JPH10302685A - Fluorescent display tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the slippage of a side surface member in the sealing of a flange part, and improve the reliability and yield by sealing the butted part of a plurality of side surface members constituting a spacer by the other adhesive member having a softening temperature higher than an adhesive member for the front glass and glass substrate forming an envelop together with the spacer to the spacer. SOLUTION: Each butted part 22 of glass straps 21a-21d of side wall members is fixed by an adhesive member such as high-temperature flit glass, whereby a spacer 20 is formed. When this spacer 20 is sealed to the reverse peripheral part of a front glass 10 and the flange part of a glass substrate 30 by an amorphous flit glass having a lower softening temperature, the fusion and softening of the adhesive member in the butted part 22 is prevented, and the movement or inclination of the side wall members are eliminated. The glass substrate 30 may have a polygonal, circular or elliptic form. The corner part including the butted part 22 of the side wall members is preferably covered with the amorphous flit glass, whereby the vacuum sealing capacity of an envelop is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display, and more particularly, to a flat fluorescent display provided with a spacer comprising a plurality of side wall members.

[0002]

2. Description of the Related Art A fluorescent display tube is provided with a filament (cathode),
The electron tube includes a grid (mesh) and a conductor (anode) coated with a phosphor in a display pattern as a basic electrode. FIG. 3 shows the structure of a conventional fluorescent display tube of the spacer frame type as an example of the related art. The fluorescent display tube shown in FIG.
And an envelope (vacuum container) configured by sealing the glass substrate 80. Here, the spacer 70 disposed between the windshield 60 and the glass substrate 80 is a spacer in which four glass strips 71 a to 71 d serving as side wall members are continuously arranged around the rear surface of the windshield 60. The butted portions 72 of the four glass strips 71a to 71d are melted and fixed by an adhesive member such as frit glass.

[0003] The fluorescent display tube is a glass strip 7 as described above.
It is manufactured by sealing the front glass 60 and the glass substrate 80 to the upper and lower surfaces of the spacer 70 composed of 1a to 71d with frit glass. More specifically, the spacer 7
A glass (a face glass) having a windshield 60 fixed to the upper surface of the glass substrate 80 is formed. A lead frame 90 is sandwiched between the face glass and the glass substrate 80.
A contact portion between the spacer 70 and the glass substrate 80, that is, a flange portion is sealed with amorphous frit glass. Here, the lead frame 90 is a metal component in which a frame on which the grid mesh 91 and the filament 92 are mounted and external leads are integrated. Although not shown in FIG. 3, an electrode (anode) formed by applying a phosphor in a display pattern is formed on the glass substrate 80. The exhaust pipe 73 is for evacuating the inside of the envelope. The spacer frame method using the lead frame 90 has been described above as an example, but the windshield 60 and the glass strips 71 a to 71 are described.
The structure and manufacturing method of the fluorescent display tube in which the spacer 70 made of “d” and the glass substrate 80 are sealed with frit glass, the grid mesh is directly mechanically and electrically formed on the glass substrate 80 without using the lead frame 90. The same applies to the self-supporting grid system that is bonded.

[0004]

As described above, in the conventional fluorescent display tube, the spacer 70 and the glass are used as the side wall member forming the spacer 70, that is, the adhesive member for fixing the butted portions of the glass strips 71a to 71d. The frit glass having the same softening temperature as the frit glass used for sealing the flange portion of the substrate 80 was used. As a result, when sealing the spacer 70 and the glass substrate 80, the frit glass of the abutting portion 72 of the glass strips 71a to 71d is softened, and the glass strips 71a to 71d may be inclined or moved. In particular, there is a problem that a defective product is obtained in terms of vacuum sealing. Such a problem is particularly remarkable in the spacer frame system in which the spacer 70 is disposed on the lead frame 90. An object of the present invention is to provide a fluorescent display tube in which a side wall member does not shift when a flange portion is sealed, and a method of manufacturing the same, and to improve the reliability and yield of the fluorescent display tube.

[0005]

In order to achieve the above object, a fluorescent display tube according to the present invention is characterized in that an abutting portion of a side wall member constituting a spacer has an amorphous frit glass used for sealing a flange portion. It is characterized by being melted and fixed by an adhesive member having a higher softening temperature. In other words, according to the present invention, as described in claim 1, a windshield, a glass substrate provided in parallel with the windshield, and a height arranged continuously around the rear surface of the windshield. A spacer comprising a plurality of side wall members having the same length, and an envelope comprising an adhesive member for sealing the spacer, the windshield and the glass substrate disposed between the windshield and the glass substrate. In the fluorescent display tube, the abutting portion of the plurality of side wall members constituting the spacer has a softening point temperature higher than a sealing temperature of an adhesive member for sealing the spacer with the windshield and the glass substrate. A fluorescent display tube characterized by being fixed by an adhesive member. The butting portions of the plurality of side wall members are fixed with the other adhesive member having a softening point temperature higher than the sealing temperature of the adhesive member for sealing the spacer, the windshield, and the glass substrate to form a spacer. Therefore, when the front glass and the glass substrate are sealed to the spacer, it is possible to prevent the adhesive member at the butt portion of the side wall member from melting and softening. As a result, the side wall member does not move or tilt,
A fluorescent display tube with stable quality can be obtained.

Here, as another adhesive member for fixing the butted portion of the side wall member, for example, high-temperature frit glass can be considered. On the other hand, the spacer, the windshield, and the glass substrate are sealed using amorphous frit glass having a softening point lower than that of the high-temperature frit glass.
However, the upper limit of the softening point temperature of the high-temperature frit glass is a condition that the melting and deterioration of the windshield, the glass substrate, and the side wall member are not caused.

The windshield and the glass substrate are generally rectangular in plan view, but in the present invention, the shape of these members is not limited to a rectangle, but a polygon other than a quadrangle or a circle. , May be elliptical. In particular, in the case of a polygon having a large number of strokes, the number of abutting portions increases, and each side wall member constituting each side easily moves or tilts in the peripheral portion of the back surface of the windshield,
The present invention in which the side wall member is fixed using an adhesive member having a softening point temperature higher than the sealing temperature with a glass substrate or the like is particularly effective in forming a polygonal spacer. Further, as the side wall member, for example, a glass strip can be considered, but the shape is not limited to the strip shape, and may have a curvature in plan view.

In the fluorescent display tube according to the present invention, the corner portion including the abutting portion of the side wall member may have:
It is covered with amorphous frit glass. By covering the butted portion of the side wall member with the amorphous frit glass, the vacuum sealing ability of the envelope can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view for explaining the configuration of a spacer frame type fluorescent display tube according to the first embodiment of the present invention. As shown in FIG. 1A, the fluorescent display tube according to the present embodiment has an outer periphery composed of a rectangular windshield 10, a glass substrate 30, and a spacer 20 disposed between these members. It has a vessel. Although not shown in FIG. 1A, the glass substrate 3
An electrode (anode) on which a phosphor is applied in a display pattern is formed on 0. When manufacturing a fluorescent display tube, a frame for attaching a grid mesh 41 and a filament 42 and a lead frame 40 in which external leads are integrated are sandwiched between the spacer 20 and the glass substrate 30, and then the spacer 20 and the glass substrate are sandwiched. Adhesive member for 30 flanges,
Specifically, after sealing with amorphous frit glass, the inside of the envelope is evacuated from the exhaust pipe 23.

FIG. 1B is a diagram showing the structure of the spacer 20. The spacer 20 is formed by abutting four glass strips 21a to 21d, which are side wall members, and fixing the abutting portion 22 with an adhesive member. As a result, a glass strip 21 having a predetermined size and constituting the spacer 20 is formed.
a to 21 d are arranged continuously around the rear surface of the windshield 10. Here, the adhesive member that fixes the butted portions 22 of the glass strips 21a to 21d is a high-temperature frit glass having a softening point higher than that of the amorphous frit glass that seals the spacer 20 and the flange portion of the glass substrate 30 described above. Is used. At this time, the spacer 2
The amorphous frit glass that seals the upper surface of the glass substrate 0 and the peripheral portion of the back surface of the front glass 10 and the spacer 20 and the flange portion of the glass substrate 30 has a softening point temperature of about 380 to 400 ° C. The high-temperature frit glass for fixing the butted portions 22a to 21d has approximately 49
One having a softening point temperature of 0 to 510 ° C is used.

[0011] The fluorescent display tube having the above configuration is
It can be manufactured by the following steps. First, abutting portions 22 of a plurality of glass strips 21a to 21d having a predetermined size are fixed with frit glass to form a spacer 2
0 is formed. Here, the butted portions 22 of the glass strips 21a to 21d are fixed with a high-temperature frit glass having a softening point temperature of about 490 to 510 ° C. More specifically,
After printing and applying, for example, NEG frit GA-0951 to the adhesive portion of the glass strips 21a to 21d and calcining,
The butt 22 is melted and fixed by a burner,
0 is formed.

Next, the front glass 10 is fixed on the upper surface of the spacer 20 with amorphous frit glass to form a face glass. The amorphous frit glass used here has a lower softening point temperature than the high-temperature frit glass used to fix the butted portions 22 of the glass strips 21a to 21d in the previous step. Then, the lead frame 40 is sandwiched between the bottom surface of the spacer 20 and the glass substrate 30, and the flange portion is sealed with amorphous frit glass. The amorphous frit glass used here is also a glass strip 2.
It has a softening point lower than that of the high-temperature frit glass used to fix the butted portions 22a to 21d. As the amorphous frit glass for sealing the spacer 20 and the glass substrate 30, or the spacer 20 and the windshield 10, a material having a softening point temperature of about 380 to 400 ° C, such as LS-0118 frit, is suitable.

As described above, the high-temperature frit glass to which the glass strips 21a to 21d constituting the spacer 20 are fixed includes the windshield 10, the spacer 20, and the glass substrate 3.
0 has a higher softening point temperature than the amorphous frit glass used for sealing 0, so that when sealing the spacer 20 with other members, the high-temperature frit glass of the butted portion 22 of the glass strips 21a to 21d is Melting can be prevented.

After the members constituting the envelope are sealed, the envelope is evacuated from the exhaust pipe 23 to vacuum seal the envelope, and finally, unnecessary portions of the lead frame 40 are cut off leaving the external leads. I do.

As described above, in the fluorescent display tube according to the present embodiment, the adhesive member for sealing the spacer 20 and the windshield 10 and the spacer 20 and the glass substrate 30 is formed by the glass strip 21a constituting the spacer 20. ~ 21d
Has a softening point lower than that of the high-temperature frit that secures the butted portion 22 of the first and second portions. Therefore, if the spacer 20 and the glass substrate 30 are sealed at about 450 to 480 ° C., the high-temperature frit of the butted portion 22 of the glass strips 21 a to 21 d constituting the spacer 20 does not melt. Therefore, even if the lead frame 40 is sandwiched between the spacer 20 and the glass substrate 30, the glass strips 21a to 21d
It can be prevented from moving or inclining when sealing. As a result, it is possible to obtain a fluorescent display tube with stable quality while suppressing the occurrence of defective products, and to reduce the manufacturing cost.

Next, a second embodiment of the present invention will be described with reference to FIG. The fluorescent display tube according to the present embodiment,
In the fluorescent display tube according to the first embodiment described above, the corners of the spacer 20 including the butted portions 22 of the glass strips 21a to 21d are covered with amorphous frit glass. Therefore, the windshield 10 and the spacer 2 that constitute the fluorescent display tube according to the present embodiment.
The components 0, the glass substrate 30, the lead frame 40, and the like are the same as those in the first embodiment shown in FIG.

FIG. 2 is a side view of such a fluorescent display tube. FIG. 2A is a front view of the glass strip 21a, and FIG. 2B is a front view of the glass strip 21b. Note that the lead frame 40 shown in FIG.
Is omitted. Windshield 10 and spacer 2
Numeral 0 is bonded with amorphous frit glass 51. In addition, the spacer 20 and the glass substrate 30 are sealed with an amorphous frit glass 52 at a flange portion. In the present embodiment, in particular, as shown in FIG.
A corner portion including the butted portion 22 of the glass strips 21 b and 21 c constituting the spacer 20 is covered with the amorphous frit glass 53. These are the glass strips 21a and 21
The same applies to the remaining three corner portions including the butting portions 21b and 21c and 21d and 21a. Such a fluorescent display tube includes a windshield 10, a spacer 2
After the envelope is formed by sealing the glass substrate 30 and the glass substrate 30, each corner is covered with the amorphous glass 53. At this time, the amorphous glass 53 covering each corner portion is made of the glass strips 21 a to 21 a forming the spacer 20.
Needless to say, it has a softening point lower than that of the high-temperature frit glass fixing the butted portion 22 of 21d.

By covering the corners with amorphous frit glass as described above, it is possible to particularly improve the vacuum sealing property of the butted portions 22 of the glass strips 21a to 21d constituting the spacer 20.

Although the above embodiment has been described by taking the fluorescent display tube of the spacer frame type as an example, it goes without saying that the present invention can also be applied to a fluorescent display tube of the self-standing grid type.

[0020]

According to the present invention, the butt portion of the side wall member constituting the spacer is formed by using another adhesive member having a higher softening point temperature than the adhesive member for sealing the spacer with the windshield and the glass substrate. Since the members are fixed, it is possible to prevent the other adhesive member from melting and moving or tilting the side wall member when each member is sealed. Therefore, the generation of defective products can be suppressed, and as a result, the quality of the fluorescent display tube can be stabilized and the manufacturing cost can be suppressed.

Further, according to the second aspect of the present invention, the vacuum sealing ability of the butted portion of the side wall member constituting the spacer can be increased, and the quality of the fluorescent display tube can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a fluorescent display tube according to an embodiment of the present invention.

FIG. 2 is a side view of the fluorescent display tube according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating a conventional fluorescent display tube.

[Explanation of symbols]

10: windshield, 20: spacer, 21a-21
d: glass strip, 22: butted portion, 23: exhaust pipe,
Reference numeral 30: glass substrate, 40: lead frame, 41: grid mesh, 42: filament, 51, 52, 53
... Amorphous frit glass.

Claims (2)

[Claims] 1. A windshield, a glass substrate provided in parallel with the windshield, a spacer comprising a plurality of equal-height side wall members disposed continuously around a rear surface of the windshield, and A fluorescent display tube provided with an envelope comprising a spacer disposed between a windshield and the glass substrate, and an adhesive member for sealing the windshield and the glass substrate; The butting portion of the side wall member is fixed by another adhesive member having a softening point temperature higher than a sealing temperature of an adhesive member for sealing the spacer, the windshield and the glass substrate. Fluorescent display tube. 2. The fluorescent display tube according to claim 1, wherein a corner portion of the side wall member including an abutting portion is covered with amorphous frit glass.