JPH0212743A - Deflection yoke - Google Patents

Abstract

PURPOSE:To suppress the temperature rise and to improve the reliability without raising the cost by providing to erect ribs along the circumferential direction at the outer surface of a coil separator cone. CONSTITUTION:At the outer periphery of a coil separator cone 2, plural ribs 8 along the circumferential direction are provided to erect placing adequate intervals. The surface area of the coil separator cone 2 is increased by the ribs 8, and flow ways to promote the thermal transition are formed between the outer surface of the coil separator cone 2 and a vertical deflecting coil and the like. By such a constitution, the temperature rise following the high-frequency wave deflection can be suppressed without raising the cost, and the reliability and the economy can be improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a deflection yoke for a picture tube device, and particularly relates to an improvement of the deflection yoke for a picture tube device used in the display field. be.

(Prior Art) Picture tubes (hereinafter referred to as CRTs) are used in, for example, display devices used in televisions, computer terminals, and the like. In recent years, there has been a strong demand for higher resolution and higher density in such display devices in order to realize high-definition televisions, etc. Specifically, for example, in the case of shadow mask type color CRTs, Technological developments have been made to improve the definition of the shadow mask pitch, to make the electron beam spot smaller, to reduce misconvergence, and to deflect high-frequency waves around the CRT.

Among these technological developments, high-frequency deflection around CRTs has mainly focused on improvements to the deflection yoke for deflecting electron beams. Specifically, improvements have been made to the horizontal deflection coil by using Lindt wire and by changing the core material. Attempts are being made to reduce losses.

A self-convergence type deflection yoke is generally used for the deflection yoke of a shadow mask type color CRT, and this type of deflection yoke sets the magnetic field produced by the crutch-shaped horizontal deflection coil to a binction type magnetic field, and Misconvergence and deflection distortion are corrected by making the magnetic field produced by the toroidal vertical deflection coil into a barrel magnet W.

8 to 10 show conventional examples of the general deflection yoke 1 as described above. In these figures, 2 is a coil separator cone portion, and a pair of crescent-shaped horizontal deflection coils 3 are disposed oppositely above and below the inner peripheral surface of the cone portion. The hollow-shaped horizontal deflection coil 3 is made by winding a conducting wire around a hollow-shaped metal mold and melting and solidifying a solidifying agent that has been coated on the conducting wire in advance in the metal mold, thereby forming the hollow-shaped horizontal deflection coil 3 during operation. The deformation in is made small. The coil separator cone portion 2 is a coil separator cone portion 2 which will be described later.
An injection molded product made of polypropylene resin or the like is used together with the rear part, and its elastic force holds down the crescent-shaped horizontal deflection coil 3 and fixes it so that it does not shift, and also serves as an electrical insulating member for the crucified horizontal deflection coil 3. is also functioning. Further, a toroidal vertical deflection coil 5 directly wound around a ferrite core 4 is attached to the outer circumference of the coil separator cone portion 2, and a pair of toroidal horizontal deflection coils at the coil separator rear part 6 are attached. A differential correction coil 7 for correcting variations in impedance between the pair of crescent-shaped horizontal deflection coils 3 is attached to the upper surface portion 6a in the same direction as the opposing direction of the coils 3.

6b is the lower surface part of the coil separator rear part 6. Formal wire is used for the above-mentioned saddle-shaped horizontal deflection coil 3, toroidal-shaped vertical deflection coil 5, and differential correction coil 7, and for the core of the ferrite core 4 and differential correction coil 7, for example, Mn-Zn is used. -MQ material is used.

A general deflection yoke 1 configured as described above is
On the other hand, as an improvement measure accompanying the shift to high-frequency deflection, we have changed the horizontal deflection coil 3, which generates the most heat, from formal wire to wire, and also replaced the ferrite core 4 with, for example, Mn-
Attempts have been made to reduce loss by changing from Zn-MO material to 1yjn-Zn material.

However, even if such improvements are made in terms of materials, the temperature rise of the deflection yoke when used for horizontal deflection of 32 kHz using the deflection yoke configured as described above, for example, is about 20 to 50 degrees Celsius above room temperature. The temperature rises to about 80 to 110°C in an atmosphere of 60°C. in this way,
As the horizontal deflection frequency increases, the temperature rise in the deflection yoke occurs because eddy current loss and skin loss increase in the deflection coil, eddy current loss and hysteresis loss increase in the ferrite core, and this increases the temperature of the deflection yoke itself. This is because it appears as a fever.

However, when such a temperature rise occurs in the deflection yoke, the crescent-shaped horizontal deflection coil 3 and the coil separator 2.6 are deformed, and the toroidal-shaped vertical deflection coil 5, which is wound once directly around the ferrite core 4, becomes deformed. The relative position shift causes misconvergence and deflection distortion. In addition, impedance changes occur in the crutch-shaped horizontal deflection coil 3, toroidal-shaped vertical deflection coil 5, differential correction coil, etc., and considering the increase in frequency to 64 kHz, it must be said that there is no longer any margin in terms of reliability. I don't get it.

In addition, in order to suppress the temperature rise of conventional deflection yokes, fans are used to air-cool them, but in this case, the increased cost, increased power of the fan motor, and generation of noise are ignored. become unable to do so.

(Problems to be Solved by the Invention) In the conventional deflection yoke configuration, there was a problem in that the temperature upper limit associated with high-frequency deflection was too large, causing misconvergence and deflection distortion, resulting in a lack of reliability.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a deflection yoke that can suppress temperature rise and improve reliability without any particular increase in cost.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the first invention provides a horizontal deflection coil installed on the inner circumference of the illumination separator cone portion and a vertical deflection coil on the outer circumference. In a deflection yoke in which a deflection coil is installed, a rib is provided upright along the circumferential direction on the outer peripheral surface of the coil separator cone portion.

A second invention is a deflection yoke in which a horizontal deflection coil is installed on the inner peripheral side of a coil separator, and a gap between the horizontal deflection coil and the coil separator has a thermal conductivity of 1X.
The gist is that it is filled with a substance of 10-4 (cal/c+++ sea'C) or more.

Further, in a third invention, a pair of horizontal deflection coils are installed facing each other inside a coil separator, and a differential correction coil for impedance correction between the pair of horizontal deflection coils is installed at a rear part of the coil separator. In the deflection yoke, holes are formed at both ends of the coil separator in the same direction as the opposing direction of the pair of horizontal deflection coils at the rear of the coil separator, and the differential correction coil is arranged at both ends at the rear of the coil separator. The gist is that it is attached to a portion other than the surface portion substantially parallel to the opposing direction of the pair of horizontal deflection coils.

(Function) In the first invention, the surface area of the coil separator cone is increased by the ribs provided upright on the outer circumferential surface of the coil separator cone, and the vertical deflection coil is connected to the outer surface of the coil separator cone. A flow path that promotes heat transfer is formed between the horizontal deflection coils and the like, so that heat generated from the horizontal deflection coil and the like is efficiently dissipated.

Furthermore, the upright arrangement of the ribs increases the mechanical strength of the coil separator cone portion, thereby suppressing deformation of the coil separator due to temperature rise.

In the second invention, the material filling the gap between the horizontal deflection coil and the coil separator improves thermal conductivity between the horizontal deflection coil and the coil separator. Therefore, the heat generated by the horizontal deflection coil is transferred to the coil separator through the filling material, and is efficiently radiated into the air from the coil separator having a large surface area. The filling material has a thermal conductivity of 1×
Below 10°4 (cal/am sec "C), heat transfer from the horizontal deflection coil to the coil separator is not sufficient and the heat dissipation effect is reduced. Also, the horizontal deflection coil is fixed to the coil separator by the filling material. Deformation due to temperature rise is reduced, and positional deviation with the vertical deflection coil is suppressed.

Further, in the third invention, the upper and lower portions of the coil separator contact portion,
The holes drilled in both end faces create a chimney effect, and the heat generated from the horizontal deflection coil is efficiently radiated. In addition to improving the heat dissipation from the horizontal deflection coil, the temperature rise is suppressed by changing the mounting position of the differential correction coil, and the temperature rise of the entire deflection yoke is suppressed.

Therefore, according to each of the above-mentioned inventions, the temperature increase due to high frequency deflection can be suppressed without any particular increase in cost.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 and 2 are diagrams showing a first embodiment of the present invention.

In addition, in FIGS. 1, 2, and the figures showing each embodiment described later, the same or equivalent members and parts as in FIGS. 8 to 10 are indicated by the same reference numerals. , duplicate explanations will be omitted.

First, to explain the configuration of the deflection yoke 10, in this embodiment, the coil separator cone portion 2 is formed by injection molding using polypropylene resin with a melt index of 4.5 (g/10 m1 n) + 7), and the coil A plurality of grooves 8 are provided along the circumferential direction on the outer peripheral surface of the separator cone portion 2 at appropriate intervals. Each rib 8 is set at a height that contacts the toroidal vertical deflection coil 5, so that a flow path for heat dissipation is formed between each rib 8. In addition, as shown in FIG. 1, each rib 8 is partially cut out in the circumferential direction corresponding to the upper and lower parts in the vertical direction with respect to the horizontal deflection direction of the electron beam, and each of the above-mentioned flow paths is formed in the circumferential direction. It is opened to the outside at the notch.

As described above, the coil separator cone part 2 has a plurality of ribs 8 erected thereon, the hollow-shaped horizontal deflection coil 3 installed on its inner periphery, and the toroidal-shaped vertical deflection coil 5 installed on its outer periphery. A self-convergence type deflection yoke 10 is constructed by the above.

Next, the operation of the deflection yoke 10 configured as described above will be explained. The measurement results of the temperature rise of each component part when the deflection yoke 10 is attached to a 30-inch shadow mask type collar and operated with a horizontal deflection of 32kHz7 at an ambient temperature of 60°C are shown in this section together with comparative examples. It is shown in Table 1. In the comparative example, a deflection yoke composed of a coil separator, a cone portion, etc. without ribs as shown in FIG. 8, etc., is attached to a shadow mask type color CRT similar to the above.

From the results in Table 1 above, it can be seen that the temperature rise in this example was lower than that in the comparative example. Additionally, the upright arrangement of the ribs 8 increases the mechanical strength of the coil separator cone portion 2, suppresses deformation of the coil separator due to temperature rise, prevents misconvergence, etc., and improves reliability. . Furthermore, the coil separator with the ribs 8 erected can be easily produced by partially changing the shape of the mold in injection molding, and the manufacturing effort is almost the same as that of the conventional one.

Next, FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, a thermal conductivity of 1 x
It is filled with a substance 9 of 10-4 (cal/cm sea'C) or more. Deflection yoke 2 shown in Figure 3
In example 00, the filling material 9 is, for example, silicone grease (manufactured by Toshiba Silicone ■, YG-6240, thermal conductivity:
2X 10'cal/am sec'C) is used. In addition to the above-mentioned silicone grease, the filling material 9 may be a material that has electrical insulation properties such as rubber, plastic, or adhesive, that can be filled into gaps, and that has thermal conductivity as described above. If available, these can also be used.

Next, the deflection yoke 20 described above is attached to a shadow mask type color CRT similar to that of the first embodiment, and
Table 2 shows the measurement results of the temperature rise of each component when operated at a horizontal deflection of 32kl-1z at an ambient temperature of .degree. C., along with comparative examples. In the comparative example, the deflection yoke shown in FIG. 8 and the like without the filling material is attached to the same shadow mask type collar CR-r as described above.

From the results in Table 2 above, it can be seen that the temperature rise of the horizontal deflection coil in this example is lower than that in the comparative example. The filling material 9 has a thermal conductivity of I
Below X 10' (cat/Cra sec 'C), heat transfer from the saddle-shaped horizontal deflection coil 3 to the coil separator cone portion 2 is not sufficiently carried out, and the heat dissipation effect as described above is reduced.

In addition, a test pattern as shown in Fig. 4(a) was projected at an ambient temperature of 60°C using a shadow mask type color CRT (30-inch type) equipped with each of the deflection yokes of the present example and the comparative example. After a period of time, the condition of the screen was observed. In FIG. 4, 11a is a red pattern, 1
1b is a 31ue pattern. As a result, in the comparative example, after 8 hours, the screen appeared as shown in FIG. 4 (D) and misconvergence occurred. On the other hand, in the case of the device equipped with this example, the state shown in FIG. 4(a) was maintained even after 8 hours, and it was confirmed that no misconvergence occurred.

5 to 7 show a third embodiment of the present invention.

In this embodiment, the end surfaces of the coil separator/rear part 6 are aligned in the same direction as the inward direction of the pair of damp horizontal deflection coils 3, that is, in the direction perpendicular to the horizontal deflection direction of the electron beam by the damp horizontal deflection coils 3. Holes (openings) 12a and 12b are formed in a certain upper surface and a lower surface, respectively.

In addition, the differential correction coil 7 is connected to the coil separator/rear part 6.
The portion other than the above-mentioned upper surface portion and lower surface portion in , that is, the fifth
In the example shown in the figures, it is attached to the side thereof in substantially parallel to the opposing direction of the pair of horizontal deflection coils 3. That is, the differential correction coil 7 is attached to the side of the coil separator/rear part 6 so that its coil axis is perpendicular to enhance the heat dissipation effect.

Next, the deflection yoke 30 configured as described above is replaced with a shadow mask type color CR similar to that of the first embodiment.
Table 3 shows the measurement results of the temperature rise of each component when the device was attached to a T and operated under horizontal deflection of 32 kHz at an ambient temperature of 60° C., along with Comparative Example 1.2. In Comparative Example 1, the conventional deflection yoke shown in FIG. Although holes are formed in the upper and lower surfaces, the differential correction coil 7 uses a deflection yoke mounted in a conventional position, similar to that shown in FIG. 8.

(Left blank below) Table From the results in Table 3 above, the results of this example are as follows: Comparative Example 1.
It can be seen that the temperature rise is reduced compared to No. 2. Further, the coil separator 2.6 in which holes 12a and 12b are formed in the upper and lower surfaces of the coil separator/rear part 6, respectively, can be easily created by partially changing the shape of the mold in injection molding. Since the differential correction coil is simply changed in its mounting position, the manufacturing effort is almost the same as that of the conventional one.

Although the deflection yoke shown in each of the above embodiments is of a type called a semi-toroidal type, the present invention can also be applied to other types such as a saddle-saddle type.

[Effects of the Invention] As explained above, according to the first invention, the surface area of the coil separator cone increases due to the ribs provided upright on the outer peripheral surface of the coil separator cone. Since a flow path that promotes convective movement of heat is formed between the outer circumferential surface of the section and the vertical deflection coil, heat generated from the horizontal deflection coil and the like can be efficiently radiated. Further, by providing the ribs upright, the mechanical strength of the coil separator cone portion is increased, and deformation of the coil separator due to temperature rise can be suppressed.

According to the second invention, the filling material in the gap between the horizontal deflection coil and the coil separator improves the thermal conductivity between the horizontal deflection coil and the coil separator, so that the heat generated by the horizontal deflection coil is absorbed through the filling material. A coil with a large surface area can efficiently dissipate heat from the pallet. Also,
The filling material allows the horizontal deflection coil to be fixed to the coil separator to prevent deformation due to temperature increases.

Furthermore, according to the third aspect of the present invention, the chimney effect is produced by the holes formed in the upper and lower and both end surfaces of the rear part of the coil separator, so that the heat generated from the horizontal deflection coil can be efficiently radiated. Furthermore, by mounting the differential correction coil substantially parallel to, ie, perpendicular to, the opposing direction of the pair of horizontal deflection coils, the heat dissipation effect is enhanced and temperature rise can be suppressed. Therefore, the temperature rise of the entire deflection yoke can be suppressed.

As described above, each of the inventions has the advantage of being able to suppress the temperature rise associated with high-frequency deflection without any particular increase in cost, thereby improving reliability and economic efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the coil separator/lator portion in a first embodiment of the deflection yoke according to the present invention, FIG. 2 is a perspective view of the first embodiment of the same with the coil separator/cone portion cut away, and FIG. 3 4 is a vertical sectional view showing the second embodiment of the present invention.
The figure shows a misconvergence test example of the second embodiment of the above using a test pattern, and FIGS. 5 to 7 show the third embodiment of the present invention. FIG. A perspective view showing how the differential compensation coil is installed, FIG. 6 is a vertical cross-sectional view of the main part, FIG. 7 is a side view of the coil separator/contact part showing the differential compensation coil cut away, and FIGS. Fig. 10 shows a conventional deflection yoke, Fig. 8 is a perspective view of the coil separator cone section cut away, and Fig. 9 is a perspective view of the coil separator section.
FIG. 10 is a longitudinal sectional view of a portion near the rear of the coil separator, and FIG. 11 is a longitudinal sectional view of the portion near the rear of the coil separator of a deflection yoke configured as Comparative Example 2 of the third embodiment. 2: Coil separator cone section, 3: Swelled horizontal deflection coil, 5 Nidroidal vertical deflection coil, 7: Differential correction coil, 8: Rib, 9: Fill l
quality, 12a, 12b: hole, 10.20, 30: deflection yoke.

Claims (3)

[Claims] (1) In a deflection yoke in which a horizontal deflection coil is installed on the inner periphery of a coil separator cone and a vertical deflection coil is installed on the outer periphery, A deflection yoke characterized by having ribs erected along it. (2) In a deflection yoke in which a horizontal deflection coil is installed on the inner circumferential side of a coil separator, the thermal conductivity is 1×10^-^ in the gap between the horizontal deflection coil and the coil separator.
A deflection yoke characterized in that it is filled with a substance of 4 (cal/cm sec °C) or more. (3) In a deflection yoke, a pair of horizontal deflection coils are installed facing each other inside a coil separator, and a differential correction coil for impedance correction between the pair of horizontal deflection coils is attached to the rear of the coil separator. ,
Holes are formed in both end surfaces of the coil separator in the same direction as the opposing direction of the pair of horizontal deflection coils, and the differential correction coil has holes in the rear portion of the coil separator other than the opposite end surfaces. A deflection yoke characterized by being installed substantially parallel to the opposing direction of a pair of horizontal deflection coils.