JPH0824035B2 - Cathode ray tube - Google Patents

Description

The present invention relates to a cathode ray tube (hereinafter referred to as a cathode ray tube).

[Background of the Invention]

In order to ground the outer conductive film of the funnel portion of the cathode ray tube, conventionally, the ground wire is brought into line contact with the outer conductive film of the cathode ray tube under tension. However, if this method is applied to a face that has been subjected to a conductive surface treatment, it is difficult to apply tension to the ground wire only in the peripheral portion of the face and make it run around. It is also possible to attach a ground wire or a metal mesh around the inner opening of the bezel and attach the cathode ray tube to the bezel so that the mesh attached to the inner surface of the bezel and the surface treatment film of the cathode ray tube face are in contact with each other. Has the drawback that the structure is complicated. Further, as disclosed in Japanese Utility Model Application Laid-Open No. 59-21557, a structure has been proposed in which an external conductive film and a reinforcing structure are connected by a metal spray layer.

[Object of the Invention] An object of the present invention is to provide a structure of a cathode ray tube in which the face potential of the cathode ray tube is equal to the ground potential.

[Outline of Invention]

The external graphite film of the funnel portion was used as the external conductive film of the cathode ray tube. Recently, a cathode ray tube coated with a transparent conductive film for the purpose of preventing static electricity on the face surface, or spray-coated silica oxide for the purpose of non-glare, and then fired to perform non-glare treatment and at the same time make the coating film conductive. Therefore, cathode ray tubes that can be used for antistatic have also appeared. In order to prevent static electricity by utilizing the conductivity of these surface-treated films, the surface conductive film should be at ground potential,
It must be electrically connected to these conductive films. What could be used as an electrical terminal in a cathode ray tube would be either a stiffening band or a mounting lug. Therefore, the present invention provides a cathode ray tube in which a structure in which conductivity is imparted to the surface of a face plate is electrically connected to a reinforcing means.

Example of Invention

An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 is a panel forming a part of the envelope, and 2 is a silica coat film coated for non-glare, which extends not only to the surface of the face plate 1a but also to the panel skirt portion 1b. 3 is the width of the face plate 1a in the outer peripheral direction.
This is an aluminum tape of 20 to 30 mm, and the length along the height direction of the panel skirt portion 1b is extended until it exceeds at least one end of the reinforcing tape 4 in the width direction. Then, when taping the reinforcing tape 4 in the outer peripheral direction of the face plate 1 a, the aluminum tape 3 is inserted between the silica coat film 2 and the reinforcing tape 4. After taping of the reinforcing tape 4 is completed, the aluminum tape 3 is folded back and the reinforcing tape 4 is sandwiched. Then, the tension band 5 for reinforcement is attached. It should be noted that if the aluminum tape 3 is coated with an adhesive on one side, the workability is good, and if the adhesive surface is on the side of the reinforcing tape 4, the aluminum tape 3 does not rise and the work is easy when the reinforcing band 5 is attached. become.

The operation of this embodiment will be described. When a power source (not shown) is turned on, the electric potential of the inner surface 6 of the panel 1 becomes a high electric potential of 20 to 30 kV which is almost the same as the anode voltage. As a result, charges are electrostatically induced on the face plate surface 1a, and the potential thereof becomes substantially the same value as the anode voltage. If the reinforcing band 5 is set to the ground potential, the electric charge induced on the surface of the face plate moves from the surface coating film 2 to the aluminum tape 3 and further to the reinforcing band 5, causing discharge on the surface of the face plate, and the potential is It becomes earth potential and can prevent electrostatic charge. According to this embodiment, if only the reinforcing band is grounded, the antistatic effect can be obtained without grounding the panel surface by the special method as described above.

Next, FIG. 2 shows another embodiment of the present invention. The same parts as those in FIG. Second
In the figure, the conductive film 12 is cut in the middle of the panel skirt portion 1b, and instead, a conductive film 17 made of graphite or the like is applied to bring it into contact with the aluminum tape 3 to obtain electrical conduction. With this structure, a conductive film made of graphite or the like
17 has an effect that it can be formed at the same time when an external conductive film (not shown) is formed.

Further, in the figure, even if the aluminum tape 3 is extended along the height direction of the panel skirt portion 1b to the conductive film 12 without applying the conductive film 17, the aluminum tape 3 and the conductive film 12 may be brought into contact with each other. Good.

Further, in the figure, the aluminum tape 3 is not folded back and sandwiched by the reinforcing tape 4, and the aluminum tape 3 is passed from the outer peripheral portion of the reinforcing tension band 5 over the widthwise end portion of the reinforcing tape 4 to the conductive film 12. The same effect as that of the above-described embodiment can be obtained even if the configuration is such that electrical conduction is obtained by contacting with.

Further, in order to ground the reinforcing band, it is easy to provide a ground hole in the reinforcing band. If the reinforcing band and the mounting lug are integrated by welding or the like, a grounding hole may be formed in the mounting lug. Of course, the conductive films 2 and 12 may be conductive tapes.

〔The invention's effect〕

According to the present invention, since it is possible to electrically connect the reinforcing band to the one having the conductive structure on the face plate surface, (1) the antistatic function and (2) the special surface treatment film having the dustproof function. It can be obtained by the conventional grounding method without requiring any grounding method.

[Brief description of drawings]

FIG. 1 is a sectional view of the essential parts showing an embodiment of the present invention, and FIG. 2 is a sectional view of the essential parts showing another embodiment of the present invention. 1 ... panel, 1a ... face plate, 1b ... skirt part, 2,12 ... conductive film, 3 ... aluminum tape, 4 ...
Reinforcing tape, 5 …… Reinforcing tension band, 17 ……
Dielectric film.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-51-93865 (JP, A) Jikkoku 50-29410 (JP, Y1) Jpn. Microfilm (JP, U), which is a photograph of the details and drawings attached to the application

Claims (1)

[Claims] 1. An explosion-proof structure in which a panel has a structure having conductivity from a surface of a face plate to a side wall, an insulating reinforcing tape is wound around the side wall of the panel, and a reinforcing tension band is attached to the outside thereof. The peripheral portion or side wall of the face plate surface of the conductive panel and the reinforcing tension band are formed in the height direction of the panel side wall by a metal adhesive tape having an arbitrary width in the outer peripheral direction of the face plate. A cathode ray tube characterized in that it is electrically connected along at least one end of the reinforcing tape.