JPH05207404A - Cathode ray tube device and cathode ray tube picture display device - Google Patents

Abstract

PURPOSE:To suppress an AC electric field leaked from the cathode ray tube device and a cathode ray tube picture display device. CONSTITUTION:The device is provided with a cathode ray tube 10, a deflector 13 deflecting and scanning an electronic beam emitted from an electron gun (not shown in figure) mounted to an outside of the cathode ray tube 10 and inserted into the inside of a bottle neck 12 of a funnel 11, a reverse voltage application section 14 to obtain a voltage with a reverse polarity to a deflection voltage waveform applied to a deflection coil of the deflector 13, and a couple of compensation electrodes 15 receiving a voltage of a polarity opposite to the deflection voltage waveform by the reverse voltage application section 14 arranged to an upper and a lower part of a panel side wall. Then the compensation electrode 15 is formed to generate an electric field of the opposite polarity to a leakage electric field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device and a cathode ray tube image display device, and more particularly to a cathode ray tube device and a countermeasure against a leakage electric field from the cathode ray tube image display device.

[0002]

2. Description of the Related Art The development of OA (Office Automation) devices has been remarkable in recent years, and OA devices have become familiar in offices and homes. Under such circumstances, a technique of shielding leaked electromagnetic waves and leaked electromagnetic fields is important from the viewpoint of preventing noise of electronic devices and preventing the influence of electromagnetic waves on the human body. Especially in Northern Europe, there are concerns about the influence on the human body, and the allowable values of the AC magnetic field and AC electric field have been shown, and the standard thereof is spreading.

Among OA equipment, a cathode ray tube image display device in which a cathode ray tube device for deflecting and scanning an electron beam emitted from an electron gun by a deflecting device is installed in a cabinet is widely used. As shown in FIG. 18, the cathode ray tube device includes an envelope including a panel 1 and a funnel 2, a phosphor screen 3 formed on the inner surface of the panel 1, and a phosphor screen inserted in a neck 4 of the funnel 2. An electron gun 5 that emits an electron beam that excites and emits 3 and a deflection device 6 that is mounted outside the funnel 2 and that generates a deflection magnetic field that deflects and scans the electron beam. Therefore, it is necessary to shield the leaked electromagnetic waves from this device.

Generally, there are the following types of shielding.
That is, by using a material with low electric resistance, an electrostatic shield that prevents the lines of electric force from going out, and a metal with low resistance,
It is an electromagnetic shield that utilizes the flow of a current in it, and a magnetic shield that uses magnetic materials with low magnetic resistance to confine the lines of magnetic force inside the shield conductor.

Therefore, a method of covering the deflection device with a metal plate such as stainless steel, a method of covering the top, bottom, left and right and the rear part of the cathode ray tube device with a metal plate, a method of providing a transparent electromagnetic wave shielding plate on the front surface of the screen of the cathode ray tube, etc. Has been taken. However, the method of covering the device with a strong metal plate or the method of forming a film made of, for example, a conductive oxide on the screen front surface of the cathode ray tube has a problem in terms of cost.

In the above method, the shielding of the AC magnetic field leaking from the front surface of the screen is not sufficient. Therefore, means such as a method of providing a magnetically permeable ring on the screen side of the deflecting device and a method of compensating for the leakage magnetic field by using a compensation coil that causes a current flowing in synchronization with the deflection current to generate a magnetic field in the opposite direction to the leakage magnetic field are taken. ing.

[0007]

However, an AC electric field is leaking from the cathode ray tube and the cathode ray tube image display device, and recently, the influence of the AC electric field on the human body is concerned. The structure of covering the entire surface of the cathode ray tube device and the cathode ray tube image display device to shield the leakage AC electric field has a problem in terms of cost, and a sufficient effect cannot be obtained by a simple method.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cathode ray tube device and a cathode ray tube image display device which easily and effectively suppress a leakage AC electric field.

[0009]

In order to solve the above-mentioned problems, the present invention provides a cathode ray tube device including a deflecting device having a horizontal deflection coil or a vertical deflection coil for deflecting and scanning an electron beam emitted from an electron gun. At least one compensating electrode connected to the reverse voltage supply unit and a reverse voltage supply unit that generates a voltage waveform having a polarity opposite to that of the deflection voltage waveform applied to the horizontal deflection coil or the vertical deflection coil. It is characterized by having.

In addition, in the cathode ray tube image display device in which a cathode ray tube device having a deflection device having a horizontal deflection coil or a vertical deflection coil for deflecting and scanning an electron beam emitted from an electron gun is installed in a cabinet, A reverse voltage supply unit that generates a voltage waveform having a polarity opposite to that of the deflection voltage waveform applied to the deflection coil or the vertical deflection coil, and at least one compensation electrode connected to the reverse voltage supply unit are provided. It is characterized by

[0011]

The cathode ray tube device or the cathode ray tube of the present invention is applied to the AC electric field generated from the cathode ray tube device or the cathode ray tube image display device not using the present invention and changing in synchronization with the voltage waveform applied to the deflecting device. The electric field generated from the compensation electrode arranged in the tube image display device has a polarity opposite to that of the electric field that is changing in synchronization with the voltage waveform. It

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. (Embodiment 1) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a cathode ray tube apparatus according to this embodiment, which includes a cathode ray tube 10 and a funnel 11 of the cathode ray tube 10.
A deflecting device 13 having a horizontal deflecting coil and a vertical deflecting coil for deflecting and scanning an electron beam emitted from an electron gun (not shown) inserted into the neck 12 of the funnel 11 and mounted outside, and a deflecting device 13 A reverse voltage supply unit 14 for obtaining a voltage having a polarity opposite to that of the deflection voltage waveform applied to the deflection coil, and a compensation electrode 15 to which a voltage having a polarity opposite to that of the deflection voltage waveform by the reverse voltage supply unit 14 is applied. Composed of.
A deflection voltage is applied to the input side of the reverse voltage supply unit 14, one end of the reverse voltage output terminal is connected to the compensation electrode 15, and the other end is connected to the ground potential. An external conductive film 17 and an explosion-proof band 18 are provided on the surface of the cathode ray tube, which are normally led to the ground potential.
There is. In the present embodiment, one end of the reverse voltage supply unit 14 is connected to the explosion-proof band 18 so as to lead to the ground potential.

The cathode ray tube 10 has a structure similar to that of the conventional example, and mainly has a glass envelope composed of a substantially rectangular panel 16 and a funnel 11 connected to the panel 16, and fluorescent light formed on the inner surface of the panel 16. It is composed of a body screen and an electron gun which faces the phosphor screen and is inserted into the neck 12 of the funnel 11 to emit an electron beam for exciting and causing the phosphor screen to emit light.

Deflection device mounted outside the funnel 11
Reference numeral 13 is composed of a horizontal deflection coil that generates a horizontal deflection magnetic field that deflects the electron beam in the horizontal direction and a vertical deflection coil that generates a vertical deflection magnetic field that deflects the electron beam in the vertical direction. A pair of upper and lower saddle type deflection coils, a vertical saddle type saddle type which consists of a pair of left and right saddle type deflecting coils, a horizontal deflecting coil a pair of upper and lower saddle type deflecting coils, and a vertical deflecting coil by a pair of upper and lower toroidal type coils. A saddle toroidal type is generally used. The horizontal deflection coil and the vertical deflection coil are each applied with a predetermined voltage waveform that changes in a predetermined cycle to generate a deflection magnetic field. In the case of the horizontal deflection coil, a pulse-shaped voltage waveform of several hundred to 1 kV is usually used.

Although an AC electric field is leaking from the cathode ray tube device, the inventors of the present invention have examined it and found that the cause is the deflecting device. In other words, the time-varying deflection voltage is supplied in synchronization with the deflection frequency, causing a spatial change in the potential in the deflection coil from the high-voltage side to the low-voltage side. Because it is high, it creates a fluctuating electric field with the ground.

When the deflecting voltage is applied to the deflecting device as described above, the deflecting device generates an AC electric field which changes substantially in synchronization with the deflection voltage waveform. Then, this AC electric field leaks around the cathode ray tube device. The present invention is to generate an opposite AC electric field for compensating / suppressing the AC electric field, combine the electric fields, and shield / suppress the AC electric field.

The structure for that purpose will be described in detail below.
In this embodiment, in order to compensate the leakage AC electric field, as shown in FIG. 1, a reverse voltage supply unit 14 and a pair of upper and lower compensating voltages 15 arranged near the side wall of the panel 16 (lower side The compensation electrode is not shown). As shown in FIG. 2, in the reverse voltage supply unit 14, coils 21a and 21b are wound around a ring-shaped core 20 which is a closed magnetic circuit, a deflection current flows through the coil 21a, and the coil 21a
Both ends of the coil 21b are input side terminals, and one end 22 of the coil 21b serving as a reverse voltage output terminal is connected to the compensation electrode and the other end 23 is guided to the ground potential. When a deflection current flows through the coil 21a, a magnetic flux is generated in the core 20 and an induced electromotive force is generated in the coil 21b. The direction of the electromotive force generated in the coil 21b is the core
Although it is determined by the direction of the magnetic flux flowing inside 20, the compensation electrode cannot apply a negative potential to the polarity opposite to the deflection voltage waveform, that is, when the deflection voltage is positive. Therefore,
By guiding one end on the output side to the ground potential with the reference potential, a voltage waveform 24b having the opposite polarity to the voltage waveform 24a applied to the coil 21a is applied to the compensation electrode. FIG. 3 is a drawing of this equivalent circuit diagram. In FIG. 3, reference numeral 30 denotes a main deflection coil, which is a horizontal deflection coil in the present embodiment, and an electric field having a polarity opposite to that of the leakage electric field which changes substantially in synchronization with horizontal deflection is generated and radiated by the compensation electrode. is doing. In the equivalent circuit diagram shown in FIG. 3, the voltages applied to the pair of upper and lower compensation electrodes are the same and are represented by one.

Next, the compensation function of the leakage electric field in this embodiment will be described with reference to FIGS. 4 to 7. FIG. 4 schematically shows an electric field of an AC electric field generated by the deflection device of the cathode ray tube device at a certain time. The reason why it is “schematic” is that the electric field due to the deflecting device is simply approximated and represented by the potential distribution formed with the ground (ground potential). In the example shown in FIG. 4, the equipotential line 40a is the deflection device 41.
The electric potential line 42a extends in a radial direction from the center of the electric field line 42a. FIG. 5 also schematically shows the electric field of the AC electric field due to the pair of upper and lower compensation electrodes 43 at a certain time. In the case of FIG. 5, the equipotential line 40b spreads around the pair of upper and lower compensation electrodes 43, and
Since a voltage having a polarity opposite to that of the deflection voltage is applied to the cathode, the electric force lines 42b are directed toward the compensation electrodes above and below the cathode ray tube device and toward the screen on the front of the screen. Become. Then, when the leakage AC electric field shown in FIG. 4 and the compensation electric field shown in FIG. 5 are combined, it becomes as shown in FIG. As shown in FIG. 6, by arranging the compensation electrode 43, it can be seen that the leakage electric field spreading around the cathode ray tube device, particularly on the front surface of the screen can be suppressed. FIG. 7 shows the potentials on the cross sections AA ′, BB ′, and CC ′ of FIGS. 4 to 6. The electric field can be calculated as the slope of the electric potential.
It can be seen from FIG. 7 that the electric field generated from the cathode ray tube device is suppressed.

The compensating electrode needs to be insulated from the portion of the outer surface of the cathode ray tube which is led to the ground potential. This is because the compensating electric field cannot be generated unless insulation between the compensating electrode and the part led to the ground potential is maintained.

Next, modifications of the compensation electrode according to the present invention are shown in FIGS. In the example shown in FIG. 8, a pair of compensation electrodes 61 are arranged on the left and right of the side wall of the panel 16 of the cathode ray tube 10. In the example shown in FIG. 9, the compensation electrode 62 is arranged on the entire circumference of the side wall of the panel 16 of the cathode ray tube 10. In this case, since the conductive wire may be wound around the entire side wall of the panel 16, the structure is simple. In this case, compared to the example shown in FIG. 1, the compensation electrode 62 is arranged continuously on the left and right, but it is desirable that the potential of the compensation electrode 62 be uniform over the entire circumference. The example shown in FIG. 10 is a panel of the cathode ray tube 10.
The compensation electrodes 63 are arranged at the four corners of 16. In the example shown in FIG. 11, the compensation electrode 64 is arranged on the screen side flange portion of the deflection device 13 of the cathode ray tube device. further,
The shape of the compensation electrode is not limited to the above-mentioned embodiment, and various shapes such as a disc shape and a square shape can be applied.

The angle dependence of the leakage electric field in the various compensation electrodes described above will be described with reference to FIGS. 12 and 13. FIG. 12 shows the results of measuring the leakage AC electric field by incorporating the cathode ray tube device of the present invention into a metal chassis in a cabinet. FIG. 13 shows the cathode-ray tube device shown in FIG. 1 as a representative state in which the cathode-ray tube device is incorporated in the chassis 68. The reason why the measurement is performed in the state of being incorporated in the chassis is to perform the evaluation in a state close to the actual usage condition. As shown in FIG. 12, in the case of the cathode ray tube device shown in FIGS. 1, 8 and 9 in which the compensating electrode is installed on the front surface of the screen, the leakage electric field is halved as compared with the cathode ray tube device without the leakage electric field countermeasure. It is possible. In the cathode ray tube device shown in FIG. 11, the amount of suppression of the leakage electric field is small because of the same applied voltage as the other compensation electrodes. Since the angle dependence of the electric field compensation as shown in FIG. 12 changes depending on the correlation with the chassis in the cabinet in which the cathode ray tube device is incorporated, it is desirable to appropriately determine the arrangement position of the compensation electrode. As in the example shown in FIG. 11, if the compensating electrode is arranged near the deflecting device, the distribution state of the compensation electric field can be brought close to the distribution state of the leakage electric field. However, when the compensating electrode is arranged in the vicinity of the deflecting device, the reverse potential applied to the compensating electrode needs to be increased to about several hundred to 1 kV, which is about the deflection voltage, and another insulation measure or the like is required in terms of withstand voltage characteristics. ..
In practice, the cathode ray tube device is installed in the chassis, and the leakage electric field can be suppressed to some extent by the chassis except for the front surface of the screen.Therefore, the leakage electric field countermeasure should be to suppress the electric field leaking to the front surface of the screen. Good. Further, since the voltage to be applied to the compensation electrode can be lowered to about half or less of the deflection voltage as it is closer to the front surface of the screen, that is, farther from the deflecting device, it is desirable to dispose the compensation electrode near the screen.

As described above, the voltage applied to the compensation electrode is reduced by disposing the compensation electrode near the screen surface and utilizing the shielding effect of the chassis for the electric field leaking behind the cathode ray tube device. Therefore, it is preferable in terms of voltage resistance characteristics, and compensation / suppression can be performed with a simple structure.

Further, modified examples of the reverse voltage supply section are shown in FIGS. FIG. 14 utilizes the induced electromotive force due to the magnetic flux from the main deflection magnetic field of the deflection device 70.
The loop surface of the coil 72 is oriented in the tube axis direction so that the magnetic flux leaking in the vicinity of the screen-side flange portion 71 of the coil 70 penetrates the loop surface of the coil 72. FIG. 15 shows a leakage magnetic field compensation coil 73.
Is used. Since a leakage magnetic field is generated from the cathode ray tube device, in order to suppress this leakage magnetic field, a coil 74 that generates a magnetic field in the direction opposite to the leakage magnetic field flows in synchronization with the deflection current and is wound around the core 75. There is one in which the leakage magnetic field compensation coil 73 is arranged. So coil 74
The coil 76 connected to the compensation electrode is wound around the same core 75 as the core 75 around which is wound, and the induced electromotive force is utilized. At this time, since no current flows through the compensation electrode itself, the loss is small and the compensating action of the leakage magnetic field is small. Therefore, both the leakage electric field and the leakage magnetic field can be effectively suppressed.

As described above, since the leakage electric field synchronized with the deflection can be easily suppressed by disposing the compensating electrode, it is not necessary to provide a special electromagnetic wave shielding plate on the front surface of the screen, and the front surface of the screen is There is also an advantage that required properties, for example, antiglare properties can be provided without considering electromagnetic wave shielding.

Further, the present invention may be any structure as long as it has a structure in which the leakage electric field is suppressed by the compensation electrodes to which a voltage reverse to the deflection voltage is applied, and the number, installation position, size, etc. of the compensation electrodes are applicable to the present invention. It may be appropriately set in consideration of the size of the cathode ray tube device, the distribution of the leakage electric field, the suppression level, and the like. Specifically, it is also necessary to consider the positional relationship between the compensation electrode and the portion at the ground voltage. Further, the magnitude of the voltage applied to the compensation electrode does not necessarily have to be the same as the magnitude of the deflection voltage, and the magnitude of the applied voltage may be appropriately adjusted depending on the position, length, etc. of the compensation electrode. The adjustment of applied voltage is shown in Fig. 2.
It can be easily implemented by adjusting the number of turns of the coil shown in. In addition, a pair of upper and lower compensation electrodes shown in FIG.
It is also possible to change the applied voltage above and below or to the left and right of the pair of left and right compensation electrodes shown in FIG.

Further, in the above embodiment, VLF (Very Low Frequency: 2 kHz to 400 kHz) due to horizontal deflection is used.
z) As a countermeasure, the one in which the voltage waveform opposite to the voltage waveform applied to the horizontal deflection coil is applied to the compensation electrode has been described, but the present invention is not limited to the above embodiment, and the ELF caused by the vertical deflection is applied. (Extremely Low Frequency: 5H
z to 2 kHz), as a countermeasure, a voltage waveform opposite to the voltage waveform applied to the vertical deflection coil is applied to the compensation electrode,
Further, independent compensation electrodes may be provided so that the VLF countermeasure and the ELF countermeasure are simultaneously performed. (Example 2)

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 16 is a partially cutaway perspective view showing a cathode ray tube image display device according to the present invention. The cathode ray tube image display device 80 has a structure in which a cathode ray tube device 82 is installed inside a cabinet 81. And cabinet 81
A compensation electrode 83 to which a voltage having a polarity opposite to that of the deflection voltage waveform is applied is arranged in the vicinity of the upper and lower sides of the panel side wall of the cathode ray tube device.

A voltage having a reverse polarity to the deflection voltage is applied to the compensation electrode 83 by the reverse voltage supply section 84 having the structure shown in FIG. 2 similar to the first embodiment. As the reverse voltage supply unit, the one shown in FIGS. 14 and 15 can be used as in the first embodiment. Further, in the case of a cathode ray tube image display device, a flyback transformer is usually provided at the bottom of the cabinet 81 to generate a deflection voltage. Therefore, as shown in FIG. 17, a coil 91 is wound around a flyback core 90. It can also be used as a reverse voltage supply unit. Furthermore, it is also possible to obtain a voltage waveform having a polarity opposite to that of the deflection voltage waveform directly synchronized with the board in the cabinet. Further, the compensating electrode can be variously modified as shown in FIGS. 8 to 11 of the first embodiment.

Basically, as shown in FIGS. 4 to 7 of the first embodiment, the operation of this embodiment is basically the electric field and the deflection voltage leaking from the deflection device of the cathode ray tube device when the present invention is not implemented. The leakage electric field is suppressed by synthesizing the electric field generated by the compensating electrode to which the voltage of the opposite polarity is applied. However, since the cathode ray tube device is installed in the cabinet, the ground potential is slightly different from that of the first embodiment, but the basic principle is the same.

Further, the cathode ray tube image display device usually has a structure in which the cathode ray tube device is incorporated in a metal chassis in a cabinet, and the portion excluding the screen is covered with metal. Therefore, the electric field leaking up, down, left and right of the cathode ray tube and backward can be reduced to some extent by the metal chassis. Of course, it is possible to suppress it by the compensation electrode itself without expecting the shielding effect by the chassis,
In this case, the compensating electrode is arranged in the vicinity of the deflecting device which is the center of leakage, and the voltage applied to the compensating electrode is several hundred to 1 kV.
Since it is necessary to raise it to a certain degree, it is not preferable in terms of withstand voltage characteristics. Therefore, if the upper and lower sides and the left and right sides of the cathode ray tube image display device are suppressed by the chassis and the electric field leaking to the front of the screen is taken as a countermeasure, the voltage applied to the compensating electrode can be reduced, so that the voltage-to-voltage characteristic is also improved. desirable.

In this embodiment, the compensation electrode is provided on the panel side wall of the cathode ray tube device in the cabinet, but the present invention is not limited to this. That is, the compensation electrode can be arranged on the back side of the front surface of the cabinet, or can be arranged integrally with the degaussing coil provided in a normal cathode ray tube image display device. The compensating electrode may be arranged at an appropriate position where an opposite electric field capable of compensating for the leakage electric field can be generated. When it is arranged on the back side of the front surface of the cabinet, the compensation electrode may be arranged on the wall surface of the cabinet which is not in contact with the cathode ray tube device, so that it is easy to insulate the portion of the cathode ray tube device from which it is led to the ground potential.

As described above, since the leakage electric field synchronized with the deflection can be easily suppressed by disposing the compensating electrode, it is not necessary to provide a special electromagnetic wave shielding plate on the front surface of the screen, and the front surface of the screen is There is also an advantage that required properties, for example, antiglare properties can be provided without considering electromagnetic wave shielding.

The present invention may have any structure as long as it has a structure in which a leakage electric field is suppressed by a compensation electrode to which a voltage reverse to the deflection voltage is applied, and the present invention is applied to the number, installation position, size, etc. of the compensation electrodes. It may be appropriately set in consideration of the size of the cathode ray tube image display device, the distribution of the leakage electric field, the suppression level, and the like.
Specifically, it is also necessary to consider the positional relationship between the compensation electrode and the portion at the ground voltage. Further, the magnitude of the voltage applied to the compensation electrode does not necessarily have to be the same as the magnitude of the deflection voltage, and the magnitude of the applied voltage may be appropriately adjusted depending on the position, length, etc. of the compensation electrode. The applied voltage can be easily adjusted by adjusting the number of turns of the coil shown in FIG. It is also possible to change the applied voltage above and below or to the left and right of the pair of upper and lower compensating electrodes shown in FIG. 1 or the pair of left and right compensating electrodes shown in FIG.

Further, in the above embodiment, as a measure against VLF (2 kHz to 400 kHz) caused by horizontal deflection, a voltage waveform opposite to the voltage waveform applied to the horizontal deflection coil is applied to the compensation electrode. However, the present invention is not limited to the above embodiment, and ELF (5 Hz to 2
(kHz) As a countermeasure, a voltage waveform opposite to the voltage waveform applied to the vertical deflection coil is applied to the compensation electrode.
Independent compensation electrodes may be provided so that the LF measure and the ELF measure are performed simultaneously.

[0036]

As described above, the cathode ray tube device and the cathode ray tube image display device of the present invention include at least one compensating electrode to which a voltage waveform synchronized with the deflection voltage waveform and having a polarity opposite thereto is applied. By arranging it, it is possible to easily suppress the leakage electric field.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cathode ray tube device according to the present invention.

FIG. 2 is a schematic diagram showing a reverse voltage supply unit for supplying a voltage having a polarity opposite to that of the deflection voltage in FIG.

FIG. 3 is a diagram showing an equivalent circuit diagram of FIG.

FIG. 4 is a diagram for explaining the operation of the present invention, and is a schematic diagram showing a leakage electric field from the deflecting device.

FIG. 5 is a diagram for explaining the operation of the present invention, and is a schematic diagram showing an electric field due to a compensation electrode that is synchronized with the deflection voltage waveform according to the present invention and has a reverse polarity.

6A and 6B are diagrams for explaining the operation of the present invention, and FIGS.
It is a schematic diagram which shows the electric field which synthesize | combined the electric field shown in FIG.

FIG. 7 is a diagram for explaining the operation of the present invention, and is a schematic diagram showing the electric potential at a predetermined position of the electric field shown in FIGS. 4 to 6.

FIG. 8 is a perspective view showing a modified example of the compensation electrode of the present invention.

FIG. 9 is a perspective view showing another modified example of the compensation electrode of the present invention.

FIG. 10 is a perspective view showing another modified example of the compensation electrode of the present invention.

FIG. 11 is a perspective view showing another modification of the compensation electrode of the present invention.

12 is a diagram showing the angle dependence of the effect of compensating for a leakage electric field by the cathode ray tube device shown in FIGS. 1, 8, 9 and 11. FIG.

FIG. 13 shows a state in which the cathode ray device is incorporated in a chassis,
FIG. 2 is a perspective view representatively showing a case where the cathode ray device shown in FIG. 1 is incorporated in a chassis.

FIG. 14 is a perspective view showing a modified example of the reverse voltage supply unit of the present invention.

FIG. 15 is a perspective view showing another modified example of the reverse voltage supply unit of the present invention.

FIG. 16 is a partially cutaway perspective view showing an embodiment of a cathode ray tube image display device according to the present invention.

FIG. 17 is a perspective view showing another modified example of the reverse voltage supply unit of the present invention.

FIG. 18 is a cross-sectional view showing the configuration of a conventional cathode ray tube device.

[Explanation of symbols]

 10 ... Cathode ray tube 13 ... Deflection device 14 ... Reverse voltage supply unit 15, 43, 61, 62, 63, 64, 83 ... Compensation electrode 80 ... Cathode ray tube image display device

Claims (2)

[Claims] 1. A cathode ray tube device comprising a deflection device having a horizontal deflection coil or a vertical deflection coil for deflecting and scanning an electron beam emitted from an electron gun, wherein a deflection voltage waveform applied to the horizontal deflection coil or the vertical deflection coil. A cathode ray tube device, comprising: a reverse voltage supply unit that generates a voltage waveform having a polarity opposite to that of the reverse voltage supply unit and a compensation electrode connected to the reverse voltage supply unit. 2. A cathode ray tube image display device comprising a cathode ray tube device provided in a cabinet, comprising a deflection device having a horizontal deflection coil or a vertical deflection coil for deflecting and scanning an electron beam emitted from an electron gun. A reverse voltage supply unit that generates a voltage waveform having a polarity opposite to that of the deflection voltage waveform applied to the deflection coil or the vertical deflection coil, and at least one compensation electrode connected to the reverse voltage supply unit are provided. A cathode ray tube image display device characterized by the above.