JPH0662353A - Cathode-ray tube - Google Patents

Abstract

PURPOSE: To provide a cathode-ray tube(CRT) capable of preventing static electricity from being generated on a protection panel. CONSTITUTION: This CRT is provided with a vacuum sealed body 1 having a transparent front panel 2, transparent protection panel 3 installed outside the front panel 2 at an interval from the front panel 2, one conductor 4 at least fixed in the edge area of protection panel 3, and conductive linking means 5 for linking the conductor 4 to the ground. Thus, since static electricity is collected and discharged from the protection panel 3 installed on the front panel 2 in simple structure, problems caused by static electricity can be inexpensively and effectively prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a vacuum sealing body having a transparent front plate, and a transparent protective panel, that is, a sun screen, which is grounded to the outside of the front plate at a distance from the front plate.
The present invention relates to a cathode ray tube having a (Sun Screen), and particularly to a cathode ray tube in which static electricity is prevented from being generated in a protective panel.

[0002]

2. Description of the Related Art In a cathode ray tube used in a conventional image display device, a high voltage of several tens of KV is applied to the inner surface of a face plate during operation, so that the front plate is charged and is in operation. Not only that, the front plate has high static electricity for a certain period of time after the operation is stopped. In particular, when a protective panel made of transparent tempered glass that shields the front plate of the cathode ray tube to protect it from external forces, so to speak, when a sun screen is used, static electricity generated on the front plate has no discharge path, so the cathode ray tube The space between the front plate and the protection panel is charged.

[0003] Such an electric charge attracts and attaches the surrounding dust, and when a person comes into contact with the person, an electric shock is given to the person to cause discomfort, and in some cases, for example, a pregnant woman or a child is fatal. Therefore, various methods have been proposed to prevent this occurrence. For example, a conductive adhesive is applied between the front panel of the cathode ray tube and the protective panel, and then the accumulated charge is collected.
Some of them are discharged to the ground side, or the front plate is treated with a special coating to prevent static electricity.

[0004]

However, such a conventional method has a drawback in that the structure is complicated or the cost is high. Therefore, an object of the present invention is to provide a cathode ray tube capable of effectively preventing static electricity of a protective panel with a simple and inexpensive structure.

[0005]

In order to achieve the above-mentioned object, a cathode ray tube according to the present invention is attached to a vacuum seal having a transparent front plate and an outer side of the front plate at a distance from the front plate. A transparent protective panel, at least one conductor fixed to an edge region of the protective panel, and conductive connecting means for connecting the conductor to ground. here,
As the conductor, a metal bracket for fixing the protective panel may be used, or a conductive adhesive tape attached separately may be used.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic side view of a cathode ray tube of this embodiment used in a video display device such as a TV. The transparent front plate 2 of the cathode ray tube 1 made of a vacuum sealed body is provided with a protective panel 3 (transparent reinforce) made of transparent tempered glass to protect the front plate 2 from external force.
A dglass protective panel) is installed at a fixed distance from the front plate 2. This protective panel 3 is generally fixed to a housing of a TV or the like (not shown), and in some cases, fixed to the cathode ray tube 1 by being bonded to the front plate 2 of the cathode ray tube 1.

As can be seen from FIG. 2 which is a rear view of the protective panel 3, four conductors 4 are attached to their insulating regions, and a ground wire 5 is attached to each of these conductors 4. It is connected. The ground wire 5 or the like grounds the corresponding conductor 4, for example, a chassis of a TV or the like.
is) or a ground terminal existing in the cathode ray tube PCB, electrically connecting directly or through another ground path. In order to shorten the length of the ground wire 5, it may be connected to an existing ground path surrounding the funnel portion of the cathode ray tube 1 adjacent to the front plate 2 such as a TBC wire or a metal band.

As the conductor 4 attached to the edge region of the protective panel 3, a conductive metal plate piece which can be easily attached by an appropriate attaching means such as a rivet or an adhesive is used. And more preferably a conductive tape that can be easily attached is used. Alternatively, the ground wire 5 may be connected to the existing metal bracket 6 used for fixing the protection panel 3, as shown in FIG. 3, without adding the conductor 4. One end of the bracket 6 is electrically conductively fixed to the edge of the protection panel 3 by a rivet or the like, and the other end is fixed to the chassis or the housing by a screw or the like. Therefore, the aim can be achieved by directly connecting the bracket 6 to a ground terminal such as a chassis or by connecting the bracket 6 through the ground wire 5.

With such a structure, when the cathode ray tube 1 is activated and electrons are emitted from the electron gun, a high voltage of several tens of KW is applied to the front plate 2 of the cathode ray tube 1 for black and white,
In the case of color, a high voltage of 20 KW or more is applied.
As a result, high static electricity is charged between the front panel 1 of the cathode ray tube 1 and the protective panel 3 installed with a space.
The static electricity is collected by a large number of conductors 4 provided on the protection panel 3, and the collected static electricity is discharged to the ground side through a ground wire 5. Therefore, the static electricity charged between the front plate 2 of the cathode ray tube 1 and the protective panel 3 is effectively discharged.

[0010]

As described above, according to the cathode ray tube of the present invention, there is a problem that static electricity can be generated by collecting and discharging static electricity from the protection panel installed on the front plate with a simple structure. It is cheap and can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a schematic side view of a cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a rear view of a protection panel.

FIG. 3 is a schematic side view of a cathode ray tube according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Cathode ray tube, 2 ... Front plate, 3 ... Protective panel, 4 ... Conductor, 5 ... Ground wire, 6 ... Bracket

Claims (3)

[Claims] 1. A vacuum sealer having a transparent front plate, a transparent protection panel installed outside the front plate at a distance from the front plate, and at least one fixed to an edge region of the protection panel. A cathode ray tube comprising: one conductor; and conductive connecting means for connecting the conductor to an installation. 2. The cathode ray tube according to claim 1, wherein the conductor comprises a bracket for protecting the protection panel. 3. The cathode ray tube according to claim 1, wherein the conductor is a conductive adhesive tape.