JPH10144239A - CRT explosion proof tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely ground a safety glass surface of a front surface of a cathode-ray tube so as to prevent the charge, and to securely prevent the explosion of the cathode-ray tube, and to facilitate the removal of a metal band at the time of recycle by sewing conductive fibers in an adhesive tape. SOLUTION: Conductive fibers 3 are sewed in a supporting base 1 so as to form a conductive adhesive agent 2, and while an exposed conductive fiber part 31 of the supporting base 1 is made to contact with a metal band 7, and an exposed conductive fiber part 32 of a surface of an adhesive agent 2 is made to contact with a surface of a sealing conductive tape 61. Since the conductive fiber 3 can be safely held without generating a damage thereof in relation to the shrinkage of the metal band 7, the sealing conductive tape 6 and the metal band 7 can be securely electrified with each other. Since a conductive film 52 of a most front surface of a cathode-ray tube 4 is set at a grounding electric potential by grounding the metal band 7, charge can be prevented. With this structure, strong connection of the metal band 7 and a panel part 41 to each other is avoided so that the metal band 7 can be easily removed at the time of recycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT explosion-proof tape which can be grounded to prevent charging of a CRT panel.

[0002]

2. Description of the Related Art CRTs, which are frequently used as picture tubes for televisions, require explosion-proof reinforcement because the inside is evacuated and the material is glass. Therefore, the adhesive tape is wound around the outer periphery of the cathode ray tube panel, the metal band is shrink-fitted with the tape wound layer as a seat, and the moment acting on the front surface of the cathode ray tube for vacuum is applied to the metal band. It is known that a reverse moment generated by shrink fitting is used to alleviate or reduce the reverse moment. It is also known that a safety glass coated with a reflective functional film is bonded to the front surface of a CRT panel portion via an adhesive to prevent reflection.

In a cathode ray tube, a conductive film is deposited on the surface of the safety glass in order to prevent charging (positive charging) on the surface of the safety glass due to an electrostatic induction phenomenon caused by anodic charging. It is known that the metal band is electrically connected to the shrink-fitting metal band, and this metal band is grounded. As such a grounding structure, as shown in FIG. Injection adhesive 5
A conductive adhesive tape is used for the leak preventing tape 6 'for 1', and the panel portion 41 'of the conductive adhesive tape 6' is used.
The adhesive tape A 'made of a synthetic resin is wound around the upper portion 61' of the outer peripheral surface, and the metal band 7 'is shrink-fitted on the wound adhesive tape A' to melt the adhesive tape A '. It is proposed that the metal band 7 'be electrically contacted with the leak-proof conductive adhesive tape portion 61' (JP-A-8-8797).
No. 0).

[0004]

In recent years, cathode ray tubes have been increasingly used as display devices for personal computers, word processors, CAD / CAMs, etc., in addition to television picture tubes. The amount of used goods is also increasing, and it is beneficial to recycle collected products from the market and defective products in the process. In particular, the panel portion is expensive, and the recycling of the panel portion has great economic significance.

[0005] However, in the CRT explosion-proof structure of FIG.
The tape A 'is melted to electrically contact the metal band 7' with the conductive adhesive tape 6 'for preventing leakage.
When the metal band and the outer peripheral surface of the panel portion are firmly bound by the melt-solidification of the glass band A ′, it becomes difficult to detach the metal band 7 ′ upon reuse of the cathode ray tube, and if the metal band 7 ′ is forcibly detached. CRT breakage is inevitable, which hinders the reuse of CRTs.

Further, since the adhesive tape A 'serving as a seat for the metal band 7' is melted during the shrink fitting of the metal band, the metal band is brought into direct contact with the panel portion, especially with the panel portion corner. There is a concern that the panel may be damaged, which is dangerous.

SUMMARY OF THE INVENTION It is an object of the present invention to securely and safely perform grounding for preventing static electricity on the front surface of a cathode ray tube and explosion proof of the cathode ray tube, and easily detach a metal band when recycling the cathode ray tube. To provide a CRT explosion-proof tape.

[0008]

According to a first aspect of the present invention, there is provided a CRT explosion-proof tape having at least the outer periphery of the antistatic surface which is made conductive from the front surface of the panel to the outer periphery of the panel. An adhesive tape used in a CRT explosion-proof structure in which an adhesive tape is wound on a surface portion and a metal band is shrink-fitted on the wound layer, wherein conductive fibers are sewn. It is a configuration to do. The CRT explosion-proof tape according to claim 2 of the present invention is an adhesive tape used in a CRT explosion-proof structure.
A conductive fiber sewn into the supporting base material, and the adhesive is made conductive.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows claim 1 of the present invention.
It is explanatory drawing which shows the CRT explosion-proof tape which concerns on. In FIG. 1, reference numeral 1 denotes a heat-resistant support base material that can withstand a shrink fitting temperature of a metal band described later.
Reference numeral 2 denotes an adhesive applied to one surface of the supporting substrate. Reference numeral 3 denotes a conductive fiber sewn by sewing or the like, a part of which is exposed on the substrate surface 11 and another part is exposed on the adhesive surface 21.

[0010] The shrink fitting temperature of the above metal band (usually 5
As a supporting base material capable of withstanding about 00 ° C., for example, carbonized fibers obtained by firing and carbonizing acrylic fibers (particularly, 200 to 3
A nonwoven fabric having a basis weight of about 70 g of carbonized fiber calcined and carbonized in the air at about 00 ° C. is suitable), glass fiber, quartz fiber, fused silica fiber, ceramic fiber, aramid fiber, and cellulose fiber such as cotton. Cloth or woven fabric can be used. For the pressure-sensitive adhesive 2, for example, high molecular weight polyisobutylene can be used. As the conductive fiber 3, a metal wire having a diameter of several hundred μm, for example, a copper wire of 500 μm can be used.

FIG. 2 is a CRT explosion-proof tape according to the present invention.
The use state of the loop is shown. In FIG. 2, reference numeral 4 denotes a cathode ray tube, which is composed of a panel portion 41 and a funnel portion 42, which are joined with frit glass therebetween, and a front surface of the panel portion is a safety glass 5 bonded through an adhesive 51, and the safety glass 5 A conductive film 52 for antistatic is deposited on the surface. Reference numeral 6 denotes a conductive tape for sealing wound over the peripheral portion of the safety glass 5 and the outer peripheral surface of the panel portion 41. The conductive tape 6 is wound and the adhesive 5
1 was injected and solidified. The vapor-deposited conductive film 52 on the surface of the safety glass and the conductive tape 6 for encapsulation are made conductive from the front surface of the panel portion of the cathode ray tube to the outer peripheral surface of the panel portion to form an antistatic surface. I have. A shows a CRT explosion-proof tape according to the present invention, which is wound around a portion 61 on the outer peripheral surface of the panel of the conductive tape 6 for sealing. 7
Is a metal band, which is shrink-fitted onto the winding layer of the cathode ray tube tape A.

In the CRT explosion-proof tape according to the present invention, the exposed conductive fiber portion 31 on the supporting substrate surface is sealed with the metal band 7 and the exposed conductive fiber portion 32 on the adhesive surface is sealed. The conductive tape 61 is in contact with the surface of the conductive tape 61 by the shrink fitting pressure of the metal band 7 and the conductive fiber (metal wire) 3 can be safely held without damage to the shrink fitting pressure. The conductive tape 6 and the metal band 7 can be reliably electrically connected to each other, and the conductive film 52 on the frontmost surface of the cathode ray tube which is electrically connected to the sealing conductive tape 6 is electrically connected to the metal band 7. The earth potential can be set to an earth potential to prevent charging.

Unlike the conventional example, it is not necessary to melt the cathode-ray tube explosion-proof tape for conduction between the conductive tape for sealing and the metal band. It is possible to avoid a strong binding between the outer peripheral surface and the tape supporting base material by melt-solidification, and it is possible to easily detach the metal band for recycling the CRT without breaking the CRT. it can. In addition, it is possible to use a material that does not melt at the shrink-fitting temperature of the metal band on the support base of the explosion-proof tape, and prevents direct contact of the metal band with the outer peripheral surface of the panel regardless of the shrink-fitting pressure of the metal band. Therefore, the fear of damage on the outer peripheral surface of the panel portion, particularly at the corner, can be eliminated. Of course, based on the pressure acting on the front surface of the panel due to the vacuum in the cathode ray tube, the moment acting on the front surface can be sufficiently canceled out by the moment caused by the shrink fitting pressure of the metal band, and the stress acting on the front surface of the panel portion can be reduced. Mitigation can prevent CRT implosion well.

In the above, the safety glass is omitted, and a conductive film is deposited on the outer peripheral surface of the panel portion from the front surface of the panel portion, and is made conductive from the front surface portion of the panel portion of the cathode ray tube to the outer peripheral surface of the panel portion. It is also possible to wind the explosion-proof tape according to the present invention around the membrane portion and shrink-fit a metal band on the wound layer. FIG. 3 is an explanatory view showing an example of a CRT explosion-proof tape according to claim 2 of the present invention.
In FIG. 3, reference numeral 1 denotes a heat-resistant support substrate, which can withstand the shrink-fitting temperature of the metal band as described above. Reference numeral 3 denotes a conductive fiber sewn on the supporting base material 1 by sewing or the like, and portions 31 and 312 are exposed on both surfaces of the base material 1. Reference numeral 20 denotes a conductive adhesive applied to one surface of the support substrate 1 in which the conductive fibers 3 are sewn, and is made conductive by adding conductive particles or powder, for example, metal particles or carbon particles.

This CRT explosion proof tape is used in the same manner as the CRT explosion proof tape according to the first aspect. In the CRT explosion-proof tape according to the second aspect, the conductive band 31 is formed on the surface of the base material.
The conductive fiber portion 312 on the back surface of the base material is brought into contact with the conductive adhesive 20, and the conductive adhesive 20 is brought into contact with the surface of the conductive tape 61 for sealing to form a conductive material for sealing. Sex
Since the metal band 7 and the metal band 7 are electrically connected to each other, the conductive film 52 on the front surface of the cathode ray tube electrically connected to the conductive tape 6 for sealing is grounded by grounding the metal band 7. -Potential and prevent charging. Of course, regardless of the shrink fitting pressure of the metal band, direct contact of the metal band with the outer peripheral surface of the panel portion can be prevented, so that concern about damage to the outer peripheral surface of the panel portion can be eliminated. The stress acting on the front surface can be sufficiently reduced by the moment of shrink fitting pressure of the metal band, and the implosion of the cathode ray tube can be prevented well.

In the above example of use, the conductive fiber sewn structure in the CRT explosion-proof tape according to claim 1 or the CRT explosion-proof tape according to claim 2 is an explosion-proof tape or support base. Sewing is continuously performed in the thickness direction of the material, if a part of the conductive fiber is exposed on one side and another part of the conductive fiber is exposed on the other side, the sewing direction of the conductive fiber is Not limited. However, the CRT explosion-proof tape according to claim 1 is used.
Or a tape A for explosion-proof cathode ray tube according to claim 2;
As shown in FIG.
The adhesive layer 51 is injected and solidified between the safety glass 5 and the front surface of the panel portion 41 as a means for preventing leakage, and then wound on the outer peripheral surface of the panel portion 41. When the metal band 7 is used by shrink-fitting the metal band 7 on the explosion-proof tape portion a, the sewing direction of the conductive fiber 3 is set to the direction crossing the tape width.

[0017]

The CRT explosion-proof tape according to the present invention has an adhesive tape on at least the outer peripheral surface portion of the antistatic surface made conductive from the front surface of the CRT panel to the outer peripheral surface of the panel portion. And an adhesive tape used when shrink-fitting a metal band on the wound layer,
A conductive fiber that is not broken by shrink fitting pressure, for example, a metal wire is sewn, and the metal wire electrically connects the metal band and the conductive portion on the outer peripheral surface of the panel portion. Can be carried out without melting the adhesive tape, and the grounding of the metal band can prevent the charging of the antistatic surface, so that the strong binding between the metal band and the cathode ray tube panel can be avoided, and the metal band used for recycling the cathode ray tube Can be easily removed without breaking the cathode ray tube. Further, direct contact between the metal band and the outer peripheral surface of the panel portion during shrink fitting of the metal band can be avoided, and shrink fitting of the metal band can be performed safely without fear of damage to the cathode ray tube. Of course, the explosion protection of the cathode ray tube can be performed in the same manner as in the prior art.
Therefore, according to the present invention, both grounding for preventing static electricity on the front surface of the CRT and anti-explosion of the CRT can be performed reliably and safely, and the metal band can be easily detached when using the CRT. An explosion-proof tape for a cathode ray tube can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a CRT explosion-proof tape according to claim 1;

FIG. 2 is an explanatory view showing an example of a use state of the CRT explosion-proof tape according to claim 1;

FIG. 3 is an explanatory view showing an example of a CRT explosion-proof tape according to claim 2;

FIG. 4 is an explanatory diagram showing an example different from the above in use of the CRT explosion-proof tape according to the present invention.

FIG. 5 is an explanatory view showing a conventional CRT explosion-proof structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Support base material 2 Adhesive 20 Conductive adhesive 3 Conductive fiber A CRT explosion-proof tape 4 CRT 41 Panel part a Upper part of panel outer periphery of CRT explosion-proof tape 52 Conductive surface 61 Conductive surface 7 Metal band

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Hiroshi Yamamoto 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (72) Inventor Toshimitsu Okuno 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation

Claims (2)

[Claims] An adhesive tape is wound on at least the outer peripheral surface of the panel portion of the antistatic surface which is made conductive from the front surface of the panel portion of the cathode ray tube to the outer peripheral surface of the panel portion. An adhesive tape used in a CRT explosion-proof structure formed by shrink-fitting, and a conductive fiber sewn into the CRT tape. 2. An adhesive tape is wound on at least the outer peripheral surface portion of the antistatic surface made conductive from the front surface of the panel portion to the outer peripheral surface of the panel portion of the cathode ray tube, and a metal band is formed on the wound layer. An explosion-proof tape for use in a CRT explosion-proof structure, wherein a conductive fiber is sewn into a supporting substrate and the adhesive is made conductive.