JPS63307648A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To design secure correction of peripheral distortion by arranging at least a pair of bar-like magnet for correcting peripheral distortion at diagonally opposing positions which are on a horizontal axis and on the outside surface of a frontal expanding portion of a coil bobbin. CONSTITUTION:The titled device is constituted with a core 2, a pair of horizontal deflection coil 3 and a vertical deflection coil 4 arranged along the core 2, and a coil bobbin 5 arranged between the horizontal and vertical deflection coils 3 and 4 and for holding and insulating the both coils 3 and 4. At least a pair of bar-like magnet 7 is provided for correcting peripheral distortion at diagonally opposite positions on a horizontal axis and on the outside surface of a frontal expanding portion 5A of the coil bobbin 5. Due to the magnetic field generated with the magnet 7, forces are applied at the right, left, upper and lower portions of a screen on an electron beam to smooth the drooping peripheral distortion. This makes it possible to securely correct the peripheral distortion.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to deflection yoke devices used in telepicture receivers, display devices, etc.
The present invention relates to a deflection yoke device for reducing peripheral distortion occurring in a type of cathode ray tube called a tube.

<Prior art> In general, in a deflection yoke device that is attached to a color cathode ray tube having three electron beams arranged in-line to deflect the electron beam, the horizontal deflection coil as a whole serves as a bin cushion magnetic field, and the vertical deflection coil serves as a barrel cushion magnetic field. The misconvergence can theoretically be reduced to zero by configuring it to create a magnetic field. However, in reality, it is difficult to obtain theoretical characteristics from the structure of the cathode ray tube and the structure of the deflection yoke device, and various types of misconvergence occur in reality.

On the other hand, as cathode ray tubes have become larger and flatter, SP tubes have come into widespread use. This sp tube is, for example, a standard tube consisting of a spherical surface with radius IR, and a
11!4! has a flat spherical surface with twice the radius of 2R! i-ray tube (
This is a cathode ray tube in which the central part of the screen has the shape of an FS tube, and the peripheral part of the screen has the spherical shape of a standard tube.

When a cathode ray tube is configured as an SP tube, the spherical shape at the top and bottom of the screen causes seagull-shaped distortion S called seagull distortion, as shown in Figure 5 (a). It is known.

Therefore, in the prior art, in order to correct this seagull distortion S, cross arms made of magnetic material or seagull distortion correction means made of correction magnets are installed above and below the enlarged front part of the deflection yoke. 30.31 was provided, and the Seagull distortion S was corrected by pulling it in the direction of arrow 32 in the figure so as to form a pincushion top barrel shape that occurs in the upper and lower center portions of the screen.

<Problems to be Solved by the Invention> However, when the Seagull distortion correction means 30.31 is used to correct the Seagull distortion S, as shown in FIG. Although the bin cushion distortion in the area is corrected to be flat, there is a problem in that drooping distortion remains at the left and right peripheral areas of the upper and lower positions of the screen, and at both left and right ends of the middle area.

The present invention has been made in view of the problems of the prior art, and is intended to solve the problem of seagull distortion peculiar to SP tubes, which occurs in the upper and lower periphery of the screen, or by cross arm and correction. It is an object of the present invention to provide a deflection yoke device that can reliably correct peripheral distortions that occur around the upper, lower, and middle portions of a screen when magnets are used.

Means for Solving the Problems> The deflection yoke device of the present invention has been made to solve the above problems, and includes a core, a pair of horizontal deflection coils and a vertical deflection coil provided along the core. , in a deflection yoke device consisting of a coil bobbin that is provided between a horizontal deflection coil and a superimposed deflection coil and that holds and insulates both coils, a diagonal position on the horizontal axis on the outer surface of the front enlarged part of the coil bobbin. and at least one pair of rod-shaped magnets for peripheral distortion correction.

At least one pair of rod-shaped magnets for peripheral distortion correction is installed on the outer surface of the front enlarged part of the coil bobbin at diagonal positions on the horizontal axis. A force is applied to the electron beam at the point where the peripheral distortion of the droop is flattened.

<Embodiment> Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, 1 is a deflection yoke main body, and the deflection yoke main body 1 includes a core 2 formed by joining semi-annular core members, and a pair of saddle-shaped parts arranged on the inner surface of the core 2. Horizontal deflection coils 3, 3, a pair of overlapping deflection coils 4.4 wound toroidally around the core 2, horizontal deflection coils 3, 3, and vertical deflection coils 4 arranged on the inner surface of the core 2. .4 and horizontal deflection coil 3.
, 3 and the overlapping deflection coils 4, 4, a coil bobbin 5 is formed by abutting a pair of half-split bobbins.
It is roughly composed of. A correction magnet 6.6 serving as Seagull distortion correction means is fixed to the upper and lower outer peripheral surfaces of the enlarged front portion 5A of the coil bobbin 5 constituting the deflection yoke main body 1. Here, each correction magnet 6 is
It has the same function as the Seagull distortion correction means 30 and 31 shown in FIG. On the horizontal axis of the enlarged front portion 5A of the coil bobbin 5, to which the correction magnet 6.6 as Seagull distortion correction means is fixed, a pair of rod-shaped magnets for peripheral distortion correction are located at diagonal positions on the horizontal axis, that is, on the left and right outer peripheral surfaces. 7.7 is provided perpendicular to the horizontal axis. The rod-shaped magnet 7.7 is magnetized with the polarity shown in FIG. 2, that is, with different magnetic poles facing each other, and is adhered to the outer peripheral surface of the front enlarged portion 5A of the coil bobbin 5, or is attached to the front enlarged portion 5A. Part 5
It is attached and fixed via a storage section (not shown) provided in A.

In the deflection yoke device having such a configuration, the operation when correcting the peripheral distortion 10 on the screen shown in FIG. 4(A) will be described below. As shown in FIG. 3, the lines of magnetic force ψ generated by the rod-shaped magnet 7 fixed on the outer peripheral surface of the front enlarged portion 5A of the coil bobbin 5 of the deflection yoke main body 1 are generated from the N pole of the rod-shaped magnet 7. If the magnetic force due to the lines of magnetic force ψ is B, the electron beam receives a downward force F1 at the bottom of the screen due to the magnetic force B, and
At the top of the screen, an upward force F2 is applied. Therefore, the electron beam is bent downward at the bottom of the screen and upward at the top of the screen by the force F1-F2, and the peripheral distortion 10 of the screen shown in FIG. 4(a) is corrected in the direction of the arrow. As shown in FIG. 4(b), a normal screen without peripheral distortion can be obtained. Here, in FIG. 3, numeral 1 indicates the direction of the current caused by the electron beam.

In one embodiment of the deflection yoke device of the present invention, a rod-shaped magnet for peripheral distortion correction is provided on the outer peripheral surface of the front enlarged part of the coil bobbin. As long as it is on the top, the installation position of the rod-shaped magnet is not limited to the example, and may be placed, for example, on the back side of the enlarged front part of the coil bobbin. Also,
The number of bar magnets installed is not limited to one pair (two),
The number can be increased as needed.

<Effects of the Invention> The deflection yoke device of the present invention has been described in detail above, and has the following effects.

In other words, the action of the magnetic lines of force generated by the bar magnet applies a force in the direction of correcting the peripheral distortion to the electron beam at the upper and lower peripheral areas of the screen, making it possible to reliably correct the peripheral distortion. , it is possible to always obtain good screen characteristics, and it is particularly effective when applied to SP tubes.

In addition, peripheral distortion can be corrected with a simple configuration using only a pair of rod-shaped magnets, and in addition, the rod-shaped magnet can be easily attached to the deflection yoke body, reducing costs and improving workability. It is.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the deflection yoke device of the present invention, FIG. 2 is a back view of FIG. Figure 4 (a) is an explanatory diagram showing the relationship between seagull distortion that shows the condition of peripheral distortion at the top and bottom of the screen and the correction means that corrects it, and Figure 5 (b) is the correction by the correction means. It is an explanatory view showing a subsequent state. 1... Deflection yoke body, 2... Core, 3.3...
Horizontal deflection coil, 4.4 Vertical deflection coil, 5...
・Coil bobbin, 5A...Front enlarged part, 7.7...
Keyaki test magnet,

Claims (1)

[Claims] A deflection device consisting of a core, a pair of horizontal and vertical deflection coils provided along the core, and a coil bobbin provided between the horizontal and vertical deflection coils to hold and insulate both coils. In the yoke device,
A deflection yoke device characterized in that at least one pair of rod-shaped magnets for peripheral distortion correction is provided on the outer surface of the front enlarged portion of the coil bobbin at diagonal positions on the horizontal axis.