JPS5829897Y2 - electromagnetic deflection yoke - Google Patents

Description

[Detailed description of the invention] In an electromagnetic deflection yoke for a cathode ray tube, in order to design the deflection yoke so that the magnetic field distribution of the horizontal coil or vertical coil optimizes the image characteristics, it is often necessary to change the winding distribution of the coil. It is being done.

In particular, a typical one is called a cosine distribution and is wound with wire segments of C08xθ.

However, when a core with a circular cross-sectional shape is used and cosine winding is used, a space is created between the core and the coil, resulting in poor deflection yoke efficiency, and the insulating separator is also troublesome.

On the other hand, according to Fink (Television Engineering Handbook), the deflection energy of the electromagnetic deflection yoke is expressed by the following equation.

WM=0.35310 'E X D a X Fβj
ouleE: High pressure (KV) Da: Core inner diameter (cm) Fβ
: Constant, meaning that the deflection energy is proportional to the core inner diameter.

Therefore, the present invention provides an electromagnetic deflection yoke that uses a core with a circular cross section and can realize a magnetic field distribution similar to a cosine distribution while reducing the space between the core and the coil.

Hereinafter, one implementation of the present invention will be described with reference to the drawings.

In FIG. 1, 1a, 1b, 2a, and 2b are horizontal coils, 3 is a separator, 4 is a vertical coil, and 5 is a ferrite core.

As is clear from FIG. 1, the inner diameter of the core is determined at points P1 to P4.

In other words, if it is possible to obtain a magnetic field distribution that is almost the same as a cosine distribution even if the winding angle of the electric wire is changed, the above problem can be solved.

An experimental example is shown below.

Here, the cross-sectional shape is large diameter a = 110 mm as shown in Figure 2.
Using a core 5 with a small diameter b = 60 mm and a length c = 50 mm, winding grooves were created at a pitch of 1.098° (328 windings at 360°), and each groove was numbered as shown in Figure 3. do.

First, as a conventional cosine distribution winding, the second to first
8,20,21,22,24,25°26.28,30
, 32, 36, 40, 42, and 50 grooves in the same direction, and current is passed through them in the same direction.

In this case, since the winding distribution is biased as shown in FIG. 4a, a space is created.

On the other hand, in the embodiment of the present invention, Nos. 2.4 and 6
,8,10,12,14,16,18,20,22,2
4,26,28°30.32,36.40;42.50
Winding in the same direction in each groove of No. 58, 62, 64, 66
．． Each of the grooves 68, 70, 72, 74, 76, and 78 was wound with a wire so that the current flowed in the opposite direction, and the two windings were connected.

The magnetic field distribution of this coil was almost the same as that of the conventional cosine distribution winding.

In this case, the winding distribution is uniformly connected as shown in Figure 4, but even if the winding angle is changed in this way, an ideal magnetic field distribution can be obtained.

As a specific implementation method, 1a of the horizontal coil in Fig.
, 1b, 2a, and 2b can be constructed as shown in FIG.

Moreover, it can also be implemented in the same way for vertical coils.

As described above, according to the present invention, since a uniform winding distribution can be realized, the inner diameter of the core can be reduced, efficiency can be improved, and the separator can be manufactured easily. be.

Moreover, it is particularly effective when using a printed coil or the like.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electromagnetic deflection yoke according to an embodiment of the present invention, Fig. 2 is a sectional side view of a core used in the yoke, and Fig. 3 is a sectional view of a core used in the yoke.
The figure is a diagram for explaining the winding, and FIG. 4 is a diagram for explaining the winding distribution. 1 a, 1 b, 2 a, 2 b...horizontal coil, 3...separator, 4...vertical coil, 5...core.

Claims (1)

[Scope of utility model registration request] In any one of the four regions that have a horizontal coil and a vertical coil and are divided by a horizontal deflection axis and a vertical deflection axis, the direction of the current flowing in a part of the electric wire of the horizontal coil or vertical coil in that region. An electromagnetic deflection yoke that makes the current flow in a different direction from the rest of the wire.