JPH1050239A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a cathode-ray tube device in which no position change of a compensation electrode arranged in the vicinity of a panel is allowed, and no loss of properly cancelling effect of a leaking alternating electric field is allowed. SOLUTION: A cathode-ray tube device is equipped with a cathode-ray tube in which a reinforcing band 7 is fitted onto the skirt portion 2 outer periphery of a vacuum envelope panel 3, and a deflection device 8 mounted outside a funnel 4. In the cathode-ray tube device, a loop-like compensation electrode 11 which generates a reverse polarity electric field compensating a leaking alternating electric field generated from a horizontal deflection coil is arranged on the outer periphery of the reinforcing band, and the compensation electrode is held by a guide portion provided on the lug plate 13 and a guide portion of a fixture 14 fitted to the reinforcing band, and tension is applied thereto by the fixture.

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 more particularly to a cathode ray tube device for compensating a leakage AC electric field from a deflection device mounted on a cathode ray tube.

[0002]

2. Description of the Related Art Generally, a cathode ray tube is, as shown in FIG.
Panel 3 provided with skirt portion 2 around effective portion 1
And a funnel-shaped funnel 4 connected to the skirt portion 2 of the panel 3. A phosphor screen is provided on the inner surface of the effective portion 1 of the panel 3. An electron gun 6 is sealed in the neck 5 of the funnel 4. Further, a reinforcing band 7 for preventing implosion of the vacuum envelope is attached to the outer periphery of the skirt portion 2 of the panel 3.

A deflecting device 8 is attached to the outside of the funnel 4 of the cathode ray tube. In the cathode ray tube device to which the deflecting device 8 is attached, a magnetic field generated from horizontal and vertical deflection coils of the deflecting device 8 causes The electron beam emitted from the electron gun 6 is deflected so that the phosphor screen is horizontal and horizontal.
An image is displayed by vertical scanning.

Meanwhile, in recent years, OA equipment having such a cathode ray tube device as a display has been remarkably developed, and has become popular not only in offices but also in homes and has become familiar.

[0005] Under such circumstances, there is a problem that noise generated from the electronic equipment, a leaked electric field and a leaked magnetic field cause the precision electronic equipment to malfunction, and various measures have been taken. More recently, the effect on the human body has been regarded as a problem,
The technology of shielding the noise, the leaked electric field and the leaked magnetic field is becoming more important. Particularly in northern Europe, etc., the allowable values of the leakage electric field and the leakage magnetic field are indicated, and the regulation is being spread in advanced countries.

In an electronic apparatus having the above-mentioned cathode ray tube device,
A leakage AC electric field is generated from the deflection device of the cathode ray tube device.
As a relatively simple means for shielding a leakage AC electric field generated from the deflection device of the cathode ray tube device, there is a method of disposing an electromagnetic shielding plate around the cathode ray tube device.

In this method, the top, bottom, left, right, and rear of the cathode ray tube device can be shielded by covering them with a stainless steel plate or a wire mesh. On the other hand, the front surface, that is, the display surface side, can be shielded by disposing a see-through electromagnetic shielding plate. Such a see-through electromagnetic shielding plate is formed on a transparent substrate by ITO (Indium Tin Oxide) or tin oxide (SnO) by a vacuum evaporation method or a spin coating method.
It is obtained by applying a transparent conductive film made of a conductive metal oxide such as ₂ ). Instead of the transparent electromagnetic shielding plate, the shielding can also be performed by a method of forming a transparent conductive film directly on the outer surface of the panel.

In addition to the relatively simple physical shielding means described above, there is a means for electrically suppressing a leaked AC electric field generated from the deflecting device. For example, JP-A-5-207407
As shown in the publication, a compensation electrode is arranged near the reverse voltage supply unit and the panel, and the voltage of the reverse polarity voltage waveform is applied by the reverse voltage supply unit using the deflection voltage applied to the deflection device. Then, there is a method of supplying the voltage having the opposite polarity voltage waveform to the compensation electrode to cancel the leakage electromagnetic wave.

However, in this method, the compensating electrode disposed near the panel is shifted from an appropriate position for compensating for the leakage electromagnetic wave due to external shock or vibration received during transportation or slack due to long-term use. The leakage AC electric field cannot be sufficiently suppressed.

[0010]

As described above, as means for suppressing the leakage AC electric field generated from the deflection device of the cathode ray tube device, a compensating electrode is disposed near the reverse voltage supply section and the panel, and the deflection device is provided in the deflection device. There is a method in which a voltage having a reverse polarity voltage waveform is obtained by a reverse voltage supply unit using the applied deflection voltage, and the voltage having the reverse polarity voltage waveform is supplied to a compensation electrode to compensate for leakage electromagnetic waves. However, in this method, the compensating electrode placed near the panel is loosened due to external shocks or vibrations received during transportation or long-term use, and deviates from the proper position to compensate for leakage electromagnetic waves, and the leakage AC electric field is sufficiently reduced. However, there is a problem that compensation cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the compensating electrode disposed in the vicinity of the panel does not change its position due to slack or the like even when subjected to shock, vibration, or long-term use. An object of the present invention is to configure a cathode ray tube device which does not lose the effect of properly canceling out an alternating electric field.

[0012]

A vacuum envelope comprising a panel provided with a skirt on the periphery and a funnel-shaped funnel is provided, and an electron gun is disposed in a neck of the funnel.
Further, a reinforcing band is attached to the outer periphery of the skirt portion of the panel, and a cathode ray tube in which a lug plate for attaching a cathode ray tube is fixed to the reinforcing band, and a cathode ray tube mounted outside the funnel to deflect the electron beam emitted from the electron gun. In a cathode ray tube device having a deflection device having a horizontal and vertical deflection coil, a loop-shaped compensation electrode that generates an electric field of the opposite polarity that compensates for a leakage AC electric field generated from the horizontal deflection coil is arranged on the outer periphery of the reinforcing band, The compensating electrode is held by a guide portion provided on the lug plate and a guide portion of a fixture attached to the reinforcing band, and tension is applied by the fixture.

[0013] In addition, there is provided a vacuum envelope comprising a panel provided with a skirt portion in a peripheral portion and a funnel funnel,
A cathode ray tube device comprising: a cathode ray tube in which an electron gun is arranged in a neck of a funnel; and a deflecting device mounted outside the funnel and having horizontal and vertical deflection coils for deflecting an electron beam emitted from the electron gun. A loop-shaped compensation electrode for generating an electric field of opposite polarity for compensating for a leakage AC electric field generated from the horizontal deflection coil on the outer periphery of the panel skirt portion, and fixing the compensation electrode on the outer periphery of the panel skirt portion. And a structure in which tension is applied by this fixture.

Further, the fixture for applying tension to the loop-shaped compensation electrode is constituted by an elastically deformable member which can be elastically deformed in the radial direction of the cathode ray tube.

The fixture for applying tension to the loop-shaped compensation electrode includes a holding section provided with a guide section for holding the loop-shaped electrode, and a deforming section for deforming the holding section in the radial direction of the cathode ray tube. did.

Further, the guide portion of the fixture is constituted by a groove.

Further, the guide portion of the lug plate is constituted by a groove.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cathode ray tube device which is one embodiment of the present invention. This cathode ray tube device comprises a cathode ray tube 10, a deflecting device 8, and a loop-shaped compensation electrode 11 for compensating a leaked AC electric field generated from the deflecting device 8.

The cathode ray tube 10 has a substantially rectangular panel 3 provided with a skirt portion 2 around the effective portion 1.
And a funnel-shaped funnel 4 connected to the skirt portion 2 of the panel 3. A phosphor screen is provided on the inner surface of the effective portion 1 of the panel 3. An electron gun 6 is sealed in the neck 5 of the funnel 4. Further, a reinforcing band 7 such as a tension band for preventing implosion of the vacuum envelope is attached to the outer periphery of the skirt portion 2 of the panel 3. This reinforcement band 7
A lug plate 13 for attaching and fixing a cathode ray tube to a display device on an outer surface corresponding to a corner of the panel 3;
Is installed. At least one portion of the outer surface of the intermediate portion of the reinforcing band 6 is provided with the loop-shaped compensation electrode 11.
Is attached.

The deflecting device 8 is mounted near the boundary between the large diameter portion 16 of the funnel 4 of the cathode ray tube 10 and the neck 5 and deflects the electron beam emitted from the electron gun 6 in the horizontal direction. A coil and a vertical deflection coil that deflects vertically. The electron beam emitted from the electron gun 6 is deflected by the horizontal and vertical deflection main magnetic fields generated by the horizontal and vertical deflection coils, and scans the phosphor screen horizontally and vertically to form an image on the phosphor screen. indicate.

The loop-shaped compensating electrode 11 is made of a metal wire wound in one or more loops. To attach the loop-shaped compensation electrode 11 to the reinforcing band 7 of the cathode ray tube 10, as shown in FIG.
3 is provided with a guide portion 18 formed of a groove formed in the length direction of the reinforcing band 7. As described above, the fixing device 14 is attached to at least one portion of the outer surface of the intermediate portion of the reinforcing band 7. The fixing device 14 is made of an elastic member that is curved in the length direction of the reinforcing band 7, and has two cuts 19 in the center in the width direction along the length direction of the reinforcing band 7. Are formed as guide portions of the loop-shaped compensation electrode 11.

The loop-shaped compensation electrode 11 is connected to the lug plate 13.
Guide 18 and fixture 14 comprising grooves provided in
Is held by the guide portion between the two notches 19, and tension is applied by the elasticity between the two notches 19 of the fixing member 14 made of an elastic member.

The depth of the groove of the lug plate 13 is preferably larger than the radius of the cross section of the loop-shaped compensating electrode 11. For example, when the radius of the cross-section of the loop-shaped compensating electrode 11 is 0.5 mm, it is 0.5 mm. It is formed at the above depth. The fixture 14 is formed of an elastic material such as phosphor bronze, SUS301 stainless steel or the like, and the width between the two cuts 19 is preferably larger than the diameter of the cross section of the loop-shaped compensation electrode 11. When the diameter of the cross-section of the loop-shaped compensation electrode 11 is 1.0 mm, the size is formed to be 1.0 mm or more.

For such a loop-shaped compensation electrode 11, an output signal obtained from a flyback transformer or a horizontal output transformer connected to a horizontal deflection coil of the deflection device 8 is used. A voltage having the opposite polarity and the same phase as the voltage supplied to the horizontal deflection coil from the reverse voltage supply unit via the amplitude adjustment circuit or the like is supplied, and the polarity is opposite to the leakage AC electric field generated from the horizontal deflection coil of the deflection device 8. , Generating an in-phase electric field.

The number of turns of the metal wire of the loop-shaped compensation electrode 11 is adjusted according to the amount of the electric field generated by the loop-shaped compensation electrode 11.

When the cathode ray tube device is configured as described above,
A leakage AC electric field generated from the horizontal deflection coil of the deflection device 8, particularly a high-voltage pulse electric field generated during a retrace period of horizontal scanning, which is a problem, is converted into a high-voltage pulse of opposite polarity and in phase generated from the loop-shaped compensation electrode 11. It can be offset by an electric field. According to the measurement results, the leakage AC electric field of band II corresponding to the VLF band of 2 to 400 kHz generated from the horizontal deflection coil could be suppressed to 0.5 V / m or less.

Further, even if external shock or vibration is applied to the loop-shaped compensation electrode 11 or the cathode ray tube device is used for a long period of time, the loop-shaped electrode 11 can be prevented from being loosened and the positional displacement accompanying the same can be prevented. In which the effect of appropriately compensating for the above is not lost.

That is, in a conventional cathode ray tube device having a compensating electrode, the compensating electrode is slackened due to external shock or vibration caused by transportation or long-term use, and the resulting misalignment causes a horizontal deflection coil of the deflecting device. However, in the cathode ray tube device of the above embodiment, the loop-shaped compensating electrode 11 has the lug plate 1 attached to the reinforcing band 7.
The position is regulated by a guide portion between the guide portion 18 formed on the third member 3 and the two notches 19 provided on the fixing member 14, and the elasticity between the two notches 19 of the fixing member 14 made of an elastic member. Adds tension. Therefore, the cathode ray tube device can be maintained at a position where the leaked AC electric field is appropriately compensated without being loosened even when subjected to external shock, vibration or long-term use, and can maintain the effect of properly compensating the leaked AC electric field. .

That is, in the conventional cathode ray tube device, when the external shock or vibration caused by transportation or the like or when used for a long time, the loop-shaped compensation electrode is about 5 mm in front of the cathode ray tube.
When changed, 0.4 V / m, about 10 mm, and when changed, 0.8 V / m leaked AC electric field changed. However, in the cathode ray tube device of the above embodiment, it was kept within the error range of the measurement, It could be unchanged.

In the above embodiment, the fixing member is provided with two cuts in the elastic member curved in the length direction of the reinforcing band, and the space between these two cuts is used as a guide portion of the loop-shaped compensation electrode. However, the fixing device 14 shown in FIG.
A groove 21 is provided in the elastic member curved in the width direction of the reinforcing band 7 along the length direction of the reinforcing band 7, and the holding portion 22 uses the groove 21 as a guide portion of the loop-shaped compensation electrode. And a deforming portion 23 which is also attached to the reinforcing band 7 and deforms the holding portion 22. As shown in FIG.
2, a cam-shaped holding part deformed body 25 having an engaging portion 24 formed at the front end thereof and engaging with the back surface of the groove 21 of the holding portion 22. The holding portion deformed body 25 is rotatable. And a supporting body 26 for supporting.

In this fixture 14, as shown in FIG. 4 (a), the holding part deformable body 25 is rotated as shown by an arrow 27, and the engaging part 24 at the tip thereof is inserted into the groove 21 of the holding part 22. , The holding portion 22 is elastically deformed so as to bulge in a direction perpendicular to the outer surface of the reinforcing band 7 indicated by an arrow 28, that is, in a radial direction of the cathode ray tube. Thereby, tension is applied to the loop-shaped compensation electrode held in the groove 21 of the holding section 22.

The same effects as those of the above embodiment can be obtained by using such a fixture 14.

In the above embodiment, the cathode ray tube device in which the loop-shaped compensation electrode is disposed on the outer periphery of the reinforcing band has been described. However, a groove or the like is directly formed at each corner of the skirt portion of a substantially rectangular panel. Even if the supporting member provided with the guide portion is attached, and the fixing portion is directly attached to at least one of the intermediate portions of the supporting members, and the loop-shaped compensation electrode is arranged on the supporting member and the fixing portion, A cathode ray tube device having the same effects as those of the above embodiment can be obtained.

[0035]

As described above, in the cathode ray tube device in which the deflection device is mounted outside the funnel of the cathode ray tube, the horizontal deflection coil is provided on the outer periphery of the reinforcing band attached to the outer periphery of the skirt portion of the panel of the cathode ray tube. A loop-shaped compensation electrode for generating an electric field of the opposite polarity for compensating the generated leakage AC electric field was arranged, and the loop-shaped compensation electrode was attached to a guide portion provided on a lug plate attached to the reinforcement band and to the reinforcement band. A structure in which the fixture is held by the guide of the fixture and tension is applied by the fixture, or a loop-shaped compensation electrode is held on the outer periphery of the panel skirt by the guide of the fixture directly attached to the outer periphery of the panel skirt. And an elastically deformable member capable of elastically deforming the fixture in a radial direction of the cathode ray tube by using a structure in which tension is applied by the fixture. Is composed of a holding portion provided with a guide portion for holding the loop-shaped compensation electrode, and a deforming portion for deforming the holding portion in the radial direction of the cathode ray tube. When the guide part of the plate is composed of grooves, the leakage AC electric field generated from the horizontal deflection coil is canceled by the electric field having the opposite polarity and the same phase as the leakage AC electric field generated from the horizontal deflection coil generated from the loop-shaped compensation electrode Can be.

Moreover, even if external shocks or vibrations are applied or the cathode ray tube device is used for a long period of time, the effect of preventing the slack of the loop-shaped compensating electrode and the accompanying positional deviation can be compensated for appropriately. Can be obtained as a cathode ray tube device which does not lose power.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a structure of a lug plate and a fixture attached to a reinforcing band of the cathode ray tube device.

FIG. 3 is a perspective view showing a fixing device different from the fixing device shown in FIG. 2;

4 (a) is a side view showing the structure of the fixture shown in FIG. 3, and FIG. 4 (b) is a view showing a configuration of a deformed portion thereof.

FIG. 5 is a perspective view showing a configuration of a conventional cathode ray tube device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Skirt part 3 ... Panel 4 ... Funnel 5 ... Neck 6 ... Electron gun 7 ... Reinforcement band 8 ... Deflection device 13 ... Lug plate 14 ... Fixture 18 ... Guide part 21 ... Groove 22 ... Holding part 23 ... Deformation part

Claims (6)

[Claims] A vacuum envelope comprising a panel provided with a skirt portion on a peripheral portion thereof and a funnel-shaped funnel, an electron gun is provided in a neck of the funnel, and an outer periphery of the skirt portion of the panel. A cathode ray tube in which a reinforcing band is attached to the reinforcing band, and a cathode ray tube mounting lug plate is fixed to the reinforcing band, and a horizontal and vertical deflection unit mounted outside the funnel and deflecting an electron beam emitted from the electron gun. A deflection device having a coil, wherein a loop-shaped compensation electrode for generating an electric field of the opposite polarity for compensating for a leaked AC electric field generated from the horizontal deflection coil is arranged on an outer periphery of the reinforcing band, and the compensation is performed. An electrode is held by a guide portion provided on the lug plate and a guide portion of a fixture attached to the reinforcing band, and tension is applied by the fixture. Cathode ray tube apparatus characterized by being applied. 2. A cathode ray tube having a vacuum envelope comprising a panel provided with a skirt portion on a peripheral portion thereof and a funnel-shaped funnel, and a cathode ray tube having an electron gun disposed in a neck of the funnel; A deflecting device mounted on the outside and deflecting an electron beam emitted from the electron gun, the deflecting device having horizontal and vertical deflecting coils. Leakage generated from the horizontal deflecting coil on the outer periphery of the skirt portion of the panel. A loop-shaped compensation electrode for generating an electric field of the opposite polarity for compensating the AC electric field is arranged, and this compensation electrode is held by a guide portion of a fixture provided on the outer periphery of the skirt portion of the panel, and tension is applied by the fixture. A cathode ray tube device characterized by being used. 3. The cathode ray tube device according to claim 1, wherein the fixture for applying tension to the loop-shaped compensation electrode comprises an elastically deformable member which is elastically deformable in a radial direction of the cathode ray tube. 4. A holding section provided with a guide section for holding the loop-shaped compensation electrode by a fixture for applying tension to the loop-shaped compensation electrode, and a deforming section for deforming the holding section in the radial direction of the cathode ray tube. 3. The cathode ray tube device according to claim 1, wherein the cathode ray tube device is configured. 5. The cathode ray tube device according to claim 1, wherein the guide portion of the fixture is a groove. 6. The cathode ray tube device according to claim 1, wherein the guide portion of the lug plate is a groove.