JPH0215538A - Cathode ray tube - Google Patents

Abstract

PURPOSE:To have the electro static charge leaked instantaneously so as not to have the effect of the air-conditioning humidity by earthing the conductive panel surface coated with a transparent conductive film through a metal reinforcing body for preventing the implosion of a valve. CONSTITUTION:A transparent conductive film 1, a glass panel 2, a fluorescent surface 3, a metal reinforcing body 4, an adhesive glass tape (insulating member) 5, a metal piece with a protrusion 6 and a cathode ray tube main body 7 are provided. The metal piece with a protrusion 6 is disposed at the periphery of a panel skirt 2a with the tip of the protrusion faced outward (the opposite side from the skirt), its outside is wound with the adhesive tape, and further fastened tightly by means of a metal reinforcing body 4. In this case, the protrusion 6a of the metal piece 6 breaks through the adhesive tape 5 so that the tip of the protrusion 6a reaches the internal surface of the metal reinforcing body 4 outside the adhesivetape 5 and the transparent conductive film 1 on the glass surface, that is, the front surface of the panel 2 is electrically connected with the metal reinforcing body 4. The charge of the panel surface is leaked in extremely short time even under low humidity almost without being influenced by air conditioning humidity so as to prevent various adverse effects.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention leaks high-voltage charges on the panel surface to the ground potential of a device equipped with a cathode ray tube by extremely simple means, thereby reducing static electricity. This invention relates to cathode ray tubes that prevent malfunctions of cathode ray tubes and peripheral equipment and adverse effects on the human body.

[Prior Art] In a cathode ray tube, a high anode voltage is applied to the fluorescent surface (metal back film) in order to cause the electron beam to scan the fluorescent surface on the back of the panel of the bulb. is also charged to a high voltage and charges are accumulated. Such a charge is
Since this can cause cathode ray tubes and peripheral equipment to malfunction, and can give electric shock to the human body, various countermeasures have been proposed and implemented in the past. Various methods have been proposed for making the panel surface conductive, and various conduction methods have been proposed for grounding and dissipating the charge on the conductive portion. For example, Japanese Utility Model Application Publication No. 62-131356 discloses a method in which a contact wire is brought into contact with a reinforcing metal fitting at ground potential, and Japanese Utility Model Application Publication No. 62-116436 discloses a method in which an ultra-thin conducting wire is brought into contact with exterior graphite. Publication No. 149155/1983 describes a method of grounding using conductive rubber, which
149770 discloses a method using a conductive resin, and JP-A-62-154540 discloses a method using a contactor. However, all of these methods are incomplete and lack reliable conduction and lifetime reliability. Special request 1976
No. 2-63862 describes a method in which conductive liquid is soaked into the adhesive tape between the earth potential reinforcing metal fittings and the panel skirt, and although this method has considerably improved reliability, However, there are still changes in the quality of the liquid, reactions with adhesive materials, etc.

It cannot be said that the reliability of life is certain.

[Problem to be solved by the invention] The above-mentioned Utility Model Application No. 62-131356, Utility Model Application No. 62-116
No. 436, Utility Model Publication No. 149155, 1982, and Japanese Patent Application Publication No. 1983-
The techniques disclosed in Japanese Patent Application Laid-open No. 149770 and Japanese Patent Application Laid-Open No. 62-154540 only briefly describe the grounding of the panel surface, but do not discuss specific details.

According to the inventor's experiments, when the panel surface and the metal reinforcement are insulated, the air conditioning humidity during cathode ray tube operation is 40%.
Below RH, it is necessary to lower the surface resistivity to 1 x 1010 Ω or less, and at humidity below 20% RH, even if the surface resistivity is reduced to 1 x 10 7 Ω or less, unless the charge is grounded, it will not prevent charging much. No effect is obtained. On the other hand, when the panel surface is electrically connected to a metal reinforcing body at ground potential, it has been found that there is a sufficient antistatic effect even if the humidity is below 20% RH and the surface resistivity is below lXl0''Ω. There is.

The present invention provides a concrete means for simply and reliably grounding the surface of a conductive panel coated with a transparent conductive film through a metal reinforcement for preventing implosion of a bulb.

It is an object of the present invention to provide an IF anti-electrostatic pole ray tube that instantly leaks electrical charges and is not affected by air conditioning humidity.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a transparent conductive film coated on the outer surface of the glass from the outer front surface of the bulb panel to the skirt portion, and Insulating materials (for example, adhesive tapes made of glass fibers, which are more easily plastically deformed than hard metal surfaces or glass surfaces, and which are interposed between these two types of surfaces and are relatively uniform and low per unit area over a wide area) between the transparent conductive film surface on the outer peripheral surface of the panel skirt portion and the insulating member.

A metal piece having a protrusion is inserted into the insulating member side, and the tip of the protrusion breaks through the insulating member and reaches the inner surface of the metal reinforcing member by the pressure of the metal reinforcing member tightening from the outside of the insulating member. Therefore, it was decided to electrically connect the metal reinforcing body to the transparent conductive film that was applied to the outer surface of the glass from the outer front surface of the panel to the skirt portion through the metal piece. The metal reinforcement holds the panel skirt firmly in place, so in almost all equipment using cathode ray tubes, the metal fittings are now attached to the metal reinforcement. are doing. In this installation, the fittings were welded to the metal reinforcement. or strongly crimped, and the two are electrically connected. Therefore, this installation only requires that the metal fittings be connected to the ground potential section or so-called chassis of the device using the cathode ray tube.

That is, with such a structure, the conductive front glass surface is at ground potential, and the high-voltage static electricity induced when the cathode ray tube is turned on and off is instantly erased.

It should be noted that the metal pieces need not be inserted continuously over the entire circumference of the panel skirt, but can be inserted partially, for example, in lengths of several square meters to several tens of square meters, at a total of eight locations, two on each of the long and short sides. It's okay to do as much as you want.

Further, the transparent conductive film may be formed before attaching the metal piece, glass adhesive tape, metal reinforcement, etc., or conversely, the transparent conductive film may be formed after the metal piece, adhesive tape, metal reinforcement, etc. After the main body has been completed and the metal pieces, adhesive tape, and metal reinforcing body have been attached, a transparent conductive film may be formed by spin coating, dip coating, or the like. in this case,
The transparent conductive film liquid must be reliably applied onto the metal piece to form a conductive film.

[Operation] The transparent conductive film on the surface of the panel front glass of the covalve can be easily and reliably electrically connected to the metal reinforcing body through a metal piece with protrusions on the adhesive tape side attached to the outer periphery of the panel skirt. The conductive film on the surface can be grounded to the chassis of the device using the cathode ray tube through the metal reinforcement, and the electrical charges on the front glass surface can be leaked to the chassis of the device in an extremely short time regardless of the air conditioning humidity. This can prevent cathode ray tubes and peripheral equipment from malfunctioning and adverse effects on the human body, such as electric shock, due to static electricity charging on the panel surface.

[Example] FIG. 1(a) is a schematic sectional view of the main part of an example of the present invention,
Figures (b) and (c') are enlarged detailed views of circle A in Figure 1 (a), showing the state before and after tightening with the metal reinforcing body, respectively. Note that illustration of the metal back film, shadow mask, and other components is omitted.

In these figures, 1 is a transparent conductive film, 2 is a glass panel, 2a is a panel skirt, 3 is a fluorescent surface, 4 is a metal reinforcement, 5 is an adhesive glass tape (insulating member), and 6 is a protrusion according to the present invention. The metal piece 7 with the metal piece 7 is the main body of the cathode ray tube. In this example, after the cathode ray tube main body is completed, the panel 2
A transparent conductive film 1 is formed in advance on the glass surface. A metal piece 6 having a protrusion is placed on the outer periphery of the panel skirt 2a with the tip of the protrusion facing outward (the side opposite to the skirt), an adhesive tape 5 is wrapped around the outside of the metal piece 6, and a metal reinforcing body 4 is further wrapped around the outside of the metal piece 6. Tighten firmly. If the adhesive tape 5 is not tightened to the metal reinforcing body 4, it will be in the state shown in FIG.
The result is as shown in Figure (b). That is, when the metal reinforcing body 4 is strongly tightened from the outside of the adhesive tape 5, the protrusion 6a of the metal piece 6 breaks through the adhesive tape 5, and the tip of the protrusion 6a reaches the inner surface of the metal reinforcing body 4 on the outside of the adhesive tape 5. do.

FIG. 3 is a diagram showing a state in which the protrusion 6a of the metal piece 6 has penetrated the adhesive tape 5 and the tip thereof has appeared on the outside (metal reinforcing body side). Note that the metal pieces 6 may be arranged continuously over the entire outer circumference of the panel, but as shown in FIG.
It may be several tens of liters in length and placed in a plurality of locations, for example eight locations. In this way, the transparent conductive film 1 on the glass surface of the front panel of the cathode ray tube is reliably electrically connected to the metal reinforcing body 4.

As described above, after the cathode ray tube body 7 is completed, the metal piece 6, the adhesive tape 5, and the metal reinforcing body 4 may be attached first, and then the transparent conductive film 1 may be formed. Figure 2 (a
) is a diagram showing the state in which the outside of the adhesive tape 5 is not tightened by the metal reinforcing body 4, and FIG.
), the metal reinforcing body 4 tightens the adhesive tape 5, and the metal piece 6
6 is a diagram showing a state in which the protrusion 6a has penetrated the adhesive tape 5 and the tip of the protrusion 6a has reached the inner surface of the metal reinforcing body 4. FIG.

After reaching the state shown in FIG. 2(b), from the outside front of panel 2 to the skirt 2a (if
If the transparent conductive DI 1 is formed only on the outer front surface of the panel, then apply the transparent conductive film liquid 8 by spin coating, dip coating, or brush coating. , to form a transparent conductive film 1 by heating. In this case, when applying the transparent conductive film liquid 8, the liquid must reliably wet the metal piece 6, as shown in FIG. 2(c).

In either embodiment, the final result is shown in FIG. 1(C).

Alternatively, a similar effect can be obtained as shown in FIG. 2(c). In the cathode ray tube configured in this way, the surface resistivity of the transparent conductive film 1 and the metal reinforcing body 4 is 1×10 7 ~
It was 1×10′Ω. The difference in antistatic effect due to the presence or absence of the metal piece 6 is compared in terms of the decay rate of the charged voltage on the surface of the cathode ray tube panel (the time it takes for the voltage on the panel surface to become 2 kV or less after switching on and off at an applied voltage of 23 kV) as follows. It will look like Table 1.

As is clear from this table, when the transparent conductive film 1 and the metal reinforcing body 4 (ground potential) were electrically connected using the metal piece 6 according to the present invention, an IF antistatic effect was obtained even at low humidity.

In addition, although the above embodiment described a color cathode ray tube, the present invention is of course not limited to this, and the metal reinforcement body was also an example of a band reinforcement structure, but other examples such as p- Of course, OP reinforcement or the like may also be used. Of course, the metal pieces may be replaced with various conductive members as long as they comply with the spirit of the present invention.

[Effects of the Invention] As explained above, according to the present invention, the charge on the panel surface can be leaked in a very short time even at low humidity without being affected by air conditioning humidity, and various types of charges caused by the charge on the panel surface can be leaked out in a very short time even at low humidity. can prevent the negative effects of

[Brief explanation of the drawing]

FIG. 1(a) is a schematic cross-sectional view of the main parts of one embodiment of the present invention.
Figure (b) is an enlarged detailed view of circle A in Figure 1 (a), showing the state before tightening with the metal reinforcement, Figure 1 (C) is circle A in Figure 1 (a). The enlarged detailed view in Figure 2 shows the state after tightening with metal reinforcing bodies. Figure 2 (a) is an example in which metal pieces, adhesive tape, and metal reinforcing bodies are attached first, and then a transparent conductive film is formed. Figure 2 (b) shows the state in which the outside of the adhesive tape is not tightened by the metal reinforcing body. Figure 2 (c) is a diagram showing the state in which the tip has reached the side surface of the metal reinforcement body, and when applying the transparent conductive film liquid after reaching the state shown in Figure 2 (b), the liquid is sure to coat the metal. FIG. 3 shows a state in which the piece is wetted, and FIG. 3 shows a state in which the protrusion of the metal piece has penetrated the adhesive tape and the tip has appeared on the outside (metal reinforcing body side). 1.Transparent conductive film, 2.Panel, 2a.Panel skirt, 4.Metal reinforcement, 5.Adhesive chart (Q)V 2a- C stone stone 2f) - To 8 - Jumonmimi 1W Ritsuko Figure 5 - Merobeko - Fu 6 - N&Note 60 - Ma start

Claims (1)

[Claims] 1. A cathode ray comprising a transparent conductive film coated on the outer surface of the glass from the outside front of the bulb panel to the skirt portion, and a metal reinforcement for implosion prevention that surrounds the outer periphery of the panel skirt portion with an insulating member sandwiched in between. In the pipe, a metal piece having a protrusion on the insulating member side is inserted between the transparent conductive film surface on the outer peripheral surface of the panel skirt portion and the insulating member, and the pressure of the metal reinforcing body tightens from the outside of the insulating member. By breaking and penetrating the insulating member with the tips of the protrusions to reach the inner surface of the metal reinforcing body, the transparent conductive film and the metal reinforcing body, which are adhered to the outer surface of the glass from the outer front surface of the panel to the skirt portion, are removed. A cathode ray tube characterized by electrical connection via a metal piece.