KR100777715B1 - Color cathode ray tube with electron gun - Google Patents

Abstract

A color cathode ray tube having an electron gun according to the present invention includes a funnel having a neck portion, a panel sealed with the funnel and having a fluorescent film formed on an inner surface thereof, and a large diameter electron beam passing hole through which three electron beams pass through. The eccentric distance S (mm) between the central electron beam passing through the main lens formed by the main lens and the outer electron beam satisfies the inequality 4.06mm ≤ S ≤ 4.46mm, and the outer electron beam adjacent to one side of the three electron beam arrangement directions of the large-diameter electron beam passing hole An electron gun satisfying the inequality 11.9mm-1.91 x DH <0.35 x S <12.5mm-1.91 x DH when the distance between the electrodes is DH (mm).

Description

Color cathode ray tube with electron gun

1 is a cross-sectional view of a typical cathode ray tube,

2 is a cross-sectional view of an electron gun for a color cathode ray tube according to the present invention;

3 is a view showing a state in which the large-diameter electrode of the electron gun is inserted into the neck portion;

4 is a graph showing the eccentricity and the convergence relationship

5 is a graph showing the relationship between the electron beam eccentricity and the amount of eccentricity of the electrode

The present invention relates to a color cathode ray tube, and more particularly, to a color cathode ray tube having an inline electron gun mounted on the neck portion and having improved eccentricity of the electron beam passing space.

Color cathode ray tubes have the disadvantage of being bulky and heavy, but have high resolution and high luminance of images and a relatively long lifespan. Recently, the development of a display device having the same performance as that of the color cathode ray tube has not been made. Therefore, the color cathode ray tube is also planarized and enlarged due to the increase in the size of the display element.

Figure 1 shows an example of such a color cathode ray tube.                         

As shown, a panel 3 having a screen surface 2 for reproducing an image when a screen is reproduced as a transparent window, and a shadow mask frame assembly 4 provided to be spaced apart from the screen surface by a predetermined distance within the panel 3. ), A funnel (5) encapsulated with the panel (3) to form an outer container of a cathode ray tube, an electron gun (6) enclosed in the neck (5a) of the funnel (5), and the funnel (5). It comprises a deflection yoke (7) installed in the cone portion (5b) of the.

The screen surface 2 of the panel has a fluorescent film formed on the inner surface in a predetermined pattern, that is, a dot or stripe. The electron gun 6 installed in the neck portion has a structure in which a plurality of electrodes in which three electron beam through holes are arranged in a horizontal direction and a cathode assembly that is a hot electron emission source are fixed to the bead glass.

The cathode ray tube configured as described above is selectively deflected by the deflection yoke 7 according to the scanning position of the electron beam 6 from the electron gun 6. The deflected electron beam is landed on the fluorescent film to excite each phosphor to form an image. The viewer who views the image formed as described above can say that the image formed by the emission of the fluorescent film formed on the inner surface of the panel 2 is viewed.

In the color cathode ray tube as described above, the inline electron gun 6 provided in the neck portion of the funnel 5 has a deflection yoke in the vertical direction perpendicular to the horizontal direction and the array direction of the electron beam passing holes ( Bias force difference from 6) occurs. In particular, 96% of the power consumption of the color cathode ray tube is consumed by the deflection yoke. In order to reduce the power consumption of the deflection yoke, it is necessary to narrow the distance between the deflection yoke and the deflection center. In order to increase the deflection sensitivity by the deflection yoke and improve the deflection force, it is preferable to reduce the diameter of the neck portion to narrow the gap between the inner circumferential surface of the deflection yoke and the deflection center.

Color cathode ray tubes with a reduced neck diameter as described above are disclosed in Japanese Patent Laid-Open Nos. 5-299027, US Pat. No. 5,572,084, US Pat. No. 5,708,332.

The cathode ray tube disclosed in Japanese Patent Application Laid-open No. Hei 5-299027 has a distance S (mm) between the centers of the three electron beams in contact with each other, and an electron beam center distance S and an opening diameter D (mm) perpendicular to the inline electron beam arrangement direction of the common electrode. When S <5.0, D> S is set, S and D are set by a relationship of 55S-20D?

The color cathode ray tube defines the distance between the center of the electron beam and the aperture diameter based on the reduction in the diameter of the neck portion, but the electrode size of the electron gun decreases due to the reduction in the diameter of the neck portion. Since the distance between the distance between the side beam and the edge of the large-diameter electron beam through hole is reduced, the deterioration of the focus of the electron beam and the distortion of the beam shape (coma aberration) are relatively important to the design of the electron gun.

The present invention can reduce the design constraints of the electron gun according to the diameter reduction of the neck portion and the adoption of the large-diameter lens in order to solve the above problems, and the color cathode ray with the electron gun that can prevent the convergence drift characteristics and focus deterioration of the electron beam The purpose is to provide a coffin.

In order to achieve the above object, in the present invention, the eccentric distance S (mm) between the central electron beam and the outer electron beam passing through the main lens formed by the large-diameter electron beam passing holes through which the three electron beams pass through is inequality 4.06mm ≤ S ≤ 4.46mm When the distance between one side of the three electron beam array direction of the large-diameter electron beam passing hole and the adjacent outer electron beam is DH (mm), an inequality 11.9 mm-1.91 x DH ≤ 0.35 x S ≤ 12.5 mm-1.91 x DH A funnel having a satisfactory electron gun, a neck portion on which the electron gun is mounted, and a panel sealed to the funnel and having a fluorescent film formed on an inner surface thereof.

In the present invention, the three cathodes constituting the triode of the electron gun are set so that the eccentric distance ST (mm) between the three electron beams respectively emitted therefrom satisfies the inequality 4.1 mm ≤ ST ≤ 4,75 mm, the neck portion The outer diameter ND (mm) is set to satisfy the inequality 20.1 mm ≤ ND ≤ 23.1 mm.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows an example of a color cathode ray tube, Figure 2 shows a cross-sectional view of the electron gun, Figure 3 is a partial cross-sectional view of the electron gun mounted on the neck portion.

As shown, the color cathode ray tube 1 is sealed to the panel 3 and the panel 3 having the fluorescent film 2 formed therein, and the outer diameter ND of the neck portion 11 is greater than or equal to 20.1 mm and 23.1. a funnel 10 smaller than or equal to mm, an electron gun 20 provided on the neck portion 11 of the funnel, and a deflection yoke 6 formed over the neck portion 11 and the cone portion 12; Include.                     

The electron gun 20 is sequentially installed from the three cathodes 21R, 21G and 21B arranged inline as shown in FIG. 2 and the cathodes 21R, 21G and 21B. The first, second and third focus electrodes 24, 25, 26 and the third focus electrode 26 form an auxiliary lens with the control electrode 22 and the screen electrode 23 having the electron beam through holes, respectively. It includes a final acceleration electrode 27 is installed adjacent to form a main lens. The electrode forming the auxiliary lens is not limited to the first, second and third focus electrodes 24, 25 and 26, and the number of electrodes may vary according to the multi-focus concentration of the electron beam and the lens formation state, and their electron beams. The shape of the through hole can also be changed into various forms, of course.

The output side of the third focus electrode 26 and the incidence side of the final acceleration electrode 27 constituting the main lens are the external electrodes 26a and 27a having the large-diameter electron beam passing holes 26H and 27H, respectively, The internal electrode 26b inserted into each of the external electrodes 26a and 27a and having three independent small-diameter electron beam passing holes 26R, 26G, 26B, and 27R, 27G, 27B formed therein. (27b).

The eccentric distance ST between the three cathodes and the three electron beams constituting the triode is set to satisfy the inequality 4.1 ≤ ST ≤ 4.75. And the eccentric distance S of the three electron beams emitted from the respective cathodes 21R, 21G, 21B and passing through the main lens formed between the third focus electrode 26 and the final acceleration electrode 27. As shown in FIG. 3, the eccentric distance S between the central electron beam BC and the outer electron beam BS is set to satisfy an inequality of 4.06 mm ≦ S ≦ 4.46 mm.

Meanwhile, the horizontal width of the large-diameter electron beam through-hole 26H in the direction in which the three electron beams are arranged is referred to as D mm, and the graph of FIG. 4 and Table 1 are obtained by experiments, and ΔCg = − 12.2 + 1.91xD-3.47 x S is defined by Equation 1, the difference of 2S (D-2S = DH) which is the eccentric distance between the electron beams from the horizontal width length is DH mm, and the focus voltage is varied by ± 500V. The DH value is set to satisfy the inequality 11.9-1.91 x DH ≤ 0.35 x S ≤ 12.5-1.91 x DH when the amount of Cg is allowed within the design range tolerance of ± 0.3.

The limitation of the inequality as described above will be more clearly defined by the graph as shown in FIG. 4 obtained by the inventors by experiment and Table 1 below.

Table 1

       S D 4.02 4.06 4.1 4.14 4.22 4.42 4.46 4.5 14.7 1.98 1.84 1.71 1.57 1.29 0.59 0.45 0.31 14.5 1.6 1.46 1.32 1.18 0.9 0.21 0.07 -0.07 14.2 1.03 0.89 0.75 0.61 0.33 -0.36 -0.5 -0.64 14 0.64 0.51 0.37 0.23 -0.05 -0.75 -0.89 -1.02 13.9 0.45 0.31 0.18 0.04 -0.24 -0.94 -1.08 -1.22 13.8 0.26 0.12 -0.02 -0.16 -0.43 -1.13 -1.23 -1.41 13.7 0.07 -0.07 -0.21 -0.35 -0.62 -1.32 -1.46 -1.6 13.5 -0.31 -0.45 -0.59 -0.75 -1.01 -1.7 -1.84 -1.98 13.2 -0.89 -1.03 -1.16 -1.3 -1.58 -2.28 -2041 -5.55

As can be seen from the graph and table shown in FIG. 4, the horizontal width D of the large-diameter electron beam passing hole has a diameter of 13.7 mm to 14.5 mm, and the eccentric distance S is greater than or equal to 4.06 mm and smaller than 4.46 mm. At the same time, the change in the convergence of the three electron beams was minimized.

In order to secure the eccentric distance when passing through the main lens, the eccentricity of the electron beam passing hole formed in at least one of the electrodes between the control electrode 22 and the third focus electrode 26, unlike the eccentric distance ST between the three electron beams. The eccentric distance SC is used to realize the eccentricity ΔS = | ST-SC |, and the beam eccentric distance ΔSb = S-ST, and the relationship between ΔS and ΔSb is shown in FIG. I was able to get a graph. Based on the graph of FIG. 5, ΔSb = −0.08 −4 × ΔS which is {Formula 2} was obtained. Representing the inequality mentioned above as such, it can be expressed as 1.91 x DH +0.35 x ST-12.258 ≤ 1.4 x ΔS ≤ 1.91 x DH + 0.35 x ST-11.928.

Meanwhile, the electron gun for the color cathode ray tube according to the present invention should be inserted into the neck portion having an outer diameter (ND) greater than or equal to 20.1 mm and smaller than or equal to 23.1 mm, thereby reducing the overall size of the electrode but increasing the eccentric distance S as described above. The design flexibility of the electron gun to ensure the quality is ensured, and the depth DP1 of the large diameter, which is the distance from the end of the external electrode 26a of the third focus electrode 26 forming the main lens, to the internal electrode 26b and The large-diameter depth difference which is the difference DP1-DP2 of the large-diameter depth DP2 which is the distance from the edge part of the outer electrode 27a of the final acceleration electrode 27 to the inner electrode 27b is defined as DP.

The present inventors have conducted the relationship between the large-diameter depth difference (DP = DP1-DP2) and the change in convergence (ΔCg) based on the horizontal width of the large diameter and the eccentric distance of the electron beam passing through the main lens. I was able to get together.

TABLE 2

    S D DP  -0.2 -0.1 0 0.1 0.2 4.06 13.7 0.38 0.27 0.16 0.05 -0.05 13.8 0.49 0.38 0.28 0.17 0.06 13.9 0.61 0.5 0.39 0.28 0.17 14 0.72 0.61 0.51 0.4 0.29 D DP -0.2 -0.1 0 0.1 0.2 4.14 13.7 0.15 0.03 -0.09 -0.21 -0.33 13.8 0.29 0.17 0.05 -0.07 -0.19 13.9 0.43 0.31 0.19 0.07 -0.05 14 0.57 0.45 0.33 0.21 0.09 D DP -0.2 -0.1 0 0.1 0.2 4.22 13.7 -0.08 -0.22 -0.35 -0.48 -0.61 13.8 0.08 -0.05 -0.18 -0.31 -0.45 13.9 0.25 0.11 -0.02 -0.15 -0.28 14 0.41 0.28 0.15 0.02 -0.17 D DP -0.2 -0.1 0 0.1 0.2 4.42 13.7 -0.66 -0.82 -0.98 -1.15 -1.31 13.8 -0.43 -0.59 -0.77 -0.92 -1.08 13.9 -0.2 -0.37 -0.53 -0.69 -0.85 14 0.02 -0.14 -0.3 -0.46 -0.62 D DP -0.2 -0.1 0 0.1 0.2 4.46 13.7 -0.78 -0.94 -1.11 -1.28 -1.48 13.8 -0.54 -0.7 -0.87 -1.04 -1.21 13.9 -0.29 -0.46 -0.63 -0.8 -0.97 142 -0.05 -0.02 -0.39 -0.562 -0.73

Cg = 172-46.2xS-11.6xD + 5.01x DP + 3.14 x S x D-1.5 x through analysis using data when the change of Cg was allowed to ± 0.3 when the focus voltage applied to the focus electrode was changed to ± 500V. If S x DP is defined as {Equation 3} and the convergence of the electron beam satisfies the inequality -0.3≤Cg≤0.3, for simplicity of expression A = (46.2xS + 11.6xD)-(3.14 x S x D) In other words, Cg = 172-A + (5.01-1.5xS) DP. When ΔCg static voltage is allowed to ± 500 V ± 0.3, the depth of the large diameter is set to satisfy (A-172.3) / (5.01-1.5xS) ≤ DP ≤ A-171.7 / (5.01-1.5xS).

In addition, as described above, unlike the eccentric distance ST between the three electron beams at the cathodes 21R, 21G and 21B and the control electrode 22, the cathode and the third focus electrode at the control electrode are different. 5 by reducing the incident angle of the electron beam to the main lens formed by the third focusing electrode 26 and the final acceleration electrode 27 by giving SC an eccentric distance using eccentricity to one or more electrodes of the electrode as shown in FIG. Likewise, the spherical aberration of the electron beam passing through the main lens is less affected, thereby reducing the focus deterioration of the electron beam.

As described above, the color cathode ray tube having the electron gun of the present invention is different in the cathode and the control electrode from the eccentric distance of the electron beam passing through the main lens, the depth of the large-diameter lens, and the eccentric distance ST between the three electron beams in the cathode and the control electrode. Deterioration of focus and convergence characteristics due to the reduction of the neck diameter and the reduction of the electrode of the electron gun inserted therein by adjusting the eccentric distance by eccentrically forming electron passing through holes formed in at least one of the electrodes between the third focus electrodes. Can be solved fundamentally.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

A funnel having a neck portion, a panel encapsulated with the funnel and having a fluorescent film formed on an inner surface thereof, and mounted on the neck portion, wherein an eccentric distance ST (mm) of an electron beam from which three cathodes are emitted from each is inequality 4.1 mm ≤ ST Arranged to satisfy ≤ 4.75mm, The eccentric distance S (mm) between the central electron beam and the outer electron beam passing through the main lens formed by the large-diameter electron beam passing holes through which all three electron beams pass together satisfies the inequality 4.06mm ≤ S ≤ 4.46mm, and the large-diameter electron beam passing hole When the distance between one side of the three electron beam array direction and the adjacent outer electron beam is DH (mm), an electron gun that satisfies the inequality 11.9mm-1.91 x DH ≤ 0.35 x S ≤ 12.5mm-1.91 x DH Cathode ray tube with electron gun made. The method of claim 1, The outer diameter ND (mm) of the neck portion is a color cathode ray tube with an electron gun, characterized in that it is set to satisfy the inequality 20.1mm ≤ ND ≤ 23.1mm. The method of claim 1, When A = (46.2 x S + 11.6 x D)-(3.14 x S x D) (mm), the depth DP (mm) of the large-diameter lens of the main lens is inequality (A-172.3mm) / (5.01mm A color cathode ray tube with an electron gun, characterized in that it is set to satisfy 1.5 x S) ≤ DP ≤ (A-171.7 mm) / (5.01 mm-1.5 x S). The eccentric distance between a funnel having a neck portion, a panel encapsulated with the funnel and having a fluorescent film formed on an inner surface thereof, and mounted on the neck portion, is called ST (mm), which is an eccentric distance between the three cathodes and the electron beam emitted from each of the cathodes. When the eccentric distance of the electron beam through hole formed in at least one of the electrodes between the control electrode disposed adjacently and the focus electrode forming the main lens is SC (mm), the difference in the eccentricity of the electron beam through hole is ΔS = ST-SC In this case, the distance between the electron beams is defined as ΔSb = S−ST, and the distance between one side of the three electron beam arraying directions of the electron beam passing hole and the adjacent outer electron beam is DH (mm), inequality 1.91 x DH + 0.35 x ST − A color cathode ray tube with an electron gun, characterized by satisfying 12.528 mm ≤ 1.4 x ΔS ≤ 1.91 x DH + 0.35 x ST-11.928 mm.

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