JPH04106837U - deflection yoke - Google Patents

Abstract

(57) [Summary] (with modifications) [Purpose] The purpose of the present invention is to increase the amount of correction for coma aberration. [Structure] The present invention consists of a horizontal deflection coil that generates a horizontal deflection magnetic field distorted in a pincushion shape, a vertical deflection coil that generates a vertical deflection magnetic field distorted in a barrel shape, and
A coil separator that supports both vertical coils and has a cylindrical portion on the electron gun side, and a pair of magnetic pieces that magnetically couple with a portion of the vertical deflection magnetic field to generate an auxiliary vertical deflection magnetic field distorted into a pincushion shape. 5, each of the magnetic pieces 5 has a main surface portion 5a that faces each other via a vertical axis, and two branch portions 5b that are perpendicular to the main surface portion 5a and extend horizontally toward the cylindrical portion. In this deflection yoke, an auxiliary coil 6 is inserted into each of the branch portions 5b, and a vertical deflection current is passed through the auxiliary coil 6.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is mainly installed in a color picture tube equipped with an in-line electron gun. Generates a cushion-shaped horizontal deflection magnetic field and a barrel-shaped vertical deflection magnetic field. Regarding the deflection yoke.

0002

[Conventional technology]

Generally, the deflection yoke attached to a color picture tube equipped with an in-line electron gun is It includes a saddle-shaped horizontal deflection coil and a toroidal-shaped vertical deflection coil. and , the horizontal deflection coil usually generates a horizontal deflection magnetic field with a large pincushion distortion component. The vertical deflection coil generates a vertical deflection magnetic field with a large barrel distortion component. This can be achieved with a convergence configuration.

0003 However, as shown in Figure 2, the green light produced by the central electron beam Star G and red and blue rasters R and B generated by the electron beams on both sides are shown above. The disadvantage is that it tends to cause a so-called convergence coma that shifts at the bottom. It was. In addition, as shown in Figure 3, the beam spot due to the electron beam on both sides There was a drawback that rotational distortion (coma distortion) was likely to occur in r and b. Especially this frame Distortion can be caused by devices using large or wide-angle color picture tubes, or by raster images on the left and right sides of the screen. In the so-called pincushion-less system, which corrects distortion by adjusting the magnetic field distribution. It becomes something that cannot be ignored. These undesirable phenomena are caused by vertical deflection magnetism. This is related to the barrel-like distribution of the field, especially on the electron gun side, and especially on the left and right side of the raster. Pincushion the screen side of the vertical deflection magnetic field to correct pincushion distortion. A device that strengthens the barrel tendency on the electron gun side as a compensation for distorting the distribution. It appears conspicuously in Note that these distortions are collectively called coma aberration.

0004 In order to correct the above-mentioned coma aberration, conventionally, as shown in Japanese Patent Application Laid-Open No. 62-217546, A deflection yoke has been proposed. FIG. 4 shows this deflection yoke. In the same figure At the rear of the deflection yoke, there is a pincushion-shaped compensation device that picks up the leakage magnetic field of the vertical deflection magnetic field. It comprises magnetic pieces 1, 1 for generating an auxiliary vertical deflection magnetic field, which are placed on both sides of the vertical axis. The main surface parts 1a, 1a and the cylindrical shape of the coil separator 2 perpendicular thereto face each other. 2 extending horizontally toward the portion 2a and protruding toward the electron gun side along the outer surface of the cylindrical portion; It had two branch parts 1b, 1b. In addition, 3 is a vertical deflection coil, 4 is a toroidal It is the core.

[0005] Then, the vertical deflection magnetic field shown by the broken line arrow in Fig. 5 leaks from the core 4, and this leakage magnetic field Since the field is collected on each main surface portion 1a, 1a of the magnetic material pieces 1, 1, the solid line arrow in FIG. An auxiliary vertical deflection magnetic field with a pincushion-like distribution shown in is applied to the four branches 1b, 1b. Therefore, coma aberration is corrected by being generated on the electron gun side.

[0006]

[Problem that the idea aims to solve]

However, in the above method, the amount of coma aberration correction is determined by the amount of leakage magnetic field of the core. There is a limit to the amount of correction due to The picture tube had the drawback of insufficient coma correction.

[0007] The present invention overcomes the above drawbacks.

[0008]

[Means to solve the problem]

This invention is based on a horizontal deflection coil that generates a horizontal deflection magnetic field distorted into a pincushion shape. , a vertical deflection coil that generates a barrel-shaped vertical deflection magnetic field, and this horizontal and vertical deflection coil. A coil separator that supports both coils and has a cylindrical part on the electron gun side, and a vertical deflection magnet. An auxiliary vertical deflection field that is magnetically coupled to a portion of the field and distorted into a pincushion shape. It is equipped with a pair of magnetic material pieces that are generated, and each of these magnetic material pieces is opposed to each other via a vertical axis. a main surface part, and two parts perpendicular to this main surface part and extending horizontally toward the cylindrical part. In a deflection yoke having a branch part, An auxiliary coil is inserted into each of the branch parts, and a vertical deflection is applied to this auxiliary coil. It is a deflection yoke that is made by passing a current through it.

[0009]

[Effect]

This invention generates an auxiliary vertical deflection magnetic field by passing a vertical deflection current through the auxiliary coil. It can be distorted into a more pincushion shape.

0010

【Example】

An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a perspective view of the device of this embodiment. The same parts as those in the conventional example are designated by the same reference numerals, and the explanation thereof will be omitted.

[0011] In this embodiment, the magnetic pieces 5, 5 each have main surface portions facing each other via a vertical axis. and 5a, 5a, and two parts perpendicular to this main surface part and extending horizontally toward the cylindrical part. It has branch parts 5b, 5b. An auxiliary coil 6 is inserted into each of these branch parts. is included. Then, the auxiliary vertical deflection magnetic field is applied to this auxiliary coil 6. A vertical deflection current is applied in the direction of the cushion.

0012 Therefore, in the deflection yoke of this embodiment, the magnetic piece and the auxiliary coil work together to provide an auxiliary vertical The deflection magnetic field can be made more pincushion-like, resulting in larger coma aberration than before. A correction amount can be obtained.

[0013]

[Effect of the idea]

As mentioned above, according to the present invention, the amount of coma aberration correction can be increased compared to conventional methods. Therefore, it can also be used with color picture tubes that require a large amount of coma aberration correction.

[0014] In addition, the amount of correction can be easily adjusted by changing the number of turns of the auxiliary coil. I can do it.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a deflection yoke in one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a convergence coma.

FIG. 3 is an explanatory diagram of coma distortion.

FIG. 4 is a perspective view of a conventional deflection yoke.

FIG. 5 is an explanatory diagram of the same operation.

FIG. 6 is an explanatory diagram of the same operation.

[Explanation of symbols]

1, 5 Magnetic piece 3 Vertical deflection coil 4 Toroidal core 6 Auxiliary coil

Claims (1)

[Scope of utility model registration request] [Claim 1] A horizontal deflection coil that generates a horizontal deflection magnetic field distorted in a pincushion shape, a vertical deflection coil that generates a vertical deflection magnetic field distorted in a barrel shape, and an electron gun side supporting both the horizontal and vertical coils. a coil separator having a cylindrical portion, and a pair of magnetic pieces that magnetically couple with a portion of the vertical deflection magnetic field to generate an auxiliary vertical deflection magnetic field distorted like a pincushion. In a deflection yoke that has a main surface portion facing each other via a vertical axis and two branch portions that are perpendicular to the main surface portion and extend horizontally toward the cylindrical portion, an auxiliary coil is inserted into each of the branch portions. At the same time, a vertical deflection current is passed through this auxiliary coil to form a deflection yoke.