms is parallel with first pole piece 17 that is positioned at the center respectively, as shown in Figure 3.The electron beam path 19,20 of both sides lays respectively at first pole piece 17 and second pole piece 21, and between first pole piece 17 and the 3rd pole piece 22.

As shown in Figure 3, magnetic field generator 23 is around the placed around of neck 4.Magnetic field generator comprises four magnetic pole core bodys 24 of a ring-type, make by ferrite, four magnetic pole 24a, 24b, 24c, 24d each around line chart 25a, 25b, 25c and 25d.In addition, magnetic pole 24c and 24d also are equipped with another coil 25e and 25f.Magnetic pole 24a links to each other with bottom magnetic with the top of first pole piece 17 respectively with 24b, and magnetic pole 24c and 24d link to each other with the outside magnetic of pole piece 21 and 22 flat bottoms respectively.In Fig. 1, magnetic field generator 2(3) and in 23 in the heart be made as 0.5 times of the neck inside diameter D or bigger in advance apart from the people, in order to avoid each magnetic field generator 2,3 and 23 magnetic fields that produced are interfered with each other.

In above-mentioned device, when four pole reductions were worked, dynamic current flowed to 25d by coil 25a, make magnetic pole 24a24b become positive pole, and magnetic pole 24c and 24d becomes negative pole, thereby produced dynamic focusing.As a result, in focus mask 15, the magnetic direction that is produced is just shown in chain-dotted line among Fig. 3, and the electron beam that forces both sides vertical deflection in the opposite direction, as big arrow direction among the figure.Simultaneously, center electron beam is lived by pole piece 17 shieldings and is separated with magnetic field.

When bipolar correction is worked, just make dynamic current flow through coil 25e and 25f, so or magnetic pole 24c or 24d becomes negative pole, and all the other magnetic poles become positive pole, thereby in focus mask 15, produce a magnetic field, as a result, impel the electron beam deflection up or down of both sides, direction shown in big arrow.

Be that with the remarkable difference of prior art the present invention is not weakening under the horizontal dynamic focusing ability prerequisite by common focus pack, just can carry out vertical dynamic focus simultaneously.In addition, need not to elongate the length of electron gun, just can on whole screen, obtain high-resolution image.

Obviously, under the prerequisite that does not deviate from scope and spirit of the present invention, those skilled in the art is got on very well, various other improvement are conspicuous.So the scope that does not mean that the dependent claims here just is confined to the scope that illustrates here, and should comprise all features with novelty involved in the present invention, comprise promising those skilled in the art think the feature of equivalent.

Claims (3)

1, a kind of color cathode ray tube comprises a parallel electron gun; One can produce uniform magnetic field so that the deflection system of being come by dynamic focusing system dispersing of three electron-beam proofreaied and correct; Wherein, parallel electron gun comprises a focus mask, this focus mask is an oval hollow body that horizontal long axis and vertical short axis are arranged, this focus mask is equipped with three pole pieces, first pole piece is a cuboid by magnetic material system, be positioned the central authorities of oval hollow body, to surround the center electron beam path, the second and the 3rd pole piece is about first pole piece and with it separately to form the second wing electron beam channel and the 3rd wing electron beam channel between them, second respectively has an open and flat medial surface parallel with first pole piece and one and the similarly crooked outer surface of curved surface of the oval hollow body of focus mask with the 3rd pole piece; Magnetic field generator is arranged around the neck of cathode ray tube, this magnetic field generator comprises a toroidal core, it has four each utmost points around coil, locate vis-a-vis by the end of first pole piece and top side round neck along diameter for toroidal core, and other the two poles of the earth are facing to the location, side of the second and the 3rd pole piece, so dynamic current is flowed by coil.

2, according to the color cathode ray tube of claim 1, second pole piece and the 3rd pole piece hollow body wherein with half garden shape, this hollow body has a semi-circular top and a flat bottoms.

3, according to the color cathode ray tube of claim 1, the wherein flat bottoms of second pole piece and the 3rd pole piece and the parallel installation in the opposite flank of the first rectangle pole piece.

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