JPH0454675Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a deflection yoke device mounted on a cathode ray tube of a television receiver, a CRT display device, or the like.

<Prior art> As is well known, in the deflection yoke mounted on the cathode ray tube of television receivers, CRT display devices, etc., the horizontal deflection coil is
A horizontal deflection current of 15.75KHz is supplied, a vertical deflection current of 60Hz is supplied to the vertical deflection coil, 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. In this case, both the horizontal deflection magnetic field and the vertical deflection magnetic field produce leakage magnetic fields to the outside of the deflection yoke. 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, with computers and other high-frequency terminal equipment being placed close to cathode ray tubes equipped with deflection yokes. Among the leakage magnetic fields, there is a concern that the external leakage magnetic field of the high-frequency horizontal deflection magnetic field becomes unnecessary radiation and has an adverse effect such as causing malfunctions in other devices such as terminal devices. There has been a growing demand for reducing unnecessary radiation.

In conventional deflection yokes, from the viewpoint of the basic principle of the deflection yoke, that is, the deflection yoke uses the leakage magnetic field from the deflection coil to deflect the electron beam by a predetermined amount. The deflection yoke itself was not provided with any means for reducing unnecessary radiation, except that a magnetic shielding plate was provided to surround the outer periphery of the yoke, and unnecessary radiation was reduced by the magnetic shielding plate.

<Problems to be solved by the invention> However, in the conventional deflection yoke in which a shield plate is provided to surround the outer periphery, there is a problem that the shield plate is large in size, and the shield plate is unnecessary due to its characteristics. (external leakage magnetic field) to form another deflection magnetic field, screen characteristics (landing,
There was a problem in that it had a negative effect on convergence and deflection distortion. On the other hand, with a deflection yoke that does not have any means for reducing unnecessary radiation, as mentioned above, other models that are close to the deflection yoke, especially those compatible with high frequencies, may malfunction or may cause disturbances in the video signal, causing normal operation. There was a problem that it had negative effects such as not being able to obtain good image characteristics.

<Means for Solving the Problems> In order to solve the above problems, the deflection yoke device of the present invention includes a core, a pair of saddle-shaped horizontal deflection coils wound along the core, and a pair of saddle-shaped horizontal deflection coils. The deflection yoke body consists of a toroidal vertical deflection coil and a coil bobbin that is placed on the inner surface of the core and maintains insulation between the horizontal deflection coil and the vertical deflection coil. A pair of cancel coils that generate a magnetic field opposite to the horizontal deflection magnetic field that leaks to the outside from the deflection yoke body generated by the coils are connected in a substantially hollow shape, and the enlarged front end of the coil bobbin is connected to the coil bobbin. A front annular part along the outer surface, a rear annular part along the outer surface of the enlarged rear end of the coil bobbin, and a diagonal part located outside the deflection yoke body connecting the front annular part and the rear annular part. It consists of a pair of connecting parts, each of which is equipped with an auxiliary bobbin with a groove formed in it,
The grooves of the auxiliary bobbin are formed in the same direction in the entire area of the front annular part, the entire area or most of the rear annular part, and the entire area of the connecting part, and each of the cancel coils is fitted and mounted in the groove of the auxiliary bobbin. It is attached and fixed to the deflection yoke main body.

<Function> Using an auxiliary bobbin in which a pair of cancel coils pre-formed into a substantially hollow shape are attached to the coil bobbin, the entire area of the front annular part, the entire area or most of the rear annular part, and the entire area of the connecting part of the auxiliary bobbin is used. It is fitted and fixed to the deflection yoke body by fitting into a groove formed in the same direction, and prevents unnecessary radiation of the horizontal deflection magnetic field leaking to the outside from the deflection yoke body generated by the horizontal deflection coil. The unnecessary radiation generated by the cancel coil can be reduced by a predetermined amount using a cancel magnetic field opposite to the unnecessary radiation.

<Example> Hereinafter, an example of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes an annular core. A pair of saddle-shaped horizontal deflection coils 2 and 3 are wound around the inner surface of the core 1, and a pair of toroidal-shaped vertical deflection coils are wound around the outer periphery. Coils 4 and 5 are wound. 6 is arranged on the inner surface of the core 1, and horizontal deflection coils 2 and 3 and vertical deflection coils 4 and 5 are arranged on the inner surface of the core 1.
It is a coil bobbin that maintains insulation between core 1, horizontal deflection coils 2 and 3, vertical deflection coil 4,
5. The coil bobbin 6 constitutes a deflection yoke main body 7. As shown in FIG. 3, a pair of cancel coils 8 and 9 are connected in series to the horizontal deflection coils 2 and 3 forming part of the deflection yoke body 7, as shown in FIG. The cancel coils 8 and 9 generate a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke body 7 generated by the horizontal deflection coils 2 and 3, and as shown in FIG. It is fixedly attached to the deflection yoke main body 7 via the auxiliary bobbin 10 in a state in which it is previously formed into a substantially hollow shape using a wire. Auxiliary bobbin 1
0, a front annular portion 10a along the outer circumferential surface 6a1 of the enlarged front end portion 6a of the coil bobbin 6, which forms a part of the deflection yoke main body 7, and an outer periphery of the enlarged rear end portion 6b of the coil bobbin 6, as shown in FIG. A rear annular portion 10b along the surface 6b1 and a rear surface 6b2, and a pair of diagonally located portions located outside the deflection yoke body 7, that is, outside the core 1, and connecting the front annular portion 10a and the rear annular portion 10b. It consists of connecting parts 10c and 10d, and is attached and fixed to the coil bobbin 6 by appropriate means such as engagement or adhesion.The front annular part 10a and the rear annular part 10b each have a substantially U-shaped cross section. A groove portion 11 is formed toward the outer periphery in the front annular portion 10a, and a groove portion 11 is formed toward the outer periphery in the front annular portion 10b.
, the vertical portion 10b1 along the outer circumferential surface 6b1 of the enlarged rear end portion 6b of the coil bobbin 6 is directed laterally,
The other horizontal portions 10b2 mainly along the back surface 6b2 are formed continuously toward the outer periphery, and connecting portions 10c, 10d
There are grooves 1 that are located above and below and also have a substantially U-shaped cross section.
2 is formed toward the outer periphery. In other words, the grooves 11 and 12 are formed in the same direction over the entire area of the front annular part 10a, most of the rear annular part 10b except for the vertical part 10b1, and the entire area of the connecting parts 10c and 10d. The cancel coils 8 and 9, which have been formed into a substantially hollow shape in advance, are each attached to the auxiliary bobbin 1.
The front ends of the horizontal deflection coils 2 and 3 are fitted into the grooves 11 and 12 of the coil bobbin 6 and are housed in the enlarged front end portion 6a of the coil bobbin 6, approximately corresponding to the winding positions of the horizontal deflection coils 2 and 3. In the wires 2a, 3a portion, the front end connecting wire 2a, using the front annular portion 10a,
The horizontal deflection coil 2 is located on the outer periphery of the portion 3a.
3 (not shown), the connecting portion 10
Core 1 (deflection yoke body 7) using c and 10d
In the rear end connecting wires 2b and 3b of the horizontal deflection coils 2 and 3 located outside the rear end enlarged portion 6b of the coil bobbin 6, the rear annular portion 10
b is located on the outer periphery and back surface of the rear end connecting wires 2b and 3b, and is attached and fixed to the deflection yoke main body 7. Here, in this embodiment, the cancel coils 8 and 9 are 0.4φ
It is constructed by using five turns of five copper wires twisted together or bundled without twisting and wound by bifilar winding. In addition, a notch s is provided in a part of the front annular part 10a and the rear annular part 10b (part of the flange forming the groove part 11) of the auxiliary bobbin 10, and in this case, the groove part of the cancel coils 8, 9 11, 12 can be fitted smoothly.

In the deflection yoke device having such a configuration, a predetermined current is applied to the horizontal deflection coils 2 and 3, the vertical deflection coils 4 and 5, and the cancel coils 8 and 9, respectively. At this time, as shown in FIG. 6, out of the horizontal deflection magnetic field H _B generated by the horizontal deflection coils 2 and 3, unnecessary radiation leaks from the deflection yoke body 7 to the outside.
A cancel magnetic field H is generated by cancel coils 8 and 9 which are formed in a substantially crutch shape and are fixedly attached to the horizontal deflection coils 2 and 3 through an auxiliary bobbin 10 to the H _{R. C} becomes a magnetic field in the opposite direction, and part of the unnecessary radiation H _R is canceled out and reduced by the cancel magnetic field H _C. That is, the seventh
As shown in the figure, the antenna is installed at a predetermined distance L (usually 3 m) from the center point of the horizontal deflection coils 2 and 3, that is, the center point 0 of the deflection yoke body 7.
The unnecessary radiation (H _R ) of the horizontal deflection magnetic field (H _B ) applied to the AT was 28 dB without the cancel coils 8 and 9, but when the cancel coils 8 and 9 were not installed, the unnecessary radiation (H R ) was
9 and applying a canceling magnetic field (H _C ) reduces the noise level by about 30% to 20 dB.

In one embodiment of the deflection yoke device of the present invention, an auxiliary bobbin for attaching and fixing the cancel coil to the deflection yoke body is integrally formed in an annular shape. It may also be constructed by dividing it into two parts corresponding to the cancel coil and forming a pair of semi-annular shapes, and then forming the pair of semi-annular parts into an annular shape by joining and attaching them to the coil bobbin. . Furthermore, the attachment position of the auxiliary bobbin to the coil bobbin is not limited to the embodiment, and the front annular portion may be placed along the back side of the enlarged front end portion of the coil bobbin, or the rear annular portion may be placed along the back side of the enlarged front end portion of the coil bobbin. The auxiliary bobbin may be arranged along the front surface of the enlarged rear end portion, and the attachment positions of the front annular portion and the rear annular portion of the auxiliary bobbin to the coil bobbin are appropriately combined based on the outer surfaces of the enlarged front end portion and the enlarged rear end portion. It is something that can be done. Further, 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, but the vertical deflection coil may be formed in a saddle shape and wound. It is something. Furthermore, regarding the timing of fitting the cancel coil into the groove of the auxiliary bobbin, it can be done before the auxiliary bobbin is attached to the coil bobbin, or after the auxiliary bobbin is attached to the coil bobbin. The formation direction of the groove provided on the rear annular portion of the auxiliary bobbin is also set in the same direction as the formation direction of the groove provided on the front annular portion and the connecting portion over the entire area. is also good. Furthermore, in this example, the cancel coil is 0.4φ.
Although we have described a configuration using five turns of copper wires twisted together or bundled in a bi-filer, the wire diameter, number, number of turns, etc. of the copper wires are not limited to the examples, and the horizontal deflection It can be changed or increased or decreased as appropriate depending on the impedance of the coil, and when using copper wire with a thick wire diameter of 0.5φ to 1.0φ, for example, it is constructed by simply using several turns instead of twisting or bundling multiple wires. It's a good thing.

<Effects of the Invention> The deflection yoke device of the invention has been described in detail above, and produces the following effects. In other words, the magnetic field generated by the cancel coil fixed to the deflection yoke body via the auxiliary bobbin forms a magnetic field opposite to the horizontal deflection magnetic field leaking outside from the deflection yoke body, resulting in screen characteristics. Unnecessary radiation of the horizontal deflection magnetic field is reliably reduced without adversely affecting (landing, convergence, deflection distortion), and does not cause malfunctions in other devices (computer terminals, etc.) near the deflection yoke. This eliminates concerns about signal disturbance. Also,
The cancel coil is formed into a substantially hollow shape and is fitted into the groove of the auxiliary bobbin.In this case, the groove is inserted into the entire area of the front annular part of the auxiliary bobbin, the entire area or most of the rear annular part, and the connecting part. Since the entire area of the cancel coil is formed in the same direction, fitting the cancel coil into the groove is extremely simple, just by pressing and inserting the coil into the groove from one direction (one-touch), which greatly improves work efficiency. It will improve. Furthermore, the cancel coil is fitted into a groove formed in the auxiliary bobbin and fixed to the deflection yoke body, so that the insulation between the cancel coil and the vertical deflection coil is maintained well, and at the same time, the cancel coil This also prevents accidents such as contact with other parts (tightening screws, etc.). Furthermore, the mounting position of the cancel coil to the deflection yoke body is reliably fixed at a constant location for a long time, so there is no variation in the rate of reduction of unnecessary radiation, and stable characteristics can be maintained. It is something. Furthermore, the deflection yoke itself is equipped with a cancel coil formed in a nearly hollow shape to reduce unnecessary radiation via an auxiliary bobbin, which has never been thought of before, increasing the range of application of the deflection yoke itself, and especially This is extremely promising for use in high-frequency video equipment.

[Brief explanation of the drawing]

Figure 1 is a side view of one embodiment of the deflection yoke device of the present invention, Figure 2 is a rear view, Figure 3 is a circuit diagram showing the connection between the horizontal deflection coil and cancel coil, and Figure 4 is the same. A schematic perspective view of the cancel coil, Fig. 5 is a perspective view of the auxiliary bobbin, Fig. 6 is an explanatory diagram showing the state of the magnetic field generated by the horizontal deflection coil and the cancel coil, and Fig. 7 is a measurement of unnecessary radiation. FIG. 1...Core, 2, 3...Horizontal deflection coil, 4,
5... Vertical deflection coil, 6... Coil bobbin, 6
a... Enlarged front end part, 6b... Enlarged rear end part, 7
. . . Deflection yoke main body, 8, 9 . . . Cancel coil, 10 . . . Auxiliary bobbin, 10a .

Claims (1)

[Scope of utility model registration request] a core; a pair of saddle-shaped horizontal deflection coils and a pair of saddle-shaped or toroidal-shaped vertical deflection coils wound along the core; A deflection yoke body is constructed from a coil bobbin that maintains insulation of the deflection yoke body, and a horizontal deflection magnetic field generated by the horizontal deflection coil and leaking to the outside from the deflection yoke body is opposite to the horizontal deflection magnetic field generated by the horizontal deflection coil in series with the horizontal deflection coil of the deflection yoke body. A pair of cancel coils that generate a magnetic field are connected in a substantially hollow-shaped state, and a front annular portion along the outer surface of the enlarged front end portion of the coil bobbin and a front annular portion along the outer surface of the enlarged rear end portion of the coil bobbin are attached to the coil bobbin. It consists of a rear annular part along the outer surface and a pair of diagonally located connecting parts located outside the deflection yoke body and connecting the front annular part and the rear annular part, each of which has a groove part formed therein. An auxiliary bobbin is installed, the grooves of the auxiliary bobbin are formed in the same direction in the entire area of the front annular part, the entire area or most of the rear annular part, and the entire area of the connecting part, and each of the cancel coils is attached to the auxiliary bobbin. A deflection yoke device, characterized in that the deflection yoke device is fixedly attached to the deflection yoke main body by being fitted into the groove of the deflection yoke.