JPH04196034A - Deflection yoke - Google Patents

Abstract

PURPOSE:To obtain a picture with no misconvergence by opposedly arranging two sheets of T-shaped magnetic material piece in the vicinity of a deflection yoke, in the neck part of an in-line type color picture tube. CONSTITUTION:Two sheets of T-shaped magnetic material piece 1 are arranged in mutually opposed upper and lower positions at an interval of a distance (t) on the electron gun side of a deflection yoke 3 mounted to a color picture tube 2. Here in the magnetic material piece 1, its T shape has a size of length l1 in the horizontal direction and length l2 in the vertical direction. Accordingly, by arranging the magnetic material pieces 1 in mutually opposed upper and lower positions further by suitably selecting the size of the magnetic material piece 1, deflection sensitivity in the center part of a green color electron beam can be adjusted. That is, deflection sensitivity of a center beam can be adjusted in the horizontal direction by suitably choosing the length l1 and in the vertical direction by the length l2, of the magnetic material piece 1. In this way, a picture of no misconvergence with mutually agreeing rasters of three primary colors R, G, B can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a deflection yoke installed in a cathode ray tube used in a television receiver or the like.

Conventional technology In recent years, the deflection yoke used in color picture tubes uses saddle-shaped windings for the horizontal deflection coil, which creates a pincushion-shaped magnetic field distribution, and uses toroidal-shaped windings for the vertical deflection coil. 21\7 The resulting magnetic field distribution is barrel-shaped, and the use of in-line deflection coils for color picture tubes, in which the horizontal deflection coil and the vertical deflection coil themselves are self-convergent, has become mainstream. .

Conventionally, in the deflection yoke of this type of color picture tube, in order to correct misconvergence caused by variations in windings, etc., a green beam beam was placed in the center of three electron guns arranged in-line. In order to correct the deflection sensitivity of the electron gun, a field controller pole piece (hereinafter abbreviated as FC) (f
-There are two installed above and below. Furthermore, as shown in FIG. 3, one FC is arranged around the blue and red electron guns so as to shield each electron gun.

By correcting the deflection sensitivity of the three electron beams emitted from the three electron guns by the FC, an image 3 without misconvergence in the vertical and horizontal directions of the display image projected on the face of the color picture tube. − The structure is such that it can be obtained.

Problems to be Solved by the Invention In the deflection yoke used in such conventional in-line color picture tubes, the above-mentioned FC is sealed inside the color picture tube, and small size and precise dimensional accuracy are required. Moreover, depending on the accuracy of the mounting position, the deflection sensitivity of the center beam for green color in particular tends to vary, which causes misconvergence.

The present invention solves the above-mentioned problems, which occur due to differences in the mounting positions of field controllers (FC).
The purpose is to correct the deflection sensitivity of the center beam and eliminate misconvergence.

Means for Solving the Problems In order to achieve the object described in item 1, the present invention provides two opposing T-shaped plates on the deflection yoke side near the periphery of the electron gun disposed in the in-line color picture tube. It has a structure in which magnetic pieces are arranged above and below.

Effects of the present invention With the above-described configuration, by appropriately selecting the sizes of the two magnetic pieces fixed to the deflection yoke, the deflection feeling jW of the center beam for green color can be particularly sharpened, and misconvergence can be eliminated. It is something that can be done.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, on the electron gun side of the deflection yoke 3 attached to the Züyler iron receiving tube 2,
Two T-shaped magnetic pieces 1 are placed opposite each other in the lower position.
They are arranged at intervals of a distance t.

As shown in FIG. 1, the magnetic piece 1 is T-shaped and has a horizontal length of 4. and has a length e2 in the vertical direction.

The magnetic material pieces 1 are arranged in upper and lower positions opposite to each other,
By appropriately selecting the size of the magnetic piece 1, magnetic fields are generated for the vertical lines as shown in FIG. 4 and for the horizontal lines as shown in FIG. 6, respectively. The deflection sensitivity of the center part of the green electron beam can be adjusted. That is, 1 of the magnetic piece 1:! The deflection sensitivity of the center beam in the horizontal direction can be adjusted by appropriately selecting the length of the center beam, and the deflection sensitivity of the center beam in the vertical direction can be adjusted by the length of the center beam. R), if the green (G) raster deviates from the f(B) raster, the sixth
As shown in Figure (b), an image without misconvergence in which the rasters of the three primary colors R1G and H match is produced.

Effects of the Invention As is clear from the above embodiments, the deflection yoke of the present invention can simultaneously adjust the deflection sensitivity of the center beam in the vertical and horizontal directions of the green electron beam. Alternatively, by appropriately selecting the material or the arrangement distance t, a deflection yoke without misconvergence can be provided.

4. Explanation of Fig. il'+-i Fig. 1 is a sectional view of a deflection yoke according to an embodiment of the present invention viewed from the electron gun side, and Fig. 2 is a sectional view of a deflection yoke attached to a color picture tube. 3 is a conceptual diagram showing the arrangement of field controllers, FIG. 4 is a state diagram showing an example of the horizontal coil neck rear magnetic field according to the present invention, and FIG. 5 is a vertical coil neck rear magnetic field according to the present invention. A state diagram showing an example, FIG. 6(a) is a misconvergence pattern diagram before the magnetic material piece is attached, FIG.
Figure (b) shows misconvergence (1) 7z after settling down.
This is a pattern diagram.

1... Magnetic piece, 2... Color picture tube, 3 Deflection yoke.

Name of agent: Patent attorney Akira Okaji and two others Figure 1 Figure 3 F (.

Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A deflection yoke of a self-convergence type in-line color picture tube in which the magnetic field distribution by the horizontal deflection coil has a pincushion shape and the magnetic field distribution by the vertical deflection coil has a barrel shape, and the in-line color picture tube described above. A deflection yoke comprising two T-shaped magnetic pieces disposed opposite to each other in the neck portion of the deflection yoke in the vicinity of the deflection yoke.