KR19990027360A - Cathode of electron gun for cathode ray tube and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a cathode for radiating an electron beam when driving a cathode ray tube in a cathode ray tube electron gun, and a method of manufacturing the same. The sleeve and the ribbon are integrally formed so as to facilitate the production of the cathode and at the same time, the heat is generated during operation of the cathode. Or to prevent the ribbon from deforming.

To this end, the ribbon 23 is integrally formed on the outer circumferential surface of the sleeve 20 to allow the upper end of the ribbon integrally formed with the sleeve to be fixed to the upper surface of the holder 24 in consideration of the length of the ribbon 23. 26), pressing the prepared cylindrical material to form a plurality of ribbons (23) integrally with the sleeve 20 and the bottom, and bending the ribbon formed on the lower portion of the sleeve up; Outwardly bending the remaining portion except the overlapping portion (L) in the plurality of ribbons bent upward, and the upper end of the outwardly bent ribbon 23 is welded fixed to the upper surface of the holder (24).

Description

Cathode of electron gun for cathode ray tube and manufacturing method thereof

The present invention relates to an electron gun for a cathode ray tube, and more particularly to a cathode for emitting an electron beam when driving the cathode ray tube and a method of manufacturing the same.

FIG. 1 is a cross-sectional view showing a general color cathode ray tube, in which red, green, and blue phosphors are applied to an inner surface of a panel 1 to form a fluorescent surface 2, and a neck portion 3a behind the panel 1. The funnel 3, in which the electron gun 4 is enclosed, is fused by glass to maintain a high vacuum of about 10 ^-7 Torr.

The shadow mask 6, which serves as color screening of the electron beam 5 emitted from the electron gun 4, is installed on the support frame 7 at a portion adjacent to the fluorescent surface 2 of the inner surface of the panel 1. The outer peripheral surface of the funnel is provided with a deflection yoke 8 for deflecting the electron beam emitted from the electron gun in the horizontal and vertical directions.

FIG. 2 is a side view of the electron gun applied to FIG. 1, in which the electrodes of the color cathode ray tube electron gun can reach the fluorescent surface 2 by controlling the electron beam 5 emitted from the three cathodes 9 in a constant intensity form. In order to ensure that the electron beam 5 is perpendicular to the path through which the electron beam 5 passes, they are arranged in-line at regular intervals.

The electron gun 4 includes three cathodes 9 horizontally arranged side by side independently from each other, a first grid electrode 10 arranged to maintain a predetermined distance from the cathode to control the amount of hot electrons generated from the cathode, A second grid electrode 11 arranged to maintain a predetermined distance from the first grid electrode to accelerate and draw out hot electrons collected on the surface of the electron emission material (not shown) of the cathode; and a shear focusing lens; And a third grid electrode 12, a fourth grid electrode 13, a first focusing and accelerating electrode 14, a second focusing and accelerating electrode 15, which form a main electrostatic lens, are sequentially disposed. One side of the focusing and accelerating electrode (the side of the electron beam traveling) serves as a ground for the graphite film (not shown) coated on the inner surface of the funnel 3 and is supported by the electron gun at the center of the neck portion 3a. Multiple rests The shield cup 17 to which the leaf spring 16 is fixed is arrange | positioned.

Different voltages are applied to the cathode 9 in order to obtain a constant current value so that the cut-off voltage of each electron gun is the same.

Therefore, when power is applied from the stem pin 18 to the heater in the cathode 9 constituting the triode of the electron gun, when the heater generates heat, the hot electrons are emitted from the electron emission material applied to the tip of the cathode.

The hot electrons emitted as described above are controlled by the first grid electrode 10 serving as the control electrode and accelerated by the second grid electrode 11 serving as the acceleration electrode, followed by the third and fourth grid electrodes 12 and 13 and the third electrode. 1 After being accelerated and focused while passing through the acceleration and focusing electrode 14 and passing through the first acceleration and focusing electrode 14 and the second acceleration and focusing electrode 15 constituting the asymmetric large-diameter main lens, The screen is reproduced by passing through the shadow mask 6, which is installed to be maintained at a predetermined interval from the fluorescent surface 2, and serves as color screening, and then collides with the fluorescent surface 2 to emit the fluorescent surface 2.

In the above operation, the deflection yoke 8 provided on the outer circumferential surface of the neck portion 3a of the funnel 3 deflects the electron beam 5 emitted from the electron gun to the entire fluorescent surface 2.

3 is a longitudinal sectional view showing a sleeve-type cathode that emits an electron beam toward the fluorescent surface side in the electron gun.

The sleeve-type cathode is a heater 19 to generate heat by applying a predetermined voltage in order to apply the heat energy required to emit electrons, and a cylindrical sleeve 20 is installed on the outer peripheral surface of the heater to receive the heat energy generated from the heater as radiant energy And a cap 21 for closing an upper portion of the sleeve, an electron-emitting material 22 that is applied to an upper surface of the cap to emit hot electrons as heat energy is transferred, and one end is fixed to an outer circumferential surface of the sleeve to provide high temperature heat. And a ribbon 23 for minimizing the deformation of the sleeve by the holder, and a holder 24 to which the other end of the ribbon is fixed.

Therefore, since the heater generates heat as a constant voltage is applied to the heater 19, heat energy is generated.

The heat energy generated as described above is transferred to the cylindrical sleeve 20 and the cap 21 as radiant energy to heat the electron radiating material 22 coated on the upper surface of the cap, so that hot electrons are emitted from the electron radiating material. The emitted hot electrons are controlled and accelerated by the first and second grids 10 and 11 as described above, and then refocused and accelerated while passing through a plurality of electrodes to collide with the fluorescent surface 2 to reproduce the screen. do.

However, such a conventional cathode welds the lower end of the plurality of ribbons 23 to the outer circumferential surface of the sleeve 20 and the upper end to the upper surface of the holder 24, respectively, so that the cylindrical sleeve 10 is positioned at the center of the holder 24. When welding one end of the ribbon 23 to the lower side of the outer circumferential surface of the sleeve 20, maintaining a constant angle to minimize the balance of the force and the change due to heat requires a great deal of attention, resulting in a decrease in productivity. do.

In addition, when the ribbon 23 is fixed to the sleeve 20, the angle of the ribbon does not maintain the correct angle, or due to the high temperature generated by the operation of the cathode, it is severe at the welded portion of the sleeve 20 and the ribbon 23. In case of deformation, it directly acts on the deterioration of cathode ray tube characteristics.

The present invention has been made to solve such a problem in the prior art, by forming the sleeve and the ribbon integrally to facilitate the production of the negative electrode and at the same time not to deform the sleeve or ribbon by the heat generated during operation of the negative electrode. The purpose is.

According to an aspect of the present invention for achieving the above object, a heater that generates heat when a constant voltage is applied, a cylindrical sleeve provided on the outer circumferential surface of the heater, a cap for closing the upper portion of the sleeve, and the upper surface of the cap An anode comprising a plurality of ribbons, one end of which is fixed to an outer circumferential surface of the sleeve, and a holder to which the other end of the ribbon is fixed, wherein the ribbon is formed on the outer circumferential surface of the sleeve. The cathode of the cathode ray tube electron gun formed by integrally fixing the upper end of the ribbon formed integrally with the sleeve to the upper surface of the holder is provided.

According to another aspect of the present invention, there is provided a method of fixing a cap to an upper surface of a cylindrical sleeve, integrating a plurality of ribbons to an outer circumferential surface of a sleeve to which a cap is fixed, and an upper end of a ribbon integrated in the sleeve to an upper surface of a holder. In the manufacturing method of the negative electrode consisting of the step of fixing, and applying an electron-emitting material on the upper surface of the cap fixed to the sleeve, preparing a cylindrical material in consideration of the length of the ribbon, by pressing the prepared cylindrical material Integrally forming a plurality of ribbons in the sleeve and the lower portion, bending up the ribbon formed in the lower portion of the sleeve, outward bending the remaining portion except the overlapping portion in the plurality of the upwardly bent ribbons, outward bending Provided is a method for manufacturing a cathode of an electron gun for cathode ray tube consisting of welding and fixing the upper end of the ribbon to the upper surface of the holder All.

1 is a cross-sectional view showing a typical colored cathode ray tube

FIG. 2 is a side view of the electron gun applied to FIG. 1. FIG.

Figure 3 is a longitudinal cross-sectional view showing a sleeve-type cathode

4 is an enlarged view of a portion A of FIG.

5 is a longitudinal sectional view showing a cathode of the present invention;

6 is an enlarged view of a portion B of FIG. 5;

7 is a flow chart showing a manufacturing process of the sleeve and the ribbon in the present invention

Figure 8 is a flow chart showing a manufacturing process of the sleeve and the ribbon in the present invention

9A and 9B are front views of another embodiment in which the sleeve and the ribbon are molded in the present invention.

Explanation of symbols for main parts of the drawings

20: sleeve 21: cap

23: ribbon 24: holder

26: cylindrical material

Hereinafter, the present invention will be described in more detail with reference to FIGS. 5 to 8 as an embodiment.

Figure 5 is a longitudinal cross-sectional view showing a negative electrode of the present invention, Figure 6 is an enlarged view of the portion B of Figure 5 and Figure 7 is a flow chart showing the manufacturing process of the sleeve and the ribbon in the present invention, the structure of the conventional negative electrode of the present invention and The same parts will be omitted and the same reference numerals will be given.

According to the present invention, a ribbon 23 supporting the sleeve 24 to the holder 24 is integrally formed on the outer circumferential surface of the sleeve 20, and an upper end of the ribbon 23 integrally formed with the sleeve 20 is formed of a conventional cathode. Similarly, welding is fixed to the upper surface of the holder 24.

Although the bottom surface of the ribbon 23 integrally formed on the sleeve 20 and upwardly bent may be configured to coincide with the bottom surface of the sleeve 20 as illustrated in FIG. 5, according to a need (model) 9A and 9B shown in another embodiment, the bottom bent upwardly may be configured to be positioned below or below the bottom of the sleeve 20.

The overlapping portion of the ribbon 23 and the sleeve 20, which is bent upward as described above, is fixed by welding 25 as shown in FIG.

This is to minimize thermal deformation at the connection portion between the sleeve 20 and the ribbon 23 even though the high temperature heat generated by the heater 19 is transferred to the sleeve 20 according to the operation of the cathode.

Referring to Figures 7 and 8 attached to the manufacturing method of the present invention configured as described above in more detail as follows.

First, in consideration of the length of the ribbon 23 to prepare a cylindrical material 26 (S ₁ ) and then press-prepared prepared cylindrical material 26 as shown in Figure 7 the sleeve 20 and a plurality of ribbons (below) 23) It is integrally formed while maintaining a certain angle (120 ° when three ribbons) (S ₂ )

After the plurality of ribbons 23 are integrally formed in the sleeve 20 as described above, the formed ribbons 23 are bent upward by 180 ° so that the ribbons 23 overlap the sleeves 20 (S ₃ ) and then upwardly bent. The remaining portion of the plurality of ribbons 23 except for the overlapping portion L is bent outward to obtain a sleeve 20 in which the ribbon 23 is integrated. (S ₄ )

After that, when the cap 21 is fixed to the upper surface of the sleeve 20 and then the sleeve is inserted into the holder 24, the upper end of the outwardly bent ribbon 23 is connected to the upper surface of the holder 24 so that their connection is made. By welding the surface, the cathode assembly is obtained.

As described above, according to the present invention, since the ribbon is integrally formed in the sleeve at a predetermined interval as the cylindrical material is pressed, the welding work of the sleeve and the ribbon is not necessary, and thus the welding work is precisely maintained while maintaining the gap of the ribbon as in the prior art. There is no need to do this, which improves productivity.

In addition, even when the sleeve is thermally expanded by the heater during operation of the electron gun, the overall balance of the cathode is maintained, thereby preventing the phenomenon of deterioration of the characteristics of the cathode ray tube by heat.

Claims (10)

A heater that generates heat when a predetermined voltage is applied, a cylindrical sleeve installed on an outer circumferential surface of the heater, a cap that closes an upper portion of the sleeve, and an electromagnetic radiation applied to an upper surface of the cap to emit hot electrons as heat energy is transferred. A cathode comprising a material, a plurality of ribbons of which one end is fixed to an outer circumferential surface of the sleeve, and a holder to which the other end of the ribbon is fixed, wherein the ribbon is formed integrally with the sleeve by integrally forming a ribbon on the outer circumferential surface of the sleeve. The cathode of the electron gun for cathode ray tube, which is fixed by fixing the top to the top of the holder The method of claim 1, The cathode of an electron gun for cathode ray tubes in which the upwardly bent bottom of the ribbon coincides with the bottom of the sleeve. The method of claim 1, A cathode of an electron gun for a cathode ray tube, wherein an upwardly bent bottom surface of the ribbon is located below the bottom surface of the sleeve. The method of claim 1, A cathode of an electron gun for a cathode ray tube, wherein an upwardly bent bottom surface of the ribbon is positioned above the bottom surface of the sleeve. The method according to any one of claims 1 to 4, Cathode of electron beam gun for cathode ray tube welded with overlap of sleeve and ribbon. Securing a cap to an upper surface of the cylindrical sleeve, integrating a plurality of ribbons on an outer circumferential surface of the sleeve to which the cap is fixed, fixing an upper end of the ribbon integrated in the sleeve to an upper surface of the holder, and fixing to the sleeve In the manufacturing method of the negative electrode comprising the step of applying an electrospinning material on the upper surface of the cap, the step of preparing a cylindrical material in consideration of the length of the ribbon, by pressing the prepared cylindrical material to a plurality of ribbons in the sleeve and the lower Integrally forming, bending up the ribbon formed on the lower portion of the sleeve, bending out the remaining portions except the overlapping portion of the plurality of ribbons upwardly bent, and the upper end of the ribbon outwardly bent on the upper surface of the holder. Cathode manufacturing method of electron gun for cathode ray tube comprising the step of fixing to welding. The method of claim 6, A cathode manufacturing method for an electron gun for a cathode ray tube, wherein the ribbon is bent upward so that the bottom of the ribbon is aligned with the bottom of the sleeve. The method of claim 6, A cathode manufacturing method for an electron gun for a cathode ray tube, which is formed by bending a ribbon upward so that a bottom of a ribbon is located below a bottom of a sleeve. The method of claim 6, A method for manufacturing a cathode of an electron gun for a cathode ray tube, wherein the lower side of the sleeve is cut out so that the bottom of the ribbon is positioned above the bottom of the sleeve, and then the ribbon is bent upward. The method according to any one of claims 6 to 9, And bending the outwardly bent plurality of ribbons outward and then welding and fixing the overlapping portions of the sleeves and the ribbons.