JP3019293U - Fluorescent display tube - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a fluorescent display tube of high quality and high reliability, in which filament breakage and separation of electron-emitting material do not occur even when an extremely large impact is applied by dropping or the like. [Structure] A pair of L-shaped filament support members 6 made of a 426 alloy plate material having a plate thickness of about 200 μm has a filament spring fixing member 9 made of a SUS631 alloy plate material having a plate thickness of about 50 μm placed on one of them. On the filament spring fixing member 9, as shown by hatching, a reinforcing plate 11 made of a 426 alloy plate having a plate thickness of about 200 μm is placed and fixed by welding. That is, the reinforcing member 11 is attached and fixed on the filament spring fixing member 9 of one filament support body 6, and the filament support body 6 has a structure in which the base portion joined to the anode substrate 5 is mechanically reinforced. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluorescent display tube that performs display by utilizing the light emission of a phosphor excited by a low-speed electron beam. In particular, the fluorescent material has a filament support structure in which the filament is not easily broken even when a large impact such as a drop is applied. It concerns display tubes.

[0002]

[Prior art]

 5 and 6 are views for explaining the structure of a conventional fluorescent display tube, FIG. 5 (a) is a plan view with a cover glass removed, and FIG. 5 (b) is FIG. 5 (a). 5A is a cross-sectional view taken along the line AA ′ of FIG. 5, FIG. 5C is a cross-sectional view taken along the line BB ′ of FIG. 5A, and FIG. 6A is a perspective view of FIG. 5C. 6 (b) is a sectional view taken along the line CC ′ of FIG. 5 (a), FIG. 6 (c) is a sectional view taken along the line DD ′ of FIG. 5 (a), and FIG. 6 (c) is shown in each perspective view.

In FIGS. 5 and 6, a plurality of display segments 3 made of a phosphor and a plurality of mesh-shaped control electrodes 4 covering each display segment 3 are arranged on an insulating film 2 formed on the surface of a glass substrate 1. A pair of L-shaped filament supports 6 are disposed opposite to each other on both ends of the anode substrate 5 in the longitudinal direction, and a linear filament 7 is provided between the pair of filament supports 6. Is stretched. The anode base plate 5 has a structure in which a vacuum container is formed by hermetically sealing a peripheral edge portion 8 with a face glass (cover glass) (not shown) by frit glass (not shown).

It should be noted that the pair of filament supports 6 is usually provided with a reinforcing frame (not shown), and the filament 7 is stretched, and the frit glass is placed in a predetermined position on the anode substrate 5. Then, the cover glass and the anode substrate 5 are sealed together. At the time of this sealing, the pair of filament supports 6 is also fixed by the frit glass at the portion sandwiched between the cover glass and the anode substrate 5. After that, the above-mentioned reinforcing frame is cut and removed to be attached.

The pair of filament supports 6 has a structure in which both short-side ends of the anode substrate 5 penetrate the peripheral edge 8 of the cathode substrate 5 and project outward. If the plate thickness is large, a sealing failure tends to occur in the airtight sealing between the anode substrate 5 and the cover glass (not shown). Therefore, normally, a 426 alloy plate material having a plate thickness of about 200 μm is used.

Further, the 426 alloy plate material forming the pair of L-shaped filament supports 6 is in a wet hydrogen atmosphere at about 1100 ° C. so as to be airtightly bonded to the anode substrate 5 and a cover glass (not shown) by frit glass. It is used by heating it at a temperature to form an oxide film such as chromium on the surface. Further, the pair of L-shaped filament supports 6 is integrally attached to one side with a filament spring fixing member 9 for applying a proper tension to the filament 7, and the other side is provided with terminals for fixing the filament. The filament fixing member 10 is integrally attached by welding or the like.

Further, the filament spring fixing member 9 and the filament fixing member 10 are made of SUS631 alloy having a plate thickness of 50 to 80 μm in view of controllability of tension applied to the filament 7 and ease of press workability. Plates and SUS304 alloy plate are often used.

[0008]

[Problems to be solved by the device]

 However, in the fluorescent display tube thus configured, the filament 7 may be broken when a very large impact exceeding about 1000 G is applied due to a drop during transportation or mounting on a product. Further, although the filament 7 is not broken, the filament 7 vibrates greatly due to the impact and hits the control electrode 4 arranged on the display segment 3 to coat the surface of the filament 7 with an electron-emitting substance. There is a problem that (Ba, Sr, Ca oxides) are peeled off and it becomes difficult to emit electrons.

Therefore, the present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to cause filament disconnection and separation of electron-emitting materials even when an extremely large impact is applied by dropping or the like. It is to provide a fluorescent display tube of high quality and high reliability.

[0010]

[Means for Solving the Problems]

 In order to achieve such an object, the fluorescent display tube according to the present invention has a reinforcing material attached to at least one of a pair of L-shaped filament support members. Further, in another fluorescent display tube, at least one of the pair of L-shaped filament supports is made thicker in the vacuum container than in the peripheral portion of the anode substrate.

[0011]

[Action]

 In the present invention, by attaching a reinforcing material to at least one of the pair of L-shaped filament supports or by increasing the thickness of the filament support in the vacuum container, the rigidity is increased, so that a very large impact is applied. At that time, it is difficult for the filament to break or the electron-emitting substance to peel off.

[0012]

【Example】

 As a result of various investigations, the present inventors have found that the filament breakage and the peeling of the electron-emitting material when a large impact is applied are closely related to the vibration of the filament support, and the present invention was accomplished. That is, in the conventional fluorescent display tube, a 426 alloy plate material having a plate thickness of about 200 μm is used for the filament support 6, but this 426 alloy plate material is heat-treated in a wet hydrogen atmosphere at about 1100 ° C. Therefore, the material is extremely soft. Further, since the plate thickness of the SUS631 alloy plate material and the SUS304 alloy plate material used for the filament spring fixing member 9 and the filament fixing member 10 is as thin as 50 to 80 μm, they do not have sufficient strength and when an impact is applied. It was found to vibrate and lead to filament breakage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (Embodiment 1) FIG. 1 is a view for explaining a configuration of an embodiment of a fluorescent display tube according to the present invention, FIG. 1 (a) is a plan view with a cover glass removed, and FIG. 1) shows sectional views taken along the line AA 'in FIG. 1A, and the same parts as those in FIGS. 5 and 6 described above are denoted by the same reference numerals. In FIG. 1, a pair of L-shaped filament supports 6 made of a 426 alloy plate having a plate thickness of about 200 μm are provided on one side (right side in the figure) of a filament spring fixing member 9 made of a SUS631 alloy plate having a plate thickness of about 50 μm. Further, as shown by hatching on the filament spring fixing member 9, a reinforcing plate 11 made of a 426 alloy plate having a plate thickness of about 200 μm is placed and welded and fixed. 5 and FIG. 6 is different from FIG. 5 and FIG. 6 in that the reinforcing member 11 is attached and fixed on the filament spring fixing member 9 of the one filament supporting member 6 so that the filament supporting member 6 is mechanically reinforced. There is.

(Embodiment 2) FIG. 2 is a view for explaining the structure of a fluorescent display tube according to another embodiment of the present invention. FIG. 2 (a) is a plan view with a cover glass removed, 2B is a sectional view taken along the line AA 'in FIG. 2A, and the same portions as those in FIGS. 5 and 6 described above are denoted by the same reference numerals. 2 is different from FIGS. 5 and 6 in that a pair of L-shaped filament supports 6 made of a 426 alloy plate material with a plate thickness of about 200 μm is about 50 μm above the other (left side in the figure). The filament fixing member 10 made of the SUS631 alloy sheet is placed, and the reinforcing plate 11 made of the 426 alloy sheet having a thickness of about 200 μm is placed on the filament fixing member 10 as shown by hatching. It is fixed by welding. 5 is different from FIG. 5 in that the reinforcing material 11 is attached and fixed on the filament fixing member 10 of the other filament supporting body 6, and the filament supporting body 6 has a structure that is mechanically reinforced.

(Embodiment 3) FIG. 3 is a plan view showing a structure of a fluorescent display tube according to another embodiment of the present invention with a cover glass removed, and FIG. 5 and FIG. The same parts as 6 are designated by the same reference numerals. 3 is different from FIG. 5 and FIG. 6 in that the pair of L-shaped filament support members 6 has a reinforcing member 11 as shown by hatching on the filament spring fixing member 9 and the filament fixing member 10, respectively. Are attached and fixed, and both of the pair of L-shaped filament supports 6 are mechanically reinforced.

After the structure of the anode substrate 5 thus constructed was formed into a tube, a drop test was conducted to examine the occurrence of disconnection of the filament 7. As for the dropping, the anode substrate 5 side was turned downward and dropped on the decorating plate 5 times at each height. The number of tests was 10 each. The results are shown in Table 1 below. In Table 1, the denominator indicates the number of test tubes, and the numerator indicates the number of tubes in which filament disconnection occurred.

[0017]

[Table 1]

In Table 1, in the conventional fluorescent display tube, disconnection occurred in 5 out of 10 tubes up to a drop height of 5 cm. However, the filament spring fixing member 9 and the filament fixing member 10 according to the present embodiment were broken. In the structure in which the reinforcing plate 11 was attached to either one of them, disconnection did not occur up to a drop height of 5 cm. Furthermore, in the case where both the filament spring fixing member 9 and the filament fixing member 10 were fixed, no wire breakage occurred up to a drop height of 10 cm.

In addition, in the above-mentioned embodiment, the case where the 426 alloy plate material is used as the reinforcing plate 11 has been described, but the present invention is not limited to this, and for example, the SUS304 alloy plate material is used. Also, the same effect as described above was obtained.

(Embodiment 4) FIG. 4 is a view for explaining the structure of a fluorescent display tube according to another embodiment of the present invention. FIG. 4 (a) is a plan view with a cover glass removed, FIG. 4B is a sectional view taken along the line BB ′ of FIG. 4A, and the same portions as those in FIGS. 5 and 6 described above are denoted by the same reference numerals. 5 is different from FIGS. 5 and 6 in that the pair of L-shaped filament supports 6A arranged at both ends in the longitudinal direction of the anode substrate 5 are made of a 426 alloy plate material and are covered with a cover glass (not shown). The inner portion of the vacuum container is formed by the thick portion 6a having a plate thickness of about 300 μm, and the peripheral edge portion 8 sealed by the cover glass is half-etched, and the thin portion has a plate thickness of about 200 μm. 6b, the filament spring fixing member 9 and the filament fixing member 10 are welded and fixed on the thick portions 6a.

After the structure of the anode substrate 5 thus configured was formed into a tube, a drop test was conducted in the same manner as in Examples 1 to 3 described above to examine the occurrence of disconnection of the filament 7. . The results are shown in Table 2 below. The thin portions 6b of the pair of L-shaped filament supports 6A are half-etched to have a thickness of about 200 μm. The reason for this is that if the thickness of this portion is increased, the sealing failure in sealing with the cover glass will occur. This is because it tends to occur.

[0022]

[Table 2]

In Table 2, in the conventional fluorescent display tube, filament breakage occurred at a drop height of 5 cm. However, in the fluorescent display tube structure according to the present embodiment, no filament breakage occurs at a drop height of 5 cm. Did not occur.

In the above-described embodiment, the case where the filament support structure is applied to the front view type fluorescent display tube has been described, but the present invention is not limited to this, and the reverse view type fluorescent display tube is not limited thereto. It goes without saying that the same effect as described above can be obtained even when applied to a fluorescent display tube.

[0025]

[Effect of device]

 As described above, according to the present invention, the reinforcing material is attached to at least one of the pair of filament supports, or the plate thickness of at least one of the pair of filament supports is set to the peripheral portion of the anode substrate. The thicker part inside the vacuum container increases the rigidity of the filament support, so even if the fluorescent display tube is subjected to an extremely large impact such as a drop, filament breakage or peeling of electron emitting material will occur. It has an extremely excellent effect that it is less likely to occur and a fluorescent display tube of high quality and high reliability can be obtained.

[Brief description of drawings]

FIG. 1 is a view for explaining a configuration of an embodiment of a fluorescent display tube according to the present invention.

FIG. 2 is a view for explaining a structure of another embodiment of the fluorescent display tube according to the present invention.

FIG. 3 is a plan view illustrating a structure of a fluorescent display tube according to another embodiment of the present invention.

FIG. 4 is a view for explaining a structure of another embodiment of a fluorescent display tube according to the present invention.

FIG. 5 is a diagram for explaining the configuration of a conventional fluorescent display tube.

FIG. 6 is a diagram for explaining the configuration of a conventional fluorescent display tube.

[Explanation of symbols]

1 ... Glass substrate, 2 ... Insulating film, 3 ... Display segment, 4
... control electrode, 5 ... anode substrate, 6 ... filament support,
6a ... Thick part, 6b ... Thin part, 6A ... Filament support, 7 ... Filament, 8 ... Peripheral part, 9 ... Filament spring fixing member, 10 ... Filament fixing member, 11 ... Reinforcing plate.

Claims (2)

[Scope of utility model registration request] 1. A fluorescent display tube in which a pair of L-shaped filament supports on which a thermoelectron emissive filament is stretched are arranged at both ends in the longitudinal direction on an anode substrate, and the anode substrate is sealed by a cover glass. A fluorescent display tube, wherein a reinforcing material is attached to at least one of the pair of L-shaped filament supports. 2. A fluorescent display tube in which a pair of L-shaped filament supports for stretching a thermoelectron emissive filament are arranged at both ends in the longitudinal direction on an anode substrate, and the anode substrate is sealed by a cover glass. A fluorescent display tube characterized in that at least one of the pair of L-shaped filament supports has a plate thickness in a vacuum container larger than a plate thickness of a sealing portion on the anode substrate sealed by the cover glass.