JPS62154434A - Evaluation device for discharge controlling resistor of electron gun - Google Patents

Abstract

PURPOSE:To aim at simplification in evaluation work and retrenchment in material expenses, by installing an electron gun chamber where an electron gun having a discharge control resistor is housed and set up, performing exhaust and knocking, and performing characteristic measurement for the electron gun. CONSTITUTION:In this device, there are provided with an electron gun chamber 11 which sets up an electron gun 1 having discharge controlling resistors R1 and R2 inside, and a getter chamber 12 which sets up a getter material inside and is capable of performing its getting work, and also an interconnecting fine tube 13 forming the required ventilation resistance is installed between both chambers, and in this electron gun chamber 1, for example, at both ends of this chamber, there are provided with terminal leading-out parts 21 and 22 required for knocking handling and characteristic evaluation of the electron gun 1 housed in this chamber 11. And, each inside of both these chambers 11 and 12 is exhausted by a vacuum pump, performing its gethering work with the getter material, and these chambers are yet more turned to high vacuum. Under this state, high voltage of two times or so is impressed on the specified part of the electron gun 1 and knocking handling takes place. Each fixed voltage is impressed and, for example, a cathode current Ik characteristic is measured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for use in evaluating the quality of residual gas in discharge control resistors of electron guns used in television picture tubes and other various electron tubes. The present invention relates to an evaluation device for a discharge control resistor of an electron gun.

[Summary of the invention]

The present invention provides an electron gun chamber in which an electron gun having a discharge control resistor is housed, separate from the final cathode ray tube, and performs exhaust and knocking in this chamber to measure the characteristics of the electron gun. To enable evaluation of discharge control resistors, simplify evaluation work, and reduce material costs.

[Conventional technology]

In the electron gun of a cathode ray tube, discharge occurs between the electrodes or between the electrodes and other parts, and in order to avoid problems such as damage to associated circuit parts etc. due to the large current flowing at this time, , for example, JP-A-55-860
As disclosed in Japanese Patent Application No. 53-157129, etc., a discharge control resistor is connected to the electron gun to suppress the flow of a large current. For example, the fourth
As shown in the figure, the electron gun (1) of the cathode ray tube is housed in the neck (3) of the cathode ray tube body (2), and the cathode is connected to the cathode and the first to fifth grids G1 to G5 are sequentially connected to each other. It consists of an array. In this case, the third to fifth grids G3 to G5 constitute a unipotential main electron lens, and a high voltage HV, that is, an anode voltage, is applied to the third and fifth grids. 3rd and 5th grid G
Power is supplied to the fifth grid G5 through an internal conductive film (5) made of a carbon film or the like applied to the inner surface of the funnel part (4) of the tube body (11) and to which a high voltage of +1V is applied. This is done by bringing the free ends of the elastic metal lead pieces (6) attached to the electrodes into elastic contact and connecting the fifth grid G5 and the third grid G3 through the resistor R1.Then, the other electrode K.

G1. Regarding G2 and G3, each terminal pin (8) is connected by a conductive wire to a corresponding terminal pin (8) which is disposed through a stem (7) sealed to the end of the neck part (3).
In particular, the focus electrode to which a low voltage is applied, that is, the fourth grid G4, and the corresponding terminal pin (8) are connected via a resistor R2. Under normal conditions, no current flows through these resistors R1 and R2, and there is no effect on their characteristics; however, when a current due to discharge attempts to flow, this produces a current suppression effect. In this way these resistances R
1 and R2 have the effect of controlling the discharge, thereby avoiding large disturbances in reproduced images and damage to parts due to undesirable discharge current during operation of the cathode ray tube.

For example, ceramic resistors are used as these discharge control resistors R1 and R2. This ceramic resistor is made by firing a cylindrical molded ceramic material containing carbon in an oxygen atmosphere.On the surface, the carbon disappears as carbon dioxide gas CO2, increasing the resistance and forming an insulating skin. The structure employs a structure in which carbon remains to operate as a resistor having a required specific resistance. However, when a discharge control resistor made of a ceramic resistor is placed inside the tube, residual CO2 gas is sometimes released from inside the resistor in the completed electron tube, which reduces the thermionic emission ability of the cathode. . In this way, in a completed tube in which an electron gun is enclosed, the occurrence of defective electron tubes due to defects in the resistor causes significant losses in labor, material costs, and the like.

[Problem that the invention seeks to solve]

The present invention provides an evaluation device for a discharge control resistor of an electron gun, which is capable of evaluating a discharge control resistor under substantially the same conditions as in a finished tube, and the reduction in the thermionic emission ability of the cathode described above. aims to reduce the incidence of defective electron tubes.

[Means for solving problems]

As shown in FIG. 1, the present invention includes discharge control resistors R1, R
an electron gun chamber (1) in which an electron gun (1) having a
1) and a getter chamber (12) in which getter material is placed and the spitting work can be performed, and both chambers (11) are provided.
A communicating thin tube (13) is provided between the chambers (11) and (12) to have the required ventilation conductance, or in other words, to form the required ventilation resistance.

In the electron gun chamber (11), for example, at both ends thereof,
The terminal lead-out portion (21) and (2) necessary for knocking treatment and characteristic evaluation of the electron gun (11) housed in this chamber (11)
2) will be provided.

Then, the insides of both chambers (11) and (12) are evacuated using a vacuum pump, and the chambers (11) and (12) are sealed airtight.
The inside of the getter chamber (12) is maintained at a high degree of vacuum, and the getter material in the getter chamber (12) is sputtered to further increase the degree of vacuum. In this state, the terminal lead-out portion (21) and (
22), a high voltage that is approximately twice as high as the high voltage HV during operation in the electron tube in which the electron gun (11 is used) is finally applied, for example, after WI such as a "boriko" in which each electrode of the electron gun (11) is present. Perform knocking treatment to eliminate causes of discharge and unstable operation in completed tubes. (23)
indicates the high voltage source, and similarly the terminal lead-out part (2
Through steps 1) and (22), a required voltage, for example, each fixed voltage during operation of the electron tube to be finally constructed, is applied to each electrode of the electron gun Tl), and the characteristics of, for example, the cathode current I are measured.

[Effect]

Evaluation of the discharge control resistor using the above-described apparatus of the present invention can be performed by measuring the characteristics of the electron gun (1), for example, the cathode current 1, as described above.

At this time, if the discharge control resistors R1 and R2 are of good quality, the cathode current IK shows a steep rise as the knocking voltage is applied, as shown in FIG. Alternatively, if R2 is a defective product with residual gas, the electron emission is inhibited by ion bombardment of the cathode material by the gas released from resistor R1 or R2, as shown in FIG. In addition, the steepness and linearity of the rise deteriorate, so
The resistors R1 and R2 can be evaluated based on the characteristics of the cathode current 1.

According to the device of the present invention, the characteristics are evaluated after the gentering and knocking processes are performed, so the electron gun (
1) can be measured under almost the same conditions as when installed as an actual electron tube. And, also, despite performing gettering in this way, this is the electron gun chamber (
11), that is, in a getter chamber (12) that communicates with the required conductance, there is no possibility that the getter material will unnecessarily adhere to the resistor or electron gun (1) and cause characteristic deterioration. effectively avoided.

In practice, the quality of a ceramic resistor, ie, the presence or absence of residual gas, is generally determined by the manufacturing loft of the resistor. In other words, it shows a tendency that it almost never occurs in lots that are different, and that it occurs in lots that are different.

Therefore, by extracting and evaluating several resistors for each lot, it is possible to replace the evaluation with the evaluation of the resistors for each lot, so in reality, all the resistors are evaluated by the device of the present invention. It's not necessary, just do a few for each loft.

〔Example〕

An example of the apparatus of the present invention will be further explained in detail with reference to FIG.

The electron gun (1) to be measured has first to fifth grids G1 to G5 on the cathode, for example, as explained in FIG. 4, and discharge control resistors are installed in the third and fifth grids G3 and G5. R1 is connected, and a discharge control resistor R is connected to the fourth grid G4.
2 are connected.

The electron gun chamber (11), the getter chamber (12), and the communicating thin tube (13) communicating these in the apparatus of the present invention may each be constructed of glass tubes and may be constructed by welding and communicating with each other.

The electron gun chamber (11) is provided, for example, at one end (lla) with a communicating thin tube (13) having an inner diameter of about 611 mm and a length of about 40 mm and communicating with the getter chamber (12) with a required ventilation conductance. .

Also, both ends (lla) and (ll) of the electron gun chamber (11) are
b) are provided with terminal lead-out portions (21) and (22), respectively. The terminal lead-out portion (22) is similar to the terminal pin in the electron tube that is finally obtained.
and fourth grid G1. Each terminal of G2 and G, and in fact each terminal pin (14) of a heater (not shown) that heats the cathode K, is N3J! It is made up of i-distributed information. Further, the other terminal lead-out portion (21) has a terminal pin (1) connected to the elastic fully bent lead piece (6) connected to the fifth grid G5.
5) is penetrated. The terminal pins (14) and (15) of these terminal lead-out parts (22) and (21) are provided through the stems (16) and (17), respectively, so that these stems (16) and (17) It can be constructed by sealing both ends of the electron gun chamber (11). In the center of each of these stems (16) and (17), a tip-off tube (18) that is communicated with the exhaust pump and sealed after exhausting, and the above-mentioned communication thin tube (13) are arranged to penetrate through the center of each of the stems (16) and (17). Ru.

Further, a getter container (19) containing a getter material is accommodated in the getter chamber (12), and gettering, that is, spitting of the getter material, is performed by heating the container (19) with electricity or by high-frequency heating. .

Then, the knocking to the electronic ajc (11) occurs at the terminal part (
From 21) and (22), this is done by applying high voltage as described above between the fifth and third grids G5 and G3 and the fourth grid G4 and other electrodes in the same way as usual.

In addition, the characteristic evaluation was performed on each terminal lead-out portion (22) and (21) of each terminal bin (14) and (1) of each electrode of the electron gun (11).
5) by applying the required voltage to each of Figures 2 and 3.
This is done by measuring the cathode current IK characteristics explained in the figure.

In the above example, the electron gun +11 has a unipotential main electron lens configuration having the first to fifth grids 01 to G5, but the resistor in the electron gun +11 has various other configurations. It can also be used for evaluation.

〔Effect of the invention〕

According to the above-described present invention, the electron gun is finally placed in a tube having an electron gun chamber (11) for measurement and a getter chamber (12), which are separate from the scratch tube tube body, for example. Since we now perform resistor evaluation, compared to cases where defective products are discovered in finished pipes, labor and material costs can be significantly reduced, and material costs have been reduced to less than the conventional l/lo. I was able to stop it.

In addition, since the device of the present invention is capable of performing gettering and non-king processing, the evaluation can be performed under the same conditions as the electron tube that will ultimately be used, making it possible to perform extremely accurate evaluations. It has many benefits such as:

[Brief explanation of drawings]

FIG. 1 is a sectional view of an example of the device of the present invention, FIGS. 2 and 3 are characteristic curve diagrams for evaluation thereof, and FIG. 4 is a configuration diagram of the main parts of an electron tube used for explaining the present invention. +11 is an electron gun, (11) is an electron gun chamber, (12) is a getter chamber, (19) is a getter container, (13) is a communicating thin tube, and (21) and (22) are terminal lead-out portions.

Claims (1)

[Claims] An electron gun chamber in which an electron gun having a discharge control resistor is disposed and a getter chamber in which a getter material is disposed are communicated with each other with a required ventilation conductance. It has a knocking treatment for applying high voltage and a terminal lead-out part for measuring characteristics, and after exhausting the electron gun chamber and the getter chamber and spitting treatment for the getter material, it performs a knocking treatment for the electron gun and the discharge control resistor. An evaluation device for the discharge control resistor of an electron gun, which enables the evaluation of the characteristics of the electron gun.