JPH11102649A - Electron gun, resistor and terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of resistors even at withstand voltage processing time, and provide stable operation by arranging a second grid dischargeable from a resistor in the vicinity of a first grid to which electric power is supplied from the voltage dividing resistor arranged in a tube of an electron gun. SOLUTION: Plural electrodes and resistors are respectively printed and baked on an insulating substrate 20, and a voltage dividing resistor forming an insulating layer is incorporated into a neck part of a color cathode-ray tube together with an electron gun. At this time, a distance B between a projection 27 of the electrode end 28 on which a maximum width A is set to 0.6 to 1.4 mm and an angle formed by the projection 27 is set to 40 to 60 deg. and a sixth grid electrode G6 having the same electric potential as the earth, is set to 0.5 to 1.5 mm, and it is arranged in close vicinity to G6. Therefore, even if high voltage is impressed at withstand voltage processing time, the high voltage applied to the resistor is discharged, and stable operation can be guaranteed by preventing the occurrence of a resistance value change and disconnection since a resistor is damaged when discharge is generated by a difference between electric potential of a metallic evaporation film formed on an insulating layer at manufacturing time and electric potential of the resistor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electron gun, a resistor, and a terminal.

[0002]

2. Description of the Related Art In an electron tube, for example, a color CRT used in a color television receiver, a high voltage to be supplied to a convergence electrode, a focus electrode and the like is required in addition to an anode voltage. At this time, if a high voltage is supplied from the stem portion of the color cathode ray tube, a problem arises in terms of withstand voltage.Therefore, a resistor for voltage division is installed in the color cathode ray tube together with an electron gun, and the anode voltage is divided by the resistor to divide the anode voltage. A method of supplying a high voltage to the electrode has been devised. That is, as shown in FIG. 4, a color CRT adopting the above-described method is composed of a panel 1 and a funnel 2.
A phosphor screen 3 composed of a three-color phosphor layer that emits blue, green, or red light is formed on the inner surface of the panel 1, and an inner side is formed so as to face the phosphor screen 3. Is provided with a shadow mask 4 having a large number of electron beam passage holes. On the other hand, an electron gun 7 that emits three electron beams 6B, 6G, and 6R is disposed in the neck 5 of the funnel 2, and the three electron beams 6B, 6G, and 6R that are emitted from the electron gun 7 are transmitted to the funnel 2. The fluorescent screen 3 is horizontally and vertically scanned by being deflected by a magnetic field generated by a deflection yoke 8 mounted on the outside, thereby displaying a color image.

[0005] The electron gun 7 is configured, for example, as shown in FIG. Here, FIG. 5A is a perspective view of the electron gun 7 disposed in the neck 5 of the funnel 2, and FIG. 5B is a view taken along the line CC ′ shown in FIG. FIG. 4 is a cross-sectional view when the electron gun 7 arranged in the neck 5 of the funnel 2 is cut along the same. As shown in FIG. 5B, the electron gun 7 arranged in the neck 5 functioning as a vacuum vessel has three cathodes K (here, three cathodes K).
(Only one is shown) with respect to common first grid electrode G1, second grid electrode G2, third grid electrode G
3, fourth grid electrode G4, fifth grid electrode G5, sixth grid electrode G6, seventh grid electrode G7, and eighth grid electrode G7.
The grid electrodes G8 are sequentially arranged coaxially, and a convergence electrode 9 is arranged downstream of the eighth grid electrode G8. Each grid electrode Gl, G2, G3, G4,
G5, G6, G7 and G8 are mechanically held by bead glass 10 so as to maintain a predetermined positional relationship with each other. Further, the third grid electrode G3 and the fifth grid electrode G5 are electrically connected by the conducting wire 11, and the convergence electrode 9 is electrically connected to the eighth grid electrode G8 by welding. Also, terminals 13a and 13b provided on the resistor 12
Are connected to the seventh grid electrode G7 and the fifth grid electrode G5, respectively, the terminal 14 is connected to the convergence electrode 9, and the ground terminal 15 is connected to the ground electrode pin 16. On the other hand, a graphite conductive film 17 extending to the inner wall of the neck 5 is provided on the inner wall of the funnel 2.
The anode voltage is supplied through a high voltage supply button (not shown) provided on the funnel 2. When the conductive spring 18 provided on the convergence electrode 9 comes into contact with the graphite conductive film 17, an anode voltage is supplied to the convergence electrode 9, the eighth grid electrode G8, and the terminal 14, and a voltage generated at the terminals 13a and 13b is generated. The compressed voltage is supplied to the seventh grid electrode G7 and the fifth grid electrode G5, respectively.
The metal ring 19 (the middle grid electrode is omitted) shown in FIG. 5A is used to stabilize the potential distribution in the neck 5 so that the bead glass 10 and the resistor 10 The metal ring 19 is provided so as to surround the periphery of the vessel 12, and a metal film 19 is heated by high-frequency heating or the like to form a vapor deposition film (not shown in the drawing) on the inner wall of the neck 5.

Here, the resistor 14 is configured, for example, as shown in FIG. That is, for example, electrodes 21a-21d formed by printing, drying and firing a material containing a metal oxide containing ruthenium oxide and lead borosilicate glass on the insulating substrate 20 made of aluminum oxide or the like. And terminals 22a to 22d are formed, and between each terminal, that is, RA,
A resistor 23 formed by printing, drying and firing a material containing a metal oxide containing ruthenium oxide and a glass containing lead borosilicate into a shape having a predetermined resistance value is arranged between RB and RC. Have been. Further, an insulating layer 24 is formed so as to cover the resistor 23 and a part of the electrodes 21a to 21d, and the terminals 22a to 22d are caulked in regions of the electrodes 21a to 21d which are exposed without being covered by the insulating layer 24. Have been. FIG. 6A shows a state in which the resistor 12 is seen through from the insulating layer side. FIG. 6B shows A-
FIG. 6C is a cross-sectional view taken along the line A ′, and FIG. 6C is an enlarged view of a cross-section near a connecting portion (caulking portion) between the electrode 21a and the terminal 22a.

[0005]

By the way, the above-mentioned resistor must be stable during the process of resisting or heating during the manufacturing process of a color cathode ray tube or the like, and must have Joule heat generated during the operation of the color cathode ray tube or the like. Change of resistance and gas emission are hardly recognized by scattered electrons, it does not become a secondary electron emission source when scattered electrons collide, it disturbs the electric field part of the electron gun and shifts the discharge or electron trajectory. Conditions such as not being required are required.

Generally, in an electron tube to which a high voltage is applied, in order to improve the withstand voltage characteristic, a high voltage having a peak voltage of about two to three times the normal operating voltage is applied after the exhaust in the manufacturing process. In addition, withstand voltage processing is performed to remove burrs, deposits, and the like on the electrodes of the electron gun that cause a decrease in withstand voltage due to forced discharge.

However, the withstand voltage processing is performed by the resistor 1
2, for example, a color cathode ray tube, a vapor film formed on the insulating layer 24 of the resistor 12 by the vapor generated from the metal ring 19 shown in FIG. Discharge occurs due to the potential difference between the film potential and the resistor 23, and a voltage that is two to three times that in normal operation is applied from the high-voltage side terminal 21d of the resistor 12 by the discharge. There was a problem of inviting disconnection.

Further, if the resistor 23 is damaged, a predetermined resistance value cannot be obtained in the resistor 23. Therefore, the anode voltage is divided by the resistor and a predetermined high voltage is applied to each electrode. There has been a problem that the voltage cannot be supplied stably and an operation failure of the electron gun occurs. Furthermore, when the resistor 23 is disconnected, the anode voltage cannot be divided by the resistor, and the function of the electron gun stops. Furthermore, in an electron tube equipped with an electron gun that has malfunctioned or stopped functioning, a predetermined operation cannot be achieved.For example, in the case of a color cathode ray tube, an image display becomes unstable or an image is formed. There was a problem that it disappeared.

The present invention has been made in view of the above conventional example, and provides an electron gun having stable operation and excellent reliability even when a high voltage is applied by performing withstand voltage processing or the like. The purpose is to provide.

Further, the present invention can prevent a resistor from being damaged or disconnected even when a high voltage is applied by performing a withstand voltage process or the like, and can suppress a change in the resistance value of the resistor. It is an object to provide a resistor excellent in performance.

Further, according to the present invention, even in the case where a high voltage is applied by performing a withstand voltage treatment or the like, the resistor is prevented from being damaged or disconnected, and the fluctuation of the resistance value of the resistor is suppressed. It is an object of the present invention to provide a terminal which realizes a resistor having excellent resistance.

[0012]

An electron gun according to the present invention comprises:
It comprises a resistor, a first grid fed from the resistor, and a second grid disposed near the first grid and discharged from the resistor. .

According to the electron gun of the present invention, the second grid discharged from the resistor is provided in the vicinity of the first grid fed from the resistor. Since a current can flow, a stable operation can be guaranteed even when a high voltage is applied by performing a withstand voltage process or the like.

Further, according to the electron gun of the present invention, power is supplied through a resistor provided with a plurality of electrodes, a metal wire provided near the resistor, and an electrode provided near the metal wire. And a second grid disposed near the first grid and discharged through the electrode.

According to the electron gun of the present invention, the second grid discharged through the electrode is provided in the vicinity of the first grid fed through the electrode provided near the metal wire. Since the current can flow through the second grid, a stable operation can be guaranteed even when a high voltage is applied by performing a withstand voltage process or the like.

Further, the resistor according to the present invention is a resistor provided on an electron gun having a plurality of grids, wherein the resistor is provided on the insulating substrate, the resistor provided on the insulating substrate, and the resistor connected to the resistor. And the insulating layer that covers the resistor and the electrode so as to secure a connection region for the electrode, and supplies power to the first grid from the connection region and discharges to the second grid. And a terminal.

According to the resistor according to the present invention, power is supplied to the first grid from the connection area secured in the electrode, and the second grid is connected to the second grid.
By providing a discharge terminal on the grid of the above, when an excessively high voltage is applied to the resistor, a current can flow through the second grid, so that the resistance generated when the excessively high voltage is applied It is possible to prevent a change in the resistance value of the body, damage to the resistor body, disconnection, and the like.

Further, the terminal according to the present invention is a terminal provided on an electron gun having a resistor and a plurality of grids, wherein a first connection portion connected to the resistor and the first connection portion are provided.
A second connecting portion extending from the first connecting portion and connected to the first grid; and a second connecting portion protruding from between the first and second connecting portions and disposed near the first grid. 2
And a discharge end on the grid.

According to the terminal according to the present invention, the terminal provided on the electron gun having the resistor and the plurality of grids protrudes from between the first and second connection portions and is located near the first grid. The provision of the discharging end in the second grid provided allows current to flow through the second grid, so that when a high voltage is applied to the resistor by performing a withstand voltage process or the like. In addition, it is possible to prevent the resistance value of the resistor from fluctuating when an excessively high voltage is applied, to prevent the resistor from being damaged or disconnected, and to ensure stable operation of the electron gun.

In the present invention, if the resistor is configured to supply power to the first grid provided with the electron gun and to discharge to the second grid disposed near the first grid. Often, examples of the resistor include a resistor according to the present invention. At this time, an insulating substrate such as alumina ceramics can be suitably used as the insulating substrate constituting the resistor, and the resistor provided on the insulating substrate is made of, for example, lead borosilicate glass. A substance obtained by printing a paste on the insulating substrate and firing the paste can be suitably used. Also,
As the electrode provided in the resistor, for example, a substance obtained by printing and firing a paste made of a metal oxide such as ruthenium oxide and lead borosilicate glass can be suitably used. Furthermore, as an insulating layer covering the resistor and the like,
For example, a substance including a transition metal oxide such as iron, nickel, chromium, cobalt, zinc, cadmium, copper, and zinc and a lead borosilicate can be suitably used (Japanese Patent Application Laid-Open No. Sho 6 (1994)).
3-6730). In the present invention,
The resistor and the first and second grids are more first than the resistor.
It is only necessary to be configured so that power is supplied to the first grid and discharged to the second grid. To realize the above configuration, for example, a second connection that is electrically connected to the first grid A terminal may be used that has an end formed by shaping a tip into a shape suitable for electric discharge for discharging to the portion and the second grid, and configured to arrange the end close to the second grid. . As such a terminal, a terminal according to the present invention can be preferably cited. In the terminal, a first connection portion connected to a resistor is provided so that an electrical connection is made with the resistor. The shape can be set arbitrarily. For example, it can be processed into a shape to be connected by caulking a resistor. Also, the second connection portion and the end portion are such that the second connection portion is the first connection portion.
Are connected to the second grid and the ends are configured to discharge to the second grid, the mutual positional relationship does not interfere with each other, and the shapes of the second connecting portion and the end are appropriately adjusted. Can be set. That is, the second connection portion may be designed to be electrically connected to the first grid, and the end portion may be designed to have a shape suitable for discharge. Here, a preferred embodiment of the end portion when the end portion of the terminal is used for discharge will be described. When the end of the terminal is used for discharging, as an element for controlling the discharging,
The voltage applied to the terminal, the shape of the end, and the distance between the terminal and the current flowing object such as a grid can be listed. These factors are optimal in view of how much voltage will cause discharge. I just want to make it. However, in general, when a discharge is caused from the end of the terminal, if the shape of the end is shaped such that the diameter becomes smaller toward the tip of the end, that is, if it is formed into a protrusion, the discharge is smoothly caused. It becomes possible. For example, in the case where the end of the terminal is formed as a protrusion and discharge is caused at 60 kV, the maximum width of the terminal at the end provided with the protrusion is 0.6 to 1.4 mm, and the protrusion and the second grid through which current flows are formed. Distance 0.5-1.5
If the angle formed by the projections is set to 40-60 °, it is possible to reliably discharge at 60 kV. However, in order to prevent the function of the electron gun from being impaired and to prevent malfunction, etc., when discharging at 60 kV, the maximum width of the terminal at the end provided with the protrusion should be 0.6-0. 8 mm, the distance between the protrusion and the second grid through which the current flows is O.D. 8-1. Omm, 50-
It is preferable to set the angle in the range of 60 °.

Next, a second connection portion for making electrical connection with the first grid is connected to the resistor, and an end portion formed into a shape suitable for discharge for discharging to the second grid. When connecting a terminal configured to arrange the end portion close to the second grid, a position where the terminal is arranged will be considered. As described above, the resistor is provided with the resistor, and at least one electrode is formed on the resistor in order to supply power to the grid from the resistor via the resistor. That is, in addition to the electrodes provided on the first voltage side (high voltage side) and the second voltage side (low voltage side) which is lower than the first voltage, the resistor is supplied to the grid. At least one electrode is provided. By the way, the resistor is formed so that its resistance value becomes a predetermined value, but the resistance value adjusted to the predetermined value may change in a later process. That is, when an electron tube is manufactured using an electron gun equipped with a resistor, a metal wire, for example, a metal ring 19 shown in FIG. When a film is formed, a deposited film is formed in a region closer to the metal ring 19 in the resistor, and as a result, the rate of change of the resistance value in the region is increased. Then, in a region where the rate of change of the resistance value is large, the probability of disconnection or damage of the resistor when a high voltage is applied increases significantly. This is because excessive current is supplied to a region where the rate of change of the resistance value is large. The current is supplied not only from the high voltage side but also from the low voltage side due to arc discharge or the like. There is also. Therefore, by appropriately selecting the high voltage side or the low voltage side of the resistor, and connecting the terminal to the electrode arranged near the metal wire, it is configured such that an excessive current is not supplied to the region. Therefore, even when a high voltage is applied to the resistor, it is possible to prevent disconnection or damage of the resistor. Generally, there is a higher probability that an excessive current is supplied to a region where the rate of change of the resistance value is higher than the high voltage side of the resistor. That is, it is more frequently performed from the high voltage side. However, when arc discharge or the like frequently occurs from the low voltage side, it is possible to discharge an excessive current from the low voltage side from the above-described region. As described above, when the electrode is connected to the resistor, the direction in which the excess current is likely to be supplied to the region where the rate of change in the resistance value is large, that is, the high voltage side or the low voltage side is selected. Then, connect the terminal to the electrode arranged near the metal wire. Thus, the first grid is supplied with power through the electrode disposed near the metal wire, and the second grid is discharged through the electrode. If necessary, the terminal may be connected to a plurality of electrodes. With such a structure, even if a high voltage is applied to the resistor, the resistor may be disconnected or damaged. Etc. can be more reliably prevented.

In the present invention, the first and second grids include, for example, a control grid to which a negative voltage is applied from a cathode, a screen grid to attract electrons by a positive voltage, an acceleration of electrons, A focus electrode and an anode that converge electrons by an electrostatic lens function can be used. The first and second grids may be adjacent to each other or may be arranged via another grid. Preferably, the first and second grids are selected so that the potential difference between the first and second grids with respect to the second grid is reduced. In particular, in an electron tube such as a color cathode ray tube, the first and second grids are arranged between the cathode and the convergence electrode. The pressure in the vacuum vessel of the electron tube provided with the electron gun is usually reduced to about 10 ⁻⁵ atm.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. In each of the drawings, the same components are denoted by the same reference numerals, and detailed description will be omitted. The present invention is not limited to the present invention without departing from the gist thereof.

FIG. 1 is a diagram showing one embodiment of a resistor according to the present invention. FIG. 1A shows a state in which the resistor is seen through from the insulating layer, and FIG.
The state which cut | disconnected the resistor along the line is shown.

As shown in FIG. 1, the resistor according to the present embodiment has through holes 25a to 25d in an insulating substrate 20 made of aluminum oxide, and a metal oxide containing ruthenium oxide on the insulating substrate 20. The electrodes 21a to 21d made of a material and lead borosilicate glass are formed. Also, a resistor 23 formed in contact with the electrodes 21a-21d
Are formed so that the resistance value is adjusted so as to obtain a predetermined resistance value in the regions indicated by RA, RB, and RC, and a zigzag pattern is formed. Further, the resistor 23 is provided with a trimming portion 26 in the pattern for adjusting the resistance of the resistor 23 again when the resistance of the resistor 23 deviates from a predetermined value. 2
Even after the resistor 3 is formed by firing, the resistance can be adjusted even if the resistance of the resistor 23 deviates from a predetermined value. Further, while covering the resistor 23, the electrode 21a
-21d, the insulating layer 24 is formed, and the electrode 2
Terminals 22a, 22b and 22d are caulked and connected to 1a, 21b and 21d. On the other hand, to the electrode 21c, as shown in FIG. 2, a terminal 28 provided with a projection 27 at the end is also caulked and connected.

Next, a method of manufacturing the resistor shown in FIG. 1 will be described.

First, a paste made of a metal oxide containing ruthenium oxide and lead borosilicate glass was printed on the insulating substrate 20, dried, and fired to form the electrodes 21a to 21d. Next, a paste material containing lead borosilicate glass was applied to a total resistance value of 1.0 × 10 ⁹ Ω.
After that, the resistor 23 was formed by printing by a screen printing method, followed by drying and firing. Next, the trimming portion 26 was cut by a sand blast method or the like so as to obtain a predetermined division ratio. Next, the insulating substrate 2
An insulating layer 24 mainly composed of a transition metal oxide and lead borosilicate was formed by printing on the front and back surfaces of the insulating substrate 20 by a screen printing method so as to cover 0 and the resistor 23. Finally, the terminals 22a, 22b, 28 are inserted into the through holes 25a-25d.
And 22d are inserted and swaged, and the terminals 22a, 22d are inserted.
The resistors shown in FIG. 1 were obtained by connecting b, 28 and 22d to the electrodes 21a to 21d.

Next, the resistor was mounted on the neck of the color cathode ray tube together with the electron gun, and the color cathode ray tube was subjected to pressure resistance treatment to check the damage of the resistor. The arrangement relationship between the resistor and the electron gun is the same as that shown in FIG. 5, but as shown in FIGS. 3A and 3B, the protrusion 27 of the terminal 28 is the sixth grid. It is arranged close to G6 with a gap of 1 mm. At this time, the sixth
Since the grid G6 has the same potential as the fourth grid G4, the voltage applied during the withstand voltage process can be grounded from the region indicated by RC. FIG.
The maximum width A of the terminal 28 shown in (b) is 1.4 mm, and the angle R formed by the projection 27 is 60 °. Further, the voltage applied during the withstand voltage processing is 60 kV.
The pressure resistance treatment was performed using 15 color cathode ray tubes. Note that the conditions for the pressure resistance processing are exactly the same when the conventional resistor shown in FIG. 6 is used.

As a result of the withstand voltage treatment, no disconnection of the resistor 23 in the RB region of the resistor due to the discharge penetration was observed. 2.8 when the resistor of
%, In the present embodiment, the occurrence rate of the characteristic specification failure due to the damage of the resistor 23 is reduced to 0.1% or less. Further, when the resistor after the withstand voltage treatment was taken out from the neck and inspected, FIG.
In the present embodiment, the change ratio of the division ratio when the conventional resistor shown in FIG.
The change ratio of the dividing ratio of the resistor was within 0.2% in all cases.

Next, in performing the withstand voltage processing, these values are changed in order to optimize the maximum width A of the terminal 28, the angle R formed by the protrusion 27, and the gap between the terminal 28 and the sixth grid G6. Then, a pressure resistance treatment was applied to the color cathode ray tube. Note that the maximum width A of the terminal 28, the angle R formed by the protrusion 27, and the gap between the protrusion 27 and the sixth grid G6 are adjusted as shown in Table 1, and the structure and the pressure resistance of other color cathode-ray tubes are adjusted. Are completely the same as those in the above embodiment.

[0031]

[Table 1] As a result of the pressure resistance processing, as shown in Table 1, Under the conditions shown in 1 and 6, the rate of change (ΔRB) of the resistance value of the resistor 23 in the RB region during the withstand voltage process is set to 0.
1% and 0.2% were able to be suppressed, but current flows between the gap between the terminal 28 and the sixth grid G6 and between the terminals 28 during the actual operation of the color cathode ray tube, and a display defect or the like occurs during the actual operation. It was confirmed that. Also, N
o. Under the conditions shown in FIG. 5, since the gap between the protrusion 27 and the sixth grid G6 was too large, no discharge occurred from the protrusion 27 during the pressure resistance treatment, and the resistor 23 in the RB region was not used.
It was confirmed that the rate of change (ΔRB) of the resistance value of the sample became large. In addition, No. Under the conditions 2, 3, and 4, not only the rate of change (ΔRB) of the resistance value of the resistor 23 in the RB region during the withstand voltage processing could be suppressed to 0.1-0.2%, but also Good actual operation could be achieved.

Therefore, as is apparent from the processing judgment section in Table 1, the maximum width (A) of the terminal at the end portion having the protrusion is 0.6-1.4 mm, and the width of the terminal between the protrusion and the grid through which current flows is set. If the distance (B) is set to 0.5-1.5 mm and the angle (R) formed by the projections is set to 40-60 °, it can be confirmed that the method can be sufficiently applied to the pressure resistance treatment. In order to ensure the actual operation, the maximum width (A) of the terminal at the end provided with the protrusion should be 0.6-0. It was confirmed that the protrusion (8), the distance (B) between the protrusion and the grid through which the current flows, and the like (0.8-1.0 mm), and the angle (R) formed by the protrusion were in the range of 50-60 °. The maximum width (A) of the terminal at the end provided with the projection, the distance (B) between the projection and a grid or the like through which a current flows, and the angle (R) formed by the projection are changed depending on the conditions at the time of withstand voltage processing. be able to. Needless to say, the mounting position of the resistor on the electron gun can be appropriately set according to the specifications.

[0033]

As described in detail above, according to the electron gun of the present invention, the second grid discharged from the resistor is provided near the first grid supplied from the resistor. With the provision, the current can flow through the second grid, so that even when a high voltage is applied by performing withstand voltage processing or the like, it is possible to provide an electron gun that can guarantee stable operation. .

According to the electron gun of the present invention, the second grid that is discharged through the electrode is provided near the first grid that is supplied with power through the electrode provided near the metal wire. As a result, a current can flow through the second grid, so that it is possible to provide an electron gun that can guarantee a stable operation even when a high voltage is applied by performing a withstand voltage process or the like.

Further, according to the resistor of the present invention, power is supplied to the first grid from the connection area secured in the electrode,
In addition, by providing a discharging terminal on the second grid, a current can flow through the second grid when an excessively high voltage is applied to the resistor, so that when an excessively high voltage is applied, Fluctuations in the resistance of the resistor
It is possible to provide a resistor that can prevent the resistor from being damaged and disconnected.

According to the terminal of the present invention, the terminal provided on the electron gun having the resistor and the plurality of grids protrudes from between the first and second connection parts,
Is provided with an end for discharging to the second grid disposed near the grid, current can flow through the second grid. The terminal which can prevent the fluctuation of the resistance value of the resistor caused when an excessively high voltage is applied, the damage of the resistor, the disconnection, etc., and the stable operation of the electron gun. Can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a resistor according to the present invention.

FIG. 2 is a view showing a terminal provided with a protrusion 27 at an end.

FIG. 3 is a diagram showing an arrangement relationship between a terminal provided with a protrusion 27 at an end and a sixth grid G6.

FIG. 4 is a diagram showing a configuration of a color cathode-ray tube to which a method in which a high voltage is supplied to each electrode by dividing an anode voltage by a resistor is applied.

FIG. 5 is a diagram showing a configuration of an electron gun.

FIG. 6 is a diagram showing a configuration of a resistor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Panel 2 ... Funnel 3 ... Phosphor screen 4 ... Shadow mask 5 ... Neck 6B, 6G, 6R ... 3 Electron beam 7 ... Electron gun
8 Deflection yoke 9 Convergence electrode 10 Bead glass 11 Conductor 12 Resistors 13a, 13b
14, 15 Terminal 16 Ground electrode pin 17 Graphite conductive film 18 Conductive spring 19 Metal ring 20
... Insulating substrate 21a-21d ... Electrode 22a-22d ... Terminal 23 ... Resistor 24 ... Insulating layer 25a-25d
... Through-hole 26... Trimming part 27... Projection 28.

Claims (4)

[Claims] 1. A power supply comprising: a resistor; a first grid supplied with power from the resistor; and a second grid disposed near the first grid and discharged from the resistor. An electron gun. 2. A resistor provided with a plurality of electrodes, a metal wire arranged near the resistor, and a first power supplied from an electrode arranged near the metal wire.
And a second grid disposed near the first grid and discharged from the electrode. 3. A resistor provided on an electron gun having a plurality of grids, comprising: an insulating substrate; a resistor provided on the insulating substrate; an electrode connected to the resistor; And an insulating layer covering the electrode so as to secure a connection region for the electrode, and a terminal for supplying power to the first grid from the connection region and discharging to the second grid. Resistor. 4. A terminal provided on an electron gun having a resistor and a plurality of grids, a first connection portion connected to the resistor, a first connection portion extending from the first connection portion, A second connection portion connected to the first grid, and a second connection portion protruding from between the first and second connection portions;
A discharge end to a second grid disposed near the grid.