KR200152425Y1 - Structure for shielding flux of deflection yoke - Google Patents

Abstract

The present invention relates to a structure for preventing the leakage magnetic field of the deflection yoke, which can effectively cancel the leakage magnetic field of the horizontal coil radiated to the outside of the deflection yoke, even in the high frequency band. Had difficulty maintaining the shape.

Thus, the present invention provides a support guide portion for winding the wire directly to the bobbin and to maintain the shape of the wound wire to solve the above problems, and formed an assembly jig insertion hole that can be wound by combining the bobbin.

Thus, by improving the shape of the leakage preventing structure, the leakage magnetic field can be effectively canceled even in the structural wave band.

Description

Structure for preventing leakage magnetic field of deflection yoke

1 is a front view showing a deflection yoke equipped with a structure for preventing leakage magnetic field of a deflection yoke according to the present invention.

Figure 2 is a perspective view showing a structure for preventing the leakage magnetic field of the deflection yoke according to the present invention.

3 is a view for explaining a method of winding a coil to the bobbin according to the present invention.

FIG. 4 is a half sectional view showing a structure for preventing leakage magnetic fields of a conventional deflection yoke.

5 is a plan view showing a structure for preventing leakage magnetic fields of a conventional deflection yoke.

* Explanation of symbols for main parts of the drawings

7 bobbin 9 winding part

11: coil support guide portion 13: fastening coupling portion

15: lead out 17: hole

19: iron piece G: jig

C: coil

[Industrial use]

The present invention relates to a structure for preventing the leakage magnetic field of the deflection yoke, and more specifically, the leakage magnetic field of the deflection yoke, which can effectively cancel the leakage magnetic field of the horizontal coil radiated outside the deflection yoke even in the high frequency band by improving the shape of the structure. It relates to a structure for prevention.

[Prior art]

In general, the cathode ray tube is composed of a phosphor coated inside the panel and a shadow mask attached thereto, and a panel connected to the inner and outer graphite coated therein, and a neck portion having an electron gun embedded therein and a deflection yoke attached to the outer periphery. have.

Here, in the deflection yoke, a horizontal deflection coil is formed inside the separator formed by combining a pair of resins formed in a half-trumpet body to form a deflection magnetic field in a horizontal direction on the electron beam scanned from the electron gun, and outside the deflection yoke. A ferrite core of a vertical deflection coil is formed to form a deflection magnetic field in a direction perpendicular to the electron beam.

The deflection yoke generates a deflection magnetic field by applying horizontal and vertical sawtooth wave currents, thereby moving the electron beam scanned by the electron gun up and down and left and right to draw a raster on the screen.

On the other hand, the deflection magnetic field distributes the leakage magnetic field to the inside and the outside of the deflection yoke, of which only the magnetic field generated inside the inner contributes to the deflection of the electron beam, the leakage magnetic field generated to the outside is generated in each coil The magnetic field does not remain in the coil and flows to the outside, which only has a harmful effect on the human body, but does not significantly affect the characteristics of the deflection yoke.

In the external leakage magnetic field of the deflection yoke, the leakage magnetic field generated by the vertical deflection coil is minimal and there is no problem, while the leakage magnetic field generated by the horizontal deflection coil is harmful to the human body in front of the screen and other electronic devices. This will cause electronic interference, which will interfere with the operation of these electronic devices.

In the conventional ST (Saddle Troidal) type deflection yoke for offsetting the leakage magnetic field of the horizontal coil, a double coil is wound on the outer circumferential surface of the CRT, and then connected to the horizontal terminal of the coil deflection yoke, using the reverse magnetic field generated therein. The method of reducing the leakage magnetic field was used.

On the other hand, in the saddle yoke of SS type, the coil is wound around the core attached to the deflection yoke itself, thereby reducing the leakage magnetic field of the horizontal deflection coil.

The structure for preventing leakage magnetic field in the SS type deflection yoke as described above has been filed in Korean Utility Model Registration Application No. 92-10659 (June 15, 1992) proposed by the present applicant.

FIG. 4 is a half sectional view showing a conventional structure for preventing leakage magnetic field of a deflection yoke, and FIG. 5 is a plan view thereof.

As shown in the figure, a semicircular coil winding part 32 is provided inside the case 30 having the same curvature as the separator, and the case 30 is in close contact with the separator on the bottom of the case 30. A binding portion 34 for fixing is formed, and a plurality of heat dissipation openings 38 for dissipating heat generated by the coil 34 wound around the coil winding portion 32 on both sides of the end portion of the case 30. A cover 42 having a cover hook hole 40 formed therein is connected, and a cover hook 44 for fixing the cover 42 is formed inside the case 30.

When the coil is wound around the coil winding part 32 and the cover 42 is tightly fixed to the case 30, the cover hook hole 40 is attached to the cover hanger 44 to fix the cover 42 and the cover. The cover 42 is supported by the lower surface by the support part 46 extended in the hanger 44.

In addition, a lower portion of the central portion of the cover 42 is supported by the support member 48 extending from the case 30, and the wedges of the cover 42 are connected to the case 30 of the cover 42. 50 is formed, and the binding hole 52 to which the above-described wedge 50 can be bound is provided inside the coil winding 42 corresponding thereto.

The wedge 50 is inserted into the binding hole 52 to compress the binding hole 52, the support member 48 and the support portion 46 of the cover hook 44 is in close contact with the cover The portion is formed to be equal to the curvature of the cover 42 and firmly adheres to it.

As described above, in the conventional deflection yoke leakage magnetic field preventing structure, the cover covering the upper surface of the case is lowered to compress the coil, thereby preventing the change of the magnetic field generated in the coil, thereby preventing the deterioration effect of the leakage magnetic field.

[Problem trying to solve the invention]

However, the deflection yoke is continuously developed to various sizes of SS shape, and accordingly, the size and shape of the leakage magnetic field preventing structure also change.

In addition, in order to completely cancel the leakage magnetic field generated in the deflection yoke, the strong clamping force of the structure and the separator should not change the magnetic field according to the flow during assembly, and the shape of the structure was required as an important point.

The conventional deflection yoke leakage magnetic field preventing structure satisfies these requirements, but when used in the high frequency band with the trend of the enlargement of the CRT, the high frequency electric wire uses a Litz wire. There is a structural problem that is difficult to maintain the shape.

As a result, the dispersion of the leakage magnetic field is severe and it is difficult to satisfy the value of the very low frequency (VLF) or the extremely low frequency (ELF).

Therefore, the present invention was devised to solve the problems caused by such structural problems, and it is possible to effectively reduce the external leakage magnetic field caused by the horizontal deflection coil even in the high frequency band by improving the shape of the structure, and to obtain stable quality. It is an object of the present invention to provide a structure for preventing leakage magnetic fields of deflected yokes.

[Means to solve the problem]

In order to realize the above object, the present invention provides a structure for preventing the leakage magnetic field of the deflection yoke, which is installed in the deflection yoke to attenuate the leakage magnetic field of the horizontal deflection coil generated in the deflection yoke that deflects the electron beam. An additional bobbin is formed of two surfaces having a wide side and a narrow side, a winding portion in which a coil is wound along the circumference of the bobbin between both sides of the bobbin, and a coupling coupling portion for binding the bobbin to the separator on one side of the bobbin. Provided is a structure for preventing a leakage magnetic field of a deflection yoke.

[Action]

In the deflection yoke of the present invention, a high frequency electric wire is directly wound on the winding portion of the bobbin, and a coil support guide part is formed on the bobbin to maintain a constant shape of the wound wire, and the electric wire moves to offset the leakage magnetic field. Prevents deterioration.

In addition, the bobbin is provided with a fastening coupling portion prevents flow when the present invention is fastened to the separator and can maintain a strong fastening force can effectively cancel the leakage magnetic field of the horizontal coil even in the high frequency band.

EXAMPLE

Hereinafter, preferred embodiments of the structure for preventing leakage magnetic field of the deflection yoke according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows a deflection yoke 1 mounted with a structure for preventing leakage magnetic field according to the present invention, in which a horizontal coil (not shown) is wound inside the separator S, and a ferrite outside the separator S. The core 3 is mounted and a vertical deflection coil (not shown) is wound therein.

In addition, the structure 5 of the present invention is provided on both sides of the protrusion of the flange of the deflection yoke 1 to offset the leakage magnetic field generated in the deflection yoke 1.

As shown in FIG. 2 is a perspective view of the structure for preventing leakage of the present invention, the bobbin 7 is formed between the both sides of the bobbin 7 in the shape of a bobbin 7 formed on both sides of a wide middle portion and a narrow shape on both sides thereof. A coil winding portion 9 is provided around which a coil is wound.

At this time, the coil support guide portion 11 is formed on the slope of the bobbin so as to maintain the volume of the coil wound around the coil winding 9.

In addition, one side of the bobbin (7) is provided with a fastening coupling portion (13) facing the center so that the present invention can be combined with the separator, the lower end of both sides and the line of sight of the coil wound on the coil winding (9) The coil lead-out unit 15 is installed to draw the vertical line conveniently.

On the other hand, the hole 17 is formed around both sides of the fastening coupling portion 13, which is a combination of the bobbin (7) as shown in Figure 3 to the assembly jig (G) during winding the amount This is for convenient insertion into the hole 17.

In addition, the back of the support guide 11 is provided with a groove (not shown) that can be inserted into the iron piece 19 to enable electrical connection when measuring VLF, ELF.

As shown in FIG. 3, the bobbin 7 is inserted into the jig G, and the jig G is appropriately fitted in a state in which one end of the coil C is fixed to the winding part 9 side. Rotation by the rotating means can facilitate the winding of the coil (C).

Therefore, when power is applied to the structure for preventing leakage magnetic field of the present invention, a reverse magnetic field may be generated for the leakage magnetic field generated by the deflection yoke in the coil wound around the winding part 9 to offset the leakage magnetic field. The bobbin 7 improves the leakage magnetic field canceling effect by improving the shape of the bobbin 7 to have a wide middle portion and a narrow side surface.

In addition, in order to prevent flow when the present invention is coupled to the separator, the fastening coupling part 13 may be fastened perpendicularly to the protrusion 21 of the separator flange to maintain a strong fastening force, and to the back of the fastening coupling part 17. By attaching the iron pieces 19, such as an incline plate, favorable effect can be brought about in the measurement of VLF and ELF.

[Effect of design]

The effect of the leakage magnetic field canceling may depend on the structure, shape, size of the bobbin and the position point where the separator is fastened. The leakage magnetic field preventing structure of the present invention as described above has a shape and a separator for improving the canceling effect even at a high frequency band. It is provided in the part that can cancel the leakage magnetic field most by strong clamping force with.

In addition, although the shape of the wire wound on the bobbin has a lot of difficulties in maintaining the shape of the conventional Litz wire, by improving the shape of the bobbin of the present invention, it can be effectively used in high-resolution display.

Claims (4)

In the structure for preventing leakage magnetic field, which is installed in the cathode ray tube and attenuates the leakage magnetic field generated by the deflection yoke to deflect the electron beam, the pair of support guides 11 having a wide middle portion and two sides having narrow sides. )Wow; A winding part 9 formed so that a coil can be wound between the guide parts 11; A fastening coupling part 13 for fastening to the separator S of the deflection yoke; Structure for preventing the leakage magnetic field of the deflection yoke, including the iron piece (19) attached to the back of the fastening coupling portion 13 as the electrical connection means when measuring VLF, ELF. The structure for preventing magnetic field leakage of a deflection yoke according to claim 1, wherein the coil support guide portion (11) is provided with a lead portion (15) of the coil. 2. The structure of claim 1, wherein the coil support guide portion (11) and the winding portion (9) are provided with a jig insertion hole (17) for winding the coil (C). 2. The structure of claim 1, wherein the coil support guide portion (11) protrudes from the winding portion (9) to maintain the winding shape of the wound coil.