JPH0542775B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a self-concentrating saddle-saddle type deflection yoke built into an in-line color cathode ray tube, and particularly to a self-concentrating saddle-saddle type deflection yoke for reducing temperature rise in each part of the deflection yoke. The present invention relates to a deflection yoke in which a high frequency deflection winding is provided outside a low frequency deflection winding.

[Conventional technology]

FIG. 2 is a side sectional view of a conventional saddle-saddle type deflection yoke. A saddle-type vertical deflection winding 3 is arranged on the outside of the saddle-type horizontal deflection winding 1 via a separator 2 of a molded part, and a high magnetic permeability core 4 surrounds the entire outside of the saddle-type vertical deflection winding 3. . Here, a general case in which the horizontal deflection current has a higher frequency than the vertical deflection current will be described as an example.

Considering the operating state of the deflection yoke, a sawtooth wave current for scanning flows through the horizontal and vertical deflection windings 1 and 3 (hereinafter simply referred to as windings 1 and 3).
At this time, alternating current losses (copper loss, eddy current loss, and skin loss) occur in these windings 1 and 3, while iron loss (hysteresis loss, eddy current loss) occurs in the core 4. These losses increase as the frequency of the sawtooth current flowing through the windings increases, and the temperature of each part of the deflection yoke increases due to these losses.

By the way, in recent years, in order to increase the resolution of images, means have been adopted to increase the frequency of the horizontal deflection current, and as mentioned above, when the frequency increases, the AC loss in the windings 1 and 3 and the core 4 The iron loss inside the deflection yoke becomes large, and the temperature rise in each part of the deflection yoke becomes large. As a result, the separator 2 of the molded part
This has caused problems such as deformation of the deflection yoke and convergence changes due to deformation of the entire deflection yoke, and a decrease in the durability of the deflection yoke due to thermal deterioration of the insulator.

Furthermore, as the frequency of the sawtooth current in the horizontal deflection winding 1 increases with the aim of increasing the resolution, considering the size of the heat source that causes the temperature rise, it is necessary to Therefore, the loss occurring within the horizontal deflection winding 1 has become large. In particular, it has been empirically found that this phenomenon becomes noticeable when the frequency of the horizontal deflection winding 1 becomes 35 KHz or higher.

[Problem that the invention seeks to solve]

In this way, horizontal deflection winding 1 aiming at high resolution
In response to higher frequencies, measures such as increasing the cross-sectional area of the winding or the volume of the core, or installing a new cooling fan or increasing the capacity are taken to suppress the temperature rise in each part of the deflection yoke. However, it has the disadvantage of increasing costs and increasing the size of the device.

Conventionally, in order to improve this high-frequency loss, high-frequency saddle-type windings were wound in parallel with many thin wires such as Ritsu wire. Sufficient effects have been obtained for high-frequency windings up to The purpose is to reduce the eddy current losses occurring in the windings by dividing the windings into thin wires.

However, for higher frequencies of 35KHz or higher,
Even if measures are taken to reduce eddy current loss by winding a large number of thin wires in parallel, the temperature increase in the deflection yoke remains a serious problem.

Further, it is not preferable to use a thin wire such as Ritsu wire as a material for the saddle-type deflection winding from the viewpoint of workability of the winding. In other words, compared to the conventional method of winding a single coil with a large cross-sectional area, winding multiple coils with a small cross-sectional area results in poor winding workability in terms of winding accuracy. That is clear. As the frequency becomes higher, the number of divisions increases more and more, and from the viewpoint of winding workability, it is inappropriate to have a saddle-type deflection winding made of many thin wires wound in parallel at the innermost side of the deflection yoke. I can say that.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by focusing on the fact that the amount of heat generated by the two windings is relatively different, it was developed to suppress the temperature rise of insulators. It is an object of the present invention to provide a deflection yoke that can reduce the temperature rise of each part by simple structural improvement without using any special members.

[Means for Solving the Problems] The deflection yoke according to the present invention has a saddle-type high-frequency deflection winding in which a large number of fine wires are wound in parallel inside the core and a high-frequency deflection current of 35 Hz or more is passed through the saddle-type high-frequency deflection winding. A feature is that a low frequency deflection winding is arranged inside this high frequency deflection winding with a separator interposed therebetween.

[Effect]

According to this invention, firstly, by configuring the high-frequency deflection winding from a large number of parallel windings of thin wire, the eddy current loss generated in the winding can be reduced, and the temperature corresponding to the reduced loss can be reduced. The high-frequency deflection winding, which has a relatively higher loss than the low-frequency deflection winding, is placed outside the low-frequency deflection winding while suppressing the increase in the
In other words, by placing it in a location with low thermal resistance,
The heat dissipation characteristics of the deflection yoke as a whole have been improved,
It is possible to suppress the temperature rise in each part of the deflection yoke as much as possible and improve performance and reliability.

[Embodiments of the invention]

Hereinafter, one embodiment of the deflection yoke according to the present invention will be described with reference to the drawings. In FIG. 1, 3 is a vertical deflection winding, which is made by winding a large number of fine wires in parallel on the outside through a separator 2, and is a saddle type horizontal deflection winding 1 to which a high frequency deflection current of 35 Hz or higher is passed. is arranged, and furthermore, a core 4 is arranged outside the horizontal deflection winding 1.

Consider the equivalent thermal circuit of the deflection yoke. Let the heat flows (losses) generated in the horizontal deflection winding 1, the vertical deflection winding 3, and the core 4 be Q _h , Q _v , and Q _c . The equivalent thermal circuit of a conventional saddle-saddle type deflection yoke is shown in FIG. The heat sources are Q _h generated in the horizontal deflection winding 1, Q _v generated in the vertical deflection winding 3, and Q _c generated in the core 4, and these are the thermal resistance R _h of the horizontal deflection winding 1, the separator 2 Connected in series with the thermal resistance R _s of the vertical deflection winding 3, the thermal resistance R _v of the vertical deflection winding 3, the thermal resistance R _c of the core 4 and the thermal resistance R _a due to heat transfer between the core 4 and the surrounding air, the heat flow is It is thought that it flows in the direction of the arrow.

Further, θ _h , θ _s , θ _v , θ _c , and θ _a represent the temperatures of the horizontal deflection winding 1, the separator 2, the vertical deflection winding 3, the core 4, and the surrounding air, respectively.

FIG. 4 is an equivalent thermal circuit of this embodiment. heat source
Q _h , Q _v , Q _c and thermal resistance R _h , R _s , R _v , R _c , R _a are respectively the same as those explained in FIG. 3, but
Since the temperatures of each part θ _h , θ _s , θ _v , θ _c are different between the two,
Figure 4, which is the equivalent thermal circuit of the above example, has a subscript 1.
is attached. However, the ambient air temperature θ _a is the same in both cases. Regarding the relationship between heat flow, thermal resistance, and temperature, the following equation holds true with respect to FIG. 3 from thermal circuit theory.

θ _c = θ _a + (R _c + R _a ) (Q _h + Q _v + Q _c ) θ _v = θ _c + R _v (Q _h + Q _v ) θ _s = θ _v + R _s Q _h θ _h = θ _s + R _h Q _h (1) Similarly, the following equation holds true for the thermal equivalent circuit of the deflection yoke of this embodiment in FIG.

θ _c1 = θ _a + (R _c + R _a ) (Q _v + Q _h + Q _c ) θ _h1 = θ _c1 + R _h (Q _v + Q _h ) θ _s1 = θ _h1 + R _s Q _v θ _v1 = θ _s1 + R _v Q _v (2) Here, for simplicity, if Q _h is very large compared to Q _v and Q _c , equations (1) and (2) will be replaced by (3), respectively.
It becomes as shown in equation (4).

θ _c = θ _a + (R _c + R _a ) Q _h θ _v = θ _c + R _v Q _h θ _s = θ _v + R _s Q _h θ _h = θ _s + R _h Q _h (3) θ _c1 = θ _a + (R _c +R _a ) Q _h θ _h1 = θ _c1 +R _h Q _h θ _s1 = θ _h1 θ _v1 = θ _s1 (4) When these are expressed in figures, they are shown in Figs. 5 and 6. FIG. 5 shows the temperature distribution of each part of the conventional deflection yoke, and FIG. 6 shows the temperature distribution of each part of the deflection yoke of this embodiment. In addition, in these figures,
For convenience, it is assumed that R _v and R _h are the same value.

From these figures, it is clearly seen that the deflection yoke of this embodiment has an improved overall temperature lower than that of the conventional deflection yoke.

In the above embodiment, the horizontal deflection winding 1 was explained as being on the high frequency side, but if the vertical deflection winding 3 is on the high frequency side, the vertical deflection winding 3 can of course be placed outside the horizontal deflection winding 1. In this case, the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, in the relative positional relationship of two deflection windings with different frequencies of applied deflection currents, the high frequency loss generated in the windings due to the high frequency deflection current is larger. By arranging the deflection winding outside the low-frequency deflection winding, and configuring the high-frequency deflection winding located outside the low-frequency deflection winding from parallel windings of many thin wires, the eddy current loss generated in the outside deflection winding can be reduced. It is possible to reduce AC losses such as AC losses, and suppress the temperature rise corresponding to the reduced loss, and the high-frequency deflection winding, which has a higher loss than the low-frequency deflection winding, can be moved to a location with lower thermal resistance. This arrangement improves the heat dissipation characteristics of the deflection yoke as a whole, and even if the high-frequency side frequency is increased to 35 Hz or higher to increase image resolution, it is possible to suppress the rise in temperature of each part as much as possible. In addition, a simple and inexpensive improved configuration can be achieved by simply changing the arrangement of the two windings without using any special components to suppress the temperature rise of the insulator, and it is possible to reduce the number of parallel windings of a large number of thin wires. By placing the high-frequency deflection windings on the outside,
An additional effect is that the diameter of the winding wire can be increased to improve the workability of the winding wire.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
Fig. 2 is a side sectional view of a conventional deflection yoke, Fig. 3 is a thermal equivalent circuit diagram of a conventional deflection yoke, Fig. 4 is a thermal equivalent circuit diagram of this embodiment, and Fig. 5 is each part of a conventional deflection yoke. FIG. 6 is a temperature distribution diagram of each part of this embodiment. 1...Saddle type horizontal deflection winding, 2...Separator, 3...Saddle type vertical deflection winding, 4...High magnetic permeability core. In addition, in the figures, the same symbols are the same,
or a significant portion.

Claims (1)

[Claims] 1. A self-concentrating type deflection yoke built into a cathode ray tube, which consists of a saddle-type deflection winding made by winding many fine wires in parallel to which a high-frequency deflection current of 35 Hz or higher is passed, and a separator connected to the saddle-type deflection winding. A saddle-type deflection winding that is arranged in an overlapping manner and is energized with a low-frequency deflection current that generates a magnetic flux perpendicular to the magnetic flux generated from the deflection winding, and a core that covers the outside of these two deflection windings. A high-frequency deflection winding is arranged inside the core in the deflection yoke provided with the
A deflection yoke characterized in that a low frequency deflection winding is arranged inside the high frequency deflection winding with a separator interposed therebetween.