JPH04137340A - Electron gun for cathode ray tube - Google Patents

Abstract

PURPOSE:To reduce variations in characteristics due to heat generation of a metallic member by making the resistant value of a part facing a metallic member, of the resistance pattern of a resistor, relatively smaller than the resistant value of other parts. CONSTITUTION:In an electron gun, a resistor 30 extending from the side of a cathode K to the side surface of a convergence cup C is arranged along the back surface of one side insulating support 11. Furthermore, a linear metal member 13 is annularly attached to the third grid G3 just like hemming a pair of insulating support 11 and the resistor 30. The resistance pattern 33 of the resistor 30 is composed of a high resistance part 38 and a low resistance part 39 which is formed in a position facing the metal member 13. Even if the metal member 13 is heated by high frequency heating, the resistance value of the part facing the metal member 13 changes only a little, variation in a resistance division ratio can be made remarkably small, and the third and the fourth grids G3 and G4 can be provided with their set voltages, respectively.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to an electron gun for cathode ray tubes such as color picture tubes, and particularly relates to an electron gun for cathode ray tubes such as color picture tubes, and in particular, an electron gun for dividing an anode high voltage by resistance and supplying it to a predetermined electrode. The present invention relates to an electron gun for a cathode ray tube having a resistor for use in a cathode ray tube.

(Prior art) Generally, a color picture tube has a panel of
and has an envelope consisting of a funnel ■ integrally joined to this panel ■, and a phosphor screen ■ consisting of a three-color phosphor layer that emits blue, green, and red light is formed on the inner surface of the panel ■, A shadow mask (A) having a large number of electron beam passage holes formed inside thereof is arranged opposite to this phosphor screen (A). In addition, there are 3 electron beams (6B), (6G), (
An electron gun (2) that emits 6R) is installed.

This electron gun ■ has three cathodes, controls the emission of electrons from these cathodes, accelerates and focuses them, and produces an electron beam (6B).
, (6G), (6R), and an electrode that accelerates and focuses the electron beams (6B), (6G), (6R) toward the phosphor screen (3). In addition to electrodes to which an anode high voltage of about 25 to 30 kV is applied, a focusing voltage of 5 to 8 kV is applied to the electrodes that accelerate and focus toward the phosphor screen ■.
There is an electrode to which a medium voltage of about V is applied.

Normally, the voltage of each electrode of this electron gun (2) is determined by the following: Except for the electrode to which the high voltage is applied to the anode, the other electrodes are equipped with a plurality of stem pins that hermetically pass through the stem (0) that seals the neck (1) end. ■Supplied via. However, if the voltage supplied via the stem pin (■) contains a relatively high medium voltage like the above-mentioned focused voltage, the spacing between the stem pins 0 and 0 is narrow, so the voltage supplied through the stem pin (8) and the stem pin (■) The withstand voltage of the socket to be connected becomes a problem, and the structure of the socket in particular becomes complicated.

Therefore, means for obtaining a predetermined intermediate voltage by arranging a resistor in the envelope and dividing the anode high voltage by this resistor are disclosed in Utility Model Application Publication No. 48-21561 and Utility Model Application No. 55-38.
No. 484, US Pat. No. 3,932,786, and US Pat. No. 4,143,298. The resistor placement is placed within a small space within the neck due to lack of adequate space within the envelope.

FIG. 7 shows an example of an electron gun in which the resistor described above is arranged.

This electron gun is an in-line color picture tube electron gun that emits three electron beams arranged in a row, consisting of a center beam and a pair of side beams that pass on the same plane.
- three cathodes (K) in a row arrangement, each cathode (K
), three heaters (H) interpolated in the cathode (K
), the first to fifth grids (G1) are arranged in sequence toward the phosphor screen, and have a unified structure (unitized structure) in which three electron beam passing holes corresponding to the three cathodes (K) are formed. ~ (G5) and the convergence cup (C) fixed to its fifth grid (G5)
has a heater (H), a cathode (K) and a first
The fifth to fifth grids (G1) to (G5) are integrally fixed by a pair of insulating supports (11). In particular, the electron gun of this illustrated example has a long third grid (G3) and a short fourth grid (G4), so that a gentle potential gradient is created between the third grid (G3) and the fifth grid (G5). It is formed in a structure that forms a long focus electron lens.

Then, along the back side of one insulating support (11), a resistance I! (12) is placed. In addition, a linear metal member (13) is attached to the third grid (G3) so as to surround the pair of insulating supports (11) and the resistor (12) arranged on the back side of one of the insulating supports (11). are installed in a ring.

This linear metal member (13) is partially evaporated by high-frequency heating in the color picture tube manufacturing process, and a vapor-deposited film ( 14) to shield the high potential electric field, stabilize the electric field near the electron gun, and improve the withstand voltage.

In this electron gun, (15) is welded and fixed to the convergence cup (C), and the tip is pressed against the internal conductive film (16) that is applied to the inner surface of the funnel and extends to the adjacent part of the inner surface of the neck. The anode high voltage supplied to the anode terminal provided in the funnel is passed through its internal conductive film (16
) and a valve spacer that communicates to the fifth grid (G5) via the convergence cup (C).

By the way, as shown in FIG. 8, the resistor (12) is formed to have a length of 60+m+, a width of 5.0++++a, and a thickness of 1.0mm, for example, and is connected to the convergence cup from the cathode (K) side of the electron gun. (C) an insulating substrate (17) extending up to the side surface of the insulating substrate (17); and a resistance pattern (about 2000 MΩ) formed by coating a mixture of ruthenium oxide and glass powder in a meandering manner on one side of the insulating substrate (17). 18) and
A thin insulating layer (19) made of glass with a thickness of about 50 to 200 mm covers this resistance pattern (18), and a through hole (20) provided at a predetermined position in the insulating substrate (17).
and a voltage extraction terminal part (22) formed on one surface of the insulating substrate (17) and connected to the resistor pattern (18), which is made of a resistive member of about Ω and whose main component is ruthenium oxide; It is comprised of a connecting piece (23) such as an eyelet that is crimped and fixed in the through hole (20) by caulking or other methods and connected to the voltage extraction terminal part (22).

This resistor (12) is connected to the voltage extraction terminal section (2
2) by a connecting wire (24) welded to the connecting piece (23).

One end side is connected to the convergence cup (C), the other end side is connected to the stem pin 0, and the middle part is connected to the third and fourth grids (G3) and (G4), and the anode terminal, the internal conductive film (16) , the fifth grid (G5) via the valve spacer (15) and convergence cup (C).
) is resistance-divided by the resistance pattern (18), and the anode high voltage of about 25 to 30 kV supplied to A voltage of approximately 6 kV is supplied to the grid (G3).

Therefore, this electron gun eliminates the need for the stem pin that was conventionally required to supply a predetermined voltage to the third and fourth grids, improving withstand voltage characteristics and simplifying the circuit configuration. can do.

However, as mentioned above, in the manufacturing process of color picture tubes, this electron gun uses high-frequency heating to produce metal members (13
) is evaporated and deposited on the inner surface of the neck, etc., the heat generated by this metal 1 member (13) causes the resistor (12) to evaporate.
heats up, causing a local change in the resistance near it, which changes the resistance divider ratio and increases the resistance of the third and fourth grids (G3).
), (G4), and the beam spot diameter on the phosphor screen deteriorates.

Figures 9(a) and 9(b) show the voltage extraction terminal section (22
) is a diagram showing the relationship between the resistance division ratio and the resistance value distribution of a resistor (12) having resistance values R1, R2, and R3 divided into three by In some cases. The solid line (25) shown in (a) is the resistance value distribution (and resistance value) before the metal member is heated by heat generation, and the broken line (26) is the resistance value distribution (and resistance value) after heating. be.

The resistor (12) in this example has a length of 60 cm, a width of 5.0 mm,
Alumina ceramic insulating substrate (17) with a thickness of 1.0m
A resistive pattern (18) with a specific resistance of 7.0Ω and an opening is formed in a serpentine shape with a cross-sectional area of 35 x 10-'d on one side of the The resistance division ratios El and E2 at the two intermediate voltage output terminals (22) are E1=25% and E2=50%, respectively.Furthermore, as shown in FIG.
Resistance value r21 obtained by subdividing the partial resistance pattern (18)
．． r22. r23 is as follows: r21 = 180MΩ r22 = 120MΩ r23 = 200MΩ. Then, when the metal member located above the r22 part is heated by heat generation, the r22 part decreases by about 42%, becoming r22 = 70MΩ, and the resistance division ratio El at the two intermediate voltage extraction terminal parts (22) , E2 are respectively E l = (500/1950) x 100=25
．． 6%E 2 = ((500+450)/1950)
X100=48.7%.

In other words, when the resistor in this example is heated by the heat generated by the metal member, R2 becomes smaller, and the resistance division ratio E1 at one of the intermediate voltage extraction terminals (22) changes from 25% to 25%.
．． 6%, and when the anode high voltage is 25kV, 6.25
The voltage supplied to the third grid increases by 150V from kV to 6.40kV. In addition, the resistance division ratio E2 at the other voltage extraction terminal section (22) in the middle changes from 50% to 48.7%, and the voltage supplied to the fourth grid is
The voltage decreases by about 300v from 12.5kV to 12.2kV. As a result, the characteristics of the electron gun are significantly impaired.

(Problems to be Solved by the Invention) As mentioned above, in order to improve the withstand voltage of the stem and the socket connected to the stem pin,
A resistor is placed along the back of the insulation support that fixes each electrode such as the heater, cathode, and grid of the electron gun together, and this resistor divides the anode high voltage to produce a relatively high medium voltage. Along with supplying it to a predetermined electrode.

In order to stabilize the electric field near the electron gun and improve the withstand voltage, a linear metal member is placed around the insulating support and the resistor on the electrode located closer to the cathode than the electrode to which high voltage is applied to the anode. There is an electron gun that heats this metal member to evaporate a portion of it during the installation and cathode ray tube manufacturing process to form a vapor deposited film on the inner surface of the neck, resistor, insulating support, etc. However, in such an electron gun, the resistor is heated by the heat generated by the metal member when forming the vapor deposited film, and the resistance value near the metal member changes locally, causing a change in the resistance division ratio. Therefore, there is a problem that a predetermined voltage cannot be supplied to a predetermined electrode, and the characteristics of the electron gun are impaired. This invention was made to solve the above problems, and even if the resistance value of the resistor changes locally due to heat generation of the metal member, the change in the resistance division ratio and the total resistance of the resistor can be prevented. The purpose is to minimize the amount so that it does not affect the characteristics of the electron gun.

[Structure of the invention]

(Means for Solving the Problem) A cathode, an electrode that controls electron emission from the cathode and accelerates and focuses it to form an electron beam, and an electrode to which at least an anode high voltage is applied to accelerate and focus the electron beam. an insulating support for fixing the cathode and the plurality of electrodes together; and a resistance pattern disposed along the insulating support and having a predetermined resistance value. a resistor for resistively dividing a high voltage to supply a predetermined voltage to at least one of the plurality of electrodes; and a resistor for preventing the influence of an electric field formed by the electrode to which the anode voltage is applied. In a cathode ray tube electron gun having a metal member connected to a predetermined electrode of the plurality of electrodes and surrounding the insulating support and the resistor, a portion of the resistance pattern of the resistor that faces the metal member. The resistance value of the part is made relatively smaller than the resistance value of other parts.

(Function) According to the research conducted by the present inventors, it has been found that the rate of change in resistance value due to heating becomes smaller as the resistivity value of the resistance pattern becomes smaller. Methods for reducing the specific resistance value of this resistor pattern include reducing the specific resistance value of the resistor material that makes up the resistor pattern, as well as partially increasing the length of the resistor pattern and partially reducing the cross-sectional area. There are several methods for reducing the resistance value, but any of these methods can reduce the rate of change in the resistance value of the resistor pattern.

Therefore, as described above, by forming one part of the resistance pattern of the resistor so that the resistance value of the part facing the insulating support and the metal member surrounding the resistor is relatively smaller than the resistance value of the other part. Therefore, the rate of change in resistance value can be reduced, and the resistance division ratio, which is most important for the amount of resistance that divides the anode high voltage and supplies a predetermined voltage, can be prevented from changing.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 1 shows an in-line type color picture tube electron gun, which is an embodiment of the present invention. This electron gun consists of three cathodes (K) arranged in a row, three heaters (H) inserted into each cathode (K), and arranged sequentially from the cathode (K) toward the phosphor screen. The first to fifth grids (G1) to (G5) of integrated structure and the fifth grid (G
5), the heater (H), cathode (K) and first to fifth grids (G1) to (G5) are connected to a pair of insulating supports (1).
1), they are fixed together. Three electron beam passing holes corresponding to the three cathodes (K) are formed in the first to fifth grids (G1) to (G5) and the convergence cup (C).

In this electron gun, the cathode (K) and the first to fifth grids (G1) to (G5) control the emission of electrons from the cathode (K), and accelerate and focus the emitted electrons to form an electron beam. The third to fifth grids (G3) to (G5) constitute a main electron lens section that accelerates and focuses the electron beam onto the phosphor screen. In particular, this electron gun has a structure in which the third grid (G3) constituting the main electron lens portion is formed long and the fourth grid (G4) is formed short to form a long focus electron lens with a gentle potential gradient. It has become.

The electron gun also includes a resistor (30) extending along one back surface of the insulating support (11) from the cathode (K) side to the side surface of the convergence cup (C).
is located. Further, the third grid (G3) includes the pair of insulating supports (11) and the resistor (30).
A linear metal member (13) is attached in an annular manner so as to surround it.

As shown in FIGS. 2 and 3, the resistor (30) has an insulating substrate (32) made of alumina ceramic or the like.
, a resistance pattern (33) coated on one surface of this insulating substrate (32), and this resistance pattern (33).
a thin insulating coating layer (34) made of glass that covers the
A through hole (
35) and a voltage extraction terminal section (35) formed on one surface of the insulating substrate (32) and connected to the high-resistance section (33), which is made of a low-resistance material of approximately 100 Ω and whose main component is ruthenium oxide. 36), and the voltage extraction terminal portion (36) is crimped and fixed to the through hole (35) by caulking or other methods.
It consists of a connecting piece (37) such as an eyelet that is connected to the connecting piece (37).

In particular, the resistor (30) in this example has a resistor pattern (33)
A high-resistance part (which is formed by coating a high-resistance material mainly composed of ruthenium oxide and glass powder in a meandering shape with a predetermined cross-sectional area)
38), and a low-resistance portion (39) formed by coating to have a larger cross-sectional area than the high-resistance portion (38) at a position facing the linear metal member (13).

The connection wire (40) welded to the connection piece (37) of the voltage extraction terminal (36) connects one end to the convergence cup (C), the other end to the stem pin (■), and the middle part to the convergence cup (C). Third and fourth grids (G3).

(G4), the anode terminal, the internal conductive film (16
), the anode high voltage of about 25 to 30 kV is supplied to the fifth grid (G5) via the valve spacer (15) and convergence cup (C) through the resistor pattern (33
) to divide the resistance into two intermediate voltage output terminals (36) 7! l' and 4th grid (G4) approximately 12kV
, a voltage of approximately 6 kV is supplied to the third grid (G3).

Specifically, the resistance pattern (33
) is length 60 x 1 width 5. On one side of an insulating substrate (32) made of alumina ceramic or the like with a thickness of 1.01 Ω, a high-resistance member with a specific resistance of 7.0 Ω and made of ruthenium oxide and glass powder as main components is installed with a cross-sectional area of about 35 Ω. ×10′″
A high-resistance part (38) formed by coating in a meandering shape of 'cd' and a resistor formed by coating the same high-resistance member at a position facing the linear metal member (13) with a cross-sectional area of approximately 14 x 10-'' cd. (39), and each voltage extraction terminal part (36).
), the resistance values R1, R2, and R3 between Rl = 1000MΩ R2 = 500MΩ R3 = 500MΩ, and the resistance division ratios El and E2 at the two middle voltage output terminals (36) are respectively E1 = 25% E2 =50%. Further, the resistance pattern (33) of the R2 portion is subdivided into a resistance value r21. r22
°r23 is as follows (see FIG. 11): r21 = 200MΩ r22 = 50MΩ r23 = 250MΩ.

Such a resistor (30) is manufactured by applying a high-resistance material mainly composed of ruthenium oxide and glass powder in a serpentine shape onto one surface of an insulating substrate (32) by a method such as screen printing. (38), and at the same time, apply the same high-resistance member with a larger cross-sectional area than the high-resistance part (38) at a position facing the linear metal member (13) to form a resistance part (39). Also, a low resistance material containing ruthenium oxide as a main component is applied in a predetermined shape around the through hole (35) provided in the insulating substrate (32) by a method such as screen printing.Then, after drying, 7
The resistance pattern (33
) and a voltage extraction terminal portion (36) are formed. next,
A paste containing lead oxide glass powder as a main component is applied onto this insulating substrate (32) by the same method such as screen printing, dried, and then fired at a temperature of approximately 500 to 700°C. ) to coat the resistive pattern (33) formed on it. Thereafter, a connecting piece (37) such as an eyelet is attached to the first through hole (35), and the connecting piece (37) is connected to the voltage extraction terminal part (36).

By the way, if the resistor (30) is configured as described above,
Even if the metal member (13) is heated by high frequency heating and a part of it is evaporated, the resistance value of the r22 portion facing this metal member (13) changes only slightly. Changes in the division ratios El and E2 can be significantly reduced.

For example, regarding the above specific example, metal member (13)
By heating, the resistance value of the part facing the metal member (13), which was r22 = 50 MΩ before heating, becomes
After heating, r22 = 35MΩ, which is a decrease of about 30%, but the total resistance RT of the resistor (30) becomes RT = 1985MΩ, and the resistance division ratio El at the two intermediate voltage extraction terminals (22) is E2 respectively E 1 = (500/1985) x 100 = 2
5.2%E 2 = ((500+485)/1985
) X100=49.6%, and the resistance division ratios El and E2 could be significantly reduced compared to conventional resistors.

Therefore, if such a resistor (30) is placed,
A predetermined electrode of the electron gun, that is, the third electrode in this example electron gun.
By supplying predetermined voltages to the fourth grids (G3) and (G4), respectively, it is possible to obtain an electron gun whose characteristics are not impaired.

The reason why such excellent effects can be obtained can be explained as follows.

That is, the specific resistance of a resistance member containing ruthenium oxide as a main component depends on the firing temperature, and the specific resistance value tends to decrease as the firing temperature increases.

Therefore, the resistor (30) has a resistance pattern (33) formed of a resistance member mainly composed of ruthenium oxide.
is locally heated by the heat generated by the metal member (13),
The resistance value of that part changes. However, as a result of research conducted by the present inventors, it has been found that the change in resistance value in this case decreases in some cases and increases in others.

There are still many unknowns regarding the change in resistance value of this resistor (30), but regarding the decrease in resistance value.

By re-firing the high-resistance material at a temperature higher than the firing temperature during resistor manufacturing, the dispersion direction of the ruthenium oxide molecules and reduced ruthenium molecules responsible for electrical conduction in the high-resistance material is aligned with the direction of current flow. This is thought to be because the potential energy within the high-resistance member, which is rearranged and exhibits macroscopic electrical resistance, changes. Also, regarding the increase in resistance value,
The softening temperature of the glass constituting the insulation coating layer (34) is 40
Since the temperature is 0 to 500°C, it is thought that the glass of the insulating coating layer (34) diffuses into the resistance pattern (33) due to the heat generated by the metal member (13), increasing the specific resistance of the high-resistance member. It will be done. In reality, since these two phenomena occur simultaneously, the change in the resistance value of the resistor (30) may decrease or increase.

What influences this is the heating temperature and heating time for the resistor (30).

On the other hand, according to the results of research conducted by the present inventors, it has been found that the rate of change in resistance value due to reheating decreases as the specific resistance value decreases. Therefore, in a member that contains a large amount of electrically conductive substances such as ruthenium oxide molecules and ruthenium molecules that play a role in electrical conduction, even if the direction of dispersion and arrangement of molecules changes slightly, the change in specific resistance value is extremely small, and the insulating coating layer (34)
It has been found that even if the glass constituting the resistor pattern (33) is diffused into the resistor pattern (33), the change in the specific resistance value is extremely small.

Therefore, when considering the resistance value of the R2 portion where the linear metal member (13) is located, (see Fig. 11) r21.
r22. Let each specific resistance of the r23 part be ρ21. ρ2
2゜ρ23, each cross-sectional area s21. s22. s23,
The length of each straight line along the resistance pattern is Q21. Q22.
Q23, each length L21 of the resistance pattern. L22.
When L23, R2= r21+ r22+ r2
It becomes 3.

Now, if we assume that the r22 part of the R2 part is locally heated most significantly due to the heat generated by the linear metal member, the resulting change in the resistance value of the R2 part is reduced to a predetermined resistance. In order to maintain the value, it is sufficient to reduce r22 and increase r21 and r23 by that amount.

Therefore, as described above, by forming the resistance pattern (33) with a low resistance part (39) having a larger cross-sectional area than the high resistance part (38) at a position facing the linear metal member (13), , to reduce the change in the overall resistance value, and to reduce the resistance division ratio El at the intermediate voltage extraction terminal section (36).
, E2 can be reduced.

In addition, in the above embodiment, r2 facing the linear metal member
In order to reduce the resistance value of the 2 parts, the r21 part and r2
Although the cross-sectional area is larger than that of the high-resistance parts such as the 3 part, there are other ways to form this low-resistance part, in addition to increasing the cross-sectional area, forming it with a resistance material with low specific resistance, and forming it with a resistance pattern. There are methods of shortening the length or methods of combining them.

As an example, FIG. 4 shows a meandering resistance pattern (3
3) is formed into a straight line to form a short low resistance part (39), and FIG. ), the low resistance part (39) is formed in almost the same pattern as the resistor of the previous embodiment, and the same effect as the resistor of the previous embodiment can be obtained.

Further, in the above embodiment, a resistor whose main component is ruthenium oxide has been described, but the present invention can be similarly applied to a resistor whose resistance value changes by heating.

Furthermore, in the above embodiments, an in-line color picture tube electron gun has been described, but the present invention can be applied not only to other color picture tube electron guns but also to other cathode ray tube electron guns. Effects of the Invention] A plurality of electrodes including a cathode, an electrode that controls and accelerates and focuses electron emission from the cathode to form an electron beam, and an electrode to which at least an anode high voltage is applied to accelerate and focus the electron beam. an insulating support for fixing the cathode and a plurality of electrodes together, and a resistance pattern disposed along the insulating support and having a predetermined resistance value, and this resistance pattern resists the high voltage of the anode. A resistor for dividing and supplying a predetermined voltage to at least one of the plurality of electrodes, and an electrode for preventing the influence of the electric field formed by the electrode to which the high voltage is applied to the plurality of electrodes. In a cathode ray tube electron gun having a metal member connected to a predetermined electrode of the electrodes and surrounding the insulating support and the resistor, a portion of the resistance pattern of the resistor facing the metal member is provided. If the resistance value is made relatively smaller than the resistance value of other parts, even if the resistor is locally heated due to the heat generated by the metal member.

Changes in the resistance division ratio at the intermediate voltage extraction terminal portion for extracting a predetermined voltage to be supplied to a predetermined electrode can be made extremely small, and an electron gun with small changes in characteristics can be constructed.

[Brief explanation of drawings]

1 to 5 are detailed explanatory diagrams of the present invention, and FIGS. 1(a) and 1(b) are a perspective view and a front view, respectively, showing the configuration of an in-line color picture tube electron gun, which is an embodiment thereof. 2 is a front view showing the structure of the resistor, and FIG. 3 is a perspective view showing the structure of the resistor in an exploded manner.
4 and 5 respectively show other configurations of the resistor, FIG. 6 shows the structure of the color picture tube, FIG. 7 shows the structure of the electron gun, and FIG. 8 shows the structure of the color picture tube. 9(a) and 9(b) are diagrams showing changes in the resistance division ratio of the resistor in comparison with the resistor, and FIG. 10 is a diagram showing the resistance division ratio of the resistor. FIG. 3 is an enlarged view of main parts. 9... Stem pin 11... Insulating board 13...
・Metal member 15... Valve spacer 30...
・Resistor 32...Insulating substrate 33...Resistance pattern 34...Insulating coating layer 35...Through hole
36... Voltage extraction terminal part 37... Connection piece 38... High resistance part 39... Low resistance part
40...Connection C...Convergence cup G1...First grid G2...Second grid G
3...Third grid G4...Fourth grid G5
...5th grid H...Heater K...Cathode agent Patent attorney Norihiro Ogo

Claims (1)

[Claims] A plurality of electrodes including a cathode, an electrode for controlling and accelerating and focusing electron emission from the cathode to form an electron beam, and an electrode to which at least an anode high voltage is applied for accelerating and focusing the electron beam. an insulating support for fixing the cathode and the plurality of electrodes together, and a resistor pattern disposed along the insulating support and having a predetermined resistance value, and this resistor pattern applies a high voltage to the anode. a resistor for dividing the resistance and supplying a predetermined voltage to at least one of the plurality of electrodes; and a resistor for dividing the resistance and supplying a predetermined voltage to at least one of the plurality of electrodes, and a resistor for preventing the influence of an electric field formed by the electrode to which the anode voltage is applied. In a cathode ray tube electron gun, the resistance pattern of the resistor has a resistance value of a portion facing the metal member different from the resistance value of the resistance pattern of the resistor. An electron gun for a cathode ray tube, characterized in that the resistance value is relatively smaller than the resistance value of the part.