JP3586340B2 - How to assemble a color CRT electron gun - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for assembling an electron gun for a color cathode-ray tube, and more particularly, to an electron gun for a color cathode-ray tube having at least an elliptical electrode including an elliptical cup-shaped electrode element and an elliptical plate-shaped electrode element. It relates to an assembling method.
[0002]
[Prior art]
Generally, an electron gun for a color cathode ray tube is assembled by using a plate-like electrode, a cup-like electrode, a cylindrical electrode having three electron beam passage holes formed therein, and an electrode in which these plate-like and cup-like electrode elements are appropriately combined. For example, a plurality of electrodes and a cathode holder for supporting a cathode are assembled into an assembling jig via a spacer, and the implanted portions provided on the electrodes and the cathode holder are pressed into a heat-softened insulating support. And assembled together.
[0003]
The assembling jig includes a lower reference base provided with a rod-shaped electrode position restrictor for regulating the positions of a plurality of electrodes, an upper reference base provided with a cathode holder position restrictor supporting a cathode holder, and an electrode. And a plurality of spacers for regulating the distance between the electrode and the cathode holder, and a pressure mechanism for pressing the electrode positioned and supported by the lower reference base and the cathode holder supported by the upper reference base.
[0004]
As an example of an electron gun assembling method performed by using such an assembling jig, FIG. 6 shows a configuration in which six electron beams including first to sixth grids G1 to G6 that emit three electron beams arranged in a line in the same plane. 2 shows the assembly of an electron gun with electrodes.
[0005]
To assemble the electron gun, the first to sixth grids G1 to G6 are provided to three electrode position regulators 2a to 2c provided in a row on the lower reference base 1 in the order of G6 → G1 and these electrodes G1 to G1. Spacers 3a to 3f are alternately incorporated with G6, and three cathode holders KHa to KHc are incorporated in three cathode holder restrictors 6a to 6c provided in a row on the upper reference base 5, respectively. After assembling the upper and lower reference tables 1 and 5, the first to sixth grids G1 to G6 and the cathode holder restrictors 6a to 6c incorporated in the upper and lower reference tables 1 and 5 are connected to a pressing mechanism (not shown). Pressure). At this time, the three electrode position regulators 2a to 2c and the cathode holder regulators 6a to 6c are respectively coaxially combined. After that, the implanted portions provided on the first to sixth grids G1 to G6 and the cathode holders Ka to Kc are pressed into a pair of insulating supports 8 which are heated to 1300 to 1400 ° C. by the gas burner and softened. , The first to sixth grids G1 to G6 and the cathode holders Ka to Kc are integrally fixed.
[0006]
By the way, regarding the color cathode ray tube, in order to improve the focus characteristic, the diameter of the electric field lens formed between the electrodes, especially the main lens which finally focuses the electron beam on the phosphor screen is increased to reduce the spherical aberration. Electron guns are widely used.
[0007]
As shown in FIG. 7, three electron beam passing holes 10a to 10c (only 10b and 10c are shown) through which three electron beams arranged in a row pass separately are formed as electrodes constituting such a large aperture lens. The three elliptical cup-shaped electrode elements 11 and the three elliptical cylindrical electrode elements 13 in which one electron beam passage hole 12 common to the three electron beams is formed. There is a cylindrical electrode formed by abutting via an elliptical plate-like electrode element 15 (correction electrode) in which electron beam passage holes 14a to 14c are formed.
[0008]
Conventionally, as a method of assembling an electron gun having such electrodes, the electrode elements are welded near the implanted portions of the electrode elements 11, 13, and 15 and provided on the long side of the cup-shaped electrode element 11. JP-A-5-20848 discloses a method for preventing the electrode from being elastically deformed during press-fitting by press-fitting the implanted portion 16 into an insulating support.
[0009]
However, in such a method, as shown in FIG. 8, a force is applied to the cup-shaped electrode element 11 in the direction of the arrow 17 for pushing the implanted portion 16 into the cup-shaped electrode element 11 at the time of press-fitting into the insulating support. Then, a deformation occurs in which the angle θ between the implanted portion 16 of the cup-shaped electrode element 11 and the long side portion is reduced. Simultaneously with this deformation, the plate-shaped electrode element 15 has a welding point 18 with the cup-shaped electrode element 11 as an action point, a bent portion 19 on the open end face side of the cup-shaped electrode element 11 as a fulcrum, and a central portion having a cylindrical shape. The deformation in the direction of the arrow 20 protruding toward the electrode element 13 is caused.
[0010]
When the electrode constituting the large-aperture lens is deformed in this way, the electric field of the large-aperture lens is disturbed by the deformation of the plate-shaped electrode element 15 in particular, and a desired focusing cannot be obtained. Imbalance of focusing and focusing in the horizontal and vertical directions occurs, greatly degrading the focusing performance of the large aperture main lens.
[0011]
[Problems to be solved by the invention]
As described above, conventionally, as electrodes constituting a large-diameter lens, an elliptical cup-shaped electrode element having three electron beam passage holes through which three electron beams arranged in a row pass separately, and three electron beams An elliptical cup-shaped electrode element having one common electron beam passage hole formed therein; and an elliptical plate-shaped electrode element having three electron beam passage holes formed therein for passing three electron beams separately. And there is an electrode formed in a cylindrical shape.
[0012]
As a method of assembling an electron gun having such electrodes, the above-described electrode elements are welded in the vicinity of the implanted portion, and the implanted portion provided on the long side portion of the cup-shaped electrode element is pressed into the insulating support. Thus, a method of preventing elastic deformation of the electrode at the time of press-fitting has been proposed.However, when an electron gun is assembled by such a method, at the time of press-fitting into the insulating support, the implanted portion is placed inside the cup-shaped electrode element. When a force in the pushing direction is applied, the cup-shaped electrode element is deformed so as to reduce the angle formed between the implanted portion and the long side portion, and at the same time, the center of the plate-shaped electrode element is moved toward the other cup-shaped electrode element. Causes deformation to protrude. As a result, the electric field of the large-aperture lens is disturbed, so that a desired focusing cannot be obtained. There is a problem of deterioration.
[0013]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and suppresses the deformation of a plate-like electrode element without significantly changing the structure of an electrode constituting a large-diameter lens, thereby improving the characteristics of a large-diameter lens. An object of the present invention is to provide a method for assembling an electron gun which does not impair the performance.
[0014]
[Means for Solving the Problems]
An oval cup-shaped electrode element formed with three electron beam passage holes through which at least three electron beams arranged in a row pass separately, or an ellipse formed with one electron beam passage hole common to three electron beams An assembling jig is formed by abutting the cup-shaped electrode element having a shape and the elliptical plate-shaped electrode element having the three or one electron beam passage hole formed thereon, with the other electrodes based on the electron beam passage hole. A method for assembling an electron gun for a color cathode-ray tube, in which the electrode elements are integrally welded, and then the implanted portion provided on the long side of the cup-shaped electrode element is pressed into the heat-softened insulating support and fixed. In the above, the welding of each electrode element was performed on the long diameter side portion orthogonal to the press-fit direction of the insulating support.
[0015]
Also, an elliptical cup-shaped electrode element in which three electron beam passage holes through which three electron beams arranged in a row pass separately is formed, and a length in which one electron beam passage hole common to three electron beams is formed. The circular cup-shaped electrode element is butt-joined via the above-mentioned three or one elliptical plate-shaped electrode element formed with one or more electron beam passage holes, together with other electrodes based on the electron beam passage hole. A collar for assembling in an assembling jig, welding each of the electrode elements integrally, and then press-fitting the implanted portion provided on the long side of the electrode element other than the plate-like electrode element into a heated and softened insulating support to fix it. In the method of assembling the electron gun for a cathode ray tube, welding of each electrode element is performed on a long diameter side portion orthogonal to the press-fit direction of the insulating support.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 shows an in-line type electron gun which emits three electron beams in one line according to one embodiment. This electron gun has three cathodes Ka 1 to Kc (only Ka is shown) arranged in a line, three cathode holders KHa, to KHc (only KHa is shown) respectively holding these cathodes Ka 1 to Kc, and the above-mentioned cathode Ka. To Kc, four electrodes consisting of first to fourth grids G1 to G4 sequentially arranged adjacent to the cathode holders KHa to KHc and the first to fourth grids G1 to G4 respectively. It is integrally fixed by a pair of insulating supports 8 via the provided planting part 15.
[0018]
Of the first to fourth grids G1 to G4, the first and second grids G1 and G2 are composed of elliptical plate-like electrodes, and the first and second grids G1 and G2 have three cathodes. Corresponding to Ka to Kc, three electron beam passage holes through which three electron beams arranged in one row pass separately are formed in one row.
[0019]
The third and fourth grids G3, G4 are formed by a pair of cylindrical electrodes G31, G32 and G41, G42, each of which is formed by abutting two oval cup-shaped electrode elements. It is formed in an oval cylindrical shape in which the elements G3P and G4P are arranged. On the end face of each of the cup-shaped electrode elements and on the plate-shaped electrode elements G3P and G4P, three electron beam passage holes through which three electron beams arranged in a row pass separately correspond to the three cathodes Ka to Kc. They are formed in a single row. The cup-shaped electrode elements and the plate-shaped electrode elements G3P and G4P of the third and fourth grids G3 and G4 are welded to adjacent electrode elements, respectively.
[0020]
H is a support for a heater (not shown) for heating the cathodes Ka, Kb, Kc separately.
[0021]
FIG. 2 shows an assembly jig used for assembling the electron gun. The assembling jig includes a lower reference table 30, an upper reference table 31, a pressing mechanism 32, and a plurality of plate-like spacers (not shown) for regulating an electrode interval.
[0022]
On the lower reference base 30, three stepped columnar electrode position regulators 35a to 35c for regulating the electrode position are provided in a row on the central portion of the base 34, and these electrode position regulators 35a to 35c are arranged in a line. A pair of columnar outer restrictors 36a and 36b is provided on both sides in the arrangement direction of 35c.
[0023]
On the other hand, the upper reference base 31 slidably penetrates the center of the base 37 that engages with the tips of the pair of outer restrictors 36a and 36b of the lower reference base 30, and the upper reference base 31 When engaged with the lower reference base 30, three columnar cathode holder regulators 38a to 38c are provided coaxially with the distal ends of the electrode position regulators 35a to 35c of the lower reference base 30. .
[0024]
The pressurizing mechanism 32 includes three coil springs 40 separately mounted around the respective cathode holder restrictors 38 a to 38 c of the upper reference base 31, and each of the cathode holder restrictors via the coil springs 40. The slider 41 includes a slider 41 pressing the sliders 38 a to 38 c, a pair of guide columns 42 fixed to the base 37 of the upper reference base 31 and guiding the pressing of the slider 41, and a weight 43 attached to the slider 41. .
[0025]
As shown in FIG. 3, the assembling of the electron gun is performed by firstly applying the first to fourth grids G1 to G4 to the three electrode position regulators 35a to 35c of the lower reference base 30 in the order of G4 → G1, and Spacers 45a to 45d are incorporated alternately with the grids G1 to G4. In this case, as for the third and fourth grids G3 and G4 composed of a plurality of electrode elements, the electrode elements are assembled as they are without welding and integrating the electrode elements. On the other hand, the cathode holders KHa to KHc are incorporated into the three cathode holder restrictors 38a to 38c of the upper reference base 31, respectively.
[0026]
Then, the base of the upper reference base 31 is engaged with a pair of outer restrictors of the lower reference base 30, and these upper and lower reference bases 30, 31 are combined. The first to fourth grids G1 to G4 and the cathode holders KHa to KHc incorporated in 31 are pressed in the axial directions of the electrode position regulators 35a to 35c and the cathode holder regulators 38a to 38c coaxially engaged. Thereafter, the electrode elements of the third and fourth grids G3 and G4 incorporated as they are are welded and integrated. In this case, in particular, for the plate-shaped electrode element G4P located on the third grid G3 side of the fourth grid G4 and the two cup-shaped electrode elements abutted via the plate-shaped electrode element G4P, an implant portion is provided. The long sides of the electrode elements are welded and integrated at the long diameter side without welding.
[0027]
Next, the implanted portions provided on each of the grids G1 to G4 and the cathode holders KHa to KHc are pressed into the insulating support 8 made of a pair of glass softened by being heated to 1300 to 1400 ° C. by a gas burner. Thus, the grids G1 to G4 and the cathode holders KHa to KHc are integrally fixed. After the insulating support 8 is cooled and solidified, the upper and lower reference bases 30 and 31 are separated, and the grids G1 to G4 and the cathode holders KHa to KHc, which are integrally fixed by the insulating support 8, are removed together with the spacers 45a to 45d. Take it out. Thereafter, the spacers 45a to 45d are removed from the grids G1 to G4 and the cathode holders KHa to KHc, which are integrally fixed by the insulating support 8.
[0028]
Conventionally, assembling the electron gun as described above has occurred when assembling an electron gun that forms a large-diameter lens using a cylindrical electrode in which two cup-shaped electrode elements are abutted via a plate-shaped electrode. Deformation of the plate-shaped electrode element can be prevented, and deterioration of the focus characteristics of the electron gun forming the large-diameter lens can be prevented.
[0029]
That is, as shown in FIG. 4, the cylindrical electrode G41 of the fourth grid G4 forming the large-diameter lens is formed by a plate-shaped electrode element 48 having one electron beam passage hole common to three electron beams. An implant 16 is provided on the long side of the cup-shaped electrode 49 in which three electron beam passage holes through which three electron beams facing each other via the electrode element G4P pass separately are formed. When assembling an electron gun using such an electrode element, welding is performed as shown by a welding point 51 on the long diameter direction side portion orthogonal to the press-fitting direction of the implanted portion 16 with respect to the heat-softened insulating support, as shown in FIG. As shown in (2), at the time of press-fitting into the insulating support, a force is applied to the cup-shaped electrode element 49 in the direction of the arrow 52 to push the implanted portion 16 into the inside of the cup-shaped electrode element 49, and the cup-shaped electrode element 49 is implanted. Even if a deformation that reduces the angle θ between the portion 16 and the long side portion occurs, since the cup-shaped electrode element 49 and the plate-shaped electrode element G4P are welded at the long diameter side, the plate-shaped electrode element G4P is There is no deformation. Therefore, by assembling the electron gun as described above, it is possible to prevent the focus characteristics of the electron gun forming the large aperture lens from deteriorating.
[0030]
In the above embodiment, the assembling of an electron gun in which a large-diameter lens is formed using a cylindrical electrode formed by abutting two cup-shaped electrode elements via a plate-shaped electrode element has been described. Has an elliptical cup-shaped electrode element formed with three electron beam passage holes through which at least three electron beams arranged in a row pass separately, or one electron beam passage hole common to three electron beams. The present invention is applied to assembling of an electron gun having a cylindrical electrode in which an elliptical cup-shaped electrode element and an elliptical plate-shaped electrode element having three or one electron beam passage holes are abutted. The same effect can be obtained.
[0031]
【The invention's effect】
An oval cup-shaped electrode element formed with three electron beam passage holes through which at least three electron beams arranged in a row pass separately, or an ellipse formed with one electron beam passage hole common to three electron beams An assembling jig is formed by abutting the cup-shaped electrode element having a shape and the elliptical plate-shaped electrode element having the three or one electron beam passage hole formed thereon, with the other electrodes based on the electron beam passage hole. A method for assembling an electron gun for a color cathode-ray tube, in which the electrode elements are integrally welded, and then the implanted portion provided on the long side of the cup-shaped electrode element is pressed into the heat-softened insulating support and fixed. Or, an elliptical cup-shaped electrode element in which three electron beam passage holes through which three electron beams arranged in a row pass separately is formed, and one electron beam passage hole common to the three electron beams. Oval shape The cup-shaped electrode element is butt-joined via the above-mentioned three or one elliptical plate-shaped electrode element in which the electron beam passage hole is formed. After the electrode elements are integrally welded, the implanted part provided on the long side of the electrode element other than the plate-shaped electrode element is press-fitted into a heat-softened insulating support and fixed. In the gun assembling method, when welding of the electrode element is performed on the long diameter side of the electrode element orthogonal to the press-fitting direction of the insulating support, the force in the press-fitting direction of the implanted portion of the implanted part to the insulating support is applied to the plate-like electrode element. The electron gun can be assembled without giving it, and an electron gun having predetermined characteristics can be assembled.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an electron gun according to an embodiment of the present invention.
FIG. 2 is a view showing a configuration of an assembly jig used for assembling the electron gun.
FIGS. 3A and 3B are diagrams for explaining a method of assembling the electron gun according to an embodiment of the present invention.
4 (a) is a plan view showing the configuration of an electrode constituting a fourth grid of the electron gun, FIG. 4 (b) is a partially cutaway front view, and FIG. 4 (c) is It is a side view.
FIGS. 5 (a) and 5 (b) are diagrams for explaining deformation of electrodes constituting the fourth grid, which occur when assembling the electron gun.
FIGS. 6A and 6B are diagrams for explaining a conventional method of assembling an electron gun.
7 (a) is a plan view showing a configuration of an electrode forming a conventional large-diameter lens, FIG. 7 (b) is a partially cutaway front view, and FIG. 7 (c) is a side view. It is.
8 (a) and 8 (b) are diagrams for explaining deformation of electrodes forming the large-diameter lens, which occur when assembling the conventional electron gun.
[Explanation of symbols]
8 Insulating support 16 Planting part 48 Cup-shaped electrode element 49 Cup-shaped electrode element G1 First grid G2 Second grid G3 Third grid G4 Fourth grid G4P Plate-shaped electrode element

Claims (2)

An oval cup-shaped electrode element formed with three electron beam passage holes through which at least three electron beams arranged in a row pass separately, or an ellipse formed with one electron beam passage hole common to three electron beams An assembling jig is formed by abutting the cup-shaped electrode element having a shape and the elliptical plate-shaped electrode element having the three or one electron beam passage hole formed thereon, with the other electrodes based on the electron beam passage hole. After the electrode elements are integrally welded, an electron gun for a color cathode ray tube in which the implanted portion provided on the long side of the cup-shaped electrode element is press-fitted into a heat-softened insulating support and fixed. In the method,
A method for assembling an electron gun for a color cathode-ray tube, characterized in that the electrode elements are welded on a long diameter side portion orthogonal to a press-fit direction of the insulating support. An oval cup-shaped electrode element formed with three electron beam passage holes through which three electron beams arranged in a row pass separately, and an oval shape formed with one electron beam passage hole common to three electron beams Is assembled with the cup-shaped electrode element through the above-mentioned three or one elliptical plate-shaped electrode element in which the electron beam passage hole is formed. Color cathode-ray tube that is assembled into a tool, and the above-mentioned electrode elements are welded together, and then the implanted portion provided on the long side of the electrode element other than the above-mentioned plate-like electrode element is pressed into the heat-softened insulating support and fixed. The method of assembling the electron gun for
A method for assembling an electron gun for a color cathode-ray tube, characterized in that the electrode elements are welded on a long diameter side portion orthogonal to a press-fit direction of the insulating support.

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