JPS6351030A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To easily make a cathode-ray tube having a good withstand voltage characteristic by performing a withstand voltage treatment in a vacuum atmosphere or a non- oxidizing atmosphere for an electron gun body structure composed of plural electrodes assembled in a given structure, and incorporating the electron gun body structure passed withstand voltage tests into an envelope. CONSTITUTION:Connectors 9 are installed on plural electrodes of an electron gun body structure, especially on the third-the sixth electrodes G3-G6 to which a comparatively high voltage is applied, and the electrodes are arranged in a vacuum vessel. After the pressure in the vacuum vessel is made to 10<-4>-10<-5> Torr, a spark discharge is generated with the impressing on of a high voltage generated by an induction coil on electrodes G3-G6 on which the connectors 9 are installed, via the connectors 9, and withstand voltage treatment is performed. After that, required withstand voltage tests such as a withstand voltage test and a touch test etc. are conducted in the vacuum vessel with the impression of a rated voltage on each electrode via the connector 9. The electron gun body structure passed the tests is mounted on a cathode-ray tube envelope neck and it is exhausted to form a cathode-ray tube. Thus a cathode-ray tube having a good withstand voltage characteristic can be easily manufactured.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a cathode ray tube, and in particular, a method suitable for manufacturing a cathode ray tube in which a high voltage is applied to the electrodes of an electron gun assembly. l
The present invention relates to a method for manufacturing a ttriode ray tube.

(Prior art) General information: (') In a cathode ray tube such as a color receiver 9 tube, a voltage of 10 to 30 KV is applied to the anode or the final electrode of the electron gun assembly, and a voltage of several hundred V to several KV is applied to the other electrodes. Be used as such.

Therefore, it is important to improve the withstand voltage characteristics between the electrodes of the electron gun assembly to eliminate sparks and stray emissions between the electrodes or between the electrodes and members located near them.

Incidentally, the above-mentioned sparks and stray emissions are mainly caused by foreign matter such as dust, dirt, and lint on the electron gun assembly components, foreign matter adhering to the electron gun assembly during assembly, welding splash, and other internal parts such as the inner shield, This is caused by foreign objects falling from the shadow mask, especially its frame, inner tube, fluorescent screen, etc.

To eliminate sparks and stray emissions from the finished cathode ray tube.

Usually, cathode ray tubes are subjected to withstand voltage treatment called high voltage aging after being evacuated. However, splashes and welding splashes that occur during molding of electron gun assembly components or assembly of the electron gun assembly cannot be easily removed by high-voltage aging after the tube is assembled, since they are strongly adhered. Moreover.

Compared to the final electrode and its adjacent electrodes to which voltage is relatively easily applied during high-voltage aging, other electrodes to which high voltage is difficult to apply are difficult to remove.

In addition, a resistance element is attached to the electron gun structure that has recently been used, and the electron gun structure is configured to distribute a predetermined voltage to a plurality of electrodes via this resistance element. The above high voltage aging cannot be applied to cathode ray tubes.

(Problems to be Solved by the Invention) The conventional method for manufacturing cathode ray tubes, in which the electron gun assembly is assembled into the cathode ray tube envelope and then subjected to high voltage aging, is as follows: It has good withstand voltage characteristics, as it has a low ability to remove splashes and welding splash that occur during molding and assembly of the electron gun structure, and cannot be applied to electron gun structures that have resistive elements attached. There are problems with the manufacture of cathode ray tubes.

The present invention was made to solve these problems, and an object of the present invention is to provide a method for easily manufacturing a cathode ray tube having good withstand voltage characteristics.

(Structure of the Invention) (Means for Solving the Problems) The present invention provides a method for manufacturing a cathode ray tube in which an electron gun assembly consisting of a plurality of electrodes assembled in a predetermined structure is placed in a vacuum atmosphere or a non-oxidizing atmosphere. The electron gun assembly was subjected to withstand voltage treatment and passed the withstand voltage test, and then assembled into the envelope.

(Function) Before the electron gun assembly assembled into the predetermined structure as described above is assembled into the envelope (146 units are subjected to withstand voltage treatment, the electron gun assembly is assembled into the envelope). Compared to the conventional withstand voltage treatment that is performed later, it is possible to apply a higher voltage between the electrodes, and it is also possible to perform a variety of withstand voltage treatments, making it easier to create cathode rays with good withstand voltage characteristics. It can be a tube.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 1 shows an example of an electron gun assembly for a color picture tube before being incorporated into a cathode ray tube envelope.

This electron gun structure includes the first to sixth electrodes (G,) to (G
5), a strap (1) and a stem lug (2) supporting the cathode on the side of the first electrode (G,) are integrally supported by a pair of insulating supports (3), and
A convergence cup (4) is attached to g). In addition, the stem lug (2) has stem Z, (S
) is welded to the stem (5), and the stem (5) is integrally attached via this inner lead (6). Further, on the outside of the convergence cup (4), there are a plurality of valve spacers (4) that press against the inner surface of the neck and support the tip of the electron gun assembly when the electron gun assembly is assembled into the envelope. 7) is installed.

By the way, in this embodiment, as shown in FIG. Attach the connector (9) and place it in the vacuum container,
After setting the inside of this vacuum container to 10-4 to 1O-5 Torr, a high voltage is generated from the induction coil between the electrodes (G1) to (G6) attached to this connector (9) via the connector (9). is applied to generate spark discharge, and voltage resistance treatment is applied.

At this time, if necessary, for example, the second. Third electrode (G2)
It is better to insert an insulating spacer in advance between , (Gff), and instead of this insulating spacer, the cathode and gSl, the second electrode t44CG, ), (G2)
It is recommended that an electrical protection circuit be connected to the

After that, the connector (9) is inserted into the vacuum container.
A predetermined voltage is applied to each electrode via the electrode, and required voltage resistance tests such as withstand voltage and touch tests are performed.

If there is a problem with this withstand voltage test, apply high voltage to the induction coil again and repair it.

Cathode ray tubes are manufactured by assembling the electron gun assembly that has passed this withstand voltage test into the neck of the cathode ray tube envelope, and performing exhaust operations, etc.6.

After the above evacuation, it is optional to perform a conventional high voltage age lag.

When the electron gun assembly is subjected to withstand voltage treatment before being assembled into the envelope as described above, each electrode can be subjected to withstand voltage treatment at a higher voltage than conventional high voltage aging.

For example, in conventional high-voltage aging performed after the electron gun assembly is assembled into an envelope, the final electrode, the 671st! Pole (G6) and the fifth electrode (G,) adjacent to it
In order to avoid damage to the neck, only a voltage of about 60 KV or less could be applied during the process, but in the above embodiment, it is not necessary to take neck damage into consideration, so a high voltage of 70 to 80 KV can be applied. . Therefore, an electron gun assembly with good withstand voltage characteristics can be incorporated into a cathode ray tube, and as a result, a cathode ray tube with good withstand voltage characteristics can be easily manufactured. Furthermore, according to this method, a large number of electron gun assemblies can be processed simultaneously, improving production efficiency.

Note that if the electrodes are heated to about 400 to 600°C using, for example, a high-frequency induction coil during the withstand voltage treatment shown in the above example, it is possible to obtain an electron gun structure with much better withstand voltage characteristics. can. That is, when the electrode is heated,
The spacing between the electrodes becomes smaller due to thermal expansion, and electron radiation from foreign objects acts as a barrier, making it possible to carry out voltage resistance treatment more effectively.

In addition, in the above embodiment, the voltage resistance treatment was performed in vacuum, but the voltage resistance treatment was performed in a non-oxidizing atmosphere consisting of nitrogen, carbon dioxide, hydrogen, argon, helium, or a mixed gas of two or more of these. Processing may be performed. In particular, when performed in such an atmosphere, discharge occurs even at a lower voltage than withstand voltage treatment in a vacuum, and a wide variety of treatments can be performed.

In the above embodiment, a connector is attached directly to the electrode to apply a voltage, but the voltage may also be applied from the outer lead of the stem via the inner lead.

Furthermore, in the above embodiments, a normal electron gun structure was described without a resistor element attached, but an electron gun used with a resistor element attached thereto can also be used without the resistor element attached. All you need to do is to apply a withstand voltage treatment and attach a resistive element to the electron gun structure that has passed the withstand voltage test, and then incorporate it into the cathode ray tube. can be manufactured.

〔Effect of the invention〕

If an electron gun assembly consisting of a plurality of electrodes assembled in a predetermined structure is subjected to withstand voltage treatment in a vacuum atmosphere or non-oxidizing atmosphere before being assembled into a cathode ray tube envelope, it will not be possible to assemble it into a conventional envelope. Unlike high-voltage aging, which is performed after loading, there are no restrictions on the envelope, and the required withstand voltage treatment can be performed as desired. Therefore, if a cathode ray tube is manufactured by incorporating an electron gun assembly that has been subjected to this withstand voltage treatment and passed a withstand voltage test, a cathode ray tube with good withstand voltage characteristics can be easily manufactured. Furthermore, according to this method, a large number of electron gun assemblies can be subjected to voltage withstanding treatment at the same time, and the conventional high voltage aging can be shortened or eliminated, thereby improving production efficiency. Further, there is an effect that even a cathode ray tube having an electron gun assembly with a resistive element, which could not be subjected to voltage resistance treatment in the past, can be made to have good voltage resistance characteristics.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of an electron gun bridge body for a color picture tube, which is the object of an embodiment of the present invention, and FIG. 2 is a diagram for explaining its withstand voltage treatment. (1)...Strap (2)...Stem lug (3)...Insulating support (4)...Convergence cup (5)...Stem
(6)...Inner lead (7)...Valve spacer (9)...Connector (G,) ~ (G6)
··electrode

Claims (1)

[Claims] An electron gun assembly consisting of a plurality of electrodes assembled into a predetermined configuration is subjected to withstand voltage treatment in a vacuum atmosphere or a non-oxidizing atmosphere, and the electron gun assembly that has passed the withstand voltage test is assembled into an envelope to generate cathode rays. A method for manufacturing a cathode ray tube, the method comprising manufacturing a tube.