JP2003331758A - Antistatic cathode-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antistatic cathode-ray tube that is superior in workability, safety, and operation stability and has suppressed to the minimum increase of manufacturing cost, when a conductive film is pasted on the display surface and grounded in order to prevent charging on the display screen of the cathode-ray tube. <P>SOLUTION: When a conductive pressure sensitive adhesive tape 3 is wound as a bed of an explosion-proof band 55 to be installed on the outside face 51 of a panel glass part 51, the side edge part 3a is made to hang on the display surface 11b, and thereby, the protruded part 2a, 2b of the anti-static film to be pasted on the display surface 11b overlaps with this, and the explosion-proof band 55 and the anti-static film 2 are electrically conducted through the conductive pressure sensitive adhesive tape 3. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic Braun tube having a display surface provided with antistatic measures, and particularly to an antistatic Braun tube having a conductive film attached to the display surface.

[0002]

2. Description of the Related Art FIG. 7 is an external perspective view showing a configuration of a main part of a conventional antistatic Braun tube, and FIG. 9 is a partial cross section of a cross section including an instruction line 100 in FIG. It is a figure.

In each drawing, the glass bulb forming the outer circumference of the cathode ray tube 50 is roughly divided into a panel glass portion 51, a funnel portion 52, and a neck portion 53. On the panel outer surface 51a of the panel glass portion 51, a metal explosion-proof band 55 for tightening the peripheral surface of the cathode-ray tube 50 in order to prevent the implosion of the cathode-ray tube 50 is provided via an explosion-proof tape 54 which is a base layer thereof. ing.

The display surface 51b of the panel glass portion 51
A conductive layer for preventing electrification is formed on. The conductive layer is formed by a wet method, a sputtering method, a conductive film sticking method, or the like. Here, the conductive film 56 is stuck on the display surface 51b of the panel glass part 51 based on the conductive film sticking method. ing.

FIG. 8 shows a general laminated structure of this conventional conductive film 56. A panel is provided on one side of a base material 56b made of an insulating material such as acrylic, glass or PET. An adhesive layer 56a is formed so as to be in contact with the display surface 51b of the glass part 51, and the conductive layer 56a is formed on the opposite surface side.
c is formed. Further, since the base material 56b needs to have a certain degree of rigidity, it is formed to be much thicker than the other layers.

As shown in FIGS. 7, 8 and 9, a metal conductive tape 57 is provided between the conductive film 56 and the explosion-proof band 55 to ground the conductive layer 56c of the conductive film 56. It is affixed at two places, top and bottom. As a result, the explosion-proof band 55 and the conductive film 56 are electrically conducted, and the explosion-proof band 56 is grounded as shown in FIG. 7, so that the conductive film 56 is also grounded.

FIG. 10 shows the conductive layer 5 of the conductive film 56.
In order to ensure the electrical connection between 6c and the conductive tape 57, the conductive layer 56c is provided with an electrode 58 made of a conductive paste or solder.

FIG. 11 shows another conventional example of Japanese Patent Laid-Open No. 63-63.
FIG. 12 is an external perspective view of the cathode ray tube 61 showing the method disclosed in Japanese Patent No. 43246, and FIG. 12 is a cross-sectional view of the relevant part.

In this method, the conductive adhesive tape 63 is wound around the panel outer surface 64a of the panel glass portion 64 as a base layer of the explosion-proof band 62. Before this winding, the conductive adhesive tape 63 is wound around the display surface 64b of the panel glass portion 64. A transparent conductive film 65 corresponding to a conductive film is attached.

The transparent conductive film 65 is formed with a drawer portion 65a extending to the panel outer surface 64a around which the conductive adhesive tape 63 is wound. The drawer portion 65a is pressed against the panel outer surface 64a. Conductive adhesive tape 6
Wrap 3 Thereby, the explosion-proof band 62 and the transparent conductive film 65 are electrically connected via the conductive adhesive tape 63, and the transparent conductive film 65 can be grounded.

[0011]

As described above, in the conventional cathode ray tube, in order to ground the panel display surface, the metal conductive tape 57 (FIG. 7) is attached and the electrode 58 (FIG. 10) by soldering or the like is used. ) Is required,
There is a problem that the manufacturing cost increases due to the use of these special conductive tapes 57 and the addition of a special manufacturing process for forming electrodes.

Further, in the other conventional example, as is clear from FIG. 12, the transparent conductive film 65 must be attached before the explosion-proof band 62 is attached, which causes a problem in workability or safety. there were. Further, when the four sides of the display surface 64b of the panel glass portion 64 are arcuate in the tube axis direction (see FIG. 11), the drawer portion 65a is formed.
Therefore, there is a risk that the electrical connection may be cut off in the middle of the process, which may cause a defective electrical connection.

The object of the present invention is to solve the above problems,
Another object of the present invention is to provide an antistatic Braun tube which has excellent workability, safety, and operational stability, and further minimizes an increase in manufacturing cost.

[0014]

According to a first aspect of the present invention, there is provided an antistatic cathode ray tube, wherein an explosion-proof band is mounted on a panel outer surface of a panel glass portion of a glass bulb with a layer of conductive adhesive tape as a base, and the panel glass is attached. In an antistatic Braun tube in which a conductive film is attached to the display surface of a part, the conductive film forms a base material having a predetermined rigidity and a layer having conductivity and adhesiveness on one side of the base material. The one side is attached so as to face the display surface.

The antistatic Braun tube according to a second aspect is the antistatic Braun tube according to the first aspect, wherein the side end portion of the conductive adhesive tape hangs over a part or all of the outer peripheral portion of the display surface. The conductive layer of the conductive film is formed in contact with the side end portion so as to be electrically conductive. The antistatic Braun tube according to claim 3 is the antistatic Braun tube according to claim 2, wherein the conductive film is formed into a substantially rectangular shape and is joined to the side end at the center of the long side or the short side. It is characterized in that a convex portion is formed.

The antistatic cathode ray tube according to claim 4 is the antistatic cathode ray tube according to claim 2, wherein the layer formed on one side of the base material is separated into a conductive layer and an adhesive layer. It is characterized by being formed.
Further, an antistatic CRT according to a fifth aspect is the antistatic CRT according to the second aspect, characterized in that the display surface is formed in a planar shape or a cylindrical side surface shape.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a front view showing a main part configuration of an antistatic CRT according to a first embodiment of the present invention as viewed from the front side of the screen, and FIG. 2 is a cross section including an instruction line 101 in FIG. FIG.

The antistatic cathode ray tube 1 shown in FIG. 1 is mainly different from the aforementioned cathode ray tube 50 shown in FIG. 7 in that the antistatic film 2 corresponding to the conductive film and the conductive adhesive are used. Since only the tape 3 is used, common parts are given the same reference numerals, detailed description thereof is omitted, and different parts are mainly described. The display surface of the cathode ray tube 1, that is, the display surface 51 of the panel glass portion 51.
b is formed in a substantially flat shape.

A panel outer surface 51a of the panel glass portion 51
A metal explosion-proof band 55 for tightening the peripheral surface of the cathode-ray tube 1 in order to prevent the implosion of the cathode-ray tube 1 is provided via a conductive adhesive tape 3 as a base layer thereof. As shown in FIG. 2, the conductive adhesive tape 3 has elasticity, covers the panel outer surface 51a to the panel round portion 51c, and further has its side end 3a on the outer periphery of the flat display surface 51b. It is wrapped so that it hangs.

The width of the side end portion 3a of the conductive adhesive tape 3 which hangs on the flat display surface 51b is determined by the cathode ray tube 1.
The range is set so that it does not protrude from the front bezel when the is installed in the monitor case.

As shown in FIG. 1, the antistatic film 2 is attached so as to cover the display surface 51b of the panel glass portion 51, although the outer peripheral portion of the display surface 51b is slightly left. In addition, the antistatic film 2 has 51
Convex portions 2a and 2b are formed in the middle portions of the respective long sides corresponding to the upper and lower sides of b, and these convex portions 2a and 2b overlap with the side end portions 3a of the conductive adhesive tape 3 that hangs on the outer peripheral portion of the display surface 51b. Then, it is affixed so that it adheres to it.

The cross-sectional view of FIG. 5 shows this antistatic film 2
The laminated structure of is shown. Acrylic, glass, or P
A conductive adhesive layer 2d having conductivity is formed on one side of the base material 2c made of an insulator such as ET, which is in contact with the display surface 51b of the panel glass portion 51 (FIG. 2).

Therefore, as described above, the antistatic film 2 is attached to the display surface 51b of the panel glass portion 51, and the convex portions 2a and 2b thereof are closely attached to the side end portions 3a of the conductive adhesive tape 3. Then, the explosion-proof band 55 and the antistatic film 2 are electrically communicated with each other via the conductive adhesive tape 3. As a result, the explosion-proof band 55 is grounded by means not shown, so that the antistatic film 2 is also grounded at the same time.

As described above, according to the antistatic Braun tube of the first embodiment, the manufacturing cost can be suppressed with a simple structure without attaching a metal conducting tape or forming an electrode with solder or the like. In addition, the antistatic film 2 can be reliably grounded. Further, since it is not necessary to bend the antistatic film 2, there is no possibility that the bent portion is distorted and causes a defect. Furthermore, it becomes possible to attach a conductive film after mounting the explosion-proof band, which is advantageous in terms of workability and safety.

Embodiment 2. FIG. 3 is a front view showing a configuration of a main part of an antistatic CRT according to a second embodiment of the present invention as viewed from the front side of the screen, and FIG. 4 is a cross section including an instruction line 102 in FIG. FIG.

The antistatic cathode ray tube 10 shown in FIG. 3 is mainly different from the cathode ray tube 1 shown in FIG. 1 in that the panel glass portion 1 of the cathode ray tube 10 is different.
1 has a cylindrical side surface with a large radius, and the convex portions 12b, 12 of the antistatic film 12
Since c is formed only in the middle part of each short side corresponding to the left and right sides of the display surface 11b, common parts are denoted by the same reference numerals, detailed description thereof will be omitted, and different parts will be emphasized. To explain.

When the display surface 11b has a cylindrical side surface shape with a large radius (the assumed axis of the cylinder corresponds to the vertical direction in FIG. 3) as in the present embodiment, the conductive adhesive tape 3 is
Even if the side end portion 3a is wrapped around the display surface 11b, it is difficult to make the width of the outer peripheral portion of the display surface 11b uniform over the entire circumference. It becomes smaller on the side.

Therefore, in the antistatic film 12 of the present embodiment, the convex portions 12a and 12b are formed in the middle portions of the respective short sides corresponding to the left and right sides of the display surface 11b.
The a and 12b overlap the side ends 3a of the conductive pressure-sensitive adhesive tape 3 that hang on the outer peripheral portions of the left and right short sides of the display surface 11b, and are attached so as to be in close contact therewith.

Therefore, as described above, the antistatic film 12 is attached to the display surface 11b of the panel glass portion 11, and the projections 12a and 12b are formed on the conductive adhesive tape 3.
At the stage where the explosion-proof band 55 and the antistatic film 12 are in close contact with each other on the side end portion 3a of the above, they are electrically communicated with each other via the conductive adhesive tape 3. As a result, the explosion-proof band 55 is grounded by means not shown, so that the antistatic film 2 is also grounded at the same time.

As described above, according to the antistatic cathode ray tube of the second embodiment, the same effect as that of the first embodiment can be obtained, and even if the display surface of the cathode ray tube has a cylindrical side surface shape, it can be surely performed. The antistatic film 12 can be grounded.

Embodiment 3. The sectional view of FIG. 6 shows the laminated structure of the third embodiment of the antistatic film corresponding to the conductive film used in the antistatic CRT according to the present invention. The antistatic film 15 shown in the figure is formed in the same shape as the antistatic film 2 in the first embodiment or the antistatic film 12 in the second embodiment, and is attached to the display surface of the panel glass portion. However, the laminated structure is different from each of the antistatic films described above.

That is, the conductive layer 15b and the adhesive layer 15c are separate layers on one side of the base material 15a made of an insulating material such as acrylic, glass, or PET that is in contact with the display surface of the panel glass portion. Is formed in. However, as in the case of the first embodiment, at the stage where the antistatic film 15 is adhered onto the side end portion 3a of the conductive adhesive tape 3 (FIG. 2),
Conductive adhesive tape 3 and conductive layer 1 of antistatic film 15
The adhesive layer 15c is formed to be appropriately thin so that the adhesive layer 15c electrically communicates with 5b.

As described above, according to the antistatic film 15 of the third embodiment, the same effect as that of the antistatic film adopted in the first or second embodiment can be obtained.

In each of the above-described embodiments, when the display surface of the panel glass portion is flat, convex portions are formed on the upper and lower long side portions of the antistatic film, and the display surface of the panel glass portion is a cylindrical side surface. In the case of the shape, the convex portions were formed on the left and right short side portions of the antistatic film, but the invention is not limited to this, and the side edge portion of the conductive adhesive tape is appropriately applied to the outer peripheral portion of the display surface. It can be formed anywhere as long as it is
Further, the number thereof is not limited to two as in each embodiment, and various modes can be adopted.

Further, in the above description of the embodiments, the terms "upper", "lower", "left" and "right" are used, but these are for the sake of convenience, and are absolute when the cathode ray tube is arranged. The physical relationship is not limited.

[0036]

According to the antistatic Braun tube according to the first and fourth aspects of the present invention, the electric conduction between the two can be secured by simply sticking the conductive film on the conductive adhesive tape.
Since there is no need for a step of attaching a metal conductive tape and forming an electrode by soldering or the like, it is possible to suppress the manufacturing cost for preventing electrification. Furthermore, it becomes possible to attach a conductive film after attaching the explosion-proof band,
It is advantageous in terms of workability and safety.

According to the antistatic Braun tube according to the second or third aspect, in addition to the effect of the first aspect, conduction with the conductive adhesive tape can be achieved without bending the conductive film, so that the bending portion is distorted. It is possible to prevent defectiveness.

According to the antistatic Braun tube of claim 5, in addition to the effect of claim 1, the conductive film can be attached to the display surface without causing distortion.
The reliability of antistatic due to grounding can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a configuration of a main part of an antistatic CRT according to a first embodiment of the present invention, as viewed from a front direction of a screen.

FIG. 2 is a partial cross-sectional view of a cross section including an instruction line 101 in FIG. 1 viewed from a direction of an arrow B.

FIG. 3 is a front view showing a main part configuration of an antistatic Braun tube according to a second embodiment of the present invention, as viewed from the front direction of the screen.

FIG. 4 is a partial cross-sectional view of a cross section including an instruction line 102 in FIG. 3 as viewed in the direction of arrow C.

FIG. 5 is a cross-sectional view showing a laminated structure of an antistatic film 2 according to the present invention.

FIG. 6 is a cross-sectional view showing another laminated structure of the antistatic film according to the present invention.

FIG. 7 is an external perspective view showing a main part configuration of a conventional cathode ray tube.

FIG. 8 is a cross-sectional view showing a general laminated structure of a conventional conductive film.

9 is a cross-sectional view including an indicator line 100 shown in FIG.
It is a fragmentary sectional view seen from the A direction.

FIG. 10 is a partial cross-sectional view showing an example in which an electrode 58 made of a conductive paste or solder is provided on the conductive layer 51c.

FIG. 11 is an external perspective view of a Braun tube 61 showing a method disclosed in Japanese Patent Laid-Open No. 63-43246 as a conventional example.

FIG. 12 is a cross-sectional view of a main part of a cathode ray tube 61.

[Explanation of symbols]

1 cathode ray tube, 2 antistatic film, 2a, 2
b convex part, 2c base material, 2d conductive adhesive layer, 3
Conductive adhesive tape, 3a side end portion, 10 cathode ray tube, 11 panel glass portion, 11a panel outer surface, 11b display surface, 11c panel round portion,
12 antistatic film, 12a, 12b convex portion,
12c base material, 12d conductive adhesive layer, 15 antistatic film, 15a base material, 15b film conductive layer, 15c film adhesive layer, 50 cathode ray tube, 51 panel glass part, 51a panel outer surface, 51b display surface, 51c panel Round part,
52 funnel part, 53 neck part, 54 explosion-proof tape, 55 explosion-proof band, 56 conductive film, 56a adhesive layer, 56b base material, 56c conductive layer, 57 conductive tape, 58 electrode.

Claims (5)

[Claims] 1. An antistatic device in which an explosion-proof band is attached to the outer surface of the panel glass portion of a glass bulb with a layer of conductive adhesive tape as a base, and a conductive film is attached to the display surface of the panel glass portion. In a cathode ray tube, the conductive film forms a base material having a predetermined rigidity and a layer having conductivity and adhesiveness on one side of the base material so that the one side faces the display surface. An antistatic cathode ray tube characterized by being attached to. 2. A side edge of the conductive adhesive tape is formed so as to hang over a part or all of an outer peripheral portion of the display surface, and a conductive layer of the conductive film is formed at the side edge. The antistatic cathode ray tube according to claim 1, wherein the antistatic cathode ray tube is formed so as to be in contact with and electrically conductive. 3. The charging according to claim 2, wherein the conductive film is formed in a substantially rectangular shape, and a convex portion that is joined to the side end portion is formed at a central portion of a long side or a short side. Prevent cathode ray tube. 4. The layer produced on one side of the substrate comprises:
The antistatic cathode ray tube according to claim 2, wherein the antistatic Braun tube is formed so as to be separated into a conductive layer and an adhesive layer. 5. The antistatic cathode ray tube according to claim 2, wherein the display surface is formed in a planar shape or a cylindrical side surface shape.