JP2001185051A - Division resistor to be mounted within cathode ray tube and cathode ray tube having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cathode ray tube having good focus performance by division resistor, of which resistance value can be stabilized with simple construction, to be mounted within the cathode ray tube. SOLUTION: A resistor layer 21 of division resistor 19, which is to be mounted within the cathode ray tube, has long portions 24 extending in a direction of a length of an insulation substrate 20 in extended position at a time when potential difference of the resistor layer 21 and an electrode of an electron gun 4 is knocking processed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube used for a television set, a computer display, and the like, and to a cathode ray tube built-in resistor for supplying a predetermined voltage to electrodes in the tube.

[0002]

2. Description of the Related Art In a cathode ray tube, a built-in resistor is provided near an electron gun in order to obtain a high voltage to be supplied to a convergence electrode and a focus electrode. For example, as shown in FIG. Electrode take-out parts 22a-2
2d and a resistor layer 21 connected thereto and arranged in a zigzag shape are formed on the insulating substrate 20, and an insulating coating layer 23 is formed on the resistor layer 21 (here, the region is indicated by hatching for easy understanding). ) Is generally used. In such a built-in resistor,
Japanese Patent Application Laid-Open No. Sho 60-107242 discloses a technique in which the thickness of the insulating coating layer is larger at the portion where the potential difference between the surface potential of the insulating coating layer and the potential of the resistor layer is larger than at other portions. It has been disclosed.

According to such a technique, since the proof stress of the insulating coating layer can be partially increased, sparks between the electrodes of the electron gun are preliminarily produced in the manufacturing process for the purpose of stabilizing the completed electron gun. During the "knocking process"
In particular, even in a place where a large potential difference is applied, the insulating coating layer is hardly damaged. Therefore, a change in the resistance division ratio before and after the knocking process can be suppressed, and a cathode ray tube having stable focus performance can be obtained.

[0004]

However, in the prior art, it is necessary to partially manage the thickness of the insulating coating layer in order to partially increase the thickness of the insulating coating layer, and the structure becomes complicated. there were.

[0005] Even when the insulating coating layer is partially thickened, the insulating coating layer tends to be thinner on the long side of the insulating substrate than on the center when viewed in a section perpendicular to the long axis of the insulating substrate. . For this reason, especially in a place where the potential difference between the resistor layer and the electrode of the electron gun is large, when sparking is performed by the knocking process, the insulating coating layer is damaged, and the resistance value (division ratio) changes. There is also a problem that a cathode ray tube having a high focus performance cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cathode-ray tube having excellent focus performance by forming a cathode-ray tube built-in split resistor having a more stable resistance value with a simple configuration. The purpose is.

[0007]

In order to solve the above-mentioned problems, a cathode-ray tube built-in split resistor according to the present invention is provided with a cathode-ray tube built-in splitter for dividing an applied voltage and supplying the divided voltage to a predetermined electrode of an electron gun. The resistor has a configuration in which a resistor layer, an electrode extraction portion, and an insulating coating layer are provided on an insulating substrate, and where a potential difference between the resistor layer and the electrode of the electron gun becomes large during a knocking process, The resistor layer has a long line extending in a longitudinal direction of the insulating substrate.

In this manner, the insulating coating layer is less likely to be destroyed at a location where the potential difference between the resistor layer and the electrode of the electron gun is large.

Further, in the cathode-ray tube built-in split resistor according to the present invention, the long line portion is a straight line substantially parallel to a longitudinal direction of the insulating substrate.

[0010] By doing so, the formation of the long wire portion becomes easy.

Furthermore, in the cathode-ray tube built-in split resistor according to the present invention, the resistor layer has a folded portion connected to the long wire portion and for folding the long wire portion in a longitudinal direction of the insulating substrate. .

By doing so, the destruction of the insulating coating layer can be prevented, and the resistor layer can be formed long.

Further, in the cathode-ray tube built-in split resistor according to the present invention, the resistor layer has a trimming portion for adjusting a resistance value near the folded portion.

By doing so, the trimming can be made longer.

Further, in the cathode ray tube according to the present invention, the splitter with the built-in cathode ray tube is provided on the multi-glass of the electron gun such that a longitudinal direction thereof is along a tube axis direction of the cathode ray tube. The acceleration voltage is divided and a divided potential is supplied to a predetermined electrode of the electron gun.

In this manner, a cathode ray tube having a stable resistance division ratio can be obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) As shown in FIG. 2, a cathode ray tube according to the present invention comprises a panel 1 and a funnel 2 to form an envelope. Is formed with a phosphor screen 3 on which phosphors emitting blue, green and red light are applied. An electron gun 4 is provided in the neck portion 5 of the funnel, and electron beams 6 corresponding to the phosphors of the respective colors are emitted from the electron gun 4 and reach the phosphor screen 3 through the apertures of the shadow mask 7. I do.

Here, as an example, the electron gun 4 has a structure for forming a quadrupole lens and a main lens electric field, and FIG.
As shown in the figure, three cathodes 8, a control electrode 9, and an acceleration electrode 1
0, the first focusing electrode 11, the first auxiliary electrode 12, the second auxiliary electrode 13, the second focusing electrode 14, the intermediate electrode 15, the final accelerating electrode 16, the shield cup 17, and the respective electrodes are spaced apart from each other by a predetermined distance. It is composed of a pair of multi-glasses 18 to be held (only one is shown in the figure). On the upper surface of one of the multi-glasses, a split resistor 19 with a built-in cathode ray tube is installed.

Next, a cathode-ray tube built-in split resistor that best illustrates the characteristics of the present invention will be described in detail with reference to FIG. FIG. 1A is a view of the splitter with a built-in cathode ray tube seen from above, and FIG. 1B is a view to show the positional relationship between the splitter with a built-in cathode ray tube and each electrode of an electron gun. It is the figure which looked at the electron gun from the side.

The cathode ray tube built-in split resistor 19 according to the present invention.
A resistor layer 21 and electrode extraction portions 22a to 22d on an electrically insulating substrate 20, and an insulating coating layer 23 covering the insulating substrate from above the resistor layer 21 (here, the regions are shaded for easy understanding). ) Are formed. The resistor layer 21 has a linear long line portion 24 substantially parallel to the longitudinal direction of the insulating substrate 20 near one electrode extraction portion 22b for supplying a divided potential. The layer 21 has a folded portion 25 that folds the linear portion in the opposite direction. Here, the long wire portion 24 is formed so as to correspond to the position of at least one electrode (corresponding to the second focusing electrode 14 in FIG. 1B) of the electron gun at which the potential difference with the resistor layer increases during the knocking process. ing. further,
The resistor layer 21 has a trimming portion 26. The trimming portion 26 is partially shaved with an abrasive such as alumina powder (sand blast method) to change the resistance division ratio, and This is to correct the variation of the resistance division ratio due to an error or the like at the time of forming the resistance 21 to make the resistance division ratio a predetermined value.

In the present embodiment, as an example, the insulating substrate 20 has a size of 62 mm long × 6 mm wide × 0.6 mm thick. The resistor layer 21 has a width of 0.4 mm and a thickness of about 15 μm.
m, it is arranged at a position 0.8 mm inward from the long side 29 of the insulating substrate, and one cycle of the zigzag mountain is 1.8 to
2.0 mm, the length of the long line portion was 4 mm or more, and the width of the trimming portion 26 was 1.6 mm. The electrode extraction portions 22a to 22d have an area of about 6 to 7 mm ² and are connected to the corresponding electrodes of the electron gun via the terminals 27a to 27d. The thickness of the insulating coating layer 23 is 250 μ
m.

The insulating substrate 20 is made of 96% by weight alumina ceramic, and the resistor layer 21 is formed by screen printing using a thick film resistor material containing lead ruthenate. Electrode extraction portions 22a to 22d and resistor layer 21
Preferably, a conductive particle such as lead ruthenate having a pyrochlore-type crystal structure, a non-conductive glass particle composed of lead oxide, silicon oxide or the like, and a temperature coefficient of resistance (TCR) regulator containing oxides of titanium and manganese are included. Is used. Also, the insulating coating layer 2 covering the resistor layer 21
3 is preferably made of a non-conductive glass containing lead oxide, silicon oxide and the like.

Further, in this embodiment, as one example, the total resistance of the cathode-ray tube built-in split resistor is set to 1800 MΩ.
And The sheet resistance value of the resistor layer 21 is 4 to 5 MΩ /
On the other hand, the sheet resistance value of the electrode extraction portions 22a to 22d was set to 1 to 100 kΩ / □ by making the lead ruthenate / glass component ratio larger than that of the resistor layer 21.

The function and effect of the cathode ray tube built-in split resistor constructed as described above will be described below.

In general, if the electrode of the electron gun of the cathode ray tube has a sharp projection or the like, an undesired discharge occurs when the cathode ray tube is actually used, which causes a variation in the focusing performance of the electron gun and a circuit breakage. I will. For this reason, usually, in the manufacturing process of the cathode ray tube, by applying a high voltage that is two to three times higher than the final accelerating voltage at the time of normal use of the cathode ray tube to the electrode to cause a discharge in advance, the sharp projection portion is formed. It has been practiced to forcibly cause a spark to melt and shape the spark to stabilize the cathode ray tube when it is used (this is called "knocking treatment").

For example, in the case of the electron gun shown in this embodiment, a high-frequency pulse of about 80 kV is applied to the final accelerating electrode 16, and the control electrode 9, the accelerating electrode 10, the first auxiliary electrode 1
2, the second focusing electrode 14 is grounded to the ground,
7d is electrically opened to perform a knocking process.

In the knocking process, when the connection terminal 27d of the resistor ground is opened, no current flows through the resistor layer 21, so that the resistor layer 21 and the electrode extraction portions 22a to 22
A pulse voltage of about 80 kV is applied to d, the terminals 27b and 27c and the intermediate electrode 15, the second auxiliary electrode 13, and the first focusing electrode 11 electrically connected thereto. By doing so, a spark is generated between the divided resistor with a built-in cathode ray tube and the electron gun, between the divided resistor with a built-in cathode ray tube and the neck, and the like.

Here, when a spark occurs between the electrode extraction portion 22b not covered with the insulating coating layer 23 and the second focusing electrode 14, a potential difference is generated between the electrode extraction portions 22a and 22b. Then, a spark current flows through the resistor layer 21 from the electrode extraction portions 22a to 22b.

When a current flows through the resistor layer due to such a large potential difference, a large potential difference is instantaneously generated between the zigzag folded portions in the resistor layer formed by zigzag folding. In some cases, electrons originally transported along the resistor layer fly from the zigzag folded portion to the adjacent zigzag folded portion (for example, from 28a to 28b) and flow. Such a phenomenon tends to occur particularly at a large potential difference between the resistor layer and the electrode.
The reason is as follows.

At a place where the potential difference between the electrode of the electron gun and the resistor layer is large, the temperature of the resistor pattern instantaneously rises during spark discharge in knocking processing, and gas or vapor is locally released. In such a case, the interface between the insulating substrate and the insulating film becomes unstable, and the dielectric strength decreases, which causes electrons to fly between the resistor layers. Further, it is also likely to occur when the resistor layer is formed such that the zigzag folded portion is located near the long side 29 of the insulating substrate 20 where the thickness of the insulating coating layer tends to be thin.

When the phenomenon in which electrons fly between the resistor layers occurs as described above, the insulating coating layer is destroyed in the vicinity thereof,
As a result, the resistance division ratio changes and cannot be maintained at an appropriate value, and stable focus performance cannot be obtained.

On the other hand, according to the present embodiment, the portion where the potential difference between the electrode and the resistor layer becomes large (here,
In the vicinity of the second focusing electrode 14), the shape of the resistor layer 21 is changed to a linear long line portion 2 substantially parallel to the longitudinal direction of the insulating substrate 20.
By setting the value to 4, it is possible to prevent the insulating coating layer 23 from being broken at this point due to the electrons flying. Further, by folding back the long wire portion 24 at a position away from the long side 29 of the insulating substrate, while preventing scattering of electrons, a sufficient resistance value as the long resistor layer 21 using a large surface area of the insulating substrate 20 can be obtained. Can be secured. Further, by making the long line portion straight, formation of the long line portion becomes easy.

In the present embodiment, the electrode take-out section 22
A part of the resistor layer between a and 22b is provided as a folded portion 25 behind the electrode take-out portion 22b, that is, toward the electrode take-out portion 22c rather than the electrode take-out portion 22b. The electrode take-out part 22b is arranged and the terminal 27
b can be as short as possible.

As described above, according to the present invention, since the breakdown of the insulating coating layer of the cathode-ray tube built-in split resistor can be suppressed, a cathode ray tube having stable focus performance without a change in the resistance split ratio can be obtained. In addition, it is possible to simplify the connection of the terminals by arranging the electrode extraction portions closer to the corresponding electrodes.

In this embodiment, the long line portion of the resistor layer is shown as a straight line substantially parallel to the longitudinal direction of the insulating substrate. However, the present invention is not limited to this. For example, the long line portion of the resistor layer may be used. However, even when the insulating substrate has a diagonal direction or a gentle curved shape, the effect of the present invention described above as a long line portion can be obtained.

In this embodiment, the portion where the potential difference between the electrode of the electron gun and the resistor layer is large is close to the high voltage electrode extraction portion 22b in FIG. Has shown an example in which a long line portion is provided in the resistor layer, but the first auxiliary electrode 1 having the same potential as the second focusing electrode 14 is provided.
It is needless to say that the same effect can be obtained by providing a long line portion also in the vicinity of 2.

Further, in this embodiment, an example is shown in which the resistor layer is formed on the side opposite to the electron gun of the cathode-ray tube built-in split resistor, but the resistor layer is formed on the electron gun side. It doesn't matter.

(Second Embodiment) Next, a second embodiment of the present invention will be described.

The cathode ray tube built-in split resistor of the cathode ray tube according to this embodiment has substantially the same structure as that of the first embodiment, but as shown in FIG. In that a trimming margin 26a is provided. As an example, the trimming margin 26a has a width of 1.6 m.
m, and a semi-elliptical shape having a length of 4.5 mm.

According to the present embodiment, the trimming margin 26a is provided in the bent portion 25 of the long wire portion 24, so that the trimming margin can be made longer.
The range in which the variation in the resistance division ratio is corrected can be increased, and the adjustment range can be widened. Further, by increasing the trimming margin in this manner, the voltage load per unit length of the resistor layer can be reduced, so that the withstand voltage load limit of the resistor layer is not exceeded. No defect occurs due to the change in the material properties of the above.

Therefore, in addition to the easy adjustment of the resistance division ratio, it is possible to obtain a highly reliable divided resistor with a built-in cathode ray tube in which the material properties of the resistor layer are stable.

[0042]

As described above, according to the present invention, it is possible to easily obtain a cathode-ray tube built-in split resistor having a stable split resistance ratio by preventing the insulation coating layer from being broken with a simple structure. Thus, a cathode ray tube having stable focus performance can be provided.

[Brief description of the drawings]

FIG. 1 is a view showing a cathode-ray tube built-in split resistor according to a first embodiment of the present invention;

FIG. 2 is a diagram showing a cathode ray tube of the present invention.

FIG. 3 is a diagram showing an example of an electron gun for a cathode ray tube according to the present invention.

FIG. 4 is a diagram showing a cathode-ray tube built-in split resistor according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a conventional split resistor with a built-in cathode ray tube.

[Explanation of symbols]

 Reference Signs List 4 Electron gun 19 Cathode ray tube built-in split resistor 20 Insulating substrate 21 Resistor layer 22a to 22d Electrode extraction part 23 Insulating coating layer 24 Long wire part

Claims (5)

[Claims] 1. A cathode-ray tube built-in divided resistor for dividing an applied voltage and supplying the divided voltage to a predetermined electrode of an electron gun has a configuration in which a resistor layer, an electrode extraction portion, and an insulating coating layer are provided on an insulating substrate. Wherein, at a position where a potential difference between the resistor layer and the electrode of the electron gun becomes large during knocking processing, the resistor layer has a long line portion extending in a longitudinal direction of the insulating substrate. A split resistor with a built-in cathode ray tube. 2. The split resistor with a built-in cathode ray tube according to claim 1, wherein said long wire portion is a straight line substantially parallel to a longitudinal direction of said insulating substrate. 3. The device according to claim 1, wherein the resistor layer has a folded portion connected to the long wire portion to fold the long wire portion in a longitudinal direction of the insulating substrate. Split resistor with built-in cathode ray tube. 4. A split resistor with a built-in cathode ray tube according to claim 3, wherein said resistor layer has a trimming portion for adjusting a resistance value near said turn-back portion. 5. A split resistor having a built-in cathode ray tube, which is provided on a multi-glass of the electron gun such that a longitudinal direction thereof is along a tube axis direction of the cathode ray tube. A cathode ray tube provided with a cathode ray tube built-in split resistor according to any one of claims 1 to 4, wherein a divided potential is supplied to the predetermined electrode.