JPS61250935A - Inner resistor of cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent deterioration of insulation by forming the zigzag pattern of resistor layer such that the difference between the potential of resistor layer and the surface potential of an insulator film covering said resistor layer will be reduced at the maximum differential potential position. CONSTITUTION:An inner resistor to be assembled in cathode-ray tube together with an electron gun structure is formed by providing high voltage, convergence and earth electrode terminals 2-4 on a seramic substrate 1 then arranging a resistor layer 5' in zigzag. the surface of said resistor layer 5' is covered with an insulation film 6. With reference to the maximum differential potential position P' between the potential of the resistor layer 5a' and the surface potential of the insulation film 6, the pitch of the resistor layer 5a' between the terminals 3, 4 is set to q1 at the terminal 4 side while to q2 at the terminal 3 side where q2>q1 and a pattern section of L1-L3 is formed between the pitch q1 section and the terminal 4. Consequently, the potential difference at the high potential difference section P' can be reduced effectively resulting in improvement of insulation.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G-1 configuration (Figures 1 and 2) G-2 Potential relationship of various parts in a cathode ray tube (FIG. 3) Effects of the invention A Industrial field of application The present invention relates to a built-in resistor that is incorporated together with an electron gun assembly into a tube such as a color cathode ray tube.

B. Summary of the Invention The present invention provides a built-in resistor of a cathode ray tube that is incorporated together with an electron gun assembly into a tube body of the cathode ray tube and supplies a voltage obtained by dividing the anode voltage of the cathode ray tube to the electron gun assembly.
A resistor layer having a zigzag pattern and covered with an insulating film is arranged between a first terminal on the low voltage side and a second terminal on the high voltage side on the insulating substrate. , the resistance value per unit length in the direction connecting the first terminal and the second terminal is a high potential difference site on the insulating substrate where the potential difference between the surface of the insulating coating and the resistor layer is large. The second pattern portion between the high potential difference region and the second terminal is smaller than the first pattern portion between the first terminal, and further,
The half-pitch interval between the first terminal in the first pattern part and the half-pitch of the zigzag pattern from there and the half-pitch interval between the half-pitch and the first pitch are the same as those in the first pattern. By making the interval larger than each half-pitch interval after the first pitch in the section, when the cathode ray tube is assembled into a situation where high voltage is applied during the knocking process of the cathode ray tube, the high voltage It is possible to avoid insulation deterioration or breakdown of the insulating film at the potential difference site and even in the vicinity of the first terminal, and as a result, the change in the resistance value of the resistor layer before and after the knocking treatment of the cathode ray tube is minimized. This is so that it can be suppressed.

C. Prior Art Conventionally, in color cathode ray tubes and the like used in color television receivers, in addition to the anode voltage, high voltages are required to be supplied to convergence electrodes, focus electrodes, etc., for example.

In such cases, it has been proposed to incorporate a resistor for voltage division into the tube together with the electron gun structure as a built-in resistor, thereby dividing the anode voltage to obtain the respective high voltages. As an example of a conventional built-in resistor used in a conventional built-in resistor, those shown in FIGS. 4 and 5 are known.

FIG. 4 shows a conventional built-in resistor 7 seen through from above the insulating coating forming the outer surface, and FIG. 5 shows a side view of the entire conventional built-in resistor 7. As shown in FIG.

In the built-in resistor 7 shown in FIGS. 4 and 5, a terminal portion formed by depositing a conductive layer on an insulating substrate 1 such as a ceramic plate, that is, a high voltage to which a high voltage is supplied. Electrode terminal 2. High voltage for convergence electrodes, i.e.
A convergence electrode terminal (hereinafter referred to as "CV electrode terminal") 3 from which a convergence voltage can be obtained and a ground electrode terminal 4 are provided, and a zigzag shape having a required resistance value is provided between the Cv electrode terminal 3 and the ground electrode terminal 4. A patterned resistor layer 5a is provided between the high voltage electrode terminal 2 and the CV electrode terminal 3, and a resistor layer 5b having the same required resistance value is further provided between the resistor layers 5a and 5b and the CV electrode terminal 3. Fine adjustment resistor layers 5c are respectively deposited between them to form a voltage dividing resistor layer 5. An insulating coating 6 covering the voltage dividing resistor layer 5 is applied to the shaded area in FIG. 4. This insulating coating 6 is formed by drying and firing a fluid material such as lead glass. As shown in FIG. 5, the thickness of the edge portions such as the portions close to each of the Cv electrode terminal 3 and the ground electrode terminal 4 are made small. still,
The fine adjustment resistor layer 5c is provided so that the resistance value of the resistor layers 5a and 5b between each terminal can be adjusted by removing a part of it during the manufacturing process of the built-in resistor 7. ing.

FIG. 6 shows a state in which the built-in resistor 7 having such a configuration is incorporated into a color cathode ray tube. Here, an electron gun assembly 9 is disposed within the neck portion a of the tube body 8, and this electron gun assembly 9 has a first grid electrode Gl and a second grid electrode in common for the three cathodes K. G2. Third grid electrode G3. A fourth grid electrode G4 and a fifth grid electrode G5 are sequentially arranged coaxially. A convergence means 10 is arranged after the fifth grid electrode G5. Each electrode Gl, G2, G3.
G4. G5 and the convergence means 10 are mechanically connected by beading glass 11 while maintaining a predetermined positional relationship with each other, and the third grid electrode G3
and the fifth grid electrode G5 are electrically connected by a conductive wire 13. In addition, the convergence means 10
are electrically connected to the fifth grid electrode G5 via the conductive plate 14, and are connected to the opposing inner deflection electrode plates 10a and 1.
0b, and outer deflection electrode plates 10c and 10d arranged on the outside facing these electrode plates 10a and 10b.

A built-in resistor 7 as shown in FIGS. 4 and 5 is attached to such an electron gun assembly 9, and the high voltage electrode terminal 2 of this built-in resistor 7 is connected to the fifth grid electrode G.
5 and the electrically conductive attachment is connected via a piece 12. A graphite conductive film 15 extending to the inner wall of the neck portion 8a is adhered to the inner wall of the funnel portion 8b of the tube body 8, and a high-pressure supply button, that is, an anode button (not shown) provided on the funnel portion 8b. Anode voltage is supplied through. The conductive plate 14 is provided with a conductive spring 16, and when the conductive spring 16 comes into contact with the graphite conductive film 15, the fifth grid electrode G5. Third grid electrode G3. Convergence means 1
An anode voltage is supplied to the inner deflection electrode plates 10a and 10b of 0 and the high voltage electrode terminal 2 of the built-in resistor 7.

The CV electrode terminal 3 of the built-in resistor 7 is conductive mounted on the piece 17.
The outer deflection electrode plate 10 of the convergence means 10 through
c and 10d, and the convergence voltage obtained at the Cv electrode terminal 3 by dividing the anode voltage by the resistor layers 5a and 5b is connected to the outer deflection electrode plates 10c' and 10d.
supplied to

Further, the ground electrode terminal 4 of the built-in resistor 7 is connected to a ground electrode terminal pin 19 embedded through the stem 18 at the base of the neck portion 8a of the tube body 8, and the ground electrode terminal 4 is connected directly or via an external adjustment resistor. Grounded.

In such a color cathode ray tube, for example, the electron gun assembly 9
If there are sharp protrusions or the like in each part, undesirable discharge will occur during actual use. Therefore, in the manufacturing process, parts of the electron gun assembly 9 that are likely to generate electric discharge, such as sharp protrusions, are melted and shaped by generating electric discharge in advance, so that the parts that are likely to generate electric discharge during actual use after the finished product Knocking processing is performed for the purpose of stabilizing operation. In such a knocking treatment process, for example, the
The tripled high voltage (knocking voltage) is applied to the third grid electrode G3. The voltage is applied to the fifth grid electrode G5 and the high voltage electrode terminal 2 of the built-in resistor 7, and the voltage is applied to the first grid electrode G5. 2nd and 4th
Each of the grid electrodes Gl, G2, and G4 is grounded. During this knocking process, the surface of the insulating coating 6 of the built-in resistor 7, except for a part, is charged to a relatively high potential.
On the low voltage side of the resistor layer 5a forming the resistor layer 5a, a larger potential difference is applied than during actual operation.

In FIG. 7, the horizontal axis represents the distance from the ground electrode terminal 4, which is the low voltage side, to the CV electrode terminal 3, which is the high voltage side, on the insulating substrate 1 of the built-in resistor 7, and the vertical axis represents the distance. Taking the voltage ■, the surface potential of the insulating coating 6 of the built-in resistor 7 during knocking treatment (curve a), the earth electrode terminal 4 and CV
The potential of each part of the resistor layer 5a disposed between the electrode terminal 3 (curve b) and the difference between the two potentials is shown as a curve C).

As is clear from this, for example, a position P close to the third grid electrode G3 on the insulating substrate l to which a high voltage is applied
In the portion of the resistor layer 5a having a relatively low potential, the resistor layer 5a and the insulating liquid II! Therefore, the maximum potential difference is applied to the insulating coating 6 at this position (maximum potential difference K) p. Therefore, in the vicinity of the third grid electrode G3, the insulating coating 6
A potential exceeding the breakdown voltage of the resistor layer 5a may be applied, causing insulation deterioration or breakdown of the insulating coating 6, and as a result, the resistor layer 5a may be damaged and its resistance value may change significantly.

To solve the problem of the change in resistance value of the resistor layer 5a due to insulation deterioration or breakdown, it is advantageous to increase the thickness of the insulating coating 6 to increase the withstand voltage.

That is, by forming the insulating film 6 to be thick, it is possible to prevent insulation deterioration or breakdown of the insulating film 6 and to suppress changes in the resistance value of the resistor layer 5a. However, increasing the thickness of the insulating coating 6 for the built-in resistor 7 is disadvantageous in terms of cost. 7, and the insulating coating 6 peels off from the insulating substrate 1 or cracks occur due to the thermal cycle of temperature rise during use and temperature fall when not in use, resulting in inconveniences that lead to a decrease in reliability. become.

In order to solve the above-mentioned problem, the applicant of the present application has proposed a built-in resistor for a cathode ray tube as described in Japanese Patent Application No. 58-238244. An example of the previously proposed built-in resistor has a zigzag pattern between the ground electrode terminal on the low voltage side and the CV electrode terminal on the high voltage side on the insulating substrate, The resistor layer covered with the insulating film adjusts the meandering pitch of the zigzag pattern between the ground electrode terminal and the high potential difference area corresponding to the position of the maximum potential difference, and adjusts the meandering pitch of the zigzag pattern between the high potential difference area and the CV electrode terminal. The resistance value of the resistor layer per unit length in the direction connecting the earth electrode terminal and the CV electrode terminal is set to be smaller than the meandering pitch of the zigzag pattern in the high potential difference area and the CV electrode terminal. The potential difference is made larger between the ground electrode terminal and the high potential difference region than between the ground electrode terminal and the high potential difference region. In such a built-in resistor, the potential rise gradient of the resistor layer from the ground electrode terminal on the insulating substrate to the high potential difference area is steep, and the potential of the resistor layer is The electric potential difference applied to the insulating film is reduced because the electric potential is increased as a whole except for both ends of the area. Therefore, when attached to the electron gun assembly of a color cathode ray tube and used for knocking treatment of the color cathode ray tube, care must be taken to prevent insulation deterioration or breakdown of the insulation coating, especially in areas where a large potential difference is applied. This prevents a significant change in the resistance value of the resistor layer before and after the knocking treatment.

D Problems to be Solved by the Invention As described above, resistor layer per unit length in the direction connecting the earth electrode terminal and the CV electrode terminal on the insulating substrate on which the resistor layer having a zigzag pattern is arranged. If the built-in resistor has a resistance value greater between the ground electrode terminal and the high potential difference part than between the high potential difference part and the CV electrode terminal, the electronic resistance of the color cathode ray tube When the color cathode ray tube is attached to a gun and subjected to knocking treatment, the potential rise gradient of the resistor layer from the ground electrode terminal on the insulating substrate to the high potential difference area is steep, and the ground electrode A relatively large potential difference is applied between the terminal and the half-pitch and l-th pitch of the zigzag pattern of the resistor layer with a relatively small interval. On the other hand, the insulating coating that covers the resistor layer on the insulating substrate is formed by coating a fluid insulating material such as lead glass on the insulating substrate, then drying and baking it, so that it is not close to the ground electrode terminal. The thickness of the edge portion relative to the insulating substrate is made relatively small. For this reason, when a color cathode ray tube is subjected to a high voltage application during knocking treatment, the zigzag pattern of earth, electrode terminals and resistor layers arranged at relatively small intervals on an insulating substrate must be Between the half-pitch and the first pitch, a potential difference that exceeds the withstand voltage limit is applied to the edge of the insulating coating, which has a relatively small thickness with respect to the insulating substrate, and the insulation of the insulating coating deteriorates. Deterioration or destruction occurs, and as a result, the half-pitch or first-pitch portion of the zigzag pattern from the ground electrode terminal of the resistor layer is damaged, and its resistance value changes significantly before and after the knocking treatment. There is a possibility.

In view of this, the present invention provides a zigzag pattern between a first terminal on the low voltage side and a second terminal on the high voltage side among the plurality of electrode terminals provided on an insulating substrate. A resistor layer is formed, and this resistor layer is covered with an insulating film, and is incorporated into a cathode ray tube together with an electron gun assembly, so that high voltage during knocking treatment of the cathode ray tube is When placed under conditions where
Insulation deterioration or breakdown of the insulating coating can be effectively avoided even in areas with high potential difference, and even in the vicinity of the first terminal.
As a result, it is possible to minimize the change in the resistance value of the resistor layer before and after the knocking treatment of the cathode ray tube.
It is an object of the present invention to provide a built-in resistor for a cathode ray tube that does not cause disadvantages in terms of manufacturing cost or reliability.

E Means for Solving the Problems In order to achieve the above-mentioned object, the built-in resistor of a cathode ray tube according to the present invention includes an insulating substrate, a plurality of electrode terminals formed on the insulating substrate, and a plurality of electrode terminals formed on the insulating substrate. An insulating coating is provided on an insulating substrate between a first terminal on the low voltage side and a second terminal on the high voltage side of the electrode terminals, and an insulating coating is provided on the insulating substrate. A resistor layer formed in a zigzag pattern and covered with the insulating film is disposed between the second terminal and the second terminal, and the resistor layer includes:
A high potential difference site on an insulating substrate where the resistance value per unit length in the direction connecting the first terminal and the second terminal is a large difference between the surface potential of the insulating coating and the potential of the resistor layer. The second pattern portion between the high potential difference region and the second terminal is smaller than the first pattern portion between the high potential difference region and the first terminal, and the first pattern portion in the first pattern portion The half-pitch interval between the terminal and the half-pitch interval of the zigzag pattern from there, and the half-pitch interval between the first half-pitch and the first pitch, are larger than each half-pitch interval after the first pattern in the first pattern part. It is said to be large.

F action The built-in resistor of the cathode ray tube according to the present invention configured as described above is incorporated in the cathode ray tube together with the electron gun assembly, and is resistant to high voltage applied during knocking treatment of the cathode ray tube. In the case where the resistor layer is placed in The electrical potential difference applied to the insulating film covering the resistor layer is thereby reduced, and in addition to this, the first The interval between the terminal and the half-pitch and first pitch of the zigzag pattern from there is relatively large, so that the potential rise gradient therebetween is relatively gentle. As a result, the potential difference applied to the insulating film covering the resistor layer is reduced even at high potential difference parts.Also, the thickness of the insulating film relative to the insulating substrate is small, and the zigzag pattern between the earth electrode terminal and the resistor layer Even between the first pitch and the first pitch, the insulation coating will not deteriorate or break, and a significant change in the resistance value of the resistor layer before and after the knocking treatment of the cathode ray tube will be prevented. Become.

G Example G-1 Configuration (Figures 1 and 2) Figure 1 shows an example of the built-in resistor of the cathode ray tube according to the present invention, and Figure 2 shows the example shown in Figure 1. A cross section taken along the line ■-■ is shown. Similar to the built-in resistor 7 shown in FIGS. 4 and 5, this example is formed by disposing a voltage dividing resistor layer on an insulating substrate and providing an insulating film to cover it. In FIG. 1, the state seen through from above the insulating coating forming the outer surface portion is shown. In addition, the first
In FIGS. 4 and 2, parts corresponding to those shown in FIGS. 4 and 5 are denoted by the same reference numerals as in FIGS. Omitted.

In the example shown in FIGS. 1 and 2, a resistor layer for adjustment has a zigzag pattern and is arranged between a CV electrode terminal 3 and a ground electrode terminal 4 on an insulating substrate 1. 5'C1, a resistor layer 5'b and a fine adjustment resistor layer 5'c2 arranged between the high voltage electrode terminal 2 and the CV electrode terminal 3. The divided voltage resistor layer 5'' formed by the resistor layers 5a and 5b and the fine adjustment resistor layer 5c in the built-in resistor 7 shown in FIG. 4 and FIG. It is provided to correspond to the body layer 5. Further, on the insulating substrate 1, an insulating coating 6 is disposed to cover the voltage dividing resistor layer 5'.

The voltage dividing resistor N5' has, for example, a uniform cross-sectional area and is formed as a fired body obtained by firing a uniform resistance material, such as a high-resistance ruthenium oxide paste.

The resistor layer 5"a constituting a part of the voltage dividing resistor layer 5" has a zigzag pattern with a constant meandering width as a whole. Corresponding to the maximum potential difference position P in the built-in resistor 7 shown in FIGS. 4 and 5, for example, when installed together with the electron gun assembly 9 in a cathode ray tube as shown in FIG. The ground electrode terminal 4 is arranged between the maximum potential difference position P°, which is the position where the difference between the surface potential of the insulating coating 6 and the potential of the resistor layer 5+a is maximum.
The first pattern part 5°al has a meandering pitch of the zigzag pattern with a small pitch q, except for the starting end near the
Following this, the maximum potential difference position P° and the high voltage side C
The second pattern portion 5''ah is disposed between the V electrode terminal 3 and has a zigzag pattern with a large meandering pitch qz (qz > q,).

The first pattern portion 5'aβ is not designed such that the meandering pitch of the zigzag pattern is a small pitch q at the starting end close to the ground electrode terminal 4, and the ground electrode terminal 4 and the ground electrode terminal 4 are The half-pitch partial molecule of the zigzag pattern is separated by a distance L1, and furthermore, the half-pitch partial molecule and the first pitch partial molecule t are separated by a distance Lt.
It is assumed that the meandering pitch of the zigzag pattern is set as a small pitch q1 in the sub-molecule 3 and above at the continuation<1.5th pitch. Here, the distances L1 and t are distances corresponding to 1/2 of the small pitch q1, respectively.
For example, the distance L3 from the first pitch part molecule 2 to the 1.5th pitch part molecule l of the first pattern portion 5'af is selected to be larger than the distance L3, for example, 172 of the above-mentioned large pitch q2.
is assumed to be equal to the distance corresponding to .

Since the first pattern portion 5'aβ and the second pattern portion 5'ah forming the resistor layer 5+a have a zigzag pattern as described above, the insulating substrate 1
What is the maximum potential difference with the upper earth electrode terminal 4? The effective length of the first pattern portion 5'al within a unit length between I P' and CV The second pattern portion 5'ah within the unit length between the electrode terminal 3
Therefore, the resistance value of the resistor layer 5°a per unit length between the earth electrode terminal 4 and the maximum potential difference MP' is the value between the maximum potential difference position P° and the CV electrode terminal 3. The resistance value per unit length of the resistor layer 5'a is greater than that of the resistor layer 5'a. In addition, in the region where the starting end of the first pattern portion 5'aIl close to the ground electrode terminal 4 is arranged,
The first pattern portion 5'am! within the unit length. The effective length of is smaller than the area where other parts of the first pattern portion 5taβ are arranged, and for example, the effective length of the maximum potential difference positions P′ and C
This is equivalent to the resistance value of the resistor layer 5''a per unit length between the V electrode terminal 3 and the resistor layer 5''a.

On the other hand, the insulating film 6 that covers the voltage-dividing resistor layer 5° on the insulating substrate 1 is formed by, for example, applying fluidized lead glass onto the insulating substrate 1 and then drying and firing it.
As shown in FIG. 2, the thickness t with respect to the insulating substrate 1
is generally constant, but is thinner at the edge near the ground electrode terminal 4 than at other parts, for example.

Potential relationship of each part in the G-2 cathode ray tube (Fig. 3) The built-in resistor shown in Fig. 1 configured as described above is installed in the electron gun assembly 9 of the color cathode ray tube as shown in Fig. 6. , installed in the same manner as the conventional built-in resistor 7,
When a knock jig voltage is applied to the high-voltage electrode terminal 2 during knocking treatment of the color cathode ray tube, the surface potential of the insulating coating 6 and the potential of each part of the resistor layer 5''a are as shown in FIG. It will be like this.

FIG. 3 shows a graph in which the horizontal axis represents the distance from the ground electrode terminal 4 to the CV electrode terminal 3 side on the insulating substrate l, and the vertical axis represents the voltage V. As is clear from this, the potential of each part of the resistor layer 5'a is different from the potential of each part of the resistor layer 5'a located between the ground electrode terminal 4 of the resistor layer 5'a and the maximum potential difference position P', as shown by the curve b°. Maximum potential difference position P'' from the rear end of the starting end in pattern section 5'a2 of 1
The potential rise gradient from the maximum potential difference position P' to the CV electrode terminal 3 becomes steep, and the CV voltage rises from the maximum potential difference position P° in the second pattern portion 5'ah arranged between the maximum potential difference position P' and the CV electrode terminal 3. The potential rise gradient applied to terminal 3 becomes gentle. Therefore, the potential of each part of the resistor layer 5'a is greater than the maximum potential difference WP'' compared to the potential of each part of the resistor layer 5 in the case of the conventional built-in resistor 7, which is shown by the curve in FIG. As a result,
The difference between the surface potential of the insulating coating 6 of the built-in resistor of FIG. 1 and the potential of the resistor layer 51a, which is indicated by the curve a'' in FIG. 7, it is reduced throughout the insulating coating 6, and is particularly significantly reduced at the maximum potential difference position P' and its vicinity.Then, the built-in resistance shown in FIG. In the case of the resistor layer 5'a, the resistor layer 5'a is set so that the potential difference applied to the insulating coating 6 at the maximum potential difference Rp' reduced in this way is smaller than the withstand voltage limit of the insulating coating 6.
The effective length of the first pattern portion 5° ag and the effective length of the second pattern portion 5″ah are selected.

Furthermore, at the starting end of the first pattern portion 518β of the resistor layer 5°a, the distance from the ground electrode terminal 4 to the half-pitch molecule of the zigzag pattern, and the half-pitch Since the distance L2 from the partial molecule 1 to the first pitch partial molecule 2 is larger than the distance corresponding to 172 of the pitch q1 in other parts of the first pattern portion 5''al, the potential increase gradient is As a result, there is a relatively large distance between the ground electrode terminal 4 and the half-pitch portion of the zigzag pattern of the first pattern portion 5'aIl and the half-pitch portion of the zigzag pattern 2. Initially, a relatively small potential difference is applied between the ground electrode terminal 4 and the half pitch part molecule 1 and the first pitch part molecule 2 of the zigzag pattern of the first pattern part 51 a7! The thickness of the insulating coating 6 will be substantially increased, and the potential difference across the insulating coating 6 will be relatively small.In this case, the above-mentioned distance and L2 will be Electrode terminal 4 and first pattern portion 5”al
At the edge of the insulating coating 6 whose thickness with respect to the insulating substrate 1 is small between the half-pitch partial element and the first-pitch partial element 2 of the zigzag pattern, the voltage exceeds its withstand voltage limit. Selected so that no potential difference is applied,
As described above, the distance is, for example, equal to 1/2 of the large pitch qt in the second pattern portion 5'ah of the resistor IW5'a.

Note that at the starting end of the first pattern portion 5°all of the resistor layer 5'a, the potential increase gradient is made gentler, so that the surface potential of the insulating coating 6 and the potential of the resistor layer 5'a are equal to each other. Although the difference will not be reduced, the surface potential of the insulating coating 6 is sufficiently low in such a portion, and the difference between the surface potential of the insulating coating 6 and the potential of the resistor layer 5''a is originally small, so this problem is not caused. do not have.

As described above, in the built-in resistor shown in FIGS. 1 and 2, the same as the conventional built-in resistor 7 can be used in the electron gun assembly 9 of the color cathode ray tube as shown in FIG. In the case where the color cathode ray tube is subjected to knocking treatment, insulation deterioration of the insulating coating 6 occurs both at the maximum potential difference position P' on the insulating substrate 1 and in the vicinity of the ground electrode terminal 4. Otherwise, destruction is avoided, and as a result, a change in the resistance value of the resistor layer 5°a before and after the knocking treatment is suppressed.

H Effects of the Invention As is clear from the above explanation, when the built-in resistor of the cathode ray tube according to the present invention is incorporated together with the electron gun assembly into the tube of the cathode ray tube and a voltage is applied, The potential of the resistor layer arranged in a zigzag pattern between the first terminal on the low voltage side and the second terminal on the high voltage side is transferred from the first terminal to the second terminal on the insulating substrate. The surface of the insulating film covering the resistor layer on the insulating substrate is such that the rising gradient toward the high potential difference region formed between the first terminal and the second terminal is steep. The potential difference between the potential and the potential of the resistor layer is significantly reduced, especially at high potential difference sites, and the half-pitch and l-pitch of the zigzag pattern from there of the first terminal and the resistor layer Between the eyes, the distance between them is relatively large, and the potential increase gradient of the resistor layer between them is made relatively gentle, and the thickness of the insulating film there is substantially increased. Since the potential difference applied to the insulating coating is made relatively small, when a cathode ray tube is placed under a situation where a high voltage is applied during the knocking process, even in a high potential difference area, there is a small potential difference in the vicinity of the first terminal. Also, there is no risk of insulation deterioration or breakdown of the insulating film, and it exhibits excellent characteristics that can suppress changes in the resistance value of the resistor layer to a minimum.

Moreover, in order to prevent insulation deterioration or destruction of the insulation coating,
Since the technique does not involve increasing the film thickness, there are no disadvantages such as overall warpage or peeling of the insulating film from the insulating board due to the difference in thermal expansion coefficient between the insulating substrate and the insulating film. Furthermore, it has the advantage that it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the built-in resistor of a cathode ray tube according to the present invention, and FIG.
3 is a characteristic diagram used to explain the potential relationship in each part when the example shown in FIG. 1 is incorporated into a cathode ray tube, and FIGS. A plan view and a side view showing the built-in resistor of a cathode ray tube.
7 is a schematic configuration diagram showing the main parts of a cathode ray tube incorporating the built-in resistor shown in FIG. FIG. In the figure, 1 is an insulating substrate, 2 is a high-voltage electrode terminal, 3 is a convergence electrode terminal, 4 is a ground electrode terminal, 5 and 5'' are voltage-dividing resistor layers, and 5°a is a voltage-dividing resistor layer 5. In the resistor layer, 5'af is a first pattern portion, 5''ah is a second pattern portion, and 9 is an electron gun structure. FIG. 1 FIG. 2 FIG. 3 A plan view of a conventional built-in resistor A side view of a conventional built-in resistor FIG. 5 FIG. 6

Claims (1)

[Claims] An insulating substrate, a plurality of electrode terminals formed on the insulating substrate, a first terminal on the low voltage side and a second terminal on the high voltage side among the plurality of electrode terminals. an insulating coating provided on the insulating substrate between the terminal and the first terminal and the second terminal on the insulating substrate, the zigzag pattern being covered by the insulating coating; and the resistance value per unit length in the direction connecting the first terminal and the second terminal is
A first pattern portion between a high potential difference site on the insulating substrate and the first terminal, where the potential difference between the surface of the insulating coating is large, is arranged between the high potential difference site and the first terminal. The second pattern portion between the two terminals is smaller, and the half pitch between the first terminal in the first pattern portion and the half pitch of the zigzag pattern from there. a resistor layer in which the interval and the half-pitch interval between the half-pitch and the first pitch are larger than each half-pitch interval after the first pitch in the first pattern section; Built-in resistor of cathode ray tube.