JPH0535556Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a deflection yoke.

[Conventional technology]

Figure 2 shows a CRT manufactured using conventional technology.
FIG. 3 is an assembly diagram of a deflection yoke. The main components of the CRT are the panel surface 1 and the electron gun 2. The main components of the deflection yoke are a shield ring 3, a coil 4, two centering magnets 5, and two focus magnets 6.

Electrons emitted from the electron gun 2 are focused on the panel surface 1 by a focusing lens formed by the magnetic fields of the two focus magnets 6.

[Problem that the invention attempts to solve]

It is very difficult to make the electron gun 2 perpendicular to the panel surface 1, and the electrons emitted from the electron gun 2 may not fly to the center of the panel surface 1 due to the inclination of the electron gun 2. I can't go. Therefore, the electrons do not pass through the center of the focusing lens formed by the two focus magnets 6, but instead pass through the ends of the focusing lens formed by the two focus magnets 6.

The focusing lens formed by the two focus magnets 6 is formed by passing the electrons slightly away from the center.
Under the slight influence of the magnetic field created by
Aberrations appear in the image projected on the panel surface 1.

It is also considered that focus magnets manufactured by conventional techniques are magnetized uniformly to make the focusing lens formed by the two focus magnets 6 uniform, thereby eliminating aberrations. However, according to the conventional technology, it is difficult to make the focus magnet uniform. Therefore, the closer to the ends of the focusing lens formed by the two focus magnets 6, the more likely the magnetic field is distorted and the more aberrations appear.

However, as a method of removing aberrations using the prior art, by rotating the focus magnet 6, the center of the focusing lens formed by the two focus magnets 6 is aligned as much as possible with respect to the inclination of the electron gun 2. However, if the inclination of the electron gun 2 becomes large, it becomes very difficult to eliminate aberrations using the conventional focus magnet 6.

Therefore, the number of man-hours required to adjust the aberrations becomes considerably large. Furthermore, even if the aberrations are adjusted, depending on the inclination of the electron gun 2, the aberrations cannot be removed, resulting in a reduction in the yield of CRTs.

[Means for solving problems]

In order to solve the above problem, in the present invention, in a deflection yoke having at least a centering magnet, a focus magnet, a shield ring, and a coil, one side of the focus magnet is made eccentric so that the magnetic flux distribution of the focus magnet is eccentric. I made it diagonal.

〔Example〕

FIG. 1 is a configuration diagram of a deflection yoke and a CRT that are an embodiment of the present invention. The main components of the CRT, the panel surface 1 and the electron gun 2, are the same as before. Also in the deflection yoke, the shield ring 3, coil 4, and centering magnet 5 are the same as the conventional ones.

In this embodiment, one side of one of the two conventional focus magnets 7 is shaved obliquely.

Like the focus magnet 7, by cutting one side, it is adjusted so that the electrons emitted by the electron gun pass through the center of the focusing lens formed by the focus magnet 7.

Also, by obliquely cutting one side of one focus magnet, the focusing lens becomes larger.
Therefore, electrons do not pass through the portion where the magnetic field formed by the two focus magnets 7 is likely to be distorted.

[Effect of idea]

As explained above, according to the present invention, the image projected on the CRT panel surface is clear and free of aberrations.

Since the center position of the focusing lens formed by the focus magnet is moved, aberration adjustment is easier than with the conventional deflection yoke.

Due to the ease of aberration adjustment, the number of adjustment steps can be reduced.

By realizing the above, it was possible to improve the overall image quality.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a deflection yoke and a CRT that are an embodiment of the present invention. FIG. 2 is an assembly diagram of a deflection yoke and a CRT manufactured by the prior art. 1... Panel surface, 2... Electron gun, 3... Shield ring, 4... Coil, 5... Centering magnet, 6, 7... Focus magnet.

Claims (1)

[Scope of utility model registration request] A deflection yoke comprising at least a centering magnet, a focus magnet, a seedling ring, and a coil, characterized in that one side of the focus magnet is inclined so that the magnetic flux distribution of the focus magnet is eccentric.