JPH0883576A - Deflection yoke - Google Patents

Abstract

(57) [Abstract] [Purpose] When a toroidal type V coil is used, an auxiliary coil can be arranged so as to give a degree of freedom of magnetic field distribution in the tube axis direction, and the deflection magnetic field of the main deflection part is partially A deflection yoke that can be changed to. A pair of saddle type horizontal deflection coils 1 and a pair of saddle type or toroidal type vertical deflection coils 2;
In the deflection yoke including the separator 3 for separating the two coils, a pair of saddle-type vertical deflection auxiliary coils 5 are provided inside the core of the deflection yoke in symmetrical positions in the horizontal deflection direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted and fixed on a cathode ray tube such as a television or a display for deflecting an electron beam emitted from an electron gun.

[0002]

2. Description of the Related Art FIGS. 6 and 7 are views showing a semi-toroidal structure of a deflection yoke, FIG. 6 is a side view of the deflection yoke,
FIG. 7 is a sectional view thereof.

As shown in these figures, a semi-toroidal deflection yoke includes a pair of saddle-type horizontal deflection coils (H coils) 1 and a pair of vertical deflection coils (toroidal type) wound directly around a core 4 in a spiral shape. It comprises a coil (V coil) 2 and a separator 3 for electrically separating the H coil 1 and the V coil 2. In FIG. 7, reference numeral 6
Indicates a gap between the core 4 and the separator 3.

Conventionally, as for the H coil, as described in JP-B-58-9541, another auxiliary coil is arranged in the vicinity of the window of the saddle type deflection coil so as to straddle the window. , A structure in which the deflection magnetic field of the main deflection portion of the saddle type deflection coil is partially changed, and complicated eswing (S-in
g) A degree of freedom is given to the magnetic field distribution so that misconvergence can be easily removed.

[0005]

However, in the prior art, when the toroidal V coil is used, no consideration is given to the arrangement of the auxiliary coil so as to give the degree of freedom of the magnetic field distribution in the tube axis direction. Therefore, the deflection magnetic field of the main deflection portion cannot be partially changed.

An object of the present invention is, when a toroidal V coil is used, enables the auxiliary coil to be arranged so as to give a degree of freedom of the magnetic field distribution in the tube axis direction, thereby partially deflecting the deflection magnetic field of the main deflection portion. It is to provide a deflection yoke that can be changed to

[0007]

In order to achieve the above object, the present invention provides a toroidal V coil with left and right portions having no winding, and a separator provided with protrusions when the core and the separator are assembled. By utilizing the gap that can be formed, the auxiliary coil can be arranged in the middle portion of the toroidal type V coil where there is no winding in the left-right direction.

[0008]

In the present invention, the toroidal V coil is provided with a non-winding portion on the left and right portions, and a separator is provided with a pointed protrusion so that the left and right gaps formed between the core and the separator have an auxiliary portion in the middle portion without winding. By arranging the coils, the deflection magnetic field in the tube axis direction formed by the toroidal V coil can be partially changed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a side view of the deflection yoke according to the first embodiment with the front core removed, and FIG. 2 is A of FIG.
FIG.

As can be seen from FIG. 2 showing a cross section taken along the line AA of FIG. 1, that is, a cross section perpendicular to the axis of the cathode ray tube, the toroidal type V coil 2 has no windings at the left and right positions when viewed from the surface of the cathode ray tube. Parts are provided. Further, the pointed projections 3a (see FIG. 1) of the separator 3 are provided at two positions on the left and right sides of the portion without the winding, and the core 4
Is in contact with An auxiliary coil 5 is arranged in a gap 6 formed at that time between the core 4 and the separator 3 at the left and right positions.

The auxiliary coil 5 is formed by winding and hardening a wire in advance. Further, in order to prevent the displacement of the auxiliary coil 5, an auxiliary coil positioning protrusion 7 is provided outside the separator 3, and the auxiliary coil positioning protrusion 7 forms a pair outside the auxiliary coil 5 as shown in FIG. It is provided.

FIG. 3 is a side view of the deflection yoke according to the second embodiment with the front core removed.

In this embodiment, the auxiliary coil positioning protrusion 7 is provided inside the auxiliary coil 5.

In the first and second embodiments, the pointed projection 3a is omitted and the auxiliary coil positioning projection 7 is used.
A gap between the separator 3 and the core 4 may be formed. FIG. 4 is a connection diagram of the toroidal vertical deflection coil and the auxiliary coil.

In this embodiment, as shown in the figure, a pair of toroidal V coil 2 and auxiliary coil 5 are connected in series, and a pair of them are connected in parallel, and magnetic flux in the same direction is generated as shown by the arrow. There is. As another connection method, a pair of toroidal vertical deflection coils 2 and auxiliary coils 5 connected in series may be connected in series to form magnetic flux in the same direction.

FIG. 5 shows an example of magnetic flux distribution in each cross section in the tube axis direction when the auxiliary coil 5 is arranged in the toroidal V coil 2.

When the auxiliary coil 5 is not arranged, the magnetic flux distribution in the entrance side area a on the entrance side of the electron beam, the main deflection area b, and the exit side area c on the image plane side is represented by a curve indicated by a solid line.

The vertical axis of the figure represents the difference in magnetic field strength between the central portion and the peripheral portion, the positive direction represents the pincushion magnetic field (pin magnetic field), and the negative direction represents the barrel magnetic field (barrel magnetic field).

Thus, the main deflection region has a strong pincushion type magnetic field distribution, as indicated by the peaks in the positive direction. In the case of the toroidal type V coil 2, if the winding distribution is changed in order to weaken the pinned magnetic field in the main deflection area b, the wires are generally wound in a radial manner, so that even in the entrance side area a and the exit side area c. It becomes a barrel magnetic field, and it is impossible to change the magnetic field partially.

On the other hand, when the auxiliary coil 5 is arranged as shown in the present invention, as shown by the dotted line, the peak of the main deflection region b can be lowered, and the strong pincushion type magnetic flux distribution is relaxed. It becomes a magnetic field and the convergence characteristics can be changed arbitrarily.

Although the V coil 2 is of the toroidal type in the above embodiment, the same can be said of the saddle type.

[0023]

As described above, according to the deflection yoke of the present invention, the deflection magnetic field is partially changed by disposing the auxiliary coil in the deflection yoke using the toroidal type or saddle type V coil. The degree of freedom can be set high, and it can be extremely effective in improving misconvergence and screen distortion.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a state in which a front core of a deflection yoke according to a first embodiment of the present invention is removed.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a partially sectional side view showing a state in which a front side core of a deflection yoke according to a second embodiment of the present invention is removed.

FIG. 4 is a connection diagram of a toroidal vertical deflection coil and an auxiliary coil.

FIG. 5 is an explanatory diagram of a magnetic field distribution divided in the tube axis direction of the toroidal vertical deflection coil.

FIG. 6 is a side view of a conventional deflection yoke.

FIG. 7 is a vertical sectional view of a conventional deflection yoke.

[Explanation of symbols]

 1 Saddle type horizontal deflection coil (H coil) 2 Toroidal type vertical deflection coil (V coil) 3 Separator 3a Pointed protrusion 4 Core 5 Auxiliary coil 6 Gap between core and separator 7 Auxiliary coil positioning protrusion

Claims (2)

[Claims] 1. A pair of saddle type horizontal deflection coils, and a pair of saddle type or toroidal type vertical deflection coils,
In a deflection yoke including a separator for separating the two deflection coils, a pair of saddle-type vertical deflection auxiliary coils are provided at symmetrical positions in the horizontal deflection direction inside the core of the deflection yoke. Deflection yoke. 2. The deflection yoke according to claim 1, wherein a protrusion for positioning the vertical deflection auxiliary coil is provided outside the separator.