JPH03112038A - Deflection yoke - Google Patents

Abstract

PURPOSE:To suppress the leakage magnetic field generated by horizontal deflecting coils with a simple structure by inclining respective large-diameter side bend-up sections of a pair of mating saddle type horizontal deflecting coils toward the fluorescent screen side. CONSTITUTION:A pair of mating saddle type horizontal deflecting coils 3 and 4 are fitted on the inside of an insulating frame 1. A circular magnetic core 2 is fitted on the outside of the insulating frame 1. A saddle type vertical deflecting coil 5 is pinched between the insulating frame 1 and the magnetic core 2. The large-diameter side bend-up section 7 of the coil 3 is inclined by the angle against the vertical axis 14 so as to be prostrated toward the fluorescent screen side as a whole. Since large-diameter side bend-up sections 7 of both coils 3 and 4 are inclined, the magnetic field generated by both bend-up sections 7 is faced to the direction of the center axis 13, the magnetic field can be suppressed from jumping out to the outside from the large-diameter section of a deflection yoke, and unnecessary radiation can be reduced.

Description

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

2. Related Art Conventionally, a saddle-shaped coil as shown in FIG. 7 has often been used as a horizontal deflection coil for a deflection yoke. In FIG. 7, 26 and 27 are straight parts, 28 is a bend-up part provided in the large diameter part on the phosphor screen side, and 29 is a bend-up part provided in the small diameter part of the electron gun example.

Problems to be Solved by the Invention However, when a saddle type horizontal deflection coil having such a configuration is used, it is inevitable that a portion of the magnetic field generated by the deflection coil leaks to the outside of the deflection yoke. In particular, as shown in Figure 9, the magnetic field is thick near the large-diameter part of the horizontal deflection coil (a phenomenon that jumps out to the outside occurs).Moreover, the magnetic field is caused by the sawtooth wave flow flowing through the horizontal deflection coil, and is short. Since the direction of the magnetic field reverses within a certain period of time, once the magnetic field jumps out, it cannot return and is emitted as electromagnetic waves, leading to the generation of unnecessary radiation.Especially for large cathode ray tubes, unnecessary radiation is generated. The radiation was very strong.

The present invention has been made in view of such problems,
It is an object of the present invention to provide a deflection yoke that can suppress leakage magnetic fields and reduce unnecessary radiation with a very simple configuration.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention adopts a configuration in which the large-diameter side hand-ass parts of a pair of saddle-shaped horizontal deflection coils facing each other are both tilted toward the phosphor screen side.

Effect As described above, by slanting the large-diameter side bend-ups of both saddle-shaped horizontal deflection coils, the direction of the magnetic field generated by both of these bend-up portions is directed toward the central axis. This suppresses the magnetic field that tends to fly outward from the large diameter portion of the deflection yoke.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is a perspective view of the deflection yoke in this embodiment. In FIG. 1, 1 is an insulating frame, 2 is a magnetic core mounted on the outside of the insulating frame 1, and 3 and 4 are saddle-shaped horizontal deflection coils mounted on the inside of the insulating frame 1. 5 is a saddle-shaped vertical deflection coil. The vertical deflection coil is sandwiched between the insulating frame 1 and a magnetic core mounted on the outside thereof.

FIG. 2 is a perspective view of the same deflection yoke with only the horizontal deflection coil 3 taken out. In FIG. 2, 6 is a bend-up portion on the small diameter side of the horizontal deflection coil 3, and 7 is a bend-up portion on the large diameter side.

The entire bend-up portion 7 is tilted toward the phosphor screen. 13 represents the central axis of this deflection yoke, 14 represents a vertical axis perpendicular to the central axis 13, and θ represents the inclination of the bend-up portion 7, that is, the angle that the surface of the bend-up portion 7 makes with the vertical axis 14 of the deflection yoke. By the way, FIG. 7 shows a conventional horizontal deflection coil, in which the surface of the bend-up portion 28 is approximately perpendicular to the central axis 13 of the deflection yoke.

FIG. 3 is an explanatory diagram showing the state of the magnetic field when only the horizontal deflection coil of the deflection yoke of this embodiment is taken out and a current is applied. By slanting the large-diameter side bend-up 7 of the saddle-shaped horizontal deflection coil 3 in this manner, the direction of the magnetic field generated by this bend-up portion 7 in the A portion is both directed toward the central axis. FIG. 8 shows the state of the magnetic field of a conventional saddle-type horizontal deflection coil for comparison. In this example, the bend-up portion 7
The magnetic field generated by this direction is approximately parallel to the central axis.

Therefore, such a configuration cannot be expected to suppress the magnetic field that tends to escape from inside the deflection yoke.

FIG. 4 is an explanatory diagram showing the horizontal deflection magnetic field in the operating state of the deflection yoke of this embodiment. Reference numeral 8 denotes a bend-up portion of the other horizontal deflection coil, that is, the larger diameter side of the horizontal deflection coil 4. That is, as shown in the figure, for example, the magnetic core 2
The magnetic field that exits from the upper part of the magnetic core 2 and passes through the upper bend-up portion 7 returns to the magnetic core 2 through the lower bend-up portion 8 without protruding outward to a large extent. Furthermore, the ninth
The figure is an explanatory diagram showing the horizontal deflection magnetic field in the operating state of a conventional deflection yoke. In this way, conventionally, the magnetic field E that comes out from the upper part of the magnetic core 22 and passes through the upper bend-up part 28 protrudes outward to a large extent. becomes.

FIG. 5 is a perspective view showing an example in which a canceling coil is added to the deflection yoke of this embodiment, and the addition of the canceling coil in this way further increases the effect of suppressing unnecessary radiation.

FIG. 6 is a perspective view of only the horizontal deflection coil of the deflection yoke in another embodiment. In this embodiment, bent portions 9 and 10 are formed at the bend-up portion on the large diameter side, and only the upper portions of these bent portions 9 and 10 are tilted toward the phosphor screen side.

Effects of the Invention As described above, in the present invention, by slanting both large-diameter side bend-ups of the saddle-shaped horizontal deflection coil, the direction of the magnetic field generated by both of these bend-up portions is directed toward the central axis. This suppresses the magnetic field that tends to flow outward from the large-diameter portion of the deflection yoke. Therefore, with a very simple configuration, it is possible to suppress the leakage magnetic field generated by the horizontal deflection coil, and unnecessary radiation can be reduced, which has a great effect.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a deflection yoke according to an embodiment of the present invention, Fig. 2 is a perspective view of the same deflection yoke with only the horizontal deflection coil taken out, and Fig. 3 is a perspective view of the horizontal deflection coil of the same deflection yoke. An explanatory diagram showing the state of the magnetic field when it is taken out and a current is applied. Figure 4 is an explanatory diagram showing the horizontal deflection magnetic field in the operating state of the same deflection yoke. Figure 5 is an explanatory diagram showing the horizontal deflection magnetic field in the operating state of the same deflection yoke. Figure 5 shows the addition of a canceling coil to the deflection yoke of this example. FIG. 6 is a perspective view of a deflection yoke in another embodiment with only the horizontal deflection coil taken out, and FIG. 7 is a perspective view of a conventional deflection yoke with only the horizontal deflection coil taken out. figure,
Fig. 8 is an explanatory diagram showing the state of the magnetic field when the horizontal deflection coil of the conventional deflection yoke is taken out and a current is passed through it, and Fig. 9 is an explanatory diagram showing the horizontal deflection magnetic field in the operating state of the conventional deflection yoke. . 1...Insulating frame 2...Magnetic core 3.4...Horizontal deflection coil 5...Vertical deflection coil 6...Bend up section 7...Bend up section

Claims (1)

[Scope of Claims] A vertical deflection coil, a pair of saddle-shaped horizontal deflection coils facing each other, an annular magnetic core installed to cover the horizontal deflection coil and the vertical deflection coil, and the horizontal deflection coil. A deflection yoke characterized in that both large-diameter side bend-up portions are tilted toward the phosphor screen side.