JPS58220336A - Aging of cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent deterioration of emission caused by contamination of electron emission substance being generated during current aging and facilitate aging control by suspending for a comparatively long time to heat the electrode after executing the process for stabilizing electron emission substance, being followed by a current aging process. CONSTITUTION:The electrode heating stop stage where heating of electrode is suspended is carried out after the electron emission substance stabilizing stage. For example, supply of heater voltage is suspended and thereby heating of cathode and electrode in the vecinity of cathode is suspended. In the electron emission substance stabilizing process, when the cathode is heated with the heater voltage which is equal to almost doubled rated voltage, the maximum amount of gas is discharged, it is diffused into the discharged gas tube and is partly absorbed by the getter. A certain inconvenience is generated because the current aging process is started under the condition that the discharged gas is left in the periphery of the electron gun electrode group including the cathode but a large part of the discharged gas being left by the stop of heating is also absorbed by the getter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for aging a cathode ray tube. In the manufacture of cathode ray tubes, a cathode ray tube that has been evacuated to six vacuums undergoes a high voltage treatment process in which a high voltage of about 2 to 8 times the operating voltage is applied, and then enters an aging process. Conventionally, this process is roughly divided into two stages. The first stage is a stabilization treatment stage for the electron emitting material of the cathode.

The electron-emitting substance in the cathode is activated by heating by applying electricity to the heater, and the steps are usually to heat it by electricity for one to several minutes at the rated voltage of the heater, and then apply a voltage of about 1.6 times the rated voltage. is applied for several minutes, and then a voltage approximately twice the rated voltage is applied for one to several minutes. And during this time.

No voltage is applied to the other electrodes except for the heater. Next, in the second stage, called current aging processing, the first to
Emissions were taken out from the cathode and bombarded with electrons at the eighth grid electrode. So-called electron bombardment heats the electrode to raise its temperature and release gas, and at the same time, the impact energy of these electrons dissociates and decomposes oxides and releases gas from the electrode. This prevents the initial deterioration of emissions and early deterioration of life due to pollution.

Usually, the voltage applied to the heater during the current aging is about 1.5 times the rated heater voltage, and the cathode is heated to a higher temperature than the normal operating temperature, and the gas released from the electrode during the current aging is generated. Preventing deterioration of the emission ability of electron-emitting substances.

And the whistle 1 grid electrode has several V to several +V, and the second grid! Generally, a DC voltage of 100 V to several hundred V is applied to the pole, and a DC voltage of 0 to several IV is applied to the eighth grid electrode. The voltage applied to these electrodes does not have to be a fixed -i value, but the voltage can be increased sequentially.

Alternatively, the temperature can be lowered, and suitable conditions are selected in consideration of the emission characteristics of each type, and aging is performed for a period of several tens of minutes to several hours.

However, the conventional aging method performed in this manner has the following disadvantages. In other words, during the stabilization process of the electron emitting substance in the first stage ring, the electron gun components including the cathode are heated by the heating of the heater, and the gas emitted is in the vicinity of the cathode and the first to eighth grid electrodes. When the heater is full, especially when a voltage approximately twice the rated voltage is applied to the heater, the amount of gas released is maximum. When this cathode is filled with this emitted gas and subsequently moves to the second stage of current aging, the cathode

Gas existing in the vicinity of the first to @8 lattice electrodes, particularly in the path of electrons emitted from the cathode, is converted by the electrons into positive ions, which are attracted to the cathode and implanted into the electron-emitting material.

This causes a decrease in the emission ability of the electron-emitting substance. Therefore, conventionally, a great deal of effort has been spent on setting and managing conditions such as the voltage applied to the heater in both stages, the voltage applied to each electrode and its time, but it has not been possible to completely prevent the decline in emission performance. I hated not being able to do it.

This invention was made to eliminate the above drawbacks.
1Fj prevents emission deterioration caused by contamination of electron-emitting substances that conventionally occurs during current aging.

Another object of the present invention is to provide a method for aging a cathode ray tube that allows the aging operation to be performed easily.

An embodiment of the present invention will be described below.

The aging method for the cathode ray tube in this embodiment is to stabilize the electron-emitting substance, then stop heating the electrodes for a relatively long time, and then perform current aging! The above-mentioned stabilization treatment and current aging treatment of the electron emitting material may be performed under exactly the same conditions as in the conventional method.

In detail, the electrode heater stopping step in which electrode heating is stopped is performed following the electron-emitting material stabilization treatment step, and for example, the heater voltage supply is stopped to stop heating the cathode and the electrodes close to the cathode. do. As mentioned above, in the stabilization treatment step of the electron emitting material,
When heating the cathode with the heater voltage approximately twice the rated voltage, the amount of released gas is at its maximum.This released gas diffuses into the tube, and some of it is absorbed by the getter, but By moving to the current aging treatment stage with gas remaining around the electron gun electrode group including the cathode,
This causes the inconvenience mentioned above. Therefore, in this embodiment, most of the released gas left behind by the electrode heating element stopping step is absorbed by the getter, and this electrode heating element stopping step is carried out for several minutes to several tens of minutes. This time provides time for the gas emitted at the final stage of the stabilization process of the electron-emitting material to diffuse and be absorbed by the getter, and can be set empirically depending on the structure of the S-gun. Of course, if the equipment and other constraints are relaxed, the time may exceed several tens of minutes.

Therefore, when the cathode and the vicinity of the first to eighth grid electrodes at the end of the electrode heating body stop stage move to the current aging treatment stage in order to create a good vacuum state,
Unlike the conventional method, impurity contamination during the current aging jig processing stage is reduced, and emission deterioration can actually be completely eliminated.

At the same time, there is still a large amount of leeway in setting and managing conditions such as aging time, applied heater voltage, and applied electrode voltage, making aging operations easier.

As you can see from the above explanation, if you admire this invention.

It is possible to prevent emission deterioration due to contamination of electron-emitting substances, which conventionally occurs during current aging, and to facilitate the aging operation.

Agent Shin Kuzuno (1 other person)

Claims (1)

[Claims] (1) [1, After stabilizing the child-emitting substance,
A method for aging a cathode ray tube, which comprises suspending t-electrode heating for a relatively long period of time, and then performing current aging treatment.