JPH01255136A - Convergence correcting device of cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide effective correction of a deflecting mag. field and enhance the working easiness in fitting and removal of a magnetic substance ring by fitting the magnetic substance ring in a ring shaped groove provided at the surface of a stop ring on a CP magnet. CONSTITUTION:A ring-shaped groove 24 is furnished to fit a magnetic substance ring 23 at the surface of stop rings 15a, 15b of a CP magnet 10 for convergence adjustment of a convergence correcting device. The inner dia. RA of this ring- shaped groove 24 is identical the inner dia. RA of the magnetic substance ring 23, while the outside dia. RB of the former 24 is greater than the outside dia. RC of the latter 23. When the ring 23 is to be mounted, therefore, fixation is attained without eccentricity from the center of the CP magnet 10. It is not required at this time to remove once the stop ring 15a and conceal in the CP magnet for performing fitting, but direct fitting can be made to the surface of the stop ring 15a. Accordingly the vertically deflecting mag. field 22 with the deflection yoke 9 varied is free from asymmetrical correction, and correction to the normal vertical deflecting mag. filed 20 is possible, and further installation at the time of correction becomes easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a convergence correction device provided in the neck of a color cathode ray tube.

[Conventional technology]

FIG. 2 shows a configuration diagram of a conventional color cathode ray tube. In the figure, numeral 1 is a color cathode ray tube, which is a cathode ray tube, and has a phosphor film 2 on its inner surface. 3 is a panel of a cathode ray tube, 4 is a funnel-shaped funnel connected to this panel 3, and 5 is a neck part. 6 is an electron gun that generates multiple electron beams, which is placed inside the neck part 5. 7 is a base that supplies voltage to operate the electron gun 6, and 8 is a shadow mask that selectively causes the electron beam emitted from the electron gun 6 to collide with the phosphors that emit light in each color forming the phosphor film 2. ,9
is a deflection yoke that deflects the electron beam to the required part. Reference numeral 10 denotes a convergence adjustment magnet (hereinafter referred to as a CP magnet), which is attached to the neck portion 5 so as to surround the electron gun 6.

FIG. 3 shows an enlarged view of the CP magnet 10, ila.

11b is a two-pole magnet, 12a and 12b are four-pole magnets, and 13n and 13b are six-stirring magnets. 14a to 14d are spacers interposed between the magnets, and retaining rings 15a,
Rotation of each magnet is prevented by tightening both ends with 15b. 16 is a screw for fixing the CP magnet 10 to the neck portion 5.

Next, work a will be explained. In order to produce an image on the panel 3'', the electron beam emitted from the electron gun 6 must be deflected by a deflection yoke 9, and must pass through the hole in the shadow mask 8 and correctly hit the phosphor on the phosphor film 2. . The upper 3aQ direction yoke 9 is composed of a horizontal deflection coil 17 and a vertical deflection coil 18, as shown in FIG. 4, and the vertical deflection coil 18 is formed in a toroidal shape with a core 19.

Further, due to its structure, the vertical deflection coil 18 generates a leakage magnetic field outside the deflection yoke 9 in addition to the magnetic field for vertically deflecting the electron beam, and is easily influenced by the external environment. As an example of this, as shown in FIG. 4, a normal vertical deflection magnetic field 20 is influenced by an external source, resulting in a changed vertical deflection magnetic field 22. As a result, the electron beam does not correctly hit the phosphor on the phosphor film 2.

Furthermore, as one means for correcting the changed vertical deflection magnetic field 22 shown in FIG. 4 to the normal deflection magnetic field 20, a magnetic ring 23 as shown in FIG. Ring 15a and spacer 14a or spacer 14
a and the two-pole magnet 11a, or the retaining ring 15a,
15b1 spacers 14a to 14d, 241 magnets 11a, llb.

4-pole magnet 12a, 12b, 64% magnet 13a
, 13b, a retaining ring 15a,
There is a method of fixing the tightening with 15b.

[Problem to be solved by the invention]

According to the conventional convergence correction device, for example, as shown in FIG. 7, the magnetic ring 23 is hidden and fixed within the CPli 1 stone 10, so the installation is unstable and asymmetry occurs in the vertical deflection magnetic field. Also, when attaching the magnetic ring 23, the retaining ring 15a must be removed once and then fixed again, resulting in problems in assembly workability.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a convergence correction device that can effectively correct the deflection magnetic field of a color cathode ray tube.

[Means to solve the problem]

The convergence correction device according to the present invention has CPPb0
An annular groove for mounting a magnetic ring is formed on the surface of the retaining ring.

[For production]

In this invention, since the magnetic ring is attached to the annular groove formed in the retaining ring, it is possible to prevent asymmetric correction when correcting the deflection magnetic field, and it is easy to attach and detach the magnetic ring to and from the annular groove. Go to.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a perspective view of the convergence correction device according to the invention, in which 10 is a CPPb0, 24 is a retaining ring 15
This is an annular groove formed on the surface of a, and a magnetic ring 23 is attached to this annular groove 24. Here, the annular groove 24
The inner diameter RA of the annular groove 24 matches the inner diameter RA of the magnetic ring 23, and the outer diameter RB of the annular groove 24 matches the outer diameter R of the magnetic ring 23.
c, and its size is not limited.

In this invention, since the inner diameter RA of the magnetic ring 23 and the inner diameter RA of the annular groove 24 match, when the ring 23 is attached, it can be fixed without being eccentric from the center of the CP magnet 10. When installing, there is no need to remove the retaining ring 15a and insert it hidden inside the CP magnet 10, but it can be inserted directly onto the surface of the retaining ring 15a.

With the above configuration, as shown in FIG. 4, the vertical deflection magnetic field 22 of the deflection yoke 9 that has changed can be corrected to the normal vertical deflection magnetic field of 2° without being asymmetrically corrected. Easy to install for correction.

〔Effect of the invention〕

As explained above, according to the present invention, since the magnetic ring is attached to the annular groove formed on the surface of the CPPb0 retaining ring, the deflection magnetic field can be effectively corrected. Further, the workability of attaching and detaching the magnetic ring can be improved.

[Brief explanation of the drawing]

1. FIG. 1 is a perspective view of a convergence correction device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional color cathode ray tube, FIG. 3 is an enlarged side view of CPPb0, and FIG. 4 is a perspective view of a deflection yoke. Figure 5 is an explanatory diagram of the vertical magnetic field of the deflection yoke influenced by the outside, Figure 6 is a front view of the magnetic ring, and Figure 7 is a front view of the conventional installation of the magnetic ring to the CP magnet. be. 5...Neck part, 10-CP magnet, lla, 1lb-
2li magnet, 12 a, 12 b-4i magnet, 13
a. 13 b - 6-pole magnet, 15a, 15b - retaining ring, 2
3... Magnetic ring, 24... Annular groove. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a convergence correction device that is attached to the neck of a cathode ray tube to correct the deflection magnetic field, an annular groove is formed on the center surface of the outer retaining ring that constitutes the convergence adjustment magnet, and a magnetic ring is inserted into this annular groove. A convergence correction device for a cathode ray tube, which is characterized by being installed.