JPH041452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a socket used in the manufacturing process of color cathode ray tubes.

In general, the manufacturing process for color cathode ray tubes includes an aging process for stably emitting electrons from the cathode of the electron gun. This aging step is carried out by setting a socket on a pin connected to the electrode of the color cathode ray tube and applying a high voltage to the electron gun through this socket. During this aging step, electrons (negative ions) fly out from the cathode surface with linear trajectories, and these electrons act on positive ions liberated within the cathode ray tube. However, in the past, since electrons ejected along a linear trajectory as described above, positive ions sometimes flew directly into the cathode surface along the linear trajectory of the electrons and bombarded the cathode surface.

On the other hand, the cathode surface of a color cathode ray tube is formed into a uniform surface with a forming layer of barium oxide or the like. Therefore, when positive ions bombard this cathode surface as described above, the uniformly formed barium oxide layer is destroyed, and the surface becomes rough, or in extreme cases, the barium oxide layer disappears. It may be stored away. When the surface of the cathode becomes rough in this manner, electrons are not emitted uniformly from the cathode, and the essential performance of the cathode ray tube is deteriorated. In some cases, the performance deteriorated to an extreme extent, making it completely unusable.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a socket for a color cathode ray tube that can improve the performance of the cathode ray tube.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.
The figures show an embodiment of a color cathode ray tube socket according to the present invention, with FIG. 1 being a sectional view and FIG. 2 being a plan view. The socket part 6, which is set to the external electrode pin 3 of the electron gun 2 disposed in the neck part 1 of the color cathode ray tube and applies a high voltage to the cathode 4 of the electron gun 2, the third grid electrode 5, etc., is a conventionally known socket part 6. The structure is shown in a simplified manner. In the present invention, a magnet hold cover 8 having a built-in magnet 7 is integrally provided in the socket portion 6. The magnet 7 is attached to the neck portion 1 so as to apply a magnetic field to the electron emission side near the cathode 4 (the position of the third grid electrode 5 in the embodiment).
The magnet holding cover 8 is fixed to the magnet holding cover 8 by a magnet fixing stand 9. Practical strength of this magnet is 100 to 500 Gauss.

Next, to explain the operation when using a socket with such a configuration, since a magnetic field is applied above the cathode 4 by the magnet 7, the electrons emitted from the surface of the cathode 4 during the aging process are The linear trajectory is bent by the magnetic field generated by the magnet 7 in the middle of the trajectory. Therefore, even if the positive ions liberated inside the cathode ray tube are attracted along the electron trajectory, the direction of the positive ions' flight changes depending on the location where the electron trajectory is modified by the magnetic field, so the cathode It will be in a state where it does not directly dive into the surface of 4. Therefore, the surface of the cathode 4 formed of the barium oxide layer does not become rough and remains uniform and in good condition, so that the performance of the cathode ray tube does not deteriorate.

Next, we conducted an experiment on the aging of a color cathode ray tube using a conventional socket and a socket according to the present invention, and found that two types of sockets were used: one in which the strength of the magnet 7 was 350 Gauss, and the other in the present invention, in which the strength of the magnet 7 was 400 Gauss. With conventional sockets, the present invention has obtained much better results in terms of defects on the cathode surface than with conventional sockets, and when the socket of the present invention is used, the probability that the surface of the cathode 4 becomes rough is significantly reduced. Improved.

As is clear from the above explanation, when the aging process is performed using the socket of the present invention, positive ions do not jump into the cathode surface, so the cathode surface does not become rough and a color of excellent quality is produced. A cathode ray tube is obtained.

[Brief explanation of drawings]

The figures show an embodiment of a socket for a color cathode ray tube according to the present invention, with FIG. 1 being a sectional view and FIG. 2 being a plan view. 1...Network part, 2...Electron gun, 3...External electrode pin, 4...Cathode, 6...Socket part, 7...
Magnet, 8... Magnet hold cover.

Claims (1)

[Scope of Claims] 1. In a socket used by being set in a color cathode ray tube during the aging process in the color cathode ray tube manufacturing process, the socket is set to the external electrode pin 3 of an electron gun 2 disposed in the neck portion 1 of the color cathode ray tube. It consists of a socket part 6, a magnet hold cover 8 provided integrally with this socket part 6, and a magnet 7 having a strength of 100 to 500 Gauss fixed inside this magnet hold cover 8 by a magnet fixing base 9, When the external electrode pin 3 is set in the socket portion 6, the magnetic field of the magnet 7 is applied to the electron gun 2.
A socket for a color cathode ray tube, characterized in that the magnet 7 is disposed at a position given to the third grid 5 of the color cathode ray tube socket.