JPH0562601A - Conditioning of cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide a conditioning method which can condition each electrode and omit high tension insulation measures for a base part and so on, in a conditioning process of a cathode-ray tube, without giving damage to a cathode coating, a bead glass, and to a heater electrode and so on by lowering voltage applied between an anode and a focus electrode, or between the focus electrode and an acceleration electrode. CONSTITUTION:A magnetic field of vertical in direction to an electric field, is applied from the outer periphery of a neck part 3, between an anode 9 and a focus electrode 10, or between the focus electrode 10 and an acceleration electrode 11, so as to generate discharge at an applied voltage lower than as usual, and conditioning is thus carried out. Since the discharge between the respective electrodes can be generated at a voltage lower than in a conventional manner, conditioning can be carried out without giving damage to a cathode coating, a bead glass 15, a heater electrode 14 and so on, and without taking high tension special insulation measures for a base part 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for conditioning a cathode ray tube.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a conventional cathode ray tube. In the figure, a fluorescent screen 4 and a shadow mask 5 are held on the inner surface of the panel portion 1 in a vacuum container including a panel portion 1, a funnel portion 2 and a neck portion 3, and an electron gun 6 is enclosed in the neck portion 3. Has been done. Further, the inner conductive film 7 is applied to the inner surface of the funnel portion 2,
A high voltage is supplied to the electron gun 6 from the anode button 8 through its internal conductive film.

FIG. 6 is an enlarged sectional view of the neck portion 3. 9 is an anode to which a high voltage is applied, 10 is a focus electrode, and 11 is a focus electrode.
Is an acceleration electrode, 12 is a control electrode, 13 is a cathode electrode, 1
Reference numeral 4 is a heater electrode, and each electrode is held by a bead glass 15. Reference numeral 16 is a lead wire for externally supplying a voltage to each electrode other than the anode electrode, and is fixed to the base portion 17. Reference numeral 18 is a silicone resin that insulates between the lead wires 16 connected to each electrode.

Next, a conventional cathode ray tube conditioning method will be described. There are two types of conditioning methods, depending on the location to be conditioned. The first is to condition the space between the anode 9 and the focus electrode 10. The method is to apply a high voltage, which is about three times the normal operating voltage, from the anode button 8 to the anode 9 through the internal conductive film 7 to focus. Conditioning is performed by causing an electric discharge with the electrode 10.

The second is focus electrode and acceleration electrode 11
Between the base portion 17 and the lead wire 16 to the focus electrode 10.
A voltage of about 5 times is applied to cause discharge between the focus electrode 10 and the acceleration electrode 11 for conditioning.

[0006]

In the first conventional conditioning method, since a voltage as high as three times that in normal use is applied to the anode and the focus electrode, the energy of discharge during conditioning is large and often the cathode is used. There is a problem that the coating, the bead glass, the heater electrode, etc. are damaged.

Further, in the second conventional conditioning method, it is necessary to apply a voltage as high as 4 to 5 times higher than that in normal use to the focus electrode. However, a lead wire connected to the focus electrode and a lead wire connected to another electrode are required. Since the withstand voltage between the base and the base is not sufficient only by the silicone resin of the base, there is a problem that it is necessary to take insulation measures such as immersing the entire base in a highly insulating solution.

The first and second aspects of the present invention have been made to solve the above-mentioned problems in the first conditioning method. At the time of conditioning, a discharge is generated at a voltage of about 1/2 that of the prior art. It is possible,
The purpose is to obtain a conditioning method that is less likely to damage cathode coating, beet glass, a heater, or the like.

The inventions set forth in claims 3 and 4 have been made to solve the problems in the second conditioning method as described above. At the time of conditioning, the voltage applied to the focus electrode is about 1/2 of that of the prior art. The purpose of the present invention is to obtain a conditioning method that does not require insulation measures such as immersing the base portion in a highly insulating solution.

[0010]

According to a first aspect of the present invention, there is provided a conditioning method, which comprises:
The discharge voltage is applied from the outer periphery of the neck portion of the cathode ray tube between the anode of the electron gun and the focus electrode, and the magnetic field perpendicular to the electric field is applied.

A conditioning method according to a second aspect of the present invention is the conditioning method according to the first aspect, wherein the direction of the applied magnetic field is periodically switched to the opposite direction.

In the conditioning method according to the third aspect of the present invention, at the time of conditioning, a discharge voltage is applied between the focus electrode and the acceleration electrode of the electron gun from the outer periphery of the neck portion of the cathode ray tube, and this electric field is applied. The magnetic field is applied in the vertical direction.

A conditioning method according to a fourth aspect of the present invention is the conditioning method according to the third aspect, wherein the direction of the applied magnetic field is periodically switched to the opposite direction.

[0014]

According to the first aspect of the present invention, since discharge can be generated at a lower applied voltage than before and the conditioning can be performed, the cathode coating, the bead glass, the heater and the like are not damaged.

According to the invention of claim 2, the conditioning effect is enhanced as compared with the conditioning method of claim 1, so that the processing time can be shortened.

According to the invention of claim 3, about 1/2 of the conventional one
Since it is possible to generate a discharge at a certain voltage and to perform conditioning, it is possible to obtain a withstand voltage between the lead wire connected to other electrodes with only the silicon resin of the base part, and the base part has high insulation properties. It is possible to omit insulation measures such as immersing in the above solution.

According to the invention of claim 4, since the conditioning effect is enhanced as compared with the conditioning method of claim 3, the processing time can be shortened.

[0018]

【Example】

Example 1. FIG. 1 is a partially enlarged sectional view for explaining an embodiment of the invention of claims 1 and 2, and FIG. 2 is a sectional view taken along the line II-II in FIG. A voltage of about 1/2 of the conventional applied voltage is applied. Reference numeral 19 is a magnetic pole of an electromagnet for applying a magnetic field, for example, several k [Oe] to 4 Ok [Oe] (1
A direction of a magnetic field of [Oe] = 1000 / 4π [A / m] parallel to the surface of the beat glass 15 and perpendicular to the electric field between the electrodes of the electron gun 6, that is, a lateral direction in the figure. Apply with.

By doing so, the probability that the electrons jumped out of the focus electrode 10 on the low voltage side will receive a force in the direction according to Fleming's left-hand rule and collide with the surface of the bead glass 15 will collide with the bead glass 15. The generated electrons emit a plurality of secondary electrons, and by repeating this, discharge is generated on the surface of the bead glass 15. Due to this creeping discharge, the degree of vacuum between the anode 9 and the focus electrode 10 is lowered, and experimentally, discharge is generated at a voltage of about ½ that in the absence of a magnetic field. In this embodiment, the direction of the applied magnetic field is constant, and
The effect is the same in either direction to the left.

Example 2. In the above embodiment, the case where the magnetic field is generated by using the electromagnet is shown, but the same effect can be obtained by using the permanent magnet.

Example 3. Further, in the above-described embodiment, the case of the quadrupole tube is shown, but the same effect can be obtained also with the hexapole tube or the cathode line having more electrodes.

Example 4. Next, an embodiment of the invention of claim 2 will be described. The difference from this embodiment of the invention of claim 1 is that the direction of the magnetic field applied between the anode 9 and the focus electrode 10 is constant in the embodiment of claim 1,
In this embodiment, the direction of the magnetic field, an electrical cycle in, for example, in that to switch at 60H _Z. In this way, the direction of the force according to Fleming's left-hand rule that acts on the electrons jumping out of the focus electrode 10 is switched, and the electrons collide with the beat glass 15 on both sides. As a result, a creeping discharge is generated on the surface of the beat glass 15 on both sides, and a discharge is generated on all the opposite surfaces of the electrode than when only one side is formed.
The conditioning effect is enhanced and the processing time can be shortened.

Example 5. In the above embodiment, the direction of the magnetic field of the electromagnet 19, has been to switch at 60H _Z with an electrical means, either mechanically rotate around the neck, or is inverted at fixed intervals along the permanent magnet The same effect can be obtained by switching the direction of the magnetic field.

Example 6. FIG. 3 is a partially enlarged sectional view for explaining an embodiment of the invention of claims 3 and 4, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. ] 40 k [Oe] magnetic field is parallel to the surface of the beat glass 15 from the outer periphery of the neck portion 3 between the focus electrode 10 and the acceleration electrode 11, and perpendicular to the electric field between the electrodes of the electron gun 6. Direction, that is, in the lateral direction in the figure. By doing so, discharge is generated on the surface of the beat glass 15 by the same mechanism as that of the embodiment of the invention of claim 1, and this creeping discharge lowers the degree of vacuum between the focus electrode 10 and the acceleration electrode 11,
Discharge occurs at about half the voltage compared to when there is no magnetic field.

Therefore, since the voltage applied to the focus electrode 10 and the acceleration electrode 11 via the lead wire 16 can be lowered, the withstand voltage can be obtained only by the silicon resin 18 of the base portion 17, so that the base portion 17 is highly insulated. Eliminates the need for immersion in a sexual solution.

Example 7. Next, an embodiment of the invention of claim 4 will be described. This embodiment differs from the embodiment of the invention of claim 3 in that the direction of the magnetic field applied between the focus electrode 10 and the acceleration electrode 11 is electrically similar to the embodiment of the invention of claim 2. period is for example that as replaced by 60H _Z.

With this arrangement, the conditioning effect is enhanced and the processing time can be shortened, as in the second embodiment.

[0028]

According to the invention of claim 1, conditioning is performed by applying a magnetic field in a direction perpendicular to the electric field between the anode 9 and the focus electrode 10, so that discharge can be performed at a low applied voltage. Yes, without damaging the cathode coating, beet glass, heater electrode, etc.
The effect that conditioning can be given is acquired.

According to the invention of claim 2, the direction of the magnetic field applied in claim 1 is periodically switched to the opposite direction, so that the conditioning effect can be further enhanced and the conditioning time can be further shortened. The effect that can be obtained is obtained.

According to the third aspect of the present invention, since the magnetic field is applied between the focus electrode 10 and the acceleration electrode 11 in the direction perpendicular to the electric field for conditioning, discharge can be performed at a low applied voltage. Therefore, it is possible to obtain the effect that the measure for insulating the base portion can be omitted.

According to the invention of claim 4, in claim 3, the direction of the applied magnetic field is periodically switched to the opposite direction. Therefore, the effect of improving the conditioning effect and further shortening the conditioning time can be obtained. can get.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of an embodiment of the invention of claims 1 and 2.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a partially enlarged sectional view of an embodiment of the inventions of claims 3 and 4.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a cross-sectional view showing a configuration of a conventional cathode ray tube.

FIG. 6 is an enlarged cross-sectional view of a neck portion of a conventional cathode ray tube.

[Explanation of symbols]

 3 Neck part 9 Anode 10 Focus electrode 11 Accelerating electrode 19 Electromagnetic pole

Claims (4)

[Claims] 1. When a voltage is applied between an anode of a cathode ray tube and a focus electrode to generate a discharge for conditioning, a magnetic field in a direction perpendicular to an electric field is applied between the anode and the focus electrode from the outer periphery of the neck portion. A method of conditioning a cathode ray tube, characterized in that a discharge is generated at a low voltage when applied. 2. The method of conditioning a cathode ray tube according to claim 1, wherein the direction of the magnetic field applied from the outer periphery of the neck portion is periodically switched to the opposite direction. 3. When conditioning is performed by applying a voltage between a focus electrode and an acceleration electrode of a cathode ray tube to generate a discharge and perform conditioning, a direction perpendicular to an electric field is applied between the focus electrode and the acceleration electrode from the outer periphery of the neck portion. A method of conditioning a cathode ray tube, characterized in that a magnetic field is applied to generate a discharge at a low voltage. 4. The method of conditioning a cathode ray tube according to claim 3, wherein the directions of the magnetic fields applied from the outer periphery of the neck portion are periodically switched to opposite directions.