JPH081792B2 - CRT - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cathode ray tube, and more particularly to a conductive structure between a conductive thin film deposited on the surface of a cathode ray tube and a tension band.

[Conventional technology]

Conventionally, the panel surface of a cathode ray tube is charged with static electricity, and when a person comes into contact with the surface of the cathode ray tube, it is discharged, which causes discomfort to the person. In order to eliminate this drawback, a cathode ray tube in which a transparent or semitransparent film having conductivity is attached to the panel surface has been proposed.

[Problems to be solved by the invention]

The cathode ray tube with a conductive transparent or semi-transparent film coated on the panel surface described above has no antistatic effect unless the conductive film is reliably set to the ground potential, but the panel surface is not flat and has a complicated curvature. It is a spherical surface and the conductive film is transparent or semi-transparent so that it becomes a thin film and has no mechanical strength. Therefore, it was difficult to keep this conductive thin film at a stable ground potential for a long period of time.

[Means for solving problems]

The cathode ray tube of the present invention comprises a conductive adhesive tape having conductivity on both sides, which is wound around an outer surface of a panel, and a tension band is attached to the tape. And the conductive adhesive tape are in contact with each other, so that the electric potential of the panel surface can be surely maintained at the earth potential via the tension band and the lug attached to the tension band.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention. In the figure, a tension band 4 is wound around the outer surface of the panel 2 of the bulb 1 with an adhesive tape 3 having conductivity as the underlay. In the conductive adhesive tape 3, both the adhesive and the tape material have conductivity, and the conductive adhesive tape 3 is pressed onto the lead-out portion 5'of the transparent or semitransparent conductive film attached to the surface of the panel 2.

FIG. 2 is an enlarged cross-sectional view for explaining the embodiment of the present invention. The transparent or semitransparent conductive film 5 adhered to the surface of the panel 2 comes into contact with the conductive adhesive tape 3 at its lead-out portion 5'and conducts with the tension band 4 so that the same potential can be obtained.

In the above embodiment, the case where the transparent or semi-transparent conductive film is provided on the side surface of the panel has been described, but it may be provided at the corner of the panel, or the drawn portion 5'is opaque. It may be made of another material such as a conductive film.

Conductive adhesive tape 3 used in the cathode ray tube of the present invention
Since it prevents the surface of the panel from being charged, its electrical conductivity does not need to be particularly good, and it is composed of a conductive adhesive and a plastic tape having a resistance value of several tens MΩ or less.

〔The invention's effect〕

As described above, the cathode ray tube of the present invention is configured such that the adhesive tape to be attached under the tension band is made of a material having conductivity on both sides and has electrical continuity with the transparent or semitransparent conductive film adhered to the panel surface. As a result, electrical connection between the conductive film on the panel surface and the tension band can be performed easily and reliably, so that the panel surface potential is kept at the ground potential via the mounting lug attached to the tension band. Therefore, there is an effect of preventing electrification of the panel surface which gives a discomfort to a person.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing the constitution of the present invention. 1 ... Valve, 2 ... Panel, 3 ... Conductive adhesive tape, 4 ... Tension band, 5 ... Transparent conductive film, 5 '
...... Drawout part of the transparent conductive film.

Claims (1)

[Claims] 1. A Braun tube in which an adhesive tape having an adhesive on one surface is wound around an outer surface of a panel to be adhered, and a tension band is mounted on the adhesive tape, wherein the adhesive tape has conductivity on both sides and a panel surface. A cathode ray tube, which is pressure-contacted onto a lead-out portion of a transparent or semitransparent conductive film adhered to, and is electrically connected to the tension band by being electrically connected to the tension band.