JPH04233139A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To provide a deflecting yoke which has been designed to reduce the undesired radiation level of a low-frequency wave given from a horizontal deflecting magnetic-field at a lower cost by constructing a bucking coil installed outside the deflecting yoke so as to negate the leakage magnetic field of the horizontal deflecting magnetic-field with the aid of a simpler coil forming means. CONSTITUTION:A deflecting yoke 1 provided with a core 2 formed out of a ferromagnetic body, a horizontal deflecting coil wound round the core 2 in the shape of a saddle and a bucking coil which negates a leakage magnetic field generated from this horizontal deflecting coil is manufactured through the process of forming a coppered portion 8 functioning as the aforementioned negator coil out of a printed wiring pattern on a printed circuit board 6 by a printing technique.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke designed to reduce the level of unnecessary radiation, and more particularly to a deflection yoke characterized by the configuration of a canceling coil for canceling leakage magnetic fields.

0002

[Background Art] Recently, in the cathode ray tube manufacturing industry, there is a strict requirement to reduce the level of unnecessary low-frequency radiation from display monitors. As shown in
For example, there is a deflection yoke disclosed in Japanese Utility Model Application No. 63-191554, which has already been put into practical use.

FIG. 10 shows a perspective view of the external appearance of the deflection yoke. In the figure, 1 is a deflection yoke, 2 is a core, 4 is a cancellation coil, and 5 is a support for fixing the main body of the deflection yoke 1. This is a separator.

FIG. 11 is an explanatory diagram schematically showing the state of the magnetic lines of force of the horizontal deflection magnetic field in the deflection yoke together with the leakage magnetic field. As shown in FIG. By adopting a structure in which the canceling coil 4 is provided, the magnetic field leaked to the outside of the horizontal deflection magnetic field from the deflection yoke 1 can be significantly reduced.

The circuit configuration of the cancellation coil 4 shown in FIG. 10 is as shown in FIGS. 12 and 13. That is, FIGS. 12 and 13 show a pair of canceling coils 4 connected in series to a pair of horizontal deflection coils 3. In particular, FIG. 12 shows a case where the pair of canceling coils 4 are connected in parallel. FIG. 13 shows a case where a pair of cancellation coils 4 are connected in series.

[0006] By the way, the following two methods are adopted for manufacturing the above-mentioned cancellation coil. That is, as shown in FIG. 14, a coil of several turns to more than ten turns is formed using a self-fusing wire 12 using a special winding mold (not shown).
Alternatively, as shown in FIG. 15, a method is adopted in which the wire is directly wound around a shaped bobbin 13 that matches the shape of the canceling coil.

[0007]

[Problems to be Solved by the Invention] However, the above-described method for manufacturing a cancellation coil has the following disadvantages. In other words, ■ a special winding mold and a special forming bobbin are required for countervailing coil forming; ■ no matter which method is adopted, winding must be performed;
■The wiring between the cancellation coil and the horizontal deflection coil system of the deflection yoke is complicated, making it extremely difficult to manufacture.

The present invention has been made to solve the above-mentioned disadvantages, and is a deflection method in which a canceling coil is formed by a simple coil forming method to reduce the level of unnecessary low-frequency radiation from a horizontal deflection magnetic field. The purpose is to provide a yoke.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a core made of a ferromagnetic material, a horizontal deflection coil wound in a saddle shape, and leakage generated from the horizontal deflection coil. In the deflection yoke equipped with a cancellation coil for canceling a magnetic field, the cancellation coil is constructed from a printed circuit board.

0010

[Operation] According to the present invention, since the canceling coil is constructed from a printed circuit board, the canceling coil can be easily manufactured by printing the circuit board, and moreover, it can be used in combination with the wiring board conventionally used as the terminal plate of the deflection yoke. It is also possible to do so, and it can be made structurally simple.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view of a deflection yoke according to an embodiment of the present invention, in which 1 is a deflection yoke;
2 is a core, 5 is a molded product called a separator that supports and fixes the main body of the deflection yoke 1, and 6 is a printed circuit board on which a copper-clad portion 8, which becomes a cancellation coil, is printed in a track shape using printing technology. The printed board 6 also serves as a terminal plate for the deflection yoke, and conventional horizontal deflection coil terminals and vertical deflection coil terminals are also arranged on this board. 14 indicates a terminal caulked to the printed circuit board.

The coil portions wired on the printed circuit board constituting the horizontal deflection coil and the cancellation coil are shown in FIGS. 12 and 13.
The wires are connected as shown in , and a canceling magnetic field is generated to cancel the leakage magnetic field from the horizontal deflection coil to the outside of the deflection yoke.

2 and 3 are diagrams showing how printed wiring for a cancellation coil is provided on a double-sided board, and FIG. 2 is a perspective view thereof, and FIG. 3 is a cross-sectional view taken along the line A--A in FIG. It is a diagram. As shown in these drawings, by using the double-sided board 7, it is possible to increase the number of turns of the cancellation coil formed by the copper-clad portion 8 printed in a track shape using the same board. Become. The printed wiring portions on the front and back sides can be easily connected by providing through holes, penetrating pins, or terminals on each surface and connecting the terminals with lead wires or the like.

FIGS. 4 and 5 are views showing solder plating applied to the surface of a copper-plated portion on which printed wiring for a cancellation coil is formed on one side of a single-sided board, and FIG. 4 is a perspective view thereof; FIG. 5 is a sectional view taken along the line A--A in FIG. 4. In these drawings, reference numeral 10 denotes a single-sided board, and solder plating 9 is applied on a copper-clad portion 8 printed on one side of the board. The above configuration is useful for keeping the resistance value of the printed wiring part that forms the cancellation coil low, and it is possible to configure the line width of the wiring part to be narrow, and the cancellation coil can be formed in a relatively small area. It also has the advantage of allowing a large number of coil turns for the same board area.

FIGS. 6 and 7 show a single-sided board in which a copper-clad part as a cancellation coil is formed by printed wiring, and a magnetic core is arranged approximately at the center of the track-shaped copper-clad part. 6 is a perspective view thereof, and FIG. 7 is a sectional view taken along the line AA in FIG. 6. In these drawings, 10 is a single-sided substrate, and 8 is the single-sided substrate 1.
This is a copper-clad part that serves as a cancellation coil printed on one side of the wire, and a magnetic core is disposed in the center of this copper-clad part. By changing the size of the magnetic core 11, its mounting angle, and the inclination of its end face, the direction of the magnetic field generated from the canceling coil can be controlled to some extent. Therefore, the installation of the board itself that forms the cancellation coil,
Alternatively, a degree of freedom is created in the arrangement structure, making it easier to attach the board to the main body of the deflection yoke 1, and a more stable mounting structure can be realized.

[0016] In the above, as the constituent material of the magnetic core 11, ferrite, which is the same as the core 2 used in the main body of the deflection yoke 1, is generally used because of the frequency used.

Furthermore, FIGS. 8 and 9 are diagrams showing how the central part of the track-shaped printed wiring part is hollowed out and the magnetic core 11 is disposed in that part, and FIG. 8 is a perspective view thereof. 9 is a sectional view taken along line A-A in FIG. 8. In these drawings, 7 is a double-sided board, 8 is a copper-clad part that serves as a cancellation coil printed on both sides of this double-sided board 7, and a magnetic core 11 is arranged in the hollowed out part of this central part. . By arranging the magnetic core 11 in the center in this way, compared to the embodiment shown in FIG. 6, the protrusion of the magnetic core 11 can be reduced structurally, and a more compact canceling coil can be realized. The number of turns of the coil provided on the substrate itself can be reduced.

In the above description, the substrate is assumed to be a copper-clad laminate made of paper phenol, paper polyester, or glass epoxy and has a thickness of about 1.6 mm. It goes without saying that the canceling coil portion is not limited to those exemplified above, and may be formed of a flexible substrate having elasticity.

In addition, if the printed wiring part exposed on the board is a problem when handling the deflection yoke, and it is necessary to perform some kind of insulation treatment to prevent electric shock, it is necessary to insulate it before attaching the board to the deflection yoke. Needless to say, this problem can be solved by applying an insulating varnish or an insulating resin to the surface of the substrate.

[0020]

As explained above, according to the present invention, since the cancellation coil portion is constructed from a printed circuit board, there is no need to separately wind the cancellation coil as in the conventional case.
Since a dedicated forming bobbin is not required, there is an advantage that the process for manufacturing the canceling coil can be greatly simplified. Furthermore, since the substrate portion constituting the cancellation coil can also be used as the portion conventionally used as the terminal plate of the deflection yoke, a reduction in the number of parts can be expected. Therefore, it is possible to provide a deflection yoke that reduces the level of unnecessary low-frequency radiation at a lower cost.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a double-sided substrate used in a deflection yoke according to an embodiment of the present invention, with printed wiring for a cancellation coil provided on the substrate.

FIG. 3 is a sectional view taken along line AA in FIG. 3;

FIG. 4 is a perspective view showing a board used in a deflection yoke according to an embodiment of the present invention, in which solder plating is applied to the surface of a copper-clad part on which printed wiring for a cancellation coil is formed on one side of a single-sided board; It is a diagram.

FIG. 5 is a sectional view taken along line AA in FIG. 4;

FIG. 6 is a substrate used in a deflection yoke according to an embodiment of the present invention, in which printed wiring of a canceling coil is formed on one side of a single-sided substrate, and approximately at the center of the printed wiring of a canceling coil configured in a track shape. FIG.

7 is a cross-sectional view taken along the line AA in FIG. 6. FIG.

FIG. 8 is a substrate used in a deflection yoke according to an embodiment of the present invention, in which a printed wiring portion of a track-shaped canceling coil is hollowed out approximately in the center, and a magnetic core is arranged in the hollowed out portion. FIG.

9 is a cross-sectional view taken along line AA in FIG. 8. FIG.

FIG. 10 is an external perspective view of a conventional deflection yoke.

FIG. 11 is an explanatory diagram schematically showing the magnetic lines of force of the horizontal deflection magnetic field in the deflection yoke together with the leakage magnetic field.

FIG. 12 is a diagram showing the connection relationship between a horizontal deflection coil and a cancellation coil, and shows a case where a pair of cancellation coils are arranged in parallel.

FIG. 13 is a diagram showing the connection relationship between a horizontal deflection coil and a cancellation coil, and shows a case where a pair of cancellation coils are connected in series.

FIG. 14 is a perspective view showing a case where a canceling coil is manufactured using self-fused wire.

FIG. 15 is a perspective view showing a case where a canceling coil is manufactured by winding the canceling coil directly on a molded bobbin.

[Explanation of symbols] 1 Deflection yoke 2 Core 3 Horizontal deflection coil 4 Cancellation coil 5 Separator 6 Board 7 Double-sided board 8 Copper clad part 9 Solder plating 10 Single-sided board 11 Magnetic core 14 Terminal

Claims (1)

[Claims] Claim 1: A deflection yoke comprising a core made of a ferromagnetic material, a horizontal deflection coil wound in a saddle shape, and a cancellation coil for canceling a leakage magnetic field generated from the horizontal deflection coil, wherein the cancellation coil is A deflection yoke characterized by being constructed from a printed circuit board.