JP2000106102A - Electron gun for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electron gun for a cathode-ray tube, capable of suppressing occurrence of dielectric breakdown by suppressing creeping discharge along the surface of an insulation supporting body between at least two electrodes, such as body auxiliary electrodes. SOLUTION: A high-voltage side auxiliary electrode 35 and a low voltage side auxiliary electrode 36 facing each other are planted in insulation supporting bodies 37a, 37b in order to fix and hold them there, and a planted part of the low-voltage side auxiliary electrode 36 is provided in a place apart from the position equivalent to a position, where a planted part of the high voltage side auxiliary electrode 35 is provided. A planted part of the high-voltage side auxiliary electrode 35 is provided in a place apart from the position equivalent to the position, where the low-voltage side auxiliary electrode 36 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a cathode ray tube.

[0002]

2. Description of the Related Art FIG. 9 is an explanatory view showing the structure of a conventional electron gun for a cathode ray tube. In the figure, 1 is a neck tube, 2 is an electron beam, 3 is a heater, 4 is a cathode, 5 is a first electrode, 6
Is the second electrode, 7 is the third electrode, 8 is the fourth electrode, 9 is the fifth electrode
(1) electrode, 10 is a fifth (2) electrode, 11 is a low voltage side chest electrode, 12 is a low voltage side head electrode, 13 is a high voltage side head electrode, 14 is a high voltage side chest electrode, 15 is a high voltage side auxiliary electrode, 16 Denotes a low-voltage side auxiliary electrode, 17a and 17b denote insulating supports, and 18 denotes a lens central axis.

FIG. 10A is a front view of the high-voltage auxiliary electrode 15 or the low-voltage auxiliary electrode 16, and FIG.
10A is a bottom view, and FIG. 10C is a right side view of FIG. 10 (a), 10 (b), 10 (c)
In the above, 15a, 15b or 16a, 16b is a raised portion implanted in the insulating support members 17a, 17b, 15
c, 15d or 16c, 16d are tab portions connected to the voltage application lead, and 15e or 16e is the electron beam 2
Is an electron beam passage port through which.

FIG. 11A, FIG. 11B, FIG.
1 (c) is a rising portion 15a of the high-voltage side auxiliary electrode 15,
15b and the rising portion 16a of the low-voltage side auxiliary electrode 16,
FIG. 11B is a layout view showing a state in which 16b is implanted and fixedly held in insulating supports 17a and 17b. FIG. 11A is a front view, FIG. 11B is a bottom view of FIG. 11
FIG. 12C is a right side view of FIG. Each electrode has a notch portion (not shown), and is implanted and fixedly held on the insulating supports 17a and 17b. further,
Each electrode has a tab portion (not shown), and is conductively connected to the rising portion.

Next, the operation will be described. In the cathode ray tube electron gun having the above-described structure, the cathode 4 generally has a potential of about 0 to 200 V, the second electrode 6 and the fourth electrode 6 based on the potential of the first electrode 5.
The electrode 8 has a voltage of about 100 to 1500 V, and the high voltage side head electrode 13 and the high voltage side chest electrode 14 have 20,000 to 3 volts.
About 5000 V, the third electrode 7, the fifth (1) electrode 9, the fifth
(2) A potential of about 20% to 35% of the potential applied to the high-voltage head electrode 13 or the high-voltage chest electrode 14 is applied to the electrode 10, the low-voltage chest electrode 11, and the low-voltage head electrode 12. The voltage applied to each of the auxiliary electrodes 15 and 16 is given a potential of low voltage, high voltage, low voltage, and high voltage in order from the low voltage side head electrode 12 to the high voltage side auxiliary electrode 15, the low voltage side auxiliary electrode 16, and the high voltage side head electrode 13. I have.

The third electrode 7, the fifth (1) electrode 9, the fifth
(2) The electrodes 10, the low voltage side chest electrode 11, the low voltage side auxiliary electrode 16, and the low voltage side head electrode 12 are applied with substantially the same voltage, respectively. The fifth (2) electrode 10, the low voltage side chest electrode 11, the low voltage side The head electrode 12 is kept at the same potential. Further, the high voltage side head electrode 13 and the high voltage side auxiliary electrode 1
5, The high voltage side chest electrode 14 is also kept at the same potential.

For example, as shown in FIG. 11, between the rising portion 15a of the high voltage side auxiliary electrode 15 and the rising portion 16a of the low voltage side auxiliary electrode 16, or between the rising portion 15b and the rising portion 16b. Insulating supports 17a, 17b
Is referred to as a creepage distance D1. Since the creepage distance D1 exists over the entire opposing surface of the raised portion, the existence range of the creepage distance D1 does not exist at one point but linearly exists at the interface between the raised portion and the insulating support.

[0008]

In the above-mentioned conventional electron gun for a cathode ray tube, electrodes, for example, both auxiliary electrodes 15 and 16 are used.
, The creepage distance D1 is increased by the rising portions 15a, 15b,
Since there exists a linear shape at the interface between the insulating support members 16a and 16b and the insulating support members 17a and 17b, the potential difference between the auxiliary electrodes 15 and 16 is large.
There is a problem that creeping discharge occurs along the surfaces of 7a and 17b and dielectric breakdown easily occurs. Also, the creepage distance D1
Exist linearly at the interface between the recessed portions 15a, 15b, 16a, 16b and the insulating supports 17a, 17b. Therefore, when manufacturing an electron gun for a cathode ray tube, in order to improve withstand voltage such as seasoning, etc. When a high voltage higher than the voltage during normal use is applied between the auxiliary electrodes 15, 16 or when foreign matter adheres to the auxiliary electrodes 15, 16 by some accident, or when the cathode ray tube is driven, the auxiliary electrodes 15, 16 are used.
In the meantime, there is a problem that surface discharge may occur along the surfaces of the insulating supports 17a and 17b and dielectric breakdown may occur.

In order to avoid the above problem, when the distance between the auxiliary electrodes 15 and 16 is increased to increase the creepage distance D1,
The effect of the electric field on the electron beam passing inside changes, and adversely affects the spot diameter on the target, which is the original purpose of the auxiliary electrode. Even when the thickness of each electrode in the z direction is increased and the interval between the raised portions is increased, the spot diameter on the target is similarly adversely affected. further,
If the distance between the opposing portions of the electrodes is increased, a change in the potential of the inner wall of the neck tube has a large effect on the center trajectory of the electron beam, causing a problem of causing a convergence shift. Therefore, in order to avoid the above problem, for example, the space between the two auxiliary electrodes 15 and 16 is increased,
Means such as increasing the thickness in the z-axis direction of No. 6 could not be adopted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a first object is to provide a creeping surface along a surface of an insulating support between at least two opposing electrodes, for example, between both auxiliary electrodes. An object of the present invention is to provide an electron gun for a cathode ray tube which can suppress discharge and suppress occurrence of dielectric breakdown.

A second object is to improve the withstand voltage during seasoning, for example, during the manufacture of an electron gun for a cathode ray tube, by increasing the voltage between at least two opposing electrodes, for example, between both auxiliary electrodes, during normal use. When applying high high voltage,
Alternatively, when foreign matter adheres to both auxiliary electrodes by accident by driving the cathode ray tube, an electron gun for a cathode ray tube capable of suppressing creeping discharge along the surface of the insulating support and suppressing occurrence of dielectric breakdown is obtained. Things.

[0012]

According to an electron gun for a cathode ray tube according to the present invention, one of the electron guns for a cathode ray tube has an electron beam passage opening, and at least two opposing electrodes are fixedly held on an insulating support. In addition to the provision of the raised portion of the electrode, the raised portion of the other electrode is provided at a position distant from the position corresponding to the position where the raised portion is provided.

The one electrode virtually takes a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on the surface of the electrode having the electron beam passage opening, and the first and third quadrants of the quadrant are taken. A raised portion is provided in each of the quadrants, and a raised portion is provided in each of the second and fourth quadrants of the other quadrant, and the electrodes are fixed to and held on the insulating support so as to face each other. Things.

On one electrode, a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis are virtually taken on the surface of the electrode having the electron beam passage opening, and the first and fourth quadrants of the quadrant are taken. A raised portion is provided in each of the quadrants, and a raised portion is provided in each of the other electrodes in the second and third quadrants of the quadrant, and the electrodes are fixed to and held on the insulating support so as to face each other. Things.

Further, one of the electrodes virtually takes a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on a surface of the electrode having an electron beam passage opening. A raised portion is provided in each of the quadrants, and a raised portion is provided in the other electrode in each of the third and fourth quadrants of the quadrant, and the electrodes are fixed to and held by the insulating support so as to face each other. Things.

[0016] Further, each of the raised portions provided on both electrodes is implanted in the insulating support, and a groove is provided between each of the raised portions of the insulating support. The creepage distance of the surface between them is increased.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an explanatory view showing the structure of a cathode ray tube electron gun according to Embodiment 1 of the present invention. In FIG. 1, 21 is a neck tube, 22 is an electron beam, 23 is a heater, 24 is a cathode, 25 is a first electrode,
26 is a second electrode, 27 is a third electrode, 28 is a fourth electrode, 2
9 is a fifth (1) electrode, 30 is a fifth (2) electrode, 31 is a low voltage side chest electrode, 32 is a low voltage side head electrode, 33 is a high voltage side head electrode, 34 is a high voltage side chest electrode, and 35 is a high voltage side Auxiliary electrode, 36 is a low voltage side auxiliary electrode, 37a, 37b
Denotes an insulating support made of bead glass, and 38 denotes a lens central axis.

FIG. 2A is a front view of the high voltage side auxiliary electrode 35, FIG. 2B is a bottom view of FIG. 2A, and FIG. 2C is a right side view of FIG. 2A. is there. 2 (a), 2 (b),
In FIG. 2 (c), the x-axis, y-axis and I, II, III
, IV are a rectangular coordinate axis virtually taken on a surface having an electron beam passage opening 35a through which the electron beam 22 passes, and four quadrants divided by the rectangular coordinate axis. I, I
I, III, and IV represent a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant, respectively. The z-axis is an axis perpendicular to the intersection of the rectangular coordinate axes, and as shown in FIG. 1, indicates a horizontal center axis of the electron gun for a cathode ray tube. Reference numeral 35b denotes a rising portion provided in the second quadrant, and 35c denotes a rising portion provided in the fourth quadrant. Tab portions 35d and 35e are connected to the voltage application leads. The tab portion 35d is provided in the second quadrant, and the tab portion 35e is provided in the fourth quadrant.

FIG. 3A is a front view showing a state in which the high-voltage side auxiliary electrode 35 and the low-voltage side auxiliary electrode 36 are implanted and fixedly held on insulating supports 37a and 37b, and FIG. 3A is a bottom view of FIG. 3A, and FIG. 3C is a right side view of FIG. The low voltage side auxiliary electrode 36 is
In the electron gun for a cathode ray tube, the electron gun is turned upside down with the x-axis or the y-axis as a base axis, is opposed to the high-voltage auxiliary electrode 35, is implanted in the insulating supports 37a and 37b, and is fixed and held. Accordingly, 36b is a raised portion provided in the first quadrant, 36c is a raised portion provided in the third quadrant, 36d is a tab portion provided in the first quadrant, and 36e is provided in the third quadrant. Indicates a tab portion.

As described above, the ridge 36b of the low-voltage auxiliary electrode 36 does not exist at a position corresponding to the position where the ridge 35b of the high-voltage auxiliary electrode 35 is provided. Further, the ridge 36c of the low-voltage auxiliary electrode 36 does not exist at a position corresponding to the position where the ridge 35c of the high-voltage auxiliary electrode 35 is provided. That is, the rising portion 36b of the low-voltage auxiliary electrode 36 is disposed at a position away from the position corresponding to the position where the rising portion 35b of the high-voltage auxiliary electrode 35 is provided, or the rising of the high-voltage auxiliary electrode 35. The rising portion 36c of the low-voltage side auxiliary electrode 36 is disposed at a position apart from a position corresponding to the position where the portion 35c is provided.

The electrodes 25, 26, 27, 28, 2
9, 30 and 31 have respective raised portions and tab portions similar to the arrangement shown in FIG. 2, and the raised portions are implanted in insulating supports 37a and 37b and fixed and held. Are conductively connected to the recess.

Next, the operation will be described. In the electron gun for a cathode ray tube having the above-described structure, the cathode 24 generally has a potential of about 0 to 200 V, the second electrode 26 and the fourth electrode 28 have a potential of about 100 to 1500 V, and a high voltage side head electrode, based on the potential of the first electrode 25. 33 and the high voltage side chest electrode 34
The third electrode 27, the fifth (1) electrode 29, the fifth (2) electrode 30, and the low-voltage chest electrode 3 of about 00 to 35000 V
1, 20% of the potential applied to the high voltage side head electrode 33 or the high voltage side chest electrode 34 is applied to the low voltage side head electrode 32.
A potential of about 35% is applied. Each auxiliary electrode 35, 3
6, the voltage from the low-voltage head electrode 32 to the high-voltage auxiliary electrode 35, the low-voltage auxiliary electrode 36, the high-voltage head electrode 3
In the order of 3, potentials of low voltage, high voltage, low voltage and high voltage are applied.

The third electrode 27, the fifth (1) electrode 29, the fifth
(2) The electrodes 30, the low-voltage chest electrode 31, the low-voltage auxiliary electrode 36, and the low-voltage head electrode 32 are applied with substantially the same voltage, respectively, and the fifth (2) electrode 30, the low-voltage chest electrode 31, and the low-voltage side. The head electrode 32 is kept at the same potential. Further, the high voltage side head electrode 33 and the high voltage side auxiliary electrode 3
5. The high-voltage chest electrode 34 is also kept at the same potential.

According to the first embodiment, as shown in FIG. 3, between the at least two opposing electrodes, for example, the recess 35b of the high-voltage auxiliary electrode 35 and the recess 36b of the low-voltage auxiliary electrode 36 are formed. Between the raised portions 35c and the raised portions 36c, or between the raised portions 36c.
The creepage distance D11, which is the shortest path on the surface of 7b, does not exist linearly at the interface between the rising portion and the insulating support as in the related art, and the corner of the rising portion 35b and the corner of the rising portion 36b are different from each other. Or the corner of the rising portion 35c and the rising portion 3
There is only one point with the corner of 6c. As a result, the creepage distance D11 can be longer than the conventional creepage distance D1, and the electric field strength between the two auxiliary electrodes is reduced, so that creeping discharge along the surface of the insulating support can be suppressed, The occurrence of dielectric breakdown can be suppressed.

Also, the creepage distance D11 does not exist linearly at the interface between the raised portion and the insulating support as in the conventional case, and the creepage distance D11 can be made longer than the conventional creepage distance D1. Since the electric field strength between the two auxiliary electrodes is reduced, a high voltage higher than the voltage at the time of normal use is applied between the two auxiliary electrodes when manufacturing the electron gun for the cathode ray tube, for example, in order to improve the withstand voltage such as seasoning. Even when a foreign substance adheres between the auxiliary electrodes by accident or when the cathode ray tube is driven, the creeping discharge along the surface of the insulating support can be suppressed, and the occurrence of dielectric breakdown can be suppressed.

It is to be noted that the rising portion 35 of the high voltage side auxiliary electrode 35
b, 35c, the second quadrant, the fourth quadrant, or the low voltage side auxiliary electrode rising portions 36b, 36c, the first quadrant,
In the third quadrant, the above arrangement and the target arrangement, that is, the ridge 3
The arrangement of 5b and 35c is provided in the first and third quadrants, or the arrangement of the rising portions 36b and 36c is in the second and fourth quadrants.
It may be provided in a quadrant and has the same effect as above.

In addition to the raised portions 35b, 35c, 36b, 36c of the auxiliary electrodes 35, 36, the raised portions 35b, 35b of the auxiliary electrodes 35, 36 are also provided. 35c, 36b, 36
Since the arrangement is the same as that of c, the same effects as above can be obtained.

Embodiment 2 An explanatory view showing the structure of a cathode ray tube electron gun according to Embodiment 2 of the present invention is the same as that of FIG. 1, and the description of the same reference numerals is omitted. However, Embodiment 2
The high voltage side auxiliary electrode is 45 and the low voltage side auxiliary electrode is 4
6. The insulating supports made of bead glass are 47a and 47b
Is attached.

FIG. 4A is a front view of the high-voltage side auxiliary electrode 45, FIG. 4B is a bottom view of FIG. 4A, and FIG. 4C is a right side view of FIG. is there. 4 (a), 4 (b),
In FIG. 4 (c), the x-axis, y-axis and I, II, III
, IV are a rectangular coordinate axis virtually taken on a surface having an electron beam passage opening 45a through which the electron beam 22 passes, and four quadrants divided by the rectangular coordinate axis. I, I
I, III, and IV represent a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant, respectively. The z-axis is an axis perpendicular to the intersection of the rectangular coordinate axes, and as shown in FIG. 1, indicates a horizontal center axis of the electron gun for a cathode ray tube. 45b is a rising portion provided in the second quadrant, and 45c is a rising portion provided in the third quadrant. Tab portions 45d and 45e are connected to the voltage application leads. The tab portion 45d is provided in the second quadrant, and the tab portion 45e is provided in the third quadrant.

FIG. 5A is a front view showing a state in which the high-voltage auxiliary electrode 45 and the low-voltage auxiliary electrode 46 are implanted and fixedly held on insulating supports 47a and 47b, and FIG. 5A is a bottom view of FIG. 5A, and FIG. 5C is a right side view of FIG. 5A. The low voltage side auxiliary electrode 46 is connected to the high voltage side auxiliary electrode 45.
In the electron gun for a cathode ray tube, the electron gun is turned upside down around the y-axis, opposed to the high-voltage side auxiliary electrode 45, and implanted and fixedly held in insulating supports 47a and 47b.
Accordingly, 46b is a rising portion provided in the first quadrant, 4b.
Reference numeral 6c denotes a rising portion provided in the fourth quadrant, and 46d
Indicates a tab provided in the first quadrant, and 46e indicates a tab provided in the fourth quadrant.

As described above, the depression 46b of the low-voltage auxiliary electrode 46 does not exist at the position corresponding to the position where the depression 45b of the high-voltage auxiliary electrode 45 is provided. In addition, the depression 46c of the low-voltage auxiliary electrode 46 does not exist at a position corresponding to the position where the depression 45c of the high-voltage auxiliary electrode 45 is provided. In other words, the rising portion 46b of the low-voltage auxiliary electrode 46 is disposed at a position away from the position corresponding to the position where the rising portion 45b of the high-voltage auxiliary electrode 45 is provided, or the rising of the high-voltage auxiliary electrode 45. The rising portion 46c of the low-voltage auxiliary electrode 46 is arranged at a position apart from a position corresponding to the position where the portion 45c is provided.

According to the second embodiment, as shown in FIG. 5, between the at least two opposing electrodes, for example, the recess 45b of the high-voltage auxiliary electrode 45 and the recess 46b of the low-voltage auxiliary electrode 46 are formed. Between the raised portions 45c and the raised portions 46c or between the raised portions 46c.
The creepage distance D21, which is the shortest path on the surface of 7b, does not exist linearly at the interface between the rising portion and the insulating support as in the related art, and the corner of the rising portion 45b and the corner of the rising portion 46b Or the corner of the rising portion 45c and the rising portion 4
There is only one point with the corner of 6c. As a result, the creepage distance D21 can be made longer than the conventional creepage distance D1, and the electric field strength between the two auxiliary electrodes is reduced, so that creeping discharge along the surface of the insulating support can be suppressed, The occurrence of dielectric breakdown can be suppressed.

Also, the creepage distance D21 does not exist linearly at the interface between the raised portion and the insulating support as in the conventional case, and the creepage distance D21 can be made longer than the conventional creepage distance D1. Since the electric field strength between the two auxiliary electrodes is reduced, a high voltage higher than the voltage at the time of normal use is applied between the two auxiliary electrodes when manufacturing the electron gun for the cathode ray tube, for example, in order to improve the withstand voltage such as seasoning. Even when a foreign substance adheres between the auxiliary electrodes by accident or when the cathode ray tube is driven, the creeping discharge along the surface of the insulating support can be suppressed, and the occurrence of dielectric breakdown can be suppressed.

The arrangement of the raised portions 45b and 45c of the high-voltage auxiliary electrode 45 between at least two opposing electrodes, for example, the second and third quadrants, or the arrangement of the raised portions 46b and 46c of the low-voltage auxiliary electrode. In the first and fourth quadrants, the above arrangement and the target arrangement, that is, the arrangement of the raised portions 45b and 45c are provided in the first and fourth quadrants, or the arrangement of the raised portions 46b and 46c is set in the second and fourth quadrants. It may be provided in three quadrants, and the same effect as described above is achieved.

Further, the rising portions 45b and 45c of the high-voltage auxiliary electrode 45 or the rising portions 46b and 46c of the low-voltage auxiliary electrode 46 are respectively symmetrically arranged with respect to the x-axis. For this reason, each of the auxiliary electrodes 45 and 46 is fixed with a jig (not shown), and the insulating support members 47a and 47b made of bead glass melted by burning with a gas burner or the like are used.
In the process of inserting and implanting the rising portions 45b and 45c or the rising portions 46b and 46c from both sides in the y-axis direction, and fixing and holding the auxiliary electrodes 45 and 46 on the insulating supports 47a and 47b, Since the insertion pressure applied from the y direction of the rising portions 45b and 45c or the rising portions 46b and 46c is applied symmetrically to the x axis, it is possible to prevent the auxiliary electrodes 45 and 46 from rotating around the z axis. As a result, the accuracy of the position of the intermediate electrode, for example, the auxiliary electrodes 45 and 46 is improved, and the increase in spot diameter on a screen (not shown) caused by the deterioration of the accuracy can be reduced.

Embodiment 3 An explanatory view showing the structure of a cathode ray tube electron gun according to Embodiment 3 of the present invention is the same as that of FIG. 1, and the description of the same reference numerals is omitted. However, Embodiment 3
The high voltage side auxiliary electrode is 55 and the low voltage side auxiliary electrode is 5
6. The insulating supports made of bead glass are 57a and 57b.
Is attached.

FIG. 6A is a front view of the high voltage side auxiliary electrode 55, FIG. 6B is a bottom view of FIG. 6A, and FIG. 6C is a right side view of FIG. is there. 6 (a), 6 (b),
In FIG. 6 (c), the x-axis, y-axis and I, II, III
, IV are rectangular coordinate axes virtually taken on a surface having an electron beam passage opening 55a through which the electron beam 22 passes, and four quadrants divided by the rectangular coordinate axes. I, I
I, III, and IV represent a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant, respectively. The z-axis is an axis perpendicular to the intersection of the rectangular coordinate axes, and as shown in FIG. 1, indicates a horizontal center axis of the electron gun for a cathode ray tube. 55b is a rising portion provided in the third quadrant, and 55c is a rising portion provided in the fourth quadrant. Tab portions 55d and 55e are connected to the voltage application leads. The tab portion 55d is provided in the third quadrant, and the tab portion 55e is provided in the fourth quadrant.

FIG. 7A shows a state in which the high-voltage auxiliary electrode 55 is implanted and fixedly held on the insulating support 57b, and the low-voltage auxiliary electrode 56 is implanted and fixedly held on the insulating support 57a. 7 (b) is a bottom view of FIG. 7 (a),
FIG. 7C is a right side view of FIG. The low-voltage auxiliary electrode 56 has the same shape as the high-voltage auxiliary electrode 55. In the electron gun for a cathode ray tube, the low-voltage auxiliary electrode 56 is planted on an insulating support 57a facing the high-voltage auxiliary electrode 55 upside down with the x-axis as a base axis. Is fixedly held. Accordingly, 56b is a rising portion provided in the second quadrant, 56c is a rising portion provided in the first quadrant, 56d is a tab portion provided in the second quadrant, and 56e is provided in the first quadrant. Indicates a tab portion.

As described above, the depression 56b of the low-voltage auxiliary electrode 56 does not exist at a position corresponding to the position where the depression 55b of the high-voltage auxiliary electrode 55 is provided. Further, the ridge 56c of the low-voltage auxiliary electrode 56 does not exist at a position corresponding to the position where the ridge 55c of the high-voltage auxiliary electrode 55 is provided. That is, the rising portion 56b of the low-voltage auxiliary electrode 56 is disposed at a position apart from the position corresponding to the position where the rising portion 55b of the high-voltage auxiliary electrode 55 is provided, or the rising of the high-voltage auxiliary electrode 55 The raised portion 56c of the low-voltage side auxiliary electrode 56 is disposed at a position apart from a position corresponding to the position where the portion 55c is provided.

According to the third embodiment, as shown in FIG. 7, between the at least two opposing electrodes, for example, the ridges 55b and 55c of the high-voltage auxiliary electrode 55 and the ridge 56b of the low-voltage auxiliary electrode 56. , 56c are fixedly held on different insulating supports 57a, 57b, respectively, so that the distance between the rising portions of the electrodes having different potentials can be greatly increased as compared with the first and second embodiments. Since the electric field strength between the two auxiliary electrodes is reduced, it is possible to suppress creeping discharge along the surface of the insulating support, thereby suppressing the occurrence of dielectric breakdown.

Further, the distance between the rising portions of the electrodes having different potentials can be greatly increased as compared with the first and second embodiments, and the electric field strength between the two auxiliary electrodes can be reduced. When manufacturing a cathode ray tube electron gun, for example, when applying a high voltage higher than the voltage during normal use between the two auxiliary electrodes to improve the withstand voltage such as seasoning, or when driving the cathode ray tube, the two auxiliary electrodes are accidentally generated. Even when foreign matter adheres in between, creeping discharge along the surface of the insulating support can be suppressed, and occurrence of dielectric breakdown can be suppressed.

Embodiment 4 An explanatory view showing the structure of a cathode ray tube electron gun according to Embodiment 4 of the present invention is the same as that of FIG. However, Embodiment 4
The insulating support made of bead glass in the above is 67a, 6
Reference numeral 7b denotes a case where a high voltage side auxiliary electrode 45 and a low voltage side auxiliary electrode 46 of the second embodiment are provided as electrodes.

FIG. 8A is a front view showing a state in which the auxiliary electrodes 45 and 46 are implanted and fixedly held on the insulating supports 67a and 67b, and FIG. FIG. 8C is a bottom view and FIG. 8C is a right side view of FIG. FIG. 8 (a),
8 (b) and 8 (c), the x-axis and the y-axis are orthogonal coordinate axes taken on a surface having an electron beam passage opening 45a through which the electron beam 22 passes. The z-axis is an axis perpendicular to the intersection of the rectangular coordinate axes, and as shown in FIG. 1, indicates a horizontal center axis of the electron gun for a cathode ray tube.

Numeral 67c is a groove provided between the rising portions 45b, 46b of the insulating support 67a in which the rising portions 45b, 46b of the auxiliary electrodes 45, 46 are implanted. The creepage distance D31 including the surface between the grooves 46b and the groove 67c can be secured. Similarly, 67d is a groove provided between the rising portions 45c, 46c of the insulating support 67b in which the rising portions 45c, 46c of the auxiliary electrodes 45, 46 are implanted. A creepage distance D31 including the surface therebetween and the groove 67d can be secured. The groove 6
The lengths of 7c and 67d in the z-axis direction are indicated by arrows V in FIG.
As shown in FIG. 8D, which is a cross-sectional view taken along line III (d) -VIII (d), at least
The creepage distance D32 of the surface between c and 46c is equal to the creepage distance D including the surface between the two raised portions 45b and 46b and the groove 67c.
What is necessary is just to make it 31 or more.

According to the fourth embodiment, as shown in FIG. 8, the creepage distance between at least two opposed electrodes, for example, between the raised portions 45c and 46c of the auxiliary electrodes 45 and 46, is reduced. Standing part 45c and standing part 46c
And the creepage distance D31 including the surfaces of the insulating support bodies 67a and 67b and the grooves 67c and 67d between the first and second embodiments. As a result, it is possible to greatly increase the electric field strength between the two auxiliary electrodes.
It is possible to suppress creeping discharge from traveling along the surface of the insulating support, and suppress occurrence of dielectric breakdown.

Further, the auxiliary electrodes 45, 46 are fixed with jigs (not shown), and the insulating supports 47a, 47b made of bead glass melted by burning with a gas burner or the like are inserted into the raised portions 45b and 45c or the raised portions. Parts 46b and 4
6c is inserted and implanted from both sides in the y-axis direction, and the auxiliary electrodes 45, 46 are fixedly held on the insulating supports 67a, 67b, that is, the raised portions 45b, 45c, 46b, 46 are formed.
When c is pushed into the bead glass by pushing away the bead glass serving as the insulating supports 67a and 67b, the bead glass in the vicinity of the rising portion is pushed toward the grooves 67c and 67d.

Therefore, as a reaction, the recess 45 is formed.
b, 45c, 46b, 46c exerts a large force, but the presence of the grooves 67c, 67d causes the grooves 67c, 67c.
Pressing d reduces the reaction. As a result, it is possible to suppress an increase in spot diameter on the screen due to an assembly error caused by the deformation of the auxiliary electrodes 45 and 46 due to the force applied from the raised portions 45b, 45c, 46b and 46c.

[0048]

Since the present invention is configured as described above, it has the following effects.

In a cathode ray tube electron gun having an electron beam passage opening and at least two opposing electrodes fixedly held on an insulating support, one of the electrodes is provided with a recess and the recess is provided. By providing the raised portion of the other electrode at a position distant from the position corresponding to the depressed position, the creepage distance on the surface of the insulating support between the one raised portion and the other raised portion, It does not exist linearly at the interface between the recess and the insulating support as in the past,
There is only one point between the corner of one ridge and the corner of the other ridge. As a result, the creepage distance can be made longer than the conventional creepage distance, and the electric field strength between both electrodes is reduced, so that when a high voltage higher than the voltage in normal use is applied between both electrodes, or Even if foreign matter adheres between both electrodes by some accident when driving the cathode ray tube,
It is possible to suppress creeping discharge from traveling along the surface of the insulating support, and suppress occurrence of dielectric breakdown.

One of the electrodes virtually takes a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on a surface of the electrode having an electron beam passage opening, and the first and third quadrants of the quadrant are taken. A raised portion is provided in each of the quadrants, and a raised portion is provided in each of the second and fourth quadrants of the quadrant on the other electrode, and the electrodes are fixed to and held by the insulating support so as to face each other. By doing so, it is possible to arrange the rising portion of the other electrode at a position distant from the position corresponding to the position where the rising portion of one electrode is provided. The creepage distance on the surface of the insulating support between the other raised portion can be increased.

On one electrode, a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis are virtually taken on the surface of the electrode having the electron beam passage opening, and the first and fourth quadrants of the quadrant are taken. A raised portion is provided in each of the quadrants, and a raised portion is provided in each of the second and third quadrants of the other electrode on the other electrode, and the electrodes are fixed to and held on the insulating support so as to face each other. By doing so, it is possible to arrange the rising portion of the other electrode at a position distant from the position corresponding to the position where the rising portion of one electrode is provided. The creepage distance on the surface of the insulating support between the other raised portion can be increased. Further, by providing a raised portion in the first and fourth quadrants or the second and third quadrants, x
Since the electrodes are arranged symmetrically with respect to the axis, in the process of fixing and holding the electrodes on the insulating support, the insertion pressure applied from the y direction of each ridge is applied symmetrically to the x axis. Rotation can be prevented. As a result, the accuracy of the position of the electrode is increased, so that an increase in spot diameter on a screen (not shown) caused by the deterioration of the accuracy can be reduced.

One of the electrodes virtually takes a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on the surface of the electrode having the electron beam passage opening, and the first and second quadrants of the quadrant are taken. A raised portion is provided in each of the quadrants, and a raised portion is provided in the other electrode in each of the third and fourth quadrants of the quadrant, and the electrodes are fixed to and held by the insulating support so as to face each other. Thereby, it is possible to arrange the ridge of the other electrode at a position distant from the position corresponding to the ridge of one electrode, and the ridge of each electrode is mutually Since it is fixed and held on different insulating supports, it is possible to greatly increase the distance between the rising portions of the electrodes having different potentials.

Further, each raised portion provided on both electrodes is implanted in the insulating support, and a groove is provided between each raised portion of the insulating support, and the groove is formed by the groove. By increasing the creepage distance of the surface between them, it becomes possible to greatly increase the creepage distance of the surface between the rising portions of the electrodes having different potentials, and the electric field strength between both electrodes is reduced, so that the insulation It is possible to suppress creeping discharge along the surface of the support, and to suppress occurrence of dielectric breakdown. Further, in the step of fixing and holding both electrodes on the insulating support, that is, when the raised portion pushes the insulating support and is inserted into the insulating support, the electrode is pushed toward the groove side of the insulating support near the raised portion. Therefore, a large force is applied to the rising portion as a reaction, but the presence of the groove pushes the groove, and the reaction decreases. As a result, it is possible to suppress an increase in the spot diameter on the screen due to an assembly error caused by the deformation of the two electrodes due to the force applied from the raised portion.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a structure of a cathode ray tube electron gun according to Embodiment 1 of the present invention.

2 (a) is a front view of a high-voltage side auxiliary electrode of a cathode ray tube electron gun according to Embodiment 1 of the present invention, and FIG. 2 (b) is a bottom view of FIG. 2 (a); FIG. 2C is a right side view of FIG.

FIG. 3A is a front view showing a state in which a high-voltage auxiliary electrode and a low-voltage auxiliary electrode of the electron gun for a cathode ray tube according to the first embodiment of the present invention are implanted and fixedly held in an insulating support; FIG. 3B is a bottom view of FIG.
FIG. 3C is a right side view of FIG.

4A is a front view of a high-voltage auxiliary electrode of a cathode ray tube electron gun according to Embodiment 2 of the present invention, and FIG. 4B is a bottom view of FIG. FIG. 4C is a right side view of FIG.

FIG. 5 (a) is a front view showing a state in which a high-voltage auxiliary electrode and a low-voltage auxiliary electrode of a cathode ray tube electron gun according to a second embodiment of the present invention are implanted in an insulating support and fixed and held; FIG. 5B is a bottom view of FIG.
FIG. 5C is a right side view of FIG.

6 (a) is a front view of a high-voltage side auxiliary electrode of a cathode ray tube electron gun according to Embodiment 3 of the present invention, and FIG. 6 (b) is a bottom view of FIG. 6 (a); FIG. 7C is a right side view of FIG.

FIG. 7 (a) shows a third embodiment of the invention in which a high-voltage auxiliary electrode of a cathode ray tube electron gun is implanted and fixedly held in one insulating support, and a low-voltage auxiliary electrode is connected to the other insulating support. FIG. 7B is a front view showing a state where it is planted and fixed and held on the support, FIG. 7B is a bottom view of FIG. 7A, and FIG. 7C is a right side view of FIG. is there.

FIG. 8 (a) is a front view showing a state in which a high-voltage auxiliary electrode and a low-voltage auxiliary electrode of a cathode ray tube electron gun according to Embodiment 4 of the present invention are implanted in an insulating support and fixed and held. FIG. 8B is a bottom view of FIG.
FIG. 8C is a right side view of FIG. 8B, and FIG.
Is a sectional view taken along line VIII (d) -VIII (d) in FIG. 8 (a).

FIG. 9 is an explanatory view of a conventional electron gun for a cathode ray tube.

10A is a front view of a high-voltage auxiliary electrode or a low-voltage auxiliary electrode of a conventional electron gun for a cathode ray tube, FIG. 10B is a bottom view of FIG. 10A, and FIG. 10) is a right side view of FIG.

FIG. 11A is a front view showing a state in which a high-voltage side auxiliary electrode and a low-voltage side auxiliary electrode of a conventional electron gun for a cathode ray tube are implanted and fixedly held in an insulating support, and FIG. 11) is a bottom view of FIG. 11A, and FIG. 11C is a right side view of FIG. 11B.

[Explanation of symbols]

35, 45, 55 High voltage side auxiliary electrode 36, 46, 56 Low voltage side auxiliary electrode 37a, 37b Insulating support 35a, 45a, 55a Electron beam passage ports 35b, 35c, 36b, 36c, 45b, 45c, 4
6b, 46c, 55b, 55c, 56b, 56c Ridge 67c, 67d Groove D31 Creepage distance x-axis, y-axis Cartesian coordinate axis I First quadrant II Second quadrant III Third quadrant IV Fourth quadrant

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[Procedure amendment]

[Submission date] September 29, 1998 (1998.9.2)
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a structure of a cathode ray tube electron gun according to Embodiment 1 of the present invention.

FIG. 2A is a front view of a high-voltage side auxiliary electrode of the electron gun for a cathode ray tube according to the first embodiment of the present invention, and FIG.
Is a bottom view, and (c) is a right side view.

FIG. 3A is a front view showing a state in which a high-voltage auxiliary electrode and a low-voltage auxiliary electrode of the electron gun for a cathode ray tube according to the first embodiment of the present invention are implanted in an insulating support and fixed and held; (B) is a bottom view, and (c) is a right side view.

FIG. 4A is a front view of a high-voltage auxiliary electrode of a cathode ray tube electron gun according to Embodiment 2 of the present invention, and FIG.
Is a bottom view, and (c) is a right side view.

FIG. 5A is a front view showing a state in which a high-voltage side auxiliary electrode and a low-voltage side auxiliary electrode of a cathode ray tube electron gun according to Embodiment 2 of the present invention are implanted in an insulating support and fixed and held; (B) is a bottom view, and (c) is a right side view.

6A is a front view of a high-voltage side auxiliary electrode of a cathode ray tube electron gun according to Embodiment 3 of the present invention, and FIG.
Is a bottom view, and (c) is a right side view.

FIG. 7 (a) shows a high-voltage auxiliary electrode of a cathode ray tube electron gun according to Embodiment 3 of the present invention implanted and fixedly held in one insulating support, and a low-voltage auxiliary electrode mounted on the other insulating support. It is a front view showing the state implanted and fixed and held in the body, (b) is a bottom view, and (c) is a right side view.

FIG. 8 (a) is a front view showing a state in which a high-voltage side auxiliary electrode and a low-voltage side auxiliary electrode of a cathode ray tube electron gun according to Embodiment 4 of the present invention are implanted in an insulating support and fixedly held; (B) is a bottom view, (c) is a right side view, and (d) is a cross-sectional view taken along line VIII (d) -VIII (d) in FIG. 8 (a).

FIG. 9 is an explanatory view of a conventional electron gun for a cathode ray tube.

FIG. 10A is a front view of a high-voltage side auxiliary electrode or a low-voltage side auxiliary electrode of a conventional electron gun for a cathode ray tube, and FIG.
Is a bottom view, and (c) is a right side view.

11A is a front view showing a state in which a high-voltage side auxiliary electrode and a low-voltage side auxiliary electrode of a conventional cathode ray tube electron gun are implanted and fixedly held in an insulating support; FIG. The bottom view and (c) are right side views.

[Description of Signs] 35, 45, 55 High-voltage side auxiliary electrodes 36, 46, 56 Low-voltage side auxiliary electrodes 37a, 37b Insulating supports 35a, 45a, 55a Electron beam passage ports 35b, 35c, 36b, 36c, 45b, 45c, 4
6b, 46c, 55b, 55c, 56b, 56c Ridge 67c, 67d Groove D31 Creepage distance x-axis, y-axis Cartesian coordinate axis I First quadrant II Second quadrant III Third quadrant IV Fourth quadrant

Claims (5)

[Claims] 1. An electron gun for a cathode ray tube having an electron beam passage opening and at least two electrodes facing each other fixedly held on an insulating support, wherein one of the electrodes has a raised portion, and the raised portion has An electron gun for a cathode ray tube, wherein a recessed portion of the other electrode is provided at a position distant from a position corresponding to the provided position. 2. One of the electrodes virtually takes a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on a surface of the electrode having an electron beam passage opening.
A raised portion is provided in each of the quadrants and the third quadrant, and a raised portion is provided in the other electrode in the second and fourth quadrants of the quadrant, respectively. 2. The electron gun for a cathode ray tube according to claim 1, wherein the electron gun is fixedly held. 3. One of the electrodes virtually takes a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on a surface of the electrode having an electron beam passage opening.
An indentation is provided in each of the quadrants and the fourth quadrant, and an indentation is provided in the other electrode in the second and third quadrants of the quadrant, respectively. 2. The electron gun for a cathode ray tube according to claim 1, wherein the electron gun is fixedly held. 4. An electrode has a rectangular coordinate axis and four quadrants divided by the rectangular coordinate axis on a surface of the electrode having an electron beam passage opening.
A raised portion is provided in each of the quadrants and the second quadrant, and a raised portion is provided in the third electrode and the fourth quadrant of the quadrant, respectively, on the other electrode. 2. The electron gun for a cathode ray tube according to claim 1, wherein the electron gun is fixedly held. 5. An indentation provided on both electrodes is implanted in the insulating support, and a groove is provided between the indentations of the insulating support. The electron gun for a cathode ray tube according to any one of claims 1 to 3, wherein a creepage distance of a surface of the cathode ray tube is increased.