JPS5842582B2 - deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke that is attached to the neck of a television picture tube and deflects an electron beam, and particularly to a deflection yoke for an in-line picture tube equipped with a saddle-shaped horizontal deflection coil.

In a so-called in-line picture tube in which the electron beam is arranged in a straight line, convergence is achieved by setting the deflection magnetic field from the horizontal deflection coil to have a slight bottle-cushion distribution tendency, and the deflection magnetic field from the vertical deflection coil to have a slight barrel distribution tendency. It is known that the error is minimized.

And in many cases - one efficiency is considered for horizontal deflection coils.
A lever-shaped coil is used.

The above-mentioned deflection yoke is based on the premise that the center axis of the deflection magnetic field is aligned with the center axes of the electron beams R, G, and B arranged on the -line.

However, in reality, there are structural variations caused by various errors associated with the manufacture of picture tubes and deflection yokes, so it is common that the picture tubes and deflection yokes do not match simply by being installed at a predetermined position on the neck. .

Therefore, in order to obtain an image with stable quality, it is necessary to make adjustments by some means to satisfy the above requirements.

In this case, especially as shown in FIG. 1, the electron beams R, G,
Horizontal deflection coils LR, L in which the direction of the magnetic field is perpendicular to the axis X on which B is arranged on a straight line, that is, in the axis Y direction.
When the central axis O' of the horizontal deflection magnetic field H due to
In other words, it will appear as □Sconvergence.

1 In Figure 1, the axis of symmetry of the horizontal deflection magnetic field H is X/Y.
/, then in the past, the deflection coil, that is, the deflection yoke itself, was moved up and down (Y direction) and left and right (X direction) with respect to the neck of the picture tube, that is, with respect to the central axis O of the electron beam. By fixing the deflection yoke at the best position through so-called swing adjustment, the influence of errors on the screen is minimized.

However, this method requires adjustment by mechanically moving the deflection yoke, which not only makes the adjustment complicated, but also requires a mechanism that allows the deflection yoke to be adjusted in swing and fixed at any adjustment position. This has the disadvantage that the structure is complicated and expensive.

Further, since the swing adjustment moves the deflection yoke itself, there is a problem in that adjustment to the horizontal deflection magnetic field also affects the vertical deflection magnetic field.

For this reason, a deflection yoke with a mechanism that can independently adjust the vertical and horizontal deflection coils has been proposed, but this is impractical due to its complicated structure.

In view of the above points, it has been put into practical use in some cases to perform the same adjustment as the head swing adjustment electrically.

This method was developed by focusing on the fact that each deflection magnetic field is formed by a pair of deflection coils.

That is, the axis of symmetry of the magnetic field is electrically moved by providing means for changing the ratio of currents flowing through the pair of deflection coils.

However, in principle, this method allows the axes of symmetry perpendicular to the direction of the magnetic field to coincide with each other (that is, to make the axis X' coincide with the axis X) for rectangular coils; It is not possible to adjust the axis of symmetry in the same direction as .

Therefore, even if axis X' coincides with axis
In the case of one case in the figure, the deflection magnetic field will appear on the TV screen as shown in Figure 2 because the strength of the magnetic field acting on one side beam will be stronger than the strength of the magnetic field acting on the other side beam. This causes an error h, that is, a misconvergence in the X-axis direction of the horizontal scan, which is generally referred to as an XH error.

As a method to electrically adjust this misconvergence, a method has recently been developed and put into practical use in which four correction coils are installed independently of the deflection coil and a four-pole correction magnetic field is used, but the structure is complicated. Needless to say, it is expensive.

The object of the present invention was made in view of the above-mentioned drawbacks of the conventional deflection yoke, and the object thereof is to provide an extremely simple structure in which the deflection magnetic field by the saddle-shaped deflection coil is symmetrical in parallel to the direction of the magnetic field. It is an object of the present invention to provide a deflection yoke configured so that the position of the shaft can be electrically adjusted.

In the deflection yoke according to the present invention, in a pair of saddle-shaped deflection coils that are disposed opposite to the neck portion of a picture tube with their longitudinal portions facing each other, at least one of the abutting portions or the An auxiliary conductor is placed near the deflection coil that runs approximately parallel to the longitudinal direction of the deflection coil, and the auxiliary magnetic field generated by passing a predetermined deflection current through the auxiliary conductor is used to differentiate the deflection magnetic field from the pair of saddle-shaped deflection coils from the magnetic field. It is characterized by adjusting the positions of parallel axes of symmetry.

Hereinafter, the present invention will be specifically explained using the drawings.

FIG. 3 is a drawing for explaining the present invention, and FIG.
The figure shows a sectional view taken along line Z2/ in figure a.

Figures c and d are diagrams for explaining the action of the auxiliary conductor A in the present invention.

Referring to the figure, the deflection coil "Hjhori" is a well-known saddle-shaped deflection coil consisting of a bundle of parallel conductor wires that substantially forms a deflection magnetic field when a deflection current flows. It is composed of sections 11, 12 and 21, 22, and front end sections 13, 23 and rear end sections 14, 24 that connect the longitudinal sections 11, 12 and 21, 22.

It has a hollow section 15.25 called a "window" formed by the longitudinal section and the front and rear ends.

In this specification, the window-side portion of the longitudinal portion will be referred to as the inner portion, and the portion on the opposite side will be referred to as the outer portion.

The above-mentioned deflection coil "H'W" has outer parts 11a and 12a of the longitudinal part 11.12 of the deflection coil, as shown in the drawing.
are arranged opposite to the neck 3 of the picture tube, facing the outer portions 21a, 22a of the longitudinal portions 21, 22 of the deflection coil grooves, respectively.

The auxiliary conductor A is placed at one mating portion of the deflection coil LH2LA, that is, approximately in the middle of the outer side portions 11a and 21a of the opposing longitudinal portions 11.21 of the deflection coil LHL group, and extends parallel to the longitudinal portion. It is located in

The auxiliary conductor A is substantially connected to the deflection coil L as described above.
It suffices to have a button at the abutting part of the H2 moat and a part that is almost parallel to the longitudinal part of the deflection coil, and it is possible to use a part of the conducting wire that constitutes the winding body as a whole. is also good.

The deflection yoke of the present invention uses an auxiliary magnetic field generated by passing a predetermined deflection current through the auxiliary conductor A to adjust the position of the symmetry axis parallel to the direction of the magnetic field of the deflection magnetic field produced by the deflection coils LH, L, and Q. It is something.

That is, when a deflection current is passed through the auxiliary conducting wire A arranged as described above, a magnetic field is generated around the conducting wire A by the current.

If the thickness of the housing conductor A is the same as the thickness of the deflection coil, and the intensity of the deflection current to be applied is equal to the magnitude of the deflection current to be applied to the deflection coil, then the auxiliary conductor A has a longitudinal section 11.21.
If a deflection current is passed in the same direction as , the magnetic field by the auxiliary conductor forms substantially the same field as one of the conductors forming the longitudinal section 11.21.

That is, substantially one conductor of the longitudinal part 11.21
The same effect as this increase is given to the deflection magnetic field H, and the strength of the magnetic field on the longitudinal portion 11.21 side of the deflection magnetic field H is increased.

In addition, on the contrary, the longitudinal part 11.21 is attached to the auxiliary ring MA.
If a deflection current is applied in the opposite direction, the magnetic field due to the auxiliary conductor cancels the magnetic field formed by one of the conductors forming the longitudinal section 11.21.

That is, it gives the deflection magnetic field H substantially the same effect as when the number of conducting wires in the longitudinal parts 11 and 21 is reduced by one, and reduces the strength of the magnetic field on the longitudinal part 11 and 21 side of the deflection magnetic field H. to do.

Therefore, as shown in FIG. 3C, the deflection coil beam, LA
The axis of symmetry Y' parallel to the magnetic field direction of the deflection magnetic field H is the axis X
) side, that is, the longitudinal part 11.
If the strength of the magnetic field on the 21 side is weaker than the strength of the magnetic field on the longitudinal part 12.22, apply a deflection current of an appropriate value to the auxiliary conductor A in the same direction as the longitudinal part 11.21. By flowing, an auxiliary magnetic field B is generated that strengthens the deflection magnetic field H,
The axis of symmetry Y' can be moved in the Y-axis direction.

Furthermore, as shown in Fig. 3d, the symmetry axis y/, which is parallel to the magnetic field direction of the deflection magnetic field by the deflection coils LH, L, and Q, is the axis X (→
If the strength of the magnetic field on the side of the longitudinal section 11.21 is stronger than that on the side of the longitudinal section 12.22, then 11.
By flowing a deflection current of an appropriate value in the opposite direction to 21, an auxiliary magnetic field B' is generated that weakens the deflection magnetic field H, and the axis of symmetry Y' can be moved in the Y-axis direction.

In the deflection yoke of the present invention, as shown in the above embodiment, the auxiliary conductor A is arranged at one abutment part of the saddle-shaped coil, and the fourth
As shown in the figure, by simply reversing the direction of the deflection current flowing through the auxiliary conductor A, it has sufficient practical advantages over the conventional deflection yoke without having to specially adjust the value of the deflection current flowing. However, if necessary, if you connect a variable inductance ■ in parallel to the auxiliary conductor A as shown in Figure 5 and configure it so that the magnitude of the current flowing through the auxiliary conductor A can be adjusted, more subtle adjustments can be made. becomes possible.

In this case, care must be taken not to adversely affect the deflection current flowing through the deflection coil itself when changing the value of the variable inductance.

In FIGS. 4 and 5, the auxiliary conductor A is shown by the symbol of a coil, but its form is not limited to a coil as long as it functions as described above.

In this case, the auxiliary conductor A is simply indicated by the symbol of a coil, focusing on the point that the magnetic field generated by a current flowing through the conductor A is utilized.

Further, in the same figure, a deflection current source is shown.

In the above embodiment, the auxiliary conductor A is arranged at one mating part of the deflection coil, and the direction of the current flowing through the auxiliary conductor A is reversed to make the adjustment. The direction of the current can be reversed by placing it not only at the abutting part of IL 21 but also at the abutting part of longitudinal parts 12 and 22, and using either auxiliary conductor according to the necessary adjustment. You can make the same adjustments without any trouble.

Furthermore, in this case, differentially using both auxiliary conductors,
That is, if both conductive wires are switched and adjusted so as to give the same effect, the range of adjustment becomes wide and delicate adjustment is also possible.

In the above embodiment, the auxiliary conductor A was placed at the abutting part of the deflection coil, but in practical use, the magnetic field caused by the auxiliary conductor is sufficient to increase the deflection magnetic field to achieve the purpose of the present invention. It is clear that it may be placed near the abutting portion as long as it has a positive effect.

As explained above, in the deflection yoke of the present invention, an auxiliary conductive wire is arranged approximately square in the longitudinal direction of the saddle-shaped deflection coils at or near the abutting portion of the pair of saddle-shaped deflection coils. With an extremely simple configuration that only requires a predetermined deflection current to flow through the
The position of the axis of symmetry parallel to the magnetic field is electrically adjusted.

Therefore, not only the above-mentioned drawbacks of the conventional deflection yoke are solved, but when used in conjunction with the adjustment method of the conventional deflection yoke, it becomes possible to make more accurate and subtle adjustments over a wide range, and to achieve superior quality. This is extremely effective as a means of easily obtaining a screen.

In addition, when specifically assembling the deflection yoke of the present invention,
The auxiliary conductor should be placed firstly by gluing and fixing it to the inside of the deflection coil, that is, the part marked A in Figure 3, and secondly to the butting part of the deflection coil, that is, the part marked A in Figure 3. In the mouth part of the housing, a deflection coil is inserted and fixed to a bobbin that supports LA, and a bobbin and a toroidal coil are installed in the third part of the housing, that is, the part facing the outside of the deflection coil, that is, the part facing the window in Figure 3. In the past, the conductor wire could be fixed by making grooves in the core between the cores to lock the conductor wire, or by winding the conductor wire once or several times around the core whose inside is almost parallel to the longitudinal direction of the deflection coil. There are ways to think about it.

Among the above methods, the method of implanting the conductive wire in the second bobbin is excellent in the construction of the deflection yoke, but has the disadvantage that the construction is somewhat complicated.

Furthermore, although the first adhesive method is the simplest, there are problems with the means for arranging and holding the conducting wire in a predetermined position.

The third method is considered to be appropriate for arranging the auxiliary conductor, but when the conductor is wound around the core 4 as shown in FIG. It is necessary to consider the influence that the magnetic field caused by A and the magnetic field caused by the conducting wire A' placed outside the core 4 have on the vertical deflection coil.

[Brief explanation of drawings]

Fig. 1 is a drawing for explaining the deflection magnetic field H caused by the deflection coils LH, L, ; Fig. 2 is the symmetry axis Y' of the deflection magnetic field H.
Fig. 3 is a drawing for explaining the present invention, and Fig. a shows the effect of the deflection magnetic field on the TV screen when Drawings showing the positional relationship between the mold coil and the auxiliary conducting wire, Figure b is a cross-sectional view of line zz' in Figure A, Figures c and d are,
Drawings for explaining the action of the auxiliary conductor in the present invention,
4 and 5 are drawings showing an example of electrical connection between the auxiliary conducting wire, the deflection coil and the deflection current source, and FIG. 6 is a drawing showing a specific example of the arrangement of the auxiliary conducting wire. In the figure, 斃 and Hori are the hollow-shaped deflection coils, A is the auxiliary conductor, 3 is the neck of the picture tube, 4 is the core, R, G. B represents an electron beam, EH represents a deflection current source, and LX represents a variable inductance.

Claims (1)

[Claims] 1. In a deflection yoke having a pair of saddle-shaped deflection coils disposed opposite to the neck portion of the picture tube with their longitudinal portions facing each other, at least one of the pair of saddle-shaped deflection coils An auxiliary conductor is placed at or near the abutting portion of the neck-shaped deflection coil, and the auxiliary conductor is placed approximately parallel to the longitudinal direction of the above-mentioned saddle-shaped deflection coil, and the auxiliary magnetic field generated by passing a predetermined deflection current through the auxiliary conductor leads to the above-mentioned A deflection yoke characterized in that it is configured to adjust the position of an axis of symmetry in a direction parallel to the magnetic field of a deflection magnetic field produced by a pair of saddle-shaped deflection coils.