KR100243707B1 - Fluorescent display tube - Google Patents

Abstract

It is possible to provide a fluorescent display tube with a high display quality, which is capable of taking more members from the metal plate of the material, the structure of which is provided with a negative electrode, and the structure is simple and can cope with the automation of manufacturing.

The envelope 2 includes a positive electrode substrate 3, a front plate 4, and a side plate 5. On the inner surface of the positive electrode substrate is a positive electrode 6, on which the negative electrode 10 is struck through the support member 20. The conductive support 19 is press-fitted into the support hole 22 of the support 23 of the support member 20 and is held between the positive electrode substrate and the front plate. The getter 14 is fixed to the conductive support 19. The conductive support 19 is in surface contact with the transparent conductive film 11. Since the support member 20 has a simple shape without a getter shield, the pitch is small, cost is reduced, and the assembly process is simplified when taken from the plate of material.

Description

Fluorescent tube

1 is a view showing the getter container and the conductive support in the first embodiment.

2 is a view showing a state before molding of the anchor member in the first embodiment.

3 is a sectional view of the fluorescent display tube of the first embodiment;

4 is a view showing the getter container and the conductive support in the second embodiment.

5 is a view showing a state before molding of an anchor member in a conventional fluorescent display tube.

6 is a cross-sectional view of a conventional fluorescent display tube.

<Explanation of symbols for main parts of drawing>

2: external atmosphere 6: anode as display unit

10: cathode 11: transparent conductive film as conductive film

14, 24: getter 19: conductive post

20: Support member as a member for tightly mounting a negative electrode of a negative electrode (hereinafter referred to as negative electrode installation member)

23: support

[Industrial use]

The present invention relates to a fluorescent display tube having a getter inside the envelope, and more particularly, to a holding structure of a getter.

[Prior art]

The fluorescent display tube 1 shown in FIG. 6 has an envelope 2 whose interior is in a high vacuum state. The envelope 2 is a side surface provided between the positive electrode substrate 3, the front plate 4 facing the positive electrode substrate 3, and the outer peripheral edge portion of the inner surface of the positive electrode substrate 3 and the front plate 4. It is a box-shaped container which sealed the board | plate 5 with the sealing material. On the inner surface of the positive electrode substrate 3, a positive electrode 6 having a phosphor is provided, and a control electrode 7 is provided thereon. On the inner surface of both ends of the positive electrode substrate 3, a support member 8, which is a negative electrode mounting member, and an anchor member 9 having a spring property, are welded to a frame, and a filament-shaped negative electrode is formed between both members 8 and 9, respectively. 10) is provided taut with a predetermined tension. On the inner surface of the front plate 4, a transparent conductive film 11 for blocking the electric field influence outside the envelope 2 and preventing charge of electrons is deposited. A contact lead 12 is integrally formed on one side of the negative electrode mounting member, for example, the anchor member 9, and is in contact with the transparent conductive film 11. In addition, a getter shield 13 is integrally formed on the support member 8, which is one of the negative electrode mounting members, and a getter 14 is provided at its tip.

[Problems that the invention tries to solve]

As shown in Fig. 5, the support member 8 is a member having a substantially large plate shape. On one edge side of the support member 8, a plurality of holding portions 8a are provided along the longitudinal direction in order to fix each one end of the plurality of filament-shaped cathodes 10. On the other edge side of the support member 8, an elongated getter shield 13 which extends in a direction perpendicular to the longitudinal direction is provided. The support member 8 of such a shape structure is integrally formed by conveying and pressing a metal plate one by one. Therefore, in order to take the plurality of support members 8 from one metal plate so as to be parallel to each other, the distance between the support members 8 and 8 adjacent to each other by the length of the getter shield 13 must be large.

Therefore, there is a problem that the number of support members 8 that can be taken as a single metal plate is small, and there are many parts that are not effectively used in the metal plate. The anchor member 9 is a substantially large plate-shaped member. At one edge of the anchor member 9, a plurality of leaf spring-shaped arm portions 9a are provided along the longitudinal direction in order to apply tension by holding each one end of the plurality of filament-shaped cathodes 10. Moreover, the contact lead 12 long in the direction which cross | intersects the longitudinal direction is provided in the other edge side of the anchor member 9. As shown in FIG. In order to take the plurality of anchor members 9 from a single metal plate, the distance between the adjacent anchor members 9 and 9 must be large as long as the length of the contact tape 12. Therefore, like the support member 8, in the case of the anchor member 9, there is a problem that the number of anchor members 9 that can be taken from one sheet of metal is small, and there are many parts that are not effectively used in the metal sheet.

In addition, the getter shield 13 of the support member 8 and the contact shield 12 of the anchor member 9 are not only complicated in shape, but must also be formed into a predetermined shape by pressing after being formed by etching from a metal plate. There was a problem that the process was complicated and difficult to automate.

In addition, the contact strip 12 of the anchor member 9 formed of the metal plate has a thin and long plate shape, and because the tip is tapered, the contact strip 12 is in contact with the transparent conductive film 11 at approximately a point. When a high voltage is applied, the transparent conductive film 11 ) Had the problem of being destroyed.

In addition, the getter shield 13 of the support member 8 is disposed on the opposite side of the holding portion 8a holding the cathode 10, i.e., the inner side close to the anode 6, and the getter 14 is placed at the bent end. Since the gap between the anode 6 and the getter 14, which is the display portion, is narrowed, the getter 14 has a problem that the viewing angle of the display is narrowed.

In addition, since the contact lead 12 of the anchor member 9 is disposed on the inner side closer to the positive electrode 6 than the arm portion 9a holding the negative electrode 10, the positive electrode 6 and the contact lead 12, which are display portions, are disposed. There is a problem in that the interval between the?) Becomes narrow, and the light from the anode 6 is reflected on the contact lead 12 to lower the display quality.

An object of the present invention is to provide a fluorescent display tube with a larger number of negative electrode mounting members from a metal plate of a material, its structure is simple and can cope with the automation of manufacturing, the contact of the transparent conductive film is sure and the display quality is high. Doing.

[Means for solving the problem]

The fluorescent display tube according to claim 1 comprises: an enclosure having a high vacuum inside, a cathode mounting member provided on the first inner surface of the envelope, a filament-shaped cathode provided in the envelope by the cathode mounting member; 1. A fluorescent display tube having a display portion formed on an inner surface, a transparent conductive film formed on a second inner surface facing the first inner surface, and a getter provided inside the envelope, the conductive support on which the getter is installed, and the cathode. It is characterized by having a support part formed in the elongation member and supporting the said electroconductive support post.

The fluorescent display tube according to claim 2 is characterized in that, in the fluorescent display tube according to claim 1, the cross section of the conductive post is in surface contact with the transparent conductive film in the inside of the envelope.

[Action]

The conductive support provided with the getter is supported on the supporting portion of the negative electrode mounting member and is in surface contact with the transparent conductive film formed on the inner surface of the envelope. Since the negative electrode installation member of the negative electrode has a simple shape without a contacttrid or getter shield, the pitch when taken from the plate of material is small, thereby reducing manufacturing costs and simplifying the process.

EXAMPLE

A first embodiment of the present invention will be described with reference to FIGS. In the fluorescent display tube of this embodiment, the structure of the negative electrode mounting member of the filament-shaped negative electrode 10 is different from the conventional one. The structure and functions of the envelope 2 having the transparent conductive film 11 on its inner surface, the filament-shaped cathode 10, the control electrode 7, the anode 6, and the like are described with reference to FIG. 6. It is approximately the same as the display tube.

The getter 14 is composed of the getter container 15 and the getter material 16 housed in the getter container 15. As shown in FIG. 1, the getter container 15 has a substantially annular shape with a round hole 17 penetrating the center thereof, and has a circumferential groove portion 18 along the outer circumferential edge of the upper surface. The getter material 16 is accommodated in the circumferential groove 18. The conductive support 19 is press-fitted to the round hole 17 in the center of the getter container 15, and the getter container 15 is fixed to the conductive support 19. The conductive post 19 is made of 422 alloy (42% nickel, 2% chromium, balance iron), and its shape is columnar. The length of the conductive support 19 is set approximately equal to the distance between the positive electrode substrate 3 and the front plate 4 constituting the envelope 2. In this embodiment, although 422 alloy is used for the conductive support 19, a 426 alloy having a thermal expansion coefficient close to glass may be used.

As shown in FIG. 2, in the fluorescent display tube of the present embodiment, the support member 20, which is the negative electrode mounting member of the negative electrode 10, is a member having a substantially large plate shape having a shape as shown in FIG. It was blanked by press working. On one edge side of the support member 20, a plurality of holding portions 21 are provided along the longitudinal direction to fix each one end of the plurality of filament-shaped cathodes 10. As shown in FIG. Side by side with these holding parts 21, the support part 23 provided with the support hole 22 for inserting and holding the said electroconductive support 19 is formed. The dimensions of the support 23 are slightly larger than the retainer 21 of the cathode 10, but considerably smaller than the elongated getter shield 13 of the support member 8 of the conventional fluorescent display tube. Therefore, as shown in FIG. 2, when the metal plates are sequentially transferred and pressed to form a plurality of support members 20 integrally, the distance between the support members 20 and 20 parallel to each other may be increased as in the prior art. There is no need. For this reason, the number of support members 20 which can be taken from a single metal plate increases, and a metal plate can be used effectively.

As shown in FIG. 3, each part of the said support member 20 is shape | molded. In particular, the supporting portion 23 is formed so that the portion where the supporting holes 22 are formed is parallel to the positive electrode substrate 3. The conductive support 19 is inserted into the support hole 22, and the support member 20 is provided on the positive electrode substrate 3 so that the negative electrode 10 is provided tautly. In the state where the enclosure 2 is formed from the positive electrode substrate 3, the front plate 4, and the side plate 5, the conductive support 19 is formed between the positive electrode substrate 3 and the front plate 4, It is held in a vertical position with respect to (3,4). The conductive support 19 is in surface contact with the transparent conductive film 11 formed on the inner surface of the front plate 4. Since the conductive support 19 is columnar and contacts the transparent conductive film 11 at one circular end face having a sufficient area, the electrical connection between the transparent conductive film 11 and the support member 20 is secure. As shown in FIG. 3, the getter 14 is disposed outside the support member 20, i.e., outside the anode 6, so that the gap between the anode 6 and the getter 14, which is the display portion, is zero. It becomes wider than the conventional example shown in FIG. 6, and the getter 14 does not disturb display.

As described above, in the present embodiment, the conductive support 19 supporting the getter 14 serves as a contacttrid of the transparent conductive film 11. Therefore, although not shown, the anchor member of the present embodiment does not have a conventional contact tree. For this reason, when forming a plurality of anchor members integrally by sequentially conveying and pressing a metal plate, it is not necessary to make large space | interval of the anchor members parallel to each other like conventionally. For this reason, the number of anchor members which can be taken from a single metal plate increases, and a metal plate can be used effectively.

With reference to FIG. 4, only portions different from the first embodiment of the second embodiment will be described. In this embodiment, the conductive support 19 is fixed to a part of the outer circumferential surface of the disc shaped getter container 25 by welding. There is no hole in the center of the getter container 25. The configuration of the getter material 16 itself and the conductive post 19 itself are substantially the same as in the first embodiment. Also in this embodiment, the same effects as in the first embodiment can be obtained.

[Effects of the Invention]

According to the fluorescent display tube of the present invention, a getter was provided on a conductive post, held on a support formed on the negative electrode mounting member, placed in an enclosure, and brought into contact with a transparent conductive film on the inner surface of the enclosure. According to such a structure, since the negative electrode installation member of a negative electrode can be taken in larger number from the metal plate of a material, the yield of a material is favorable and manufacturing cost can be reduced. In addition, since the shape and structure of the negative electrode mounting member are simplified, it is easy to automate the manufacturing process. In addition, since the conductive support and the transparent conductive film are reliably in contact with each other, the withstand voltage is high and the risk of heat generation is small. In addition, since the conductive support holding the getter can be provided away from the anode, the display portion can be separated from the getter, and the viewing angle of the fluorescent display tube is widened. In addition, since the conductive support connecting the transparent conductive film and the negative electrode mounting member can be provided away from the anode, the light from the anode is reflected on the conductive support so that the display quality is not lowered.

Claims (2)

An enclosure having a high vacuum inside and a cathode installation member provided on the first inner surface of the enclosure, a filament-shaped cathode provided in the envelope by the cathode installation member, a display portion formed on the first inner surface, and the 1. A fluorescent display tube having a transparent conductive film formed on a second inner surface facing an inner surface and a getter provided inside the envelope, wherein the conductive support is provided with the getter and the cathode mounting member is formed to support the conductive support. Fluorescent display tube characterized in that it has a support. The fluorescent display tube according to claim 1, wherein a cross section of the conductive post is in surface contact with the transparent conductive film inside the envelope.