JP2971487B2 - Deflection yoke - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke installed in a cathode ray tube of a television receiver or the like.

[Conventional technology]

In recent years, deflection yokes with reduced astigmatism and improved raster distortion have been developed. However, it is difficult to achieve both improvement of astigmatism and improvement of raster distortion, and it is said that if one of them is improved, the other becomes worse, and the compatibility has reached the limit.

For this reason, deflection yokes having a deflection coil divided into at least two windings have been developed. Specifically, for example, one of a pair of deflection coils for horizontal deflection and one of a pair of deflection coils for vertical deflection are respectively divided.

In this deflection yoke, one of the two windings is optimally designed to improve, for example, raster distortion, and the other is optimally designed to improve astigmatism. This is to obtain an improved raster distortion and astigmatism compatible point.

4 and 5 show a conventional example. That is,
This deflection yoke shows the external appearance of one of a pair of saddle-type deflection coils for horizontal deflection or one of a pair of deflection coils for vertical deflection.
These are combined to form a pair of deflection coils for horizontal deflection or a pair of deflection coils for vertical deflection. These figures show an example in which the divided winding of one of the deflection coils includes an inner coil 1 'and an outer coil 2'.
Therefore, in order to form a pair of deflection coils for horizontal deflection or a pair of deflection coils for vertical deflection, a total of four windings are required so that there are two inner coils 1 'and two outer coils 2'. Is required.

Although the inner coil 1 'and the outer coil 2' are originally formed without dividing one of the deflection coils for horizontal deflection as described above, the inner coil 1 'and the outer coil 2' are divided into two in order to obtain required deflection yoke characteristics. It was done. That is,
The number of wires forming the conventional inner coil 1 'and the number of wires forming the outer coil 2' are the same. For example, when the inner coil 1 'is wound with two wires, the outer coil 2' is also wound with two wires. Was.

As shown in FIGS. 10 and 11, such a winding is formed by using a winding die composed of an outer die 15 and an inner die 16, and forming a coil formed between the outer die 15 and the inner die 16. An electric wire 19 is inserted into the space through a frontage 17 serving as an electric wire insertion port via a flyer 18 and wound. The wound coil separates the outer die 15 and the inner die 16 as shown in FIG.

[Problems to be solved by the invention]

In order to completely achieve both the improvement of the raster distortion and the improvement of the astigmatism by this deflection yoke, for example, the case where the number of electric wires of one of the divided windings of a pair of horizontal deflection deflection coils is one is described. As shown in FIG. 6, the inner coil 1 ′ must have an inverse cos θ distribution, and the outer coil 2 ′ must have a higher-order (for example, sixth-order, eighth-order, etc.) cos θ distribution.

However, the inner coil 1 'and the outer coil 2'
Both have a distribution having an extreme cross-sectional shape, so the instability of the coil distribution increases during the manufacturing process of the deflection coil, which is a factor of variation.

Also, as is apparent from FIG. 6, the division into the inner coil 1 'and the outer coil 2' requires the winding to have a divided portion 3 'of the winding, and the portion where the electric wire of the winding becomes clogged is required. Since the cross-sectional area is reduced, that is, the cross-sectional area of the winding is reduced, the current flowing through the deflection coil and the active power generated by the resistance of the wound wire are increased, and the heat generated by the deflection yoke cannot be ignored. .

FIG. 7 is an external view of the inner coil 1 ', and FIG. 8 shows an outer shape of an enlarged cross section of FIG. 7 and a winding process of an electric wire. Five
a 'and 5b' are the end of winding of the inner coil 1 'itself.
This corresponds to the opening 17 of the winding form shown in FIG. Reference numerals 5c 'and 5d' are portions at which the inner coil 1 'itself starts to be wound, and correspond to the innermost portion farthest from the frontage of the winding form. That is, when winding the electric wire 6 ′ in the winding step, the part 5
The winding is started from a ', 5b' and the parts 5c ', 5d' are slid and packed as shown by arrows in FIG. In this case, since the distribution of the inner surface coil 1 'is an inverse cosθ distribution, the frontage 17 of the winding form is very narrow. It cannot be inserted, and the specified winding cannot be made.

Accordingly, an object of the present invention is to provide a deflection yoke that can increase the cross-sectional area of a winding, increase the width of the winding at the beginning of winding, and reduce variations due to instability of winding distribution. is there.

[Means for solving the problem]

A deflection yoke according to the present invention is a deflection yoke having a pair of deflection coils each including at least two windings, wherein the two windings are configured by an inner coil and an outer coil, The outer coil has a larger number of winding wires than the outer coil, the inner coil and the outer coil are connected in series, and the inner coil has an inverse cos θ distribution, and the outer coil has a cos θ distribution. It is assumed that.

[Action]

According to the present invention, the number of electric wires forming each divided winding is different from each other, but the amount of current flowing through one electric wire is correspondingly different, so that a required magnetic field can be generated. In this case, since the number of winding wires of the inner coil having the inverse cos θ distribution is larger than that of the outer coil, the cross-sectional area of the inner coil can be increased, the heat generation can be reduced, and the opening of the winding form can be increased. In addition, unlike the conventional case, the electric wire is hardly caught near the frontage, so that the specified coil can be easily wound, the variation due to the instability of the winding distribution can be reduced, and stable winding performance can be obtained.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. That is, FIG. 1 shows one of a pair of horizontal deflection coils or one of a pair of vertical deflection coils formed by winding an electric wire in a saddle type or a toroidal type. FIG. 2 shows the electric wires 4, 6, and 7 before forming each winding. Each of the divided windings includes an inner coil 1 and an outer coil 2 corresponding to FIG. As shown in FIG. 2, the number of electric wires of the inner coil 1 and that of the outer coil 2 are different, and the inner coil 1 is wound by two electric wires 4 and 6. The outer coil 2 is wound by one electric wire 7.

According to this embodiment, the number of electric wires forming the inner coil 1 is 4,6, and the conventional inner coil 1 'is 2
By doubling, the cross-sectional area of the inner coil 1 'is doubled. Therefore, since the amount of current flowing through one electric wire is different, a required extreme magnetic field can be created.

Also, the winding distribution is inverse cosθ like the conventional deflection yoke.
Even in the distribution, as is clear from the comparison with FIG. 6, the frontage of the winding form is sufficiently large, so that even if an electric wire is caught near the frontage, a stable winding can be obtained without blocking the frontage. In addition, the production stability of the manufacturing process of the deflection coil can be secured.

In addition, the area where the wound wire becomes clogged becomes large, and the coil cross-sectional area increases, so that the resistance of the wound wire decreases, and the heat generated by the deflection yoke caused by the current flowing through the deflection coil decreases. Will be done.

FIG. 3 shows a second embodiment of the present invention. That is,
This deflection yoke is configured using a winding frame P used for a recent high-resolution cathode ray tube. In order to obtain a more precise magnetic field distribution, the deflection coil of such a deflection yoke is generally divided into a plurality of windings of a plurality of subcoils 8 to 11 having different diameters and the number of windings. Be composed.

In the case of this embodiment, it is constituted by four subcoils 8 to 11. Of these four subcoils 8 to 11,
The number of wires of at least one subcoil is different from the number of windings of another coil.

According to this embodiment, when the number of wires forming one subcoil is extremely small, such as 1/2 or less, as compared with the other subcoils, by increasing the number of wires of this subcoil,
There is an effect that a stable winding characteristic can be obtained, the resistance of the deflection yoke can be reduced, and heat generation can be suppressed.

〔The invention's effect〕

According to the deflection yoke of the present invention, since the number of winding wires of the inner coil having the inverse cosθ distribution is larger than that of the outer coil, the cross-sectional area of the inner coil can be increased, the heat generation can be reduced, and the winding form can be reduced. The opening of the wire can be enlarged, so that the wire is hardly caught in the vicinity of the frontage as in the past, so that the specified coil can be easily wound, the variation due to the instability of the winding distribution can be reduced, and stable winding performance can be obtained. There is an effect that it can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of one side of a horizontal deflection coil according to a first embodiment of the present invention, FIG. 2 is a connection wiring diagram of the coil, and FIG. 3 is deflection using a winding frame of the second embodiment. Front view of the yoke,
FIG. 4 is an external view of a saddle type deflection coil divided into two parts, FIG. 5 is a side view thereof, FIG. 6 is a cross-sectional view thereof, FIG. 7 is an external view of an inner coil, and FIG. FIG. 9 is an explanatory view showing an outer shape and a winding process of an electric wire, FIG. 9 is a perspective view of a state in which a winding form is separated to take out a wound coil, and FIG. Partial perspective view of the
FIG. 11 is an explanatory diagram showing a state in which a coil is wound. 1 ... inner coil which is one of the windings 2 ... outer coil which is the other of the windings 4, 7, 8 ... ... electric wire

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-211838 (JP, A) JP-A-61-114444 (JP, A) JP-A-51-17623 (JP, A) 70825 (JP, U) Japanese Utility Model Showa 54-11702 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 29/76 H01F 5/00-5/06

Claims (1)

(57) [Claims] 1. A deflection yoke having a pair of deflection coils each having at least two windings.
The windings are composed of an inner coil and an outer coil, the inner coil has a larger number of winding wires than the outer coil, the inner coil and the outer coil are connected in series, and the inner coil A deflection yoke, wherein the coil has an inverse cos θ distribution, and the outer surface coil has a cos θ distribution.