JP2002093343A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube which is equipped with an electron gun that has a built-in resistor having a good voltage resistance property and focus property. SOLUTION: A resistance pattern 19 is installed on the surface of an insulating plate 18 which constitutes the built-in resistor 12. A first insulating film layer 23a is provided for covering the resistance pattern 19. The first insulating film layer 23a is formed of glass containing a lead oxide of 20 wt.% or more and sodium of 10 ppm-300 ppm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly to a color cathode ray tube having a built-in resistor for applying voltages having different potentials to a plurality of electrodes constituting an electron gun accommodated in a neck portion thereof. About pipes.

[0002]

2. Description of the Related Art A color cathode ray tube used as a monitor tube of a television receiver or an information terminal accommodates an electron gun for emitting a plurality of electron beams at one end of a vacuum envelope, and a plurality of electron guns at the other end. It has a phosphor screen (screen screen) coated with a color phosphor film. A deflection yoke is provided outside the vacuum envelope to display a required image by two-dimensionally scanning an electron beam from an electron gun on a phosphor screen.

Further, many color cathode ray tubes have a shadow mask which is a color selection electrode provided in close proximity to a phosphor screen, and a plurality of electron beams emitted from an electron gun are projected on each phosphor film. A color image is formed.

In order to improve the color image formed on the phosphor screen over the entire screen screen, an electron gun having a system in which a high voltage other than the anode voltage is applied to a plurality of electrodes for focusing an electron beam is provided. A known color cathode ray tube is known.

FIG. 6 is a side view of a main part of a conventional color cathode ray tube accommodating an electron gun having a built-in resistor viewed from a direction perpendicular to an in-line direction, and FIG. 7 is viewed from an arrow A direction in FIG. It is a principal part side view of the direction parallel to the in-line direction.

An electron gun for emitting three electron beams in-line is accommodated in a neck portion 32 of a vacuum envelope 10 of a color cathode ray tube.

This electron gun has an anode (sixth grid electrode) 1 to which the highest voltage (anode voltage) is applied, an intermediate grid electrode 2 to which a voltage divided by a built-in resistor is supplied, and an electron beam. A fifth grid electrode group 3 including a cathode K to be emitted, a plurality of electrodes constituting a lens for converging an electron beam emitted from the cathode K, a fourth grid electrode 4, a third grid electrode 5, 2 grid electrode 6
And a first grid electrode 7 and the like.

Each of the electrodes 1 to 7 has a part of its outer edge embedded in a pair of insulating support rods 9 and is fixed at a predetermined order and at a predetermined interval.

Further, a shield cup 8 is attached to the sixth grid electrode 1.
One end of a conduction spring 11 is welded to a front side surface of the spring. An inner conductive film 10a such as graphite extending from the funnel portion to the neck portion side is applied to the inner wall of the vacuum envelope 10, and the other end of the conduction spring 11 is elastically contacted with the inner conductive film 10a to form a sixth conductive film. An anode voltage is supplied to the grid electrode 1 through a high-voltage terminal sealed in a funnel portion.

A built-in resistor 12 having a structure as described later is attached to one of the insulating support rods 9 of the electron gun outside the insulating support rod 9, that is, on the side of the neck tube wall. The built-in resistor 12 has connection terminals 13, 14, 15; the terminal 13 is connected to the sixth grid electrode 1 to which an anode voltage is applied; the terminal 14 is connected to the intermediate grid electrode 2; 15 is connected to the ground.

That is, the terminal 13 is provided with a connecting piece 13 a projecting in a direction perpendicular to the central axis of the electron gun, and this connecting piece 13 a is connected to the sixth grid electrode 1. A connection piece 14a protrudes from the terminal 14. The connection piece 14a is connected to the intermediate grid electrode 2, and a high voltage obtained by dividing the anode voltage by a resistance ratio is supplied to the intermediate electrode 2. Then, from the terminal 15, the connection lead 15b is connected to the connection piece 15a and connected to the metal piece 17 embedded in the insulating support rod 9. The metal piece 17 is connected to one of the stem pins 45, and is connected to a potential such as ground (hereinafter referred to as ground potential) outside the cathode ray tube via the stem pin 45.

On the other hand, a conductor 16 made of a metal wire has one end connected to the fifth grid electrode group 3 and the other end surrounding the superposed insulating support rod 9 and the built-in resistor 12 at the connection point of the one end. Is the fifth side on the opposite side across the insulating support rod 9.
It is connected to grid electrode group 3. This conductor 16
After enclosing the completed electron gun assembly in the neck portion, high-frequency heating is performed from the outside of the tube to evaporate a part of the metal contained in the conductor 16 to form a metal thin film on the inner wall of the neck tube. On the inner wall of the neck.
The conductor 16 is also known to have a configuration in which a metal wire connecting the same potential electrodes is extended in a tube, and a configuration in which only one end is fixed and the other end is open is used. .

FIGS. 8 (a), 8 (b) and 8 (c) are a plan view, a side view and a rear view for explaining the above-mentioned built-in resistor 12, and FIG. 8 (a) is a plan view as viewed from the resistor pattern side. ,
(B) is a side view, and (c) is a rear view.

The built-in resistor 12 is formed by pattern-printing a resistive material (metal oxide, ruthenium-containing oxide, or the like) having a predetermined resistance characteristic on one surface of an insulating plate 18 preferably made of ceramic, and drying and printing. The fired resistor layer 19 is formed. The resistance value is about several GΩ.

Then, the pattern of the resistor layer 19 (hereinafter, referred to as a pattern)
A first insulating coating layer 2 made of glass, for example, lead borosilicate (borosilicate) glass so as to cover the resistor pattern.
0a is formed. Also, the back surface (back surface) of the insulating plate 18
Similarly, a second insulating film layer 20b is formed.

The glass of these insulating coating layers is Pb
O-SiO ₂ -B ₂ O ₃ system of about 600 ° C in is generally used.

The built-in resistor 12 has a terminal 13 projecting from one end of the built-in resistor 12 and a connecting piece 13 as described above.
a, a terminal 15 projecting to the other end of the sixth grid electrode 1
Is connected to the electrode piece at the ground potential by a connection piece 15a, and the terminal 14 extending in the middle is connected to the intermediate electrode 2 by the connection piece 14a.

That is, a connection piece 13 a projecting in a direction perpendicular to the central axis of the electron gun is attached to the terminal 13, and this connection piece 13 a is welded to the side surface of the sixth grid electrode 1.

A connection piece 14a extends from the terminal 14 in a direction opposite to the connection piece 13a.
a is welded to the intermediate grid electrode 2, and a high voltage obtained by dividing the anode voltage by a resistance ratio is supplied to the intermediate electrode 2.

From the terminal 15, a connection lead 15b is connected to a connection piece 15a projecting in the same direction as the connection piece 13a or 14a, and the metal piece 1 embedded in the insulating support rod 9 is connected.
Connect to 7. The metal piece 17 is connected to one of the stem pins 45, and is connected to a ground potential such as ground outside the cathode ray tube via the stem pin 45.

The connection pieces 13a, 14a and 15a are
Connection leads 13b, 14b connected to the resistor layer 19,
15b is fixed by caulking or the like. The conductive film layers (connection leads) 13b, 14b, and 15b are not covered with the first insulating film layer 20a that covers the resistor layer 19, and are exposed.

A color cathode ray tube having a built-in resistor of this type is disclosed in, for example,
38484, JP-B-62-17347, JP-A-11-191501, and other documents such as "I
DW '99 p517-52 "and the like.

[0023]

In the above-described electron gun, the anode voltage during the operation of the color cathode ray tube supplied to the sixth grid electrode (anode) 1 is usually a high voltage of 25 to 30 kV. During the manufacturing process of the color cathode ray tube, knocking (stabilization at high pressure) after completing the sealing and exhausting processes
Is performed. This involves applying a high voltage about twice the anode voltage during operation of the color cathode ray tube to the anode to forcibly generate a spark between the electrodes of the electron gun assembly and between the electrodes and the inner wall of the neck tube. A knocking (high-pressure stabilization) treatment for preventing the generation of sparks in the tube during use of the completed color cathode ray tube by removing protrusions of the electrode parts and foreign matter in the tube.

FIG. 9 is a connection diagram showing an example of electrode connection at the time of knocking. The electrodes preceding the fifth grid electrode group 3 are collectively brought to the ground potential as shown by the dotted line, and the sixth electrode which is the anode electrode. The aforementioned high knocking voltage is applied to the grid electrode 1.

However, in a color cathode ray tube manufactured through a regular manufacturing process including such a knocking process,
As shown in FIG. 10, dentite (resin-like product) 21 is generated in the resistor pattern 19 of the built-in resistor 12, which causes an electric short circuit in the built-in resistor 12.

Here, FIG. 10 is an enlarged plan view showing a part of the built-in resistor 12, and the same symbols are given to the same parts as those in each of the above-described figures. In FIG. 10, S indicates the minimum distance between the resistor pattern 19 and the terminal 14.

The mechanism of the generation of the dentite 21 is generally considered as follows.

That is, as described above, lead borosilicate (borosilicate) glass is used for the insulating film layer 20a covering the resistor pattern 19 of the built-in resistor 12, and sodium (Na) is contained in the insulating film layer 20a. Is present, the Na ion moves and concentrates on the resistor pattern side having a relatively negative potential due to the above-described knocking step and the electric field generated by the application of the high voltage during operation.

The concentrated Na ions reduce lead oxide (PbO) in the vicinity which is contained and coexisting as a glass composition and precipitates metallic lead (Pb).

Since metallic lead has electrical conductivity, the metallic lead crystal grows from a negative potential to a positive potential, thereby causing a short circuit between the resistor patterns or the terminals.

Under such a mechanism, when a short circuit occurs between the resistor patterns or between the terminals, a voltage is applied from the terminal 13 to the intermediate grid electrode 2 connected to the terminal 14 via the resistor pattern 19 as described later. Voltage fluctuates, and the focus characteristic deteriorates.

That is, as described above, the voltage applied to the intermediate grid electrode 2 is determined by the ratio between the overall resistance value of the resistor pattern 19 of the internal resistor 12 and the resistance value between the terminals 13 and 14. Although a predetermined voltage obtained by dividing the anode voltage is supplied, a change in the overall resistance value of the resistor pattern 19 and a change in the ratio of the resistance values change, and the divided voltage also changes to change the intermediate grid electrode 2. However, there is a problem in that the voltage applied to the electrodes changes, and the focus characteristics deteriorate.

Further, as a result of the Na ions moving to the vicinity of the negative potential resistor pattern, the concentration of Na in this portion is relatively increased, the thermal expansion coefficient in this portion is increased, and cracks are formed in the insulating coating layer 20a. Then, there was a problem that the cracked glass shards scattered into the tube.

The scattered glass shards partially block the electron beam passage holes of the shadow mask and cause clogging failures, thereby hindering high definition of the image. The portion is sandwiched between the electrodes of the electron gun and has a problem of deteriorating the withstand voltage characteristics of the electron gun, and has various problems caused by scattering of the glass forming the insulating film layer.

One of the objects of the present invention is to solve the above-mentioned problems of the prior art, and to provide a color cathode ray having an electron gun having a built-in resistor having high definition image display and excellent withstand voltage characteristics. To provide tubes.

[0036]

In order to achieve the above-mentioned object, the present invention provides at least a plurality of grid electrodes for generating, accelerating and focusing an electron beam, an insulating support rod for fixing each grid electrode, In the color cathode ray tube having an electron gun having an internal resistor, the first insulating film layer covering the resistor pattern of the internal resistor is made of a lead borosilicate glass containing 20% by weight or more of lead oxide. Configure and
The content of sodium (Na) was set to 10 to 300 ppm.

Typical configurations of the present invention are as follows. That is, (1) an electron beam generating unit, a focusing accelerator for focusing and accelerating the electron beam toward the phosphor screen, and a part of each of the plurality of electrodes constituting the electron beam generating unit and the focusing accelerating unit. And a resistor pattern formed on the surface of the insulating plate and connected to any one of the plurality of electrodes, and a first insulating film layer covering the resistor pattern. A color cathode ray tube provided with an electron gun having a built-in resistor.
Is made of glass containing 20% by weight or more of lead oxide (PbO) and 10 to 300 ppm of sodium. (2) In (1), the sodium is 50 to 2
It is characterized by being 00 ppm. (3) In the above (1), the sodium is 100 p
pm. (4) In the above (1) to (3), the glass is
It is characterized by being a lead borosilicate glass. (5) In the above (1) to (4), the resistor pattern is mainly composed of ruthenium dioxide and lead oxide. (6) In the above (4), the lead borosilicate glass may be:
It contains 60% by weight of lead oxide, 28% by weight of silicon oxide, 8% by weight of boron oxide, 4% by weight of aluminum oxide, and about 100 ppm of Na. (7) In the above (1) to (6), the thickness of the first insulating film layer of the built-in resistor is T1 (mm), and the content of sodium per unit volume is M (ppm / mm ³ ). Then, T1 and M are set within a range defined by 0.01 ≦ T1 × M ≦ 1.5. (8) An electron beam generator, a focusing accelerator for focusing and accelerating the electron beam toward the phosphor screen, and a part of each of the plurality of electrodes constituting the electron beam generator and the focusing accelerator are arranged in a predetermined order. An insulating support rod buried and fixed at an interval, a resistor pattern formed on the surface of the insulating plate and connected to any of the plurality of electrodes, a first insulating film layer covering the resistor pattern, and the insulating plate And a built-in resistor having a second insulating film layer formed on the back surface of the color cathode ray tube having an electron gun, wherein the first insulating film layer of the built-in resistor has 20% by weight. The above lead oxide (PbO) and 1
It is made of glass containing 0 to 300 ppm of sodium. (9) In (8), the sodium is 50 to 2
It is characterized by being 00 ppm. (10) In (8), the sodium is 100
ppm. (11) In the above (8) to (10), the glass is a lead borosilicate glass. (12) In the above (8) to (11), the resistor pattern is mainly composed of ruthenium dioxide and lead oxide. (13) In the above (11), the lead borosilicate glass contains 60% by weight of lead oxide, 28% by weight of silicon oxide, 8% by weight of boron oxide, 4% by weight of aluminum oxide, and Na:
It is characterized by containing about 100 ppm. (14) In the above (8) to (13), the first insulating film layer and the second insulating film layer are made of the same material. (15) In the above (8) to (14), the thickness of the second insulating film layer is larger than the thickness of the first insulating film layer. (16) In the above (8) to (15), the thickness of the first insulating film layer of the built-in resistor is T1 (mm), and the content of sodium per unit volume is M (ppm / mm3).
Where T1 and M are set within a range defined by 0.01 ≦ T1 × M ≦ 1.5.

It should be noted that the present invention is not limited to the above configuration, and various modifications can be made without departing from the technical idea of the present invention, and a color cathode ray provided with an electron gun for emitting a plurality of electron beams. The present invention can be similarly applied to not only a tube but also various kinds of cathode ray tubes which emit a single electron beam, for example, a projection type cathode ray tube, and other types of cathode ray tubes having an electron gun having a built-in resistor.

[0039]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1A and 1B are a plan view and a rear view of a built-in resistor incorporated in an electron gun for explaining an embodiment of a color cathode ray tube according to the present invention, and FIG. FIG. 9 is a schematic diagram for explaining a cross-sectional structure of a main part viewed from the BB direction, in which the same parts as those in FIG.

1 (a), 1 (b) and 2, the internal resistor 22 before being attached to the electron gun has a predetermined pattern formed on the insulating plate 18 in the same manner as the conventional internal resistor described with reference to FIG. A resistor layer (resistor pattern) 19 formed at one end, a terminal 13 connected to the high-voltage electrode at one end, a terminal 14 connected to the intermediate electrode, and a terminal 15 connected to the ground are fixed and protruded by caulking or the like. I have. Further, a first insulating film layer 23a having a composition described later is formed so as to cover the resistor layer 19, and a second insulating film layer 23b is formed on the back surface (back surface) side of the insulating plate 18 at T1 and T2, respectively. It is formed with a film thickness.

That is, the first insulating film layer 23a
Is 20% by weight or more of lead oxide (PbO) and 10 ppm
It is made of lead borosilicate (borosilicate) glass containing 300 ppm of sodium (Na).

In this embodiment, the second insulating film layer 23
b is also made of the same material as the first insulating film layer 23a.

Here, the amount of sodium was measured by using a time-of-flight mass spectrometer and measuring the surface layer thickness of 2 mm with gallium (Ga) ions.
The degree is determined by the Na / pb ratio when analyzed at an acceleration voltage of 15 kV.

The other configuration is the same as that described in the above-mentioned prior art, so that the repeated description will be omitted.

Next, an example of a method for manufacturing the built-in resistor 22 will be described.

First, thickness T: 0.635 mm, width: 5 m
m, length L1: 58 mm alumina substrate (purity: 96%
Above), the surface of the insulating plate 18 having the terminals 13 to 15 previously formed of substantially the same material as a resistor pattern forming material to be described later is coated with a material mainly composed of ruthenium oxide. A resistor pattern to be the resistor pattern 19 is formed by screen printing. Next, after drying, firing is performed at 850 ° C. to form a resistor pattern 19.
Subsequently, a lead borosilicate (borosilicate) glass paste of the following composition example (1) is coated on the surface so as to cover the resistor pattern 19 so that the film thickness after firing is 0.15 mm. Is applied to a predetermined thickness except for a part of. Also, the insulating substrate 18
On the back surface, a lead borosilicate glass paste having the same composition as described above is applied to a predetermined thickness except for a part of the end so that the film thickness after firing becomes 0.25 mm. The application area on the front side is about 250 mm ² .

Composition example of lead borosilicate (borosilicate) glass (1), lead oxide: 60% by weight, silicon oxide: 28% by weight,
Boron oxide: 8% by weight, aluminum oxide: 4% by weight, N
a: about 100 ppm.

After coating and drying, at 600 ° C., 40
Bake for 1 minute, T1: 0.15mm, T2: 0.25mm
The first and second insulating film layers 23a and 23b were respectively formed, and the built-in resistor 22 was manufactured.

Each dimension is L1: 58 mm, L2: 40 m
m, L3: 14 mm, L4: 2 mm, L5: 2 mm, L
6: 3.5 mm and L7: 3.5 mm.

In the built-in resistor manufactured in this manner, since the content of sodium is controlled to about 100 ppm, the generation of dentite is suppressed, and various problems associated with the deposition of lead metal can be solved. By using lead borosilicate glass containing 20% by weight or more of lead oxide, warpage and bending of the built-in resistor can be prevented.

In this example, the thickness of the first insulating film layer 23a on the front surface side is made smaller than the film thickness of the second insulating film layer 23b on the rear surface side, thereby preventing the warping and bending described above. In addition, there is a feature that generation of a spark can be reduced and a withstand voltage can be improved.

Here, as another example of the lead borosilicate (borosilicate) glass used in the present invention, there are the following composition examples.

Composition example of lead borosilicate (borosilicate) glass (2), lead oxide: 55% by weight, silicon oxide: 29% by weight,
Boron oxide: 8% by weight, aluminum oxide: 4% by weight, others: balance, Na: about 100 ppm.

FIG. 3 is a graph showing the relationship between the amount of sodium (Na) in the first insulating film layer covering the resistor pattern and the life of the color cathode ray tube.

The test color cathode ray tube shown in FIG. 3 has the built-in resistor shown in FIG. 1 mounted thereon.
Is 1.2 mm (the minimum distance between the resistor patterns or between the terminals), while the sodium content is 5 mm.
0 ppm, 100 ppm each between 100 ppm and 500 ppm
pm intervals were used. As shown in "JIS R3502" (alkaline dissolution test), a method using hot water washing was used for controlling the sodium content.

The test conditions were as follows. The color cathode ray tube for the test was set in a constant temperature bath at room temperature of 40 ° C., and the anode (operating) voltage was:
27 kV (electric field intensity: 1.38 kV / mm), built-in resistor temperature: 150 ° C, short circuit (short) between resistor patterns or terminals by dent light, focus of color cathode ray tube This is the time until the characteristics deteriorate.

As is apparent from FIG. 3, when the sodium (Na) content exceeds 300 ppm, the target life time of 25,000 hours (25 k hours) generally recognized in the art.
There is a risk of the occurrence of a case where h) cannot be secured, and the upper limit must be a value not exceeding 300 ppm. On the other hand, if the sodium content is reduced, the life can be prolonged. However, from the labor and cost for sodium reduction, and the economic effect of the obtained life time, the lower limit is preferably set to 10 ppm. Sodium content is 10ppm ~
300 ppm is required.

Further, when the amount of sodium is 50 ppm to 200 ppm,
At 100 ppm, the life extension was large, and particularly at 100 ppm, the life extension was remarkable.

Next, FIG. 4 is a view showing the relationship between the thickness of the first insulating film layer and the allowable sodium content per unit volume.

The growth of the dentrite of the built-in resistor is as follows.
The total amount affects the local concentration of sodium in the insulating coating layer. That is, if the surface area on the resistor pattern side is constant, the allowable sodium amount changes depending on the film thickness.

When the amount of sodium is 10 ppm to 300 ppm
In the present invention, the allowable range of the amount of sodium per unit volume with respect to the film thickness is from the maximum value indicated by the curve C in FIG. 4 to a range Z indicated by oblique lines.
m), the sodium content per unit volume is M (ppm)
/ Mm ³ ), the range satisfies 0.01 ≦ T1 × M ≦ 1.5.

Here, a point P in FIG. 4 shows an example of the built-in resistor 22 of the present invention formed by the above-described manufacturing method.

FIG. 5 is a schematic sectional view for explaining an example of the overall configuration of an embodiment of a color cathode ray tube according to the present invention. 4
1 is a panel portion, 42 is a phosphor screen, 32 is a neck portion for accommodating an electron gun, 43 is a funnel portion connecting the panel portion and the neck portion, 44 is a shadow mask, 46 is a mask frame, 47 is a magnetic shield, 48 is a mask suspension mechanism, 49 is an in-line type electron gun, 50 is a deflection yoke,
51 is an external correction magnetic device, 10a is an internal conductive film, 52 is an explosion-proof band, 53 is a panel pin, 54 is a mask assembly,
45 is a stem pin.

In this color cathode ray tube, the panel section 41, the neck section 32 and the funnel section 43 constitute a vacuum envelope 55, and an electron beam (a center beam and an electron beam) emitted from an electron gun 49 housed in the neck section 32. The two side beams B scan the phosphor screen 42 two-dimensionally by the horizontal and vertical deflection magnetic fields formed by the deflection yoke 50.

The electron beam is intensity-modulated by a modulation signal such as a video signal supplied from a stem pin 45 and further controlled by an intermediate grid electrode to which a voltage divided by a built-in resistor is applied. The color is selected by the shadow mask 44 installed immediately before the above, and collides with each phosphor (red, green, blue) constituting the phosphor screen 42 to reproduce a predetermined color image.

The in-line type electron gun 49 is an electron gun provided with a built-in resistor having the structure described in the above embodiment.

It should be noted that the present invention is not limited to the above configuration, and various changes can be made without departing from the technical idea of the present invention.

[0069]

As described above, according to the present invention,
By specifying the composition of the first insulating film layer covering the resistor pattern of the built-in resistor, deposition of metal lead (dentite) is suppressed, and the connection between the resistor patterns or between the terminals is suppressed. Since the short circuit can be prevented, the divided voltage does not fluctuate, and since the sodium ions do not move to the negative potential portion, the thermal expansion coefficient of the negative potential portion does not increase, so that the insulating film layer is not formed. There is no crack, and thus no broken glass fragments are scattered in the tube. This solves the problem of the clogging of the electron beam passage hole of the shadow mask and the deterioration of the withstand voltage characteristic of the electron gun. ,
A cathode ray tube provided with an electron gun having a built-in resistor having a high definition image display and excellent withstand voltage characteristics can be provided.

[Brief description of the drawings]

FIG. 1 shows a built-in resistor incorporated in an electron gun for explaining an embodiment of a color cathode ray tube according to the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b) is a rear view.

FIG. 2 is a schematic diagram illustrating a cross-sectional structure of a main part viewed from a direction BB in FIG.

FIG. 3 is a diagram showing the relationship between the life characteristics and the sodium content of the color cathode ray tube of the present invention.

FIG. 4 is a diagram showing the relationship between the film thickness of an insulating film layer and the sodium content of a built-in resistor of a color cathode ray tube according to the present invention.

FIG. 5 is a schematic cross-sectional view illustrating an example of the overall configuration of a color cathode ray tube according to an embodiment of the present invention.

FIG. 6 is a side view of a main part of a conventional color cathode ray tube containing an electron gun having a built-in resistor.

FIG. 7 is a side view of a main part viewed from the direction of arrow A in FIG. 6;

FIG. 8 is a view for explaining a built-in resistor built in the electron gun.
8A is a plan view, FIG. 8B is a side view, and FIG.
Is a rear view.

FIG. 9 is a connection diagram showing an example of electrode connection at the time of knocking.

FIG. 10 is an enlarged plan view showing a part of a built-in resistor for explaining a dent light of the built-in resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anode 2 Intermediate grit electrode 9 Insulating support rod 12, 22 Built-in resistor 13, 14, 15 Terminal 18 Insulating substrate 19 Resistor layer (resistor pattern) 20a, 23a First insulating film layer 20b, 23b Second Insulating film layer 21 Dentrite (dendritic product) 49 Electron gun.

Claims (16)

[Claims] An electron beam generator, a focusing accelerator for focusing and accelerating an electron beam toward a phosphor screen, and a part of each of a plurality of electrodes constituting the electron beam generator and the focusing accelerator are provided. And a resistor pattern formed on the surface of the insulating plate and connected to any one of the plurality of electrodes, and a first insulating film layer covering the resistor pattern. A color cathode ray tube provided with an electron gun having a built-in resistor, wherein the first insulating film layer of the built-in resistor contains 20% by weight or more of lead oxide (PbO) and 10 to 300 ppm of sodium. A color cathode ray tube comprising glass. 2. The color cathode ray tube according to claim 1, wherein said sodium is 50 to 200 ppm. 3. The color cathode ray tube according to claim 1, wherein said sodium is 100 ppm. 4. A color cathode ray tube according to claim 1, wherein said glass is a lead borosilicate glass. 5. The color cathode ray tube according to claim 1, wherein said resistor pattern mainly comprises ruthenium dioxide and lead oxide. 6. The lead borosilicate glass contains 60% by weight of lead oxide, 28% by weight of silicon oxide, 8% by weight of boron oxide, 4% by weight of aluminum oxide and about 100 ppm of Na. The color cathode ray tube according to claim 4, wherein 7. When the thickness of the first insulating film layer of the built-in resistor is T1 (mm) and the content of sodium per unit volume is M (ppm / mm ³ ), 0.01 ≦ T1 7. The color cathode ray tube according to claim 1, wherein T1 and M are set within a range defined by xM≤1.5. 8. An electron beam generator, a focusing accelerator for focusing and accelerating the electron beam toward the phosphor screen, and a part of each of a plurality of electrodes constituting the electron beam generator and the focusing accelerator are provided. An insulating support rod buried and fixed in the order and interval, a resistor pattern formed on the surface of the insulating plate and connected to any of the plurality of electrodes, and a first insulating film layer covering the resistor pattern; A color cathode ray tube having an electron gun having a built-in resistor having a second insulating film layer formed on the back surface of an insulating plate, wherein the first insulating film layer of the built-in resistor has a thickness of 20 mm. A color cathode ray tube comprising a glass containing lead oxide (PbO) in an amount of not less than 10% by weight and sodium in an amount of 10 to 300 ppm. 9. The color cathode ray tube according to claim 8, wherein said sodium is 50 to 200 ppm. 10. A color cathode ray tube according to claim 8, wherein said sodium is 100 ppm. 11. A color cathode ray tube according to claim 8, wherein said glass is a lead borosilicate glass. 12. A color cathode ray tube according to claim 8, wherein said resistor pattern mainly comprises ruthenium dioxide and lead oxide. 13. The lead borosilicate glass contains 60% by weight of lead oxide, 28% by weight of silicon oxide, 8% by weight of boron oxide, 4% by weight of aluminum oxide and about 100 ppm of Na. The color cathode ray tube according to claim 11, wherein 14. A color cathode ray tube according to claim 8, wherein said first insulating film layer and said second insulating film layer are made of the same material. 15. The semiconductor device according to claim 8, wherein said second insulating film layer has a thickness greater than that of said first insulating film layer.
A color cathode ray tube according to claim 14. 16. When the thickness of the first insulating film layer of the built-in resistor is T1 (mm) and the content of sodium per unit volume is M (ppm / mm ³ ), 0.01 ≦ T1. 16. The color cathode ray tube according to claim 8, wherein T1 and M are set within a range defined by xM≤1.5.