JPS6319740A - Deflecting yoke device - Google Patents

Abstract

PURPOSE:To reduce unwanted radiation coming from a deflacting yoke device, by furthermore mounting canceling coils which qenerates a magnetic field opposite to the magnetic field passing through the inside of the core inside as one part of the horizontal deflecting magnetic field generated by horizontal deflecting coils. CONSTITUTION:Saddle-shaped horizontal deflecting coils 2, 3 and toroidal vertical deflecting coils 4, 5 are wound/mounted on the inner plane and the periphery of a circular core 1, so as to compose a deflecting yoke 7 used in a television receiver or the like. Furthermore, cancel coils 8,9 are mounted so that they are positioned in loop shapes on the X axis of the deflecting yoke 7 and wound/ disposed apparently in toroidal shapes toward the core 1. And they are connected in series with the horizontal deflecting coils 2,3 in order to generate a magnetic field opposite to the magnetic field which passes through the inside of the core 1 as one part of the horizontal magnetic field. Therefore the main magnetic field inside the core 1 is attenuated, together with being capable of effectively reducing the needless radiation which leaks outside the core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in a deflection field device mounted on a cathode ray tube of, for example, a television receiver or a CRT display device.

<Prior Art> As is well known, in a deflection yoke mounted on a cathode ray tube of a television receiver, a CRT display device, etc., the horizontal deflection coil is normally 15.75 KHz or higher to about 120 KHz. A vertical deflection current of around 60 Hz is supplied to the vertical deflection coils, and the electron beam is deflected by a predetermined amount using the horizontal deflection magnetic field and vertical deflection magnetic field generated from each deflection coil, and the desired image is displayed on the screen. In this case, the horizontal deflection magnetic field,
Both the vertical deflection magnetic field produces a leakage magnetic field to the outside of the deflection yoke (core). The existence of this external leakage magnetic field does not have a large effect on the characteristics of the deflection yoke, and since the deflection yoke itself is a device (component) that utilizes the leakage magnetic field from the deflection coil, it has recently been Until now, no measures had been taken to reduce the external leakage magnetic field using the deflection yoke itself.

In recent years, however, video equipment has become more diverse, such as by placing terminal equipment that supports high frequencies, such as combinations and lights, in close proximity to cathode ray tubes equipped with deflection yokes. Among the external leakage magnetic fields of the yoke, there is a concern that the external leakage magnetic fields of the high-frequency horizontal deflection magnetic fields will become unnecessary radiation and have an adverse effect such as causing malfunctions in other devices such as terminal devices. It has become desirable to reduce unnecessary radiation using the yoke itself.

In conventional deflection yokes, the basic principles of deflection yokes,
In other words, from the viewpoint that the deflection yoke uses the leakage magnetic field from the deflection coil to deflect the electron beam by a predetermined amount, in a small number of deflection yokes, a magnetic shield plate is provided to surround the outer periphery of the deflection yoke. The deflection yoke itself was not provided with any means for reducing unnecessary radiation, except for one in which unnecessary radiation was reduced by a magnetic shield plate.

Problems to be solved by this invention> However, in the case of conventional devices in which a shield plate is provided to surround the outer periphery of the deflection yoke, there is a problem that the shield plate is large in size, and the shield plate is characteristically large. In response to unnecessary radiation (external leakage magnetic field), another deflection magnetic field is formed, which improves the screen characteristics (landing).

There was a problem in that it had an adverse effect on convergence and deflection distortion. On the other hand, a deflection yoke that does not have any means for reducing unnecessary radiation may cause malfunctions in other models that are close to the deflection yoke, especially those compatible with high frequencies, or may cause disturbances in the image signal. There is a problem that there are adverse effects such as not being able to obtain normal image characteristics.

Means for Solving the Problems> In order to solve the above problems, the deflection yoke device of the present invention has the following features:
A core, a pair of saddle-shaped horizontal deflection coils and a toroidal or saddle-shaped vertical deflection coil wound along the inner surface of the core, and a pair of cancellation coils connected in series to the horizontal deflection coil, A cancellation coil is formed in a loop outside the core on or near the X axis of the deflection yoke, and is wound around the core in an apparent upper toroidal shape. Among the deflection magnetic fields, a magnetic field opposite to the magnetic field passing through and passing through the inside of the core is generated using a canceling coil on the side of the canceling coil near the outer surface of the core.

Action> A pair of canceling coils are connected to the X of the deflection yoke outside the core.
It is located on the axis or near the X axis and is formed into a loop shape, and is apparently wound around the core in an upper toroidal shape, and the horizontal deflection magnetic field generated by the horizontal deflection coil is divided into the magnetic field passing through the inside of the core. A reverse magnetic field is generated near the outer surface of the core of the canceling coil, and this magnetic field attenuates the main magnetic field of the horizontal deflection magnetic field produced by the horizontal deflection coil inside the core, causing unnecessary radiation to leak to the outside of the core. The amount can be radically reduced.

<Embodiment> Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes an annular core formed by joining a pair of semi-annular cores, and a pair of saddle-shaped horizontal deflection coils 2 and 6 are wound around the inner surface of the core 1. , a pair of toroidal vertical deflection coils 4.5 are wound around the outer periphery. A coil bobbin 6 is arranged on the inner surface of the core 1 and maintains insulation between the horizontal deflection coil 2.6 and the vertical deflection coil 4.5. Horizontal deflection film 2
．． 3. The vertical deflection coil 4.5 and the coil bobbin 6 constitute the deflection yoke main body 7. As shown in FIG. 4, a pair of canceling coils 8.9 are connected in series to the horizontal deflection coil 2.3 forming a part of the deflection yoke body 7, as shown in FIG. Cancellation coil 8.9
are each made of a copper wire whose outer periphery is covered with an insulating material, such as a vinyl-coated lead wire, an enameled wire, or a printed wiring board, and a deflection yoke (
It is located on the X axis of the deflection yoke body 7) and is formed into a loop shape, and is wound around the core 1 in an apparent upper toroidal shape. The deflection yoke body 7 is fixedly attached to the deflection yoke main body 7 by a shape that fits into a locking portion 10 provided in the deflection yoke body 7 . The canceling coils 8.9 cancel a magnetic field opposite to the magnetic field passing through the core 1 forming a part of the deflection yoke body 7 out of the horizontal deflection magnetic field generated by the horizontal deflection coils 2.3. This occurs on the side near the outer surface of the core 1 (indicated by 8E and 9E in FIG. The number of turns of the canceling coil 8.9 can be increased or decreased as appropriate depending on the degree of unnecessary radiation or the relationship with the impedance of the horizontal deflection coil. In the device, the core 1 is formed into a loop shape located on the X axis of the deflection yoke outside the core 1.
On the other hand, predetermined wiring connections are made with the cancellation coils 8.9, which are apparently wound and arranged in an upper toroidal shape, attached and fixed to the deflection yoke main body 7. After that, horizontal deflection coil 2
, 3, vertical deflection coil 4.5, cancellation coil 8.9
A predetermined current is applied to each of them. With the application of current,
As shown in FIG. 5, among the horizontal deflection magnetic fields IB generated by the horizontal deflection coils 2 and 3, a magnetic field HI passing through the core 1 is located outside the core 1 and forms a loop. The canceling magnetic field Hc generated by the formed canceling coil 8.9 becomes a magnetic field in the opposite direction on the outer surface of the core 1 of the canceling coil 8.9 (8E, 9B) close to the person, and as a result, the inside of the core 1 The amount of magnetic field H passing through is canceled out and reduced, and as the magnetic field HI is reduced,
This is achieved by relatively reducing unnecessary radiation HR leaking to the outside of the fan 71. Here, even if the magnetic field (main magnetic field) HI passing through the inside of the core 1 is attenuated by the canceling magnetic field He, unnecessary radiation can be reduced without adversely affecting screen characteristics (landing, convergence, deflection distortion). has been experimentally confirmed by the applicant.

In one embodiment of the deflection yoke device of the present invention, the vertical deflection coil is wound around the core in a toroidal shape. It's a good thing. Further, as shown in FIG. 6, the canceling coil 8.9 may be attached and fixed along the outer peripheral surface of the core 1. In this case, the canceling magnetic field Hc passes through the inside of the core 1 more effectively. magnetic field H
It acts on I. Further, the shape of the canceling coil is not limited to the illustrated example, and can be changed as appropriate as long as it is located outside the core, has a loop shape, and is wound around the core in an apparent upper toroidal shape. It is. Furthermore, in one embodiment of the deflection yoke device of the present invention, the cancellation coil is disposed diagonally on the X-axis of the deflection yoke outside the core, and is composed of one winding portion each. However, the number of winding portions of the canceling coil is not limited to the example (one), and can be increased as appropriate depending on the situation of unnecessary radiation. For example, as shown in FIG.゜9 may be configured with two winding parts 8A, 8B, 9A, 9B, respectively. In this case, cancel coils 8 (8A, 8B), 9 (
9A and 9B) are arranged in a winding manner near the X-axis of the deflection yoke. In one embodiment of the present invention, the canceling coil is constructed using a vinyl-coated lead wire, but as already mentioned, an enameled wire or a printed wiring board may be used. As shown, a cancellation coil (not shown) wound in a loop using ordinary insulated copper wire is housed in a box BK made of insulating material, and the box BK containing the cancellation coil is placed inside the deflection yoke body. The deflection yoke device may be constructed by attaching and fixing the deflection yoke device to the deflection yoke device.

<Effects of the Invention> The deflection yoke device of the present invention is as described above in detail, and produces the following effects.

In other words, a magnetic field (cancelling magnetic field) is generated by a canceling coil that is located outside the core on or near the X-axis of the deflection yoke and is formed in a loop shape and is wound in an apparent toroidal shape above the core. ] is the horizontal deflection magnetic field that passes through the inside of the core and forms an opposite magnetic field on the side near the core outer surface of the canceling coil.As a result, the main magnetic field of the horizontal deflection coil inside the fa is attenuated. This makes it possible to fundamentally and reliably reduce unnecessary radiation leaking to the outside of the core. This eliminates concerns about malfunctions in terminal devices, etc.) or disturbances in video signals.Also, by positioning the canceling coil outside the core on or near the X-axis of the deflection yoke. The core is apparently wound in an upper toroidal shape, and the canceling coil can be formed separately and independently from the deflection yoke body, and can be fixed (attached) to the deflection yoke body. ) can also be formed into a loop directly or with an insulating board.

It is extremely easy to lock and fix the device through a box or the like, and the productivity and workability are significantly improved, making it suitable for mass production. Furthermore, there is no need to arrange a canceling coil inside the core, and there is no effect on the main deflection magnetic field. As described above, the deflection yoke device of the present invention has various effects, and will be particularly effective in the future for use in video equipment compatible with high frequencies.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the deflection yoke device of the present invention, FIG. 2 is a cross-sectional view taken along the line ll-1i in FIG. 1, and FIG. 6 is a schematic side view of essential parts of an embodiment of the deflection yoke device of the present invention Figure 4 is a circuit diagram showing the connection state between the horizontal deflection coil and canceling coil, and Figure 5 is a circuit diagram showing the state of the magnetic field generated by the horizontal deflection coil and canceling coil, viewed from the head side of the deflection yoke body. FIG. 6 is a schematic side view of the main part of another embodiment, FIG. 7 is a sectional view of the main part of another embodiment, and FIG. 8 shows the cancellation coil attached and fixed to the deflection yoke body. FIG. 2 is a perspective view of a box used when 1... Core, 1A... Core outer surface, 2.3 Horizontal deflection) (Le, 4.5... Vertical deflection coil, 8.9...
cancel coil,

Claims (1)

[Claims] A core, a pair of saddle-shaped horizontal deflection coils and a toroidal or saddle-shaped vertical deflection coil wound along the inner surface of the core, and a pair of cancellation coils connected in series to the horizontal deflection coils. The cancellation coil is placed outside the core on the X axis of the deflection yoke or
A magnetic field located near the axis and formed in a loop shape and wound around the core in an apparent toroidal shape, and a magnetic field opposite to the magnetic field passing through the inside of the core among the horizontal deflection magnetic fields generated by the horizontal deflection coil. A deflection yoke device characterized in that the canceling coil is used to generate the canceling coil on a side closer to the outer surface of the core of the canceling coil.