JPH0448617Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a deflection yoke that aims to reduce the level of unnecessary radiation.

[Conventional technology]

For example, West German VDE (Verband Deutscher)
The unnecessary radiation regulation frequency required by the (Elektorotechniker) standard is 10KHz or higher, and unnecessary radiation generated by horizontal deflection current becomes a problem in cathode ray tube display devices.

Unnecessary radiation is caused by the deflection yoke through which the horizontal deflection current flows, the flyback transformer, the horizontal width adjustment coil,
This is caused by the leakage magnetic field of the horizontal linearity adjustment coil, and of the amount of unnecessary radiation to the outside, the deflection yoke accounts for approximately 70%, and the flyback transformer accounts for approximately 20%.
%, and horizontal width adjustment coils account for approximately 10%.

FIG. 5A is a side view of the deflection yoke 1, with the core 1a
Only the horizontal deflection coil 1b is shown. Figure B is a front view of only the horizontal deflection coil 1b seen from the front side, that is, from the funnel side of the cathode ray tube 2. When a horizontal deflection current flows through the horizontal deflection coil 1b, at a certain moment it moves in the direction indicated by the dashed arrow. A magnetic field is generated. In this case, within the space surrounded by the core 1a, there is a horizontal deflection magnetic field 6c in the vertical direction.
occurs, and at the same time leakage magnetic fields 6 are generated in the front and rear crossover portions 1c and 1d of the horizontal deflection coil 1b, respectively.
a and 6b are generated and radiated to the external space.

FIG. 6 is a partial perspective view of a cathode ray tube display device equipped with a conventional unnecessary radiation prevention device, showing the deflection yoke 1 attached to the cathode ray tube 2 and sources of unnecessary radiation such as a flyback transformer (not shown). It is surrounded by a housing 3, a heat sink 4, and a cover 5 made of a highly conductive metal plate or magnetic material, and by trapping the leakage magnetic field inside, the level of unnecessary radiation to the outside is reduced. .

[Problem that the invention attempts to solve]

Conventional unnecessary radiation prevention devices have a structure in which the source of unnecessary radiation is surrounded by a magnetic shielding plate, which not only imposes significant restrictions on the structure of the display device, but also has the problem of poor heat dissipation from the device.
Another problem was that the cost was high.

This invention was made to solve the above problems, and without surrounding it with a magnetic shielding plate,
The purpose is to easily produce a deflection yoke with a low level of unnecessary radiation.

[Means for solving problems]

The deflection yoke according to this invention has a coil side formed along a crossover wire portion of the horizontal deflection coil, and includes a canceling coil for canceling a leakage magnetic field generated from the crossover wire portion, and includes a canceling coil for canceling a leakage magnetic field generated from the crossover wire portion. The reverse winding coil section connected to the end of the winding is configured as the above-mentioned canceling coil.

[Effect]

In this invention, the leakage magnetic field generated from the horizontal deflection coil crossing wire portion is canceled by the magnetic field generated at the coil side of the cancellation coil, so that the unnecessary radiation level of the deflection yoke can be reduced.

In particular, since the cancellation coil is coupled to the horizontal deflection coil, it is easy to manufacture and the installation of the cancellation coil is also improved.

[Example of idea]

Embodiments of this invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of essential parts of an example of a deflection yoke according to this invention, with the separator and vertical deflection coil removed.

In the figure, 7 indicates 3 to 3 of the horizontal deflection coil 1b.
This canceling coil is wound in a hollow shape with a number of turns of 10% and is almost similar to the horizontal deflection coil 1b. Both coil sides 7a,
7b. This cancellation coil 7 is connected in series to the horizontal deflection coil 1b, for example, as shown in FIG. A straight portion 7c formed by a coil side between both coil sides 7a and 7b is arranged in a posture extending in the axial direction along the outer surface of the core 1a.

As shown in FIG. 3, the cancellation coil 7 is constituted by a reversely wound coil section connected to the winding end of the horizontal deflection coil 1b. That is, for example, a horizontal deflection coil 1b is created by winding an electric wire a predetermined number of times in a clockwise direction, and further, in this winding process, the winding end of the horizontal deflection coil 1b is further counterclockwise to approximately the shape of the horizontal deflection coil. By winding the coil along the same direction a predetermined number of times, this counterclockwise wound coil portion is created as the cancellation coil 7. Thereafter, both coils 1b and 7 are deformed into a predetermined saddle shape and attached to a separator described below.

4A and 4B show how the cancellation coil 7 is installed. In the figure, 8 is a vertical deflection coil, 10 is a separator, and horizontal deflection coil 1
It has front and rear flange parts 10a and 10b that cover the front and rear crossing line parts 1c and 1d of b. The cancellation coil 7 is attached to the separator 10 on the same surface as the horizontal deflection coil 1b. The attachment means may be selected from various methods such as adhesion.

In the above configuration, when a horizontal deflection current is applied to the horizontal deflection coil 1b, leakage magnetic fields 6a and 6b are generated from the front and rear crossing line portions 1c and 1d of the horizontal deflection coil 1b, as shown by the broken line arrows in FIG.
However, since the horizontal deflection current is also applied to the canceling coil 7, the leakage magnetic fields 6a, 6b are applied to both the front and rear coil sides 7a, 7b of the canceling coil 7.
Magnetic fields 9a, 9a are generated in the direction of canceling the . As a result, the leakage magnetic fields 6a and 6b are reduced,
Unnecessary radiation level can be reduced.

By the way, if the cancellation coil 7 and the horizontal deflection coil 1b are made separately, the number of manufacturing steps will increase and the mounting on the separator 10 will have to be done separately, resulting in a decrease in productivity.

However, in the above configuration, the horizontal deflection coil 1b
Since the canceling coil 7 is manufactured integrally when winding the separator 10, the manufacturing process is reduced, and the separator 10
There is an advantage that the attachment to the horizontal deflection coil 1b can be carried out at the same time as the attachment of the horizontal deflection coil 1b.

[Effect of idea]

As described above, this invention is capable of suppressing the leakage magnetic field generated from both crossing wire portions of the horizontal deflection coil by using a canceling coil having a coil side along the crossing wire portion of the horizontal deflection coil. Since it is composed of a reversely wound coil portion connected to the end of the winding of the deflection coil, it is possible to provide a deflection yoke that can improve the ease of mounting the canceling coil and improve productivity.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the main parts of an example of the deflection yoke according to this invention, Fig. 2 is a circuit diagram showing an example of the connection between the horizontal deflection coil and the cancellation coil, and Fig. 3 is a diagram showing the manufacturing process of the cancellation coil. Explanatory drawings, FIGS. 4A and 4B are a front view and a half-cut side sectional view of the deflection yoke showing an example of the mounting state of the cancellation coil, respectively, FIG. 5A is a side view showing only the core of the deflection yoke and the horizontal deflection coil, FIG. 6B is a front view of a horizontal deflection coil for explaining leakage magnetic fields, and FIG. 6 is a partially exploded perspective view of a conventional cathode ray tube display device equipped with an unnecessary radiation prevention device. 1b...Horizontal deflection coil, 1c, 1d...Covering wire portion, 6a, 6b...Leakage magnetic field, 7...Cancellation coil, 7a, 7b...Coil side, 9a, 9b...
Magnetic field for canceling leakage magnetic field. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The horizontal deflection coil has a coil side formed along the crossover wire portion of the horizontal deflection coil, and is provided with a canceling coil that generates a magnetic field for canceling a leakage magnetic field generated from the crossover wire portion when the horizontal deflection current is applied. A deflection yoke characterized in that the above-mentioned canceling coil is constituted by a reverse-wound coil part connected to a winding end of a coil and wound in a direction opposite to the horizontal deflection coil.