JP3178892B2 - Electron tube built-in element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron tube built-in element incorporated in an electron tube such as a color cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, in a color cathode ray tube used for an electron tube, for example, a color television receiver, a tube requiring a high voltage to be supplied to a convergence electrode, a focus electrode and the like in addition to an anode voltage. is there.

In such a case, if a high voltage is supplied from the stem of the color cathode-ray tube, a problem arises in terms of withstand voltage. A method has been proposed in which a resistor element is incorporated, whereby the anode voltage is divided to supply a high voltage to each electrode (for example,
Japanese Patent Application No. 1-237145, Japanese Patent Application No. 1-14303
No. 9).

FIG. 7 shows an example of a color cathode ray tube (in the vicinity of an electron gun) in which such a voltage dividing resistance element is incorporated.
In the figure, reference numeral 1 denotes a vacuum vessel, in which an electron gun assembly 2 is disposed in a neck portion 1a of the vacuum vessel 1, and the electron gun assembly 2 has three cathodes K in common. First grid electrode G1, second grid electrode G2, third grid electrode G3, fourth grid electrode G4, fifth grid electrode G
5, a sixth grid electrode G6, a seventh grid electrode G7, and an eighth grid electrode G8 are sequentially arranged coaxially, and a convergence electrode 3 is arranged downstream of the eighth grid electrode G8. Each grid electrode G1, G2, G3, G4
G5, G6, G7 and G8 are mechanically held by a bead glass 4 while maintaining a predetermined positional relationship with each other. Further, the third grid electrode G3 and the fifth grid electrode G
5 are electrically connected to each other by a conducting wire 5, and
The convergence electrode 3 is electrically connected to the eighth grid electrode G8 by welding.

A voltage-dividing resistance element 6 is attached to such an electron gun assembly 2, and high-voltage extraction electrodes 7a, 7b, 7c provided on the voltage-dividing resistance element 6 are connected to a seventh voltage-dividing electrode.
It is connected to the grid electrode G7, the sixth grid electrode G6, and the fifth grid electrode G5. Further, the extraction electrode 8 is connected to the convergence electrode 3 and the extraction electrode 9 on the earth side is connected to the earth electrode pin 10 embedded in the stem portion 1c.
It is connected to the.

On the other hand, a graphite conductive film 11 extending to the inner wall of the neck portion 1a is attached to the inner wall of the funnel portion 1b of the vacuum vessel 1, and a high voltage supply button (an anode button) provided on the funnel portion 1b is provided. The anode voltage is supplied through a not shown in the figure). The convergence electrode 3 is provided with a conductive spring 12. When the conductive spring 12 comes into contact with the graphite conductive film 11, the convergence electrode 3 is turned on.
The anode voltage is supplied to the eighth grid electrode G8 and the extraction electrode 9 of the voltage dividing resistance element 6, and the high voltage extraction electrodes 7a, 7
b, 7c is applied to the seventh grid electrode G7,
It is supplied to the sixth grid electrode G6 and the fifth grid electrode G5.

The voltage-dividing resistance element 6 built in such a color cathode ray tube is configured as shown in FIGS. 9 and 10, for example. That is, a resistance material made of a metal oxide containing ruthenium oxide having a predetermined resistance value and a lead borosilicate glass is printed on a ceramic insulating substrate 13 such as aluminum oxide in a zigzag pattern, dried, and dried. A fired electrode layer, for example, a resistance layer 14 is formed, and an insulating coating layer 15 is formed so as to cover the resistance layer 14. The resistance layer 14 is provided integrally with a voltage dividing end 16 made of the same material at a predetermined position. As is clear from FIG.
The through hole 17 penetrates through the voltage dividing end 16 and the insulating substrate 13.
A metal eyelet 18 for external connection is formed in the through hole 17.
Are fixed by caulking so as to be electrically connected to the end portion 16 for voltage division.

The eyelet 18 has a cylindrical portion 18a and a contact piece 18b.
As a method of fixing the eyelets 18,
As described above, a through hole 17 is formed in advance through the insulating substrate 13 and the end portion 16 for voltage division, and the cylindrical portion 18a is inserted into the through hole 17 and swaged. In this case, in order to obtain a stable electrical connection, a certain degree of strong eyelet fixing strength is required.

That is, the conventional swaging method of the eyelet 18 is configured as shown in FIGS. 11 (a) and 11 (b).
As shown in (a) of FIG.
a, and the insulating substrate 13 is further mounted so that the cylindrical portion 18a fits into the through hole 17. In this state, FIG.
Then, the cylindrical portion 18a is swaged from above with a punch (not shown), and the eyelets 18 are fixed to the insulating substrate 13.

[0010]

In general, the insulating substrate 13
Since it is brittle and easy to break, when trying to obtain a strong eyelet fixing strength, the x portion of the opening end of the through hole 17 in the insulating substrate 13 is broken as shown in FIG. 12, and fragments of the insulating substrate 13 are scattered. There are problems such as affecting the process, and the fact that fragments of the insulating substrate 13 fall off in the color cathode ray tube, which may cause clogging of the shadow mask holes. on the other hand,
If the swaging force is reduced so as not to cause chipping, there is a problem that the eyelet fixing strength becomes insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to prevent the occurrence of chips on an insulating substrate, improve the eyelet fixation strength, supply a stable divided voltage, and provide a shadow mask. An object of the present invention is to provide an electron tube built-in element in which poor clogging is reduced.

[0012]

According to the present invention, an electrode layer is formed on an insulating substrate, and a through hole is formed through a predetermined portion of the electrode layer and the insulating substrate. A metal eyelet is fixed by caulking so as to be electrically connected to the electrode layer, and a stepped chamfer is applied to the opening of the through hole insulating substrate, and the eyelet caulking is brought into close contact with the stepped chamfer. An electron tube built-in element.

[0013]

According to the present invention, the caulked meat of the eyelet is brought into close contact with the chamfered step, so that the chamfered step serves as an escape when caulking the eyelet, thereby preventing the generation of chips on the insulating substrate. At the same time, the caulked meat of the eyelet closely adheres to the stepped chamfer, so that the eyelet is hooked on the step portion, and the caulking strength is improved. In addition, a stable divided voltage can be supplied, and poor clogging of the shadow mask can be reduced.

[0014]

An embodiment of the present invention will be described below in detail with reference to the drawings.

The present invention is an improvement of the means for fixing the eyelets to the insulating substrate, and only the insulating substrate and the vicinity of the eyelets will be described. That is, the main part of the electron tube built-in element according to the present invention is configured as shown in FIGS. 1 (a), (b) and FIG. 2, and FIG. 2 is an enlarged view of a part of FIG.
The same parts as those in the conventional example are denoted by the same reference numerals,
Is an insulating substrate made of ceramic such as aluminum oxide. On the insulating substrate 13, an electrode layer, for example, a resistance layer 14 is formed at a predetermined position. The resistance layer 14 has a zigzag pattern designed to obtain a predetermined resistance division ratio, and a voltage dividing end 16 made of the same material is integrally provided at a predetermined location. Then, through the end portion 16 for voltage division and the insulating substrate 13, for example, the inner diameter is 1 mm.
In this through hole 17, a metal eyelet 18 for external connection is fixed by caulking so as to be electrically connected to the end portion 16 for voltage division.

In this case, a stepped chamfer 20 of 0.1 mm having a flat portion of, for example, 0.05 to 0.1 mm is applied to the opening of the through hole 17 on the side opposite to the end portion 16 for voltage division. As is apparent from FIG. 2, the caulked meat of the eyelet 18 is adhered to the stepped chamfer 20 in close contact. The eyelet 18 is composed of a cylindrical portion 18a and a contact piece 18b.
The outer diameter of the cylindrical portion 18a is, for example, 0.95 mm.

In fixing the eyelet 18, the cylindrical portion 1 of the eyelet 18 is placed on a caulking stand 19 as shown in FIG.
8a, and the insulating substrate 13 is further mounted so that the cylindrical portion 18a fits into the through hole 17. In this state, as shown in FIG. 1B, the cylindrical portion 18a of the eyelet 18 is caulked by a punch (not shown) from above, and the eyelet 18 is fixed to the insulating substrate 13. Then, as shown in FIG. 2, the caulked meat of the eyelet 18 closely adheres to the stepped chamfer 20, and the eyelet 18 is firmly fixed to the insulating substrate 13. Of course, this eyelet 18
The other side is firmly connected to the partial pressure end 16. Therefore, the eyelets 18 caulked to the step chamfer 20
Escapes, the concentration of force on the opening of the through-hole as in the prior art is eliminated, and chipping does not occur. Further, the eyelet 18 crimped into the stepped chamfer 20 has a shape such that the eyelet 18 is hooked on the stepped chamfer 20, which is effective for the eyelet fixing strength.

The eyelet fixation strength is measured by the method shown in FIG. That is, a torque indicated by an arrow L is applied to the root of the fixed eyelet 18, and the torque when rattle occurs in the eyelet 18 is defined as eyelet fixing strength. This eyelet fixation strength is
The strength can be increased by the conditions at the time of caulking. However, as the condition for increasing the eyelet fixing strength increases, the chipping failure that the opening of the through hole 17 is chipped increases.

FIG. 4 is a characteristic curve diagram showing the relationship between the eyelet fixation strength and the rate of occurrence of chipping failure of the insulating substrate 13 by manufacturing various electron tube built-in elements having different eyelet fixation strengths. As shown in the characteristic curve diagram, the conventional method was not able to suppress the occurrence of chipping defects to 0% even in obtaining the minimum required eyelet fixing strength (400 gf). Further, with the stepless chamfer 21 as shown in FIG. 5, chipping failure occurred at an eyelet fixing strength of 550 gf or more. However, according to the present invention, the generation rate of chipping could be suppressed to 0% even with twice the minimum required eyelet fixing strength. That is, the eyelet fixation strength could be dramatically improved without causing chipping defects. Further, in the color cathode ray tube using the electron tube built-in element of the present invention, a stable divided voltage can be supplied, and the poor clogging of the shadow mask can be reduced. (Other embodiments)

FIG. 6 shows another embodiment of the present invention, and the same effects as in the above embodiment can be obtained. That is, in this other embodiment, the outer diameter of the cylindrical portion 23 of the eyelet 22 before swaging is set in a range of 89 to 99% of the inner diameter of the through hole 17 of the insulating substrate 13. Then, as shown in FIG. 6, the inner wall of the through hole 17 is fixed by caulking the central portion 23a of the cylindrical portion 23 so as to expand outward. The tip 23b and the flange 23c of the cylindrical portion 23 also contribute to caulking, but the central portion 23a of the cylindrical portion 23 contributes most to caulking. The inventor prepared an insulating substrate having two kinds of through-hole diameters and four kinds of eyelets having a cylindrical part outer diameter, and carried out a caulking experiment. The results of an examination of the eyelet fixation strength are shown in Table 1 below and FIG.

[0021]

[Table 1]

According to Table 1, the outer diameter of the cylindrical portion 22a of the eyelet 22 is ideally 92 to 95% of the inner diameter of the through hole 17 of the insulating substrate 13, and 89 to 99% can be used. It turned out that it was a range. In the above experiment, the thickness of the insulating substrate 13 was the same for the two types, and the height of the eyelet cylindrical portion, the flange outer diameter, the material, and the hardness were the same for the four types. The crimping conditions were constant.

As a result of the above, a firm and firm caulking state can be obtained, and the eyelets 22 and the external connection partial pressure end 1
6 is stable and reliable. Therefore, the obtained electron tube built-in element is extremely reliable, and when used in a color cathode ray tube, excellent focus characteristics can be obtained, and a high quality color cathode ray tube can be provided.

In this embodiment, if the stepped chamfer shown in FIGS. 1 and 2 is performed, a more reliable fixing state can be obtained. In each of the above embodiments, the case where the electrode layer is a resistive layer has been described as an example. However, the present invention includes the case where the electrode layer forms a capacitance or other elements.

The electron tube built-in element of the present invention can be widely applied to not only a color cathode-ray tube but also an electron tube giving different potentials, such as an image pickup tube, an image tube, an X-ray tube, and a microwave tube. .

[0026]

According to the present invention, a stepped chamfer is formed in the opening of the insulating substrate having a through hole, and the eyelet caulking is closely adhered to the stepped chamfer. The chamfered portion serves as an escape, preventing the occurrence of chipping of the insulating substrate, and the caulking of the eyelet is closely attached to the chamfered step, so that the eyelet is hooked on the stepped portion, thereby improving the caulking strength.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are cross-sectional views showing a method of manufacturing a main part of an electron tube built-in element according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a part of FIG. 1;

FIG. 3 is a plan view showing a method of measuring eyelet fixation strength.

FIG. 4 is a characteristic curve diagram showing eyelet fixing strength and the rate of occurrence of chipping failure of an insulating substrate.

FIG. 5 is a sectional view showing a case of stepless chamfering.

FIG. 6 is a cross-sectional view showing a main part of an element for incorporating an electron tube according to another embodiment of the present invention.

FIG. 7 is a characteristic curve diagram showing the fixing strength of FIG.

FIG. 8 is a sectional view showing a main part of a general color cathode ray tube (around an electron gun structure).

FIG. 9 is a perspective view showing a conventional voltage dividing resistance element for a built-in electron tube.

10 is an exploded perspective view showing a main part of FIG. 9;

FIGS. 11A and 11B are cross-sectional views showing a method of fixing an eyelet.

FIG. 12 is a sectional view showing a conventional defect.

[Explanation of symbols]

13 ... insulating substrate, 14 ... resistance layer (electrode layer), 15 ... insulating coating layer, 16 ... end part for voltage division, 17 ... through-hole, 18 ... eyelet,
18a: cylindrical part, 18b: contact piece, 20: stepped chamfer.

Claims (2)

(57) [Claims] An electrode layer is formed on an insulating substrate, a through hole is formed through a predetermined portion of the electrode layer and the insulating substrate, and a metal eyelet for external connection is formed in the through hole. In the electron tube built-in element fixed by caulking so as to be electrically connected to, the stepped chamfering is performed on the opening of the insulating substrate of the through hole,
An element for incorporating an electron tube, wherein the caulked meat of the eyelet is brought into close contact with the stepped chamfer. 2. The electron tube built-in element according to claim 1, wherein the outer diameter of the cylindrical portion of the eyelet is set in a range of 89 to 99% of the inner diameter of the through hole of the insulating substrate.