JP2002025463A - In-line electron gun auxiliary electrode, in-line electron gun, assembly method of the in-line electron gun, and electron lens correction method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable correction of the slippage of the electron lens property (spot property) easily in a short time. SOLUTION: The electron gun comprises an electron beam passing hole (201), in which the center beam and the side beam pass, and an arc portion (201r, 201b) of more than a semicircle is respectively provided, at the both end of the belt portion (201g) at the periphery of the electron beam passing hole. The arc portion has the same diameter and the same concentricity as those of the side-beam passing holes (101r, 101b) of the chest electrode (101). An auxiliary electrode (200) of nearly a cylindrical shape, of which the width of the belt portion is narrower than the diameter of the side-beam passing holes, is added at the other face of the face, where the head electrode (102) of the above chest electrode is provided. Thereby the main electron lens property is corrected in the case the main electron lens property is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an in-line type electron gun used for a cathode ray tube.

[0002]

2. Description of the Related Art FIG. 3 is an XZ sectional structural view of a color cathode ray tube. In FIG. 3, 1 is a funnel portion, 2 is a deflection yoke, 3 is an in-line type electron gun, 3a is a low voltage portion of the electron gun 3, 3b is a high voltage portion of the electron gun 3, 4 is a center plane of the main electron lens, and 5 is a neck. Part, 6 is the trajectory of three electron beams, 6
r and 6b are orbits of two side beams of the three electron beams 6, 6g is a center beam orbit of the three electron beams 6, and 7 is a screen portion.

FIG. 4 is a YZ sectional structural view of a conventional in-line type electron gun. In FIG. 4, the same as FIG.
8 are heaters, 9 is a cathode, 10 is a first electrode, 20 is a second electrode, 30 is a third electrode, 40 is a fourth electrode, 50 is a fifth electrode, and 51 is a fifth electrode. A chest electrode of the electrode 50; 52, a head electrode of the fifth electrode 50;
Electrode, 61 is a chest electrode of the sixth electrode 60, and 62 is the sixth electrode.
The head electrode 70 of the electrode 60 (70a and 70b) is an insulating support.

FIGS. 5A and 5B are structural diagrams of a fifth electrode 50 or a sixth electrode 60, wherein FIG. 5A is a front view and FIG. 5B is a side view. In FIG. 5, reference numeral 100 denotes a fifth electrode or a sixth electrode 60, 101 denotes a chest electrode, 101r and 101b denote side beam passage holes of the chest electrode 101, 101g denotes a center beam passage hole of the chest electrode 101, and 102 denotes a head electrode. is there. When the electrode 100 in FIG. 5 is the fifth electrode 50 in FIG.
1, and the head electrode 102 is the chest electrode 52. When the electrode 100 in FIG. 5 is the sixth electrode 60 in FIG. 4, the chest electrode 101 is the chest electrode 61 and the head electrode 102 is the chest electrode 62.

[0005] First electrode 10, second electrode 20, third electrode 3
The 0, the fourth electrode 40, the fifth electrode 50, and the sixth electrode 60 are fixed at desired positions by insulating support members 70a and 70b, which are electrical insulators, through uprights inserted into the insulating support member 70, respectively. Have been.

[0006] Third electrode 30, fourth electrode 40, fifth electrode 5
The zero and sixth electrodes 60 constitute a main electron lens electrode structure for generating a main electron lens. The center plane 4 of the main electron lens generated by this main electron lens electrode structure is the fifth plane.
It is located between the electrode 50 and the sixth electrode 60.

[0007] The fifth electrode 50 has a chest electrode 51 and a head electrode 52. The sixth electrode 60 has a chest electrode 61 and a head electrode 62. The fifth electrode 50 and the sixth electrode 60 constituting the main electron lens electrode structure are arranged as shown in FIG. 4 with the head electrode 52 and the head electrode 62 facing each other. The fifth electrode 50 and the sixth electrode 60 each have a structure like the electrode 100 in FIG.

The electrode 100 shown in FIG. 5 has a structure in which a substantially cylindrical head electrode 102 is fixed to one surface of a substantially flat chest electrode 101. The chest electrode 101 is provided with a center beam passage hole 101g for passing the center beam 6g (see FIG. 3) and side beam passage holes 101r and 101b for passing the side beams 6r and 6b, respectively. Side beam passage holes 101r, 101
b are provided at both ends of the center beam passage hole 101g.

In the color cathode ray tube shown in FIG.
On the basis of the potential of the first electrode 10, 0 to 20 is applied to the cathode 9.
About 0 [V], 1 is applied to the second electrode 20 and the fourth electrode 40.
About 2000 to 2000 [V], and the sixth electrode 60
A potential of about 0 to 35000 [V] and a potential of about 20 to 35 [%] of the sixth electrode 60 are applied to the third electrode 30 and the fifth electrode 50.

Since the potential arrangement of the cathode 9, the first electrode 10, and the second electrode 20 is as described above, the amount of current emitted from the cathode 9 can be controlled by changing the potential of the cathode. Has become. Also, due to the above potential arrangement,
An electron lens that converges the current emitted from the cathode 9 in the Z-axis direction is generated at a position from the cathode 9 to the vicinity of the first electrode 10. The current emitted from the cathode 9 is applied to the first electrode 10
Then, the beam is converged and accelerated by the second electrode 20, and enters the main electron lens as three electron beams 6 (a center beam 6g and side beams 6r and 6b). The electron beam 6 is applied between the first electrode 10 and the second electrode 20,
Alternatively, a portion that can be reduced to the minimum diameter is formed between the second electrode 20 and the third electrode 30 depending on conditions. This part is called an object point, its cross-sectional diameter is called an object point diameter, and its position (Z
Direction position) is called an object point position. This object point is a so-called electron lens system in which the electron beam 6 is finally converged on the screen unit 7 by the main electron lens generated by the third electrode 30 to the sixth electrode 60 arranged thereafter. It has the same meaning as the object point of the optical system.

The electron beam 6r incident on the main electron lens,
The beams 6g and 6b are converged and accelerated by the main electron lens, deflected and scanned by the deflection yoke 2, passed through the color selection electrodes, irradiated on the screen 7, and scanned on the screen 7. The main electron lens is mainly composed of the fifth electrode 5
Generated by the zero and sixth electrodes 60. Fifth electrode 5
A potential difference corresponding to the above potential arrangement is generated between the zero and the sixth electrode 60, and the main electron lens is generated mainly by this potential difference. Each electron beam 6r, 6
Since g and 6b pass through different positions of the head electrodes 52 and 62, the electric fields (lens action) received by the respective electron beams from the head electrodes 52 and 62 are different. Also,
In each electron beam, the in-line direction (X
Direction) or in a portion where the position in the vertical direction (Y direction) is different, the electric field (lens action) received from the head electrodes 52 and 62 is different. As a result, the positions of the electron beams 6r, 6g, and 6b on the screen unit 7 may be shifted, and the spot diameter on the screen unit 7 may be increased. To correct this, three electron beam passage holes (101r, 101g, 101b in FIG. 5) through which the electron beams 6r, 6g, 6b pass independently.
The electric field is adjusted by arranging the chest electrodes 51 and 61 provided with the reference electrodes (see FIG. 2) so that the image on the screen unit 7 by the respective electron beams is adjusted to be optimal.

When the electron beam 6 is scanned on the screen section 7 by the deflection yoke 2, the length of the trajectory through which the electron beam passes differs between the center position of the screen and the maximum position scanned by the deflection yoke 2. The main electronic lens is
It is designed so that the spot diameter of each electron beam 6r, 6g, 6b is minimized at any position from the center position of the screen to the maximum position.

The electrode components constituting the main electron lens electrode structure must not change the position of the minimum spot diameter of the electron beam due to dimensional errors. For this reason, it is made by a manufacturing method such as a precision press so that it can be manufactured with precise dimensions.

[0014]

However, in the conventional in-line type electron gun, even if the electrode parts constituting the main electron lens electrode structure are manufactured by a precise manufacturing method such as a precision press as described above, each of the respective parts is formed. Due to the combination of the dimensional errors described above, the characteristics of the main electron lens may change unacceptably and the position of the minimum spot diameter may shift. Originally, this deviation can be corrected to normal electron lens characteristics (spot characteristics on the screen section 7) by correcting the dimensions of the above-mentioned electrode parts, but correction requires a long time even in a precision press. Also, since the correction amount is close to the limit of the precision press, there is a problem that the correction is often over-corrected or the press die itself is damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and can easily and easily correct a shift (change) of an electron lens characteristic (spot characteristic) due to a dimensional error of an electrode component. The purpose is to:

[0016]

The auxiliary electrode of the in-line type electron gun according to the first aspect of the present invention has side beam passing holes for passing side beams on both sides of the center beam passing hole for passing the center beam. An in-line type electron gun having an electron lens electrode structure including a substantially flat chest electrode and a substantially cylindrical head electrode fixed to the first surface of the chest electrode directly on the second surface of the chest electrode An auxiliary electrode for fixing an electron lens characteristic by being fixed, and has one electron beam passage hole through which a center beam and a side beam pass, and the periphery of the electron beam passage hole is provided at both ends of a band portion. Each of the semi-circular or arc portions is provided, the arc portion is the same diameter and concentric with the side beam passage hole, and the width of the band portion is equal to the side beam passage hole. Characterized in that narrower than the diameter.

According to a second aspect of the present invention, there is provided an in-line type electron gun having a substantially flat first chest electrode having side beam passage holes for passing side beams on both sides of a center beam passage hole for passing a center beam. A substantially cylindrical first head electrode fixed to the first surface, and a substantially flat second chest electrode provided with the side beam passage holes on both sides of the center beam passage hole are fixed to the first surface. In the in-line type electron gun having an electron lens electrode structure in which the provided substantially cylindrical second head electrode is disposed so as to face the second head electrode, one or both of the first chest electrode and the second chest electrode are provided in the second. The auxiliary electrode according to claim 1 is directly fixed to the surface.

According to a third aspect of the present invention, there is provided the method of assembling an in-line type electron gun according to the second aspect, wherein the arc portion of the auxiliary electrode and the side of the chest electrode are formed. After positioning the auxiliary electrode with respect to the chest electrode by passing a positioning pin through the beam passage hole, the auxiliary electrode is fixed to the chest electrode.

According to a fourth aspect of the present invention, there is provided a method for correcting an electron lens of an in-line type electron gun, comprising: a substantially flat plate having side beam passing holes for passing side beams on both sides of a center beam passing hole for passing a center beam; A first head electrode having a substantially cylindrical shape fixed to the first surface of the first chest electrode; and a second chest electrode having a substantially flat plate provided with the side beam passage holes on both sides of the center beam passage hole. A method for correcting an electron lens characteristic of an in-line type electron gun having an electron lens electrode structure in which a substantially cylindrical second head electrode fixedly mounted on a first surface is disposed so as to face the electronic head, wherein the electron lens characteristic is If the desired characteristics have changed, the first
The electron lens characteristic is corrected to the desired characteristic by fixing the auxiliary electrode according to claim 1 on the second surface of one or both of the chest electrode and the second chest electrode. And

[0020]

FIG. 1 is a YZ sectional view of an in-line type electron gun according to an embodiment of the present invention. FIG. 1A is a YZ sectional view when an auxiliary electrode is provided on a fifth electrode, and FIG. FIG. 7 is a YZ sectional view when an auxiliary electrode is provided on the sixth electrode. In FIG. 1, the same components as those in FIG.
0 is the first electrode, 20 is the second electrode, 30 is the third electrode, 40
Is the fourth electrode, 50 is the fifth electrode, 51 is the chest electrode of the fifth electrode 50, 52 is the head electrode of the fifth electrode 50, 60 is the sixth electrode, 61 is the chest electrode of the sixth electrode 60, and 62 is the fifth electrode. The head electrode 200 of the sixth electrode 60 is an auxiliary electrode provided on the fifth electrode 50 or the sixth electrode 60.

FIG. 2 is a structural view of a fifth electrode 50 or a sixth electrode 60 provided with an auxiliary electrode, wherein (a) is a front view,
(B) is a side view. 2, the same components as those in FIG. 5 are denoted by the same reference numerals, and 100 is the fifth component in FIG.
The electrode 50 or the sixth electrodes 60 and 101 in FIG. 1B are chest electrodes, and 101r and 101b are chest electrodes 101.
101g is a chest electrode 101
Center beam passage hole, 102 is a head electrode, 200
Denotes an auxiliary electrode, 201 denotes an electron beam passage hole of the auxiliary electrode 200, 201g denotes a band of the electron beam passage hole 201, 201
r and 201b are circular arc portions of the electron beam passage hole 201;
0 is a positioning pin (the auxiliary electrode 200 is connected to the chest electrode 10).
1 is a jig used in the assembling step of fixing the jig to the first jig. When the electrode 100 in FIG. 2 is the fifth electrode 50 in FIG. 1A, the chest electrode 101 and the head electrode 102 correspond to the chest electrode 51 and the head electrode 52, respectively. When the electrode 100 in FIG. 2 is the sixth electrode 60 in FIG. 1B, the chest electrode 101 and the head electrode 102 correspond to the chest electrode 61 and the head electrode 62, respectively.

The in-line type electron gun shown in FIG. 1A includes a heater 8, a cathode 9, a first electrode 10, a second electrode 20,
It includes a third electrode 30, a fourth electrode 40, a fifth electrode 50, a sixth electrode 60, an insulating support 70, and an auxiliary electrode 200 provided on the fifth electrode 50. That is, FIG.
The in-line type electron gun of FIG.
Is provided with an auxiliary electrode 200.

The in-line type electron gun shown in FIG. 1B has a heater 8, a cathode 9, a first electrode 10, a second electrode 20, a third electrode 30, a fourth electrode 40, 5 electrodes 5
0, the sixth electrode 60, the insulating support 70, and the sixth electrode 6
And an auxiliary electrode 200 provided at 0. That is, the in-line type electron gun shown in FIG.
The auxiliary electrode 200 is provided on the electrode 60.

In the in-line type electron gun shown in FIG.
Electrode 30, fourth electrode 40, fifth electrode 50, sixth electrode 16
0 constitutes a main electron lens electrode structure for generating a main electron lens. The fifth electrode 50 includes a chest electrode 51,
And a head electrode 52. The sixth electrode 60 has a chest electrode 61 and a head electrode 62. The fifth electrode 50 and the sixth electrode 50 constituting the main electron lens electrode structure.
The electrode 60 is arranged as shown in FIG. 1 with the head electrode 52 and the head electrode 62 facing each other. Auxiliary electrode 200
The fifth electrode 50 of FIG. 1A provided with
Each of the sixth electrodes 60 of FIG. 1B provided with 00 has a structure as shown in FIG.

The electrode 100 in FIG. 2 (corresponding to the fifth electrode 50 in FIG. 1A or the sixth electrode 60 in FIG. 1B)
A structure in which a substantially cylindrical head electrode 102 (corresponding to the head electrode 52 or 62) is fixed to one surface (first surface) of a substantially flat chest electrode 101 (corresponding to the chest electrode 51 or 61). Have. The chest electrode 101 has a center beam passage hole 101g through which the center beam 6g (see FIG. 3) passes, and side beams 6r,
6b (see FIG. 3) are provided, respectively, for passing side beam passing holes 101r and 101b. The side beam passage holes 101r and 101b are provided at both ends of the center beam passage hole 101g. The side beam passage holes 101r and 101b are substantially circular, and the center beam passage hole 101g is an ellipse having a major axis in the vertical direction (Y direction). The major diameter of the center beam passage hole 101g is shorter than the diameters of the side beam passage holes 101r and 101b.

The auxiliary electrode 200 is directly fixed to the surface (second surface) of the chest electrode 101 opposite to the surface on which the head electrode 102 is provided. The auxiliary electrode 200 is a substantially cylindrical electrode, and has one electron beam passage hole 2 through which the center beam 6g and the side beams 6r, 6g pass.
01. The peripheral portion of the electron beam passage hole 201 has arc portions 201r and 201b each having a semicircle or more at both ends of the band portion 201g.
Are provided. Arc parts 201r, 201
The diameter b is substantially the same as the side beam passage holes 101r and 101b. Further, the positions of the center and the periphery of the arc portion 201r match the positions of the center and the periphery of the side beam passage hole 101r, and the positions of the center and the periphery of the arc portion 201b correspond to the center and the periphery of the side beam passage hole 101b. The auxiliary electrode 200 is fixed to the electrode 100 so as to coincide with the position of. That is, the circular arc portion 201r has the same diameter and the same concentricity as the side beam passage hole 101r.
b is the same diameter and concentric as the side beam passage hole 101b. The width (the dimension in the direction perpendicular to the in-line direction) of the band portion 201g is smaller than the diameter of the side beam passage holes 101r and 101g, and is equal to or longer than the major axis of the center beam passage hole 101g.

When the characteristics of the main electron lens (convergence of the main electron lens) are changed (shifted) from the desired characteristics due to the dimensional error of the electrode component, the second electron gun is inflated as shown in FIG. By providing the auxiliary electrode 200 on the chest electrode 51 of the five electrodes 50, it is possible to perform correction to increase the convergence of the main electron lens in the vertical direction (Y direction). Further, by providing the auxiliary electrode 200 on the chest electrode 61 of the sixth electrode 60 as in the in-line type electron gun of FIG. 1B, the correction for reducing the convergence force of the main electron lens in the vertical direction (Y direction) is performed. Becomes possible. By adding the auxiliary electrode 200 to the fifth electrode 50 or the sixth electrode 60 in this manner, changes in the electron lens characteristics (spot characteristics on the screen portion) due to dimensional errors of the electrode components constituting the main electron lens electrode structure. (Shift) can be corrected. Therefore, the main electron lens characteristic correction step is performed only by the step of adding the auxiliary electrode 200, and there is no need to correct the electrode component of the fifth electrode 50 or the sixth electrode 60 by precision press or the like.

The auxiliary electrode 200 is connected to the chest electrode 10 shown in FIG.
The assembling process for fixing the components 1 will be described below. In the electron beam passage hole 201 of the auxiliary electrode 200, arc portions 201r and 201b each having a semicircle or more have the same diameter as the side beam passage holes 101r and 101b of the chest electrode 101, respectively. Therefore, the diameter of the circular arc portion 201r, 201
b and the positioning pins 210 which are the same as or slightly smaller than the diameters of the side beam passage holes 101r and 101b.
By using (see FIG. 2), the auxiliary electrode 200 can be fixed to the chest electrode 101 by the following simple assembly process.

First, a positioning pin 210 is passed through the arc portion 201r of the auxiliary electrode 200 and the side beam passage hole 101r of the chest electrode 101, and another positioning pin 210 is also passed through the arc portion 201b and the side beam passage hole 101b. Then, the auxiliary electrode 200 is positioned with respect to the chest electrode 101. After that, the chest electrode 101
The auxiliary electrode 200 is fixed so as not to move, and the auxiliary electrode 200 is directly fixed to the chest electrode 101 by welding or the like.

The positioning pin 210 is also used as an assembly jig for positioning the chest electrode 101 in a conventional electron gun assembling process. Auxiliary electrode 200
Arc portions 201r and 201b of the electron beam passage hole 201 of FIG.
Is the side beam passage hole 101 of the chest electrode 101
r and 101b, the assembly jig conventionally used in the assembly process of the main electron lens electrode structure including the chest electrode 101 is replaced with the auxiliary electrode 200 by the chest electrode 101.
It can be used as it is in the assembly process for fixing it to Therefore, the auxiliary electrode 200 can be added to the chest electrode 101 by a simple assembly process as described above using a conventional assembly jig without creating a new assembly jig.

As described above, by providing the auxiliary electrode 200 to the chest electrode 101 constituting the main electron lens electrode structure and correcting the change in the main electron lens characteristic, the main electron lens characteristic can be simplified only by the above simple assembly process. Can be corrected. Further, since it is not necessary to correct the electrode parts by a precision press or the like, the problem of damaging the press die, which has occurred in the conventional electron lens characteristic correction step, does not occur.

The auxiliary electrode 2 is provided on the surface (second surface) of the chest electrode opposite to the surface on which the head electrode is provided (first surface).
Since 00 is provided, most of the electric field from the region where the head electrodes 52 and 62 face each other is blocked by the chest electrode. As a result, the correction error of the electron lens characteristic depending on the dimensional error of the auxiliary electrode 200 can be reduced, so that the problem of overcorrection that has occurred in the conventional electron lens characteristic correction process for correcting the chest electrode and the head electrode is solved. No longer occurs.

In an electrode such as the electrode 100 of FIG. 2 having a chest electrode and a head electrode, the center beam passage hole 101g is connected to the side beam passage holes 101r and 101r.
b, the difference between the convergence force in the in-line direction (X direction) and the convergence force in the vertical direction (Y direction) is large, so that the center beam passage hole 101g is vertically displaced from the side beam passage holes 101r, 101b. Is also an ellipse having a short major axis. For this reason, the center beam becomes more sensitive to the dimensional accuracy of the chest electrode 101 than the side beam. Therefore, the width (vertical dimension) of the band portion 201g corresponding to the center beam passage portion of the auxiliary electrode 200 is changed to the arc portion 201 corresponding to the side beam passage portion.
By making the diameter smaller than the diameters of r and 201b, the structure of the auxiliary electrode 200 exerts a stronger lens action on the center beam, whereby the center beam is more sensitive to the dimensional accuracy of the chest electrode 101 than the side beam. To compensate for it.

As described above, according to the embodiment of the present invention, when the main electron lens characteristic (spot characteristic on the screen) changes, the electron beam passage hole 201 through which the center beam and the side beam pass is provided. The periphery of the electron beam passage hole 201 is provided with arc portions 201r and 201b each having a semicircle or more at both ends of the band portion 201g, and the arc portions 201r and 201b are formed on the chest electrode 101.
(51 or 61) side beam passage holes 101r, 1
A substantially cylindrical auxiliary electrode 200, which has the same diameter and concentricity as that of the side electrode 01b and the width of the band portion 201g is smaller than the diameter of the side beam passage holes 101r and 101b, is connected to the chest electrode 101 (51).
Or 61) is added to the surface opposite to the surface on which the head electrode 102 (52 or 62) is provided, so that there is no need to create a new assembling jig, and there is no need for over-correction or pressing The above-mentioned change in the electronic lens characteristics can be easily corrected in a short time only by a simple assembling process without causing damage to the mold. Thereby, an appropriate spot diameter and resolution can be obtained on the screen unit.

In the above embodiment, an example was described in which an auxiliary electrode was provided on either the fifth electrode or the sixth electrode. However, in the in-line type electron gun of the present invention, the fifth electrode and the sixth electrode were provided with the auxiliary electrode. It is also possible to provide auxiliary electrodes respectively. Further, in the above embodiment, the auxiliary electrode is provided in the electrode structure formed by the chest electrode and the head electrode of the fifth electrode and the sixth electrode, but the electrode structure formed by the chest electrode and the head electrode of the other electrodes is provided. It is also possible to provide an auxiliary electrode to correct the electron lens characteristics.

[0036]

As described above, according to the present invention, there is no need to create a new assembling jig, and no over-correction or breakage of the press die occurs as in the prior art. A change in the electron lens characteristic (spot characteristic on the screen) can be easily corrected in a short time only by the process, and thereby an effect of obtaining an appropriate spot diameter and resolution on the screen can be obtained. .

According to the method for assembling an in-line type electron gun according to the third aspect of the present invention, the auxiliary electrode can be formed by a simple process using a conventional assembling jig without newly creating an assembling jig. There is an effect that it can be fixed to the chest electrode.

[Brief description of the drawings]

FIG. 1 is a sectional structural view of an in-line type electron gun according to an embodiment of the present invention.

FIG. 2 is a structural diagram of a fifth electrode or a sixth electrode provided with an auxiliary electrode of the in-line type electron gun of FIG. 1;

FIG. 3 is a sectional structural view of a color cathode ray tube.

FIG. 4 is a sectional structural view of a conventional in-line type electron gun.

FIG. 5 is a structural diagram of a fifth electrode or a sixth electrode of the in-line type electron gun of FIG. 4;

[Explanation of symbols]

50 fifth electrode, 51 fifth electrode chest electrode,
52 head electrode of fifth electrode, 60 sixth electrode, 6
1 chest electrode of sixth electrode, 62 head electrode of sixth electrode, 101 chest electrode, 101r, 101
b Side beam passage hole of chest electrode, 101g
Center beam passage hole of chest electrode, 102 head electrode, 200 auxiliary electrode, 201 electron beam passage hole of auxiliary electrode, 201r, 201b arc portion of electron beam passage hole, 201g band of electron beam passage hole,
210 Positioning pin.

Claims (4)

[Claims] 1. A substantially flat chest electrode having side beam passage holes on both sides of a center beam passage hole for passing a center beam, and a substantially cylinder fixed to a first surface of the chest electrode. And an auxiliary electrode for correcting an electron lens characteristic by directly fixing to the second surface of the chest electrode of an in-line type electron gun having an electron lens electrode structure having a center beam and a side electrode. A single electron beam passage hole through which a beam passes; a periphery of the electron beam passage hole is provided with a semicircle or more arc at each end of the band; An auxiliary electrode for an in-line type electron gun, wherein the auxiliary electrode has the same diameter and concentricity as the beam passage hole, and the width of the band portion is smaller than the diameter of the side beam passage hole. 2. The first chest electrode of a substantially flat first chest electrode having side beam passage holes for passing side beams on both sides of a center beam passage hole for passing a center beam.
And a first head electrode having a substantially cylindrical shape fixed to the surface of the second chest electrode and a substantially flat second chest electrode having the side beam passage holes provided on both sides of the center beam passage hole. In an in-line type electron gun having an electron lens electrode structure in which a substantially cylindrical second head electrode is disposed so as to face the first head electrode and / or the second chest electrode, the second surface is provided on one or both of the first and second chest electrodes. An in-line type electron gun, wherein the auxiliary electrode according to claim 1 is directly fixed. 3. The method of assembling an in-line type electron gun according to claim 2, wherein a positioning pin is passed through the arc portion of the auxiliary electrode and the side beam passage hole of the chest electrode. Wherein the auxiliary electrode is fixed to the chest electrode after the auxiliary electrode is positioned. 4. The first chest electrode of a substantially flat plate-shaped first chest electrode having side beam passage holes for passing side beams on both sides of a center beam passage hole for passing a center beam.
And a first head electrode having a substantially cylindrical shape fixed to the surface of the second chest electrode and a substantially flat second chest electrode having the side beam passage holes provided on both sides of the center beam passage hole. A method for correcting an electron lens characteristic of an in-line type electron gun having an electron lens electrode structure in which a substantially cylindrical second head electrode is disposed so as to face the electron head, wherein the electron lens characteristic is changed from a desired characteristic. In this case, by fixing the auxiliary electrode according to claim 1 to the second surface of one or both of the first chest electrode and the second chest electrode, the electron lens characteristics can be changed to the desired characteristics. A method of correcting an electron lens of an in-line type electron gun, wherein the correction is performed in the following manner.