JPS60227342A - Cathode-ray tube device - Google Patents

Abstract

PURPOSE:To effectively control change of resistance value of resistance layer by providing a conductive protection plate with the end portion connected to the electrode of electron gun structure between a comprised resistor and an electron gun structure. CONSTITUTION:A conductive protection plate 30 which is arranged so as to cover a second grid electrode G2 and a third grid electrode G3 and is set in the same potential as a fourth grid G4 and connecting member 30b is provided between a comprised resistor 7 and an electron gun structure 2. Thereby, during the knocking process, charges at the surface of insulated film 20 of comprised resistor 7 is reduced at the area where the conductive protection plate 30 is arranged and deterioration of insulation and breakdown of insulation film 20 can be prevented. Moreover, during actual operation, temperatue rise by straight heat of resistance layer can also be set lower. As a result, change of resistance value of comprised resistor 7 becomes very small in any cases.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cathode ray tube device with a built-in electron gun assembly used in color television receivers and the like.

BACKGROUND ART AND PROBLEMS Conventionally, some color cathode ray tubes and the like used in color television receivers require high voltages to be supplied to convergence electrodes, focus electrodes, etc. in addition to the anode voltage. In such a case, a voltage dividing resistor is built into the neck along with the electron gun as a built-in resistor.
It has been proposed to divide the anode voltage to obtain respective high voltages.

An example of a color cathode ray tube incorporating such a built-in resistor is shown in FIG. Reference numeral 1 denotes a tube body, and an electron gun structure 2 is disposed within the neck portion la of the tube body 1. This electron gun structure 2 has a first grid electrode Gl, a common electrode for three cathodes K, Second grid electrode G2. Third grid electrode G3. A fourth grid electrode G4 and a fifth grid electrode G5 are sequentially arranged coaxially. A convergence means 3 is arranged after the fifth grid electrode G5. Each grid electrode G1, G2.
G3. G4 and G5 and the convergence means 3 are mechanically connected by beading glass 4 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 5. Further, the convergence means 3 is electrically connected to the fifth grid electrode G5 via the conductive plate 6, and has inner deflection electrode plates 3a and 3b facing each other, and an outer side facing the inner deflection electrode plates 3a and 3b. The outer deflection electrode plates 3C and 3d are arranged as shown in FIG.

A built-in resistor 7 is attached to such an electron gun structure 2, and a high-voltage electrode terminal 8 provided on the built-in resistor 7 is electrically connected to the fifth grid electrode G5 through a piece 9. The convergence electrode terminal (hereinafter referred to as C
V electrode terminals) 10 are electrically conductive attached via pieces 11 to the outer deflection electrode plates 3C and 3d of the convergence means 3.
Connected to.

Further, the earth electrode terminal 12 is connected to an earth electrode terminal pin 14 which is embedded through the stem 13 at the base of the neck portion 1a of the tube body 1 via a conductive piece 1-J piece 15.

Further, a graphite conductive film 16 extending to the inner wall of the neck portion 1a is adhered to the inner wall of the funnel portion 1b of the tube body 1, and a high pressure supply button, that is, an anode button (not shown) provided on the funnel portion 1b The anode voltage is supplied through the A conductive spring 17 is provided on the conductive plate 6, and when the conductive spring 17 comes into contact with the graphite conductive film 16, the fifth grid electrode G5. Third grid electrode G3. An anode voltage is supplied to the inner deflection electrode plates 3a and 3b of the convergence means 3 and the high voltage electrode terminal 8 of the built-in resistor 7.

The fourth grid electrode G4 is connected via a conductive wire 23 to an electrode terminal pin 24 embedded through the stem 13 to which a predetermined voltage is applied.

The built-in resistor 7 incorporated in such a cathode ray tube has a configuration as shown in FIGS. 2 and 3. FIG. 2 shows the built-in resistor 7 seen through from above the insulating coating forming the outer surface, and FIG. 3 shows a side view of the entire built-in resistor 7. As shown in FIG. In the built-in resistor 7 shown in FIGS. 2 and 3, a terminal portion is formed by depositing a conductive layer on an insulating substrate 18 such as a ceramic plate, that is, a high voltage to which an anode voltage is supplied. Electrode terminal 8° High voltage for convergence electrode, that is, C from which convergence voltage can be obtained Electrode terminal 10 and ground electrode terminal 1
A resistor layer 19a having a zigzag pattern having a predetermined resistance value is provided between the CV electrode terminal 10 and the earth electrode terminal 12.
It also has a predetermined resistance value between it and the electrode terminal 10.
A resistor layer 19b having a zigzag pattern is further deposited, and a resistor layer 19c for fine adjustment is deposited between the resistor layers 19a and 19b and the CV electrode terminal 10, respectively, to form a voltage dividing resistor layer 19. is formed. An insulating coating 20 made of lead glass or the like is provided on the shaded area in FIG. 2, covering the voltage dividing resistor layer 19. Note that the fine adjustment resistor layer 19c is formed during the manufacturing process of this built-in resistor 7.
By removing a part of it, the resistor layer 1 between each terminal
It is provided so that the resistance values of 9a and 19b can be checked.

When the built-in resistor 7 configured as described above is installed together with the electron gun assembly 2 in the neck portion a of the cathode ray tube, the voltage is supplied to the CV electrode terminal 10 and the high voltage electrode terminal 8. Anode voltage is resistor Ji19a and 19b
A convergence voltage is obtained by dividing the voltage, and this convergence voltage is supplied to the outer deflection electrode plates 3C and 3d. Further, the earth electrode terminal 12 is passed through the earth electrode terminal pin 14 of the tube body 1 and is normally grounded via an external variable resistor for adjustment.

If such a cathode ray tube has, for example, sharp protrusions on various parts of the electron gun assembly 2, undesirable discharge will occur during actual use.

Therefore, in the manufacturing process of cathode ray tubes, parts of the electron gun assembly 2 that are likely to generate electric discharge, such as sharp protrusions, are melted and molded after generating electric discharge in advance, so that the actual parts after being made into a finished product are Nooking processing is performed for the purpose of stabilizing the operation during use. In such a knocking treated row culm, for example, a high voltage (knocking voltage) that is two to three times higher than that during actual operation of a cathode ray tube is applied.
However, the third grid electrode G3. The voltage is applied to the fifth grid electrode G5 and the high voltage electrode terminal 8 of the built-in resistor 7, and the first
．． Each of the second and fourth grid electrodes Gl.

G2 and G4 are grounded. During this knocking process, the surface of the insulating coating 20 of the built-in resistor 7, except for a part, is charged to a relatively high potential, and in particular, the voltage dividing resistor layer 19 is formed on this insulating coating 20. A larger potential difference is applied on the low voltage side of the resistor layer 19a compared to during actual operation.

Here, the surface of the insulating coating 20 is charged between each grid electrode of the electron gun assembly 2, that is, between the second and third grid electrodes G.
Between 2 and 03, 3rd and 4th grid electrode G3 and 04
Low pressure caused by electrical discharge between spaces, etc.

This occurs when emitted electrons (cold emission) from the electrode side to the high voltage electrode side reach the built-in resistor 7 and further the inner wall surface of the neck portion 1a.

FIG. 4 shows the CV electrode terminal 10 on the insulating substrate 18 of the built-in resistor 7 attached to the cathode ray tube shown in FIG. 1 from the ground electrode terminal 12 on the low voltage side to the CV electrode terminal 10 on the high voltage side on the horizontal axis. The insulation coating 2 of the built-in resistor 7 during the knocking process is shown by taking the distance to the side and taking the potential ■ on the vertical axis.
The surface potential of 0 (curve a), the potential of each part of the resistor layer 19a arranged between the earth electrode terminal 12 and the CV electrode terminal 10 (curve b), and the difference between the two potentials (curve C) are shown. As is clear from this, at a position P on the insulating substrate 18 close to the third grid electrode G3 to which a high voltage is applied,
The potential difference between the resistor layer 19a and the surface of the insulating coating 20 is maximum at a portion of the resistor layer 19a that has a relatively low potential. The maximum potential difference will be applied. Therefore, a potential exceeding the withstand voltage of the insulating coating 20 is applied near the third grid electrode G3, causing insulation deterioration or breakdown of the insulating coating 20, and as a result, the resistor layer 19a is damaged and its resistance value is significantly reduced. There is a risk that this may change.

Regarding the change in resistance value of the resistor layer 19a due to such insulation deterioration or breakdown, increase the thickness of the insulation coating 20,
It is advantageous to increase the pressure resistance.

However, for the built-in resistor 7, it is disadvantageous in terms of cost that the film thickness of the insulating coating 20 is increased unnecessarily.
In addition, the entire built-in resistor 7 warps due to the difference in expansion coefficient between the insulating substrate 18 and the insulating coating 20, and the insulating coating 20 is warped due to a thermal cycle of temperature rise during use and temperature fall when not in use.
This results in problems that lead to a decrease in reliability, such as the 0 peeling off from the insulating substrate 18 or the formation of cracks.

In addition, during actual operation of the cathode ray tube, the voltage dividing resistor layer 19
Self-heating is caused by a continuous flow of emitted electrons, called stray, between the grid electrodes of the electron gun assembly 2 from the high voltage electrode side to the low voltage electrode side, colliding with the voltage dividing resistor layer 19. The temperature of the voltage dividing resistor layer 19 increases due to the addition of stray heat, but if the anode voltage of the cathode ray tube, and therefore the voltage applied to the voltage dividing resistor layer 19, is relatively high, such temperature increase As a result, a change in the resistance value of the voltage dividing resistor layer 19 also occurs.

Purpose of the Invention In view of the above, the present invention includes an electron gun structure in the neck portion,
Equipped with a built-in resistor formed by providing a resistor layer and an insulating coating covering the resistor layer on an insulating substrate, effectively avoiding insulation deterioration or breakdown of the insulating coating of the built-in resistor during knocking treatment. This makes it possible to suppress changes in the resistance value of the resistor layer before and after the knocking treatment, as well as effectively suppress changes in the resistance value of the resistor layer due to stray heat during actual operation. The purpose of the present invention is to provide a cathode ray tube device that has the following characteristics.

Summary of the Invention A cathode ray tube device according to the present invention includes an electron gun assembly and a built-in resistor formed in a neck portion by having a resistor layer disposed on an insulating substrate and an insulating coating covering the resistor layer. The built-in resistor is placed between the built-in resistor and the electron gun structure at a position corresponding to a high potential difference area where the difference between the surface potential of the insulating film of the built-in resistor and the potential of the resistor layer is large. , and a conductive protection plate whose end portion is connected to an electrode of the electron gun assembly.

By doing this, cold emissions that occur between the electrodes of the electron gun assembly during the noking process, and strays that occur between the electrodes of the electron gun assembly during actual operation, can be prevented from being caused by the built-in resistor. can be blocked by a conductive protection plate so that the amount reaching the inner wall surface of the neck is significantly reduced, and as a result, the insulation coating of the built-in resistor is prevented from deteriorating or being destroyed during the knocking process. It is possible to effectively suppress a change in the resistance value of the resistor layer due to heat generation and a change in the resistance value of the resistor layer due to stray heat during actual operation.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

5A and 5B each show a main part of an example of a cathode ray tube device according to the present invention. However, in FIG. 5B, the built-in resistor is omitted. In these FIGS. 5A and 5B, parts corresponding to each part shown in FIG. 1 are shown with the same reference numerals as in FIG. , an insulating coating 2 on the insulating substrate 18 of the built-in resistor 7 between the built-in resistor 7 and the electron gun structure 2;
Positions corresponding to high potential difference sites, including the aforementioned maximum potential difference position P where the difference between the surface potential of the resistor layer 19a and the potential of the resistor layer 19a is large, for example, from the second electrode G2 A conductive protection plate 30 is disposed in a region reaching the fourth grid electrode G4 via the third grid electrode G3, and has an end fixed to the fourth grid electrode G4.

This conductive protection plate 30 covers the second grid/nod electrode G2 and the third grid electrode G3 of the electron gun assembly 2, as shown in a plan view and a side view, respectively, in FIGS. 6A and 6B. The bent portion 30a and the electron gun structure 2 are formed so that
For example, a connection piece 30b to be welded is provided at the fourth electrode G4 at the attachment @30C, for example,
Made of stainless steel.

In this way, between the built-in resistor 7 and the electron gun assembly 2, a conductive protector is arranged to cover the second grid electrode G2 and the third grid electrode G3, and has the same potential as the fourth grid electrode G4. In the cathode ray tube device shown in FIGS. 5A and 5B in which the plate 30 is provided, the conductive protection plate 30 prevents the second grid' electrode G2 and the fourth grid electrode G4 to Grid electrode G
Cold emissions to 3 and 2nd emissions generated during production
Of the strays from the grid electrode G2 and the fourth grid electrode G4 to the third grid electrode G3, the amount of stray that reaches the built-in resistor 7 and furthermore the inner wall surface of the neck portion 1a is significantly reduced. Therefore, during the knocking process, the amount of charge on the surface of the insulating coating 20 of the built-in resistor 7 is reduced at the position where the conductive protection plate 30 is disposed, and the surface potential of the insulating coating 20 is suppressed to a low level. ``A potential difference exceeding the withstand voltage is not applied to the insulating coating 20, so that insulation deterioration or breakdown of the insulating coating 20 is avoided. In addition, even during actual operation, at the position where the conductive protection plate 30 is arranged, the stray that collides with the resistor layer 19a of the built-in resistor 7 is extremely small, and the temperature rises due to the stray heat of the resistor layer 19a. can be kept low. As a result, in either case, the change in resistance value of the resistor layer 19a of the built-in resistor 7 is significantly reduced.

FIGS. 7A and 7B show main parts of another example of the cathode ray tube device according to the present invention. However, in FIG. 7B, the built-in resistor is omitted. This example corresponds to one in which a conductive protection plate 31 having a different shape is provided in place of the conductive protection plate 30 in the example shown in FIGS. 5A and B. The parts other than 31 are constructed similarly to the example shown in FIGS. 5A and 5B.

Here, the conductive protection plate 31 is similar to the conductive protection plate 30 in the example shown in FIGS. 5A and 5B, and the built-in resistor 7
and the electron gun structure 2 at a position corresponding to a high potential difference site P related to the built-in resistor 7, and its end is electrically connected to the fourth grid electrode G4, but mechanical support is not provided. This is done by the insulating substrate 18 of the built-in resistor 7. Therefore, the conductive protection plate 31 has a flat plate portion that faces the second grid electrode G2 and the third grid electrode G3, as shown in FIGS. 8A and 8B, respectively, in a plan view and a side view thereof. 31a, a connecting piece 31b provided at one end of the flat plate portion 31a and brought into contact with the fourth grid electrode G4, and an insulating substrate of the built-in resistor 7 also provided at the other end of the flat plate portion 31a. 18, and an engagement piece 31c for engaging with. And the flat plate part 31
The end portion of the insulating substrate 18 of the built-in resistor 7 is sandwiched between the engaging piece 31c and the connecting piece 31b, and the connecting piece 31b is connected to the fourth grid electrode G4. In addition, both sides of the flat plate part 31a in the longitudinal direction are provided with second and third grid electrodes G2 and G.
It has a narrow bent edge that is bent close to 3.

Even in the cathode ray tube device shown in FIGS. 7A and 7B provided with such a conductive protection plate 31, the same effects as in the example shown in FIGS. 5A and B described above can be obtained.

FIGS. 9A and 9B show the main parts of still another example of the cathode ray tube device according to the present invention. However, the built-in resistor is omitted in FIG. 9B. In this example, a conductive protection plate 32 having a different shape is provided in place of the conductive protection plate 30 in the example shown in FIGS. 5A and B, and the conductive wire 23 is removed. The parts other than the conductive protection plate 32 are constructed similarly to the example shown in FIGS. 5A and 5B.

Here, the conductive protection plate 32 is similar to the conductive protection plate 30 in the example shown in FIGS. 5A and 5B, and the built-in resistor 7
and the electron gun assembly 2 at a position corresponding to a high potential difference site P related to the built-in resistor 7, one end of which is fixed to the fourth grid electrode G4, and the other end is connected to the stem 13. It is connected to an electrode terminal pin 24 buried through the grid, and also serves to connect the fourth grid electrode G4 to the electrode terminal pin 24. Therefore, the conductive protection plate 32 is connected to the second grid electrode G2, as shown in FIGS. 10A and 10B, respectively, in a plan view and a side view thereof.
A flat plate portion 32a facing the third grid electrode G3, and a connecting piece 32b provided at one end of the flat plate portion 32a and welded to the fourth grid electrode G4, for example.
The attachment section 32c includes a retaining piece 32d for connection to the electrode terminal pin 24, which is also provided at the other end of the flat plate section 32a.

In the cathode ray tube device shown in FIGS. 9A and 9B provided with such a conductive protection plate 32, the same effects as in the example shown in FIGS. 5A and B described above can be obtained, and
An independent conducting wire connecting the fourth grid electrode G4 and the electrode terminal pin 24 can be made unnecessary.

Note that the cathode ray tube device according to the present invention may be configured to include conductive protection plates having various shapes and structures other than the conductive protection plates 30, 31 and 32 seen on each side described above. Of course.

Effects of the Invention As is clear from the above description, the cathode ray tube device according to the present invention has a high potential difference area where the potential difference across the insulating coating of the built-in resistor disposed together with the electron gun structure in the neck is large. During the knocking process, cold emissions due to discharge generated between the electrodes of the electron gun assembly can be regulated so that a significantly small amount of them reaches the built-in resistor and the inner wall surface of the neck part.
Furthermore, during actual operation, it is possible to restrict the stray that occurs between the electrodes of the electron gun assembly so that the amount of stray that collides with the resistor layer of the built-in resistor is extremely small. Therefore, during knocking treatment, the surface potential of the insulating coating of the built-in resistor is reduced to make the potential difference across the insulating coating smaller than the withstand voltage of the insulating coating to avoid deterioration or breakdown of the insulating coating. As a result, it is possible to effectively suppress changes in the resistance value of the resistor layer of the built-in resistor, and during actual operation, the generation of stray heat in the resistor layer of the built-in resistor is minimized. It is possible to suppress the temperature rise of the resistor, and as a result, it is possible to effectively suppress a change in the resistance value of the resistor layer of the built-in resistor. In addition, since the cathode ray tube device according to the present application suppresses changes in the resistance value of the resistor layer of the built-in resistor in this way, reliable convergence can be achieved even when the cathode ray tube device is relatively large and has an extremely high anode voltage. This results in excellent reliability in operations, etc.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing the main parts of a cathode ray tube in which a built-in resistor is incorporated, Figure 2 is a plan view showing an example of the built-in resistor in detail, and Figure 3 is the built-in resistor shown in Figure 2. 4 is a characteristic diagram used to explain the potential relationship at each part of the built-in resistor in the cathode ray tube shown in FIG. 1;
FIGS. 5A and 5B are schematic configuration diagrams showing essential parts of an example of a cathode ray tube device according to the present invention, and FIGS. A plan view and a side view showing the protection plate, FIGS. 7A and 7B are a schematic configuration diagram showing the main parts of another example of the cathode ray tube device according to the invention, and FIG. 8A
and B are respectively a plan view and a side view showing the conductive protection plate used in the example shown in FIGS. 7A and B, and FIGS. 9A and B are still another example of the cathode ray tube device according to the present invention. 10A and 10B are a plan view and a side view, respectively, of the conductive protection plate used in the example shown in FIGS. 9A and 9B. In the figure, ■ is the tube body, 1a is the neck part, 2 is the electron gun structure,
7 is a built-in resistor, 1 is an insulating substrate, 19 is a voltage dividing resistor layer, 20 is an insulating coating, and 30, 31 and 32 are conductive protection plates. Figure 5 A JLla base l 4 Figure 7 Figure 9 A Figure 10 A B ld Procedural amendments Showa Otsu q, 29th, Commissioner of the Japan Patent Office Manabu Shiga 4.1 (Chief Examiner of the Japan Patent Office) )-2 1. Indication of the case Showa 7th patent application No. OGLL Visit No. 2, Name of the invention Cathode ray tube device 3, Person making the amendment Relationship to the case Patent applicant address Kitashina Yotsu, Tokyo Parts Co., Ltd. Chome 7-3 left name name
(,2/g) Sony Corporation Representative Norio Oga 4, Agent 150 Address 1-8-6 Shibuya, Shibuya-ku, Tokyo (Miyamasuzaka ST)
Bill) - (1) In the specification, on page 7/line Il, the phrase "high voltage electrode side" is corrected to "low voltage electrode side." (-) Same, on page 9/, the line ``Low voltage positive electrode side'' is corrected to ``High voltage electrode side.''that's all

Claims (1)

[Claims] In the neck part, an electron gun structure, a built-in resistor formed by disposing a resistor layer on an insulating substrate and an insulating coating covering the resistor layer, and a surface of the insulating coating of the built-in resistor. A conductive protection plate is provided between the built-in resistor and the electron gun structure at a position corresponding to a high potential difference site where the difference between the potential and the potential of the resistor layer is large. . A cathode ray tube device, wherein an end of the conductive protection plate is connected to a predetermined electrode of the electron gun assembly.