JPH117909A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke of a high deflection frequency having a small temperature rise. SOLUTION: Air holes 5 for radiation of heat are formed on a separator 1 in a deflection yoke equipped with the separator 1 constituting a supporting body, a horizontal deflection coil 2 installed inside the separator 1, a vertical deflection coil 3 installed outside the separator 1, and a core 4 installed outside the vertical deflection coil 3. As the air heated by the horizontal deflection coil having a very high calorific value passes through the air holes and forms an air-flow flowing out into the outside air, a radiative property is increased to thereby provide an inexpensive deflection yoke having a small temperature rise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on a cathode ray tube, and more particularly to a deflection yoke to which a deflection current of a high frequency is supplied with a reduced temperature rise.

[0002]

2. Description of the Related Art FIG. 4A is a perspective view of a conventional deflection yoke through which a high-frequency deflection current flows, and FIG.
FIG. In FIG. 4, reference numeral 1 denotes a separator constituting a support base, which is formed of a molded article of a heat-resistant synthetic resin material. Reference numeral 2 denotes a saddle-type horizontal deflection coil, which is attached to the inner surface of the separator 1. Reference numeral 3 denotes a saddle type vertical deflection coil, which is attached to the outer surface of the separator 1. Reference numeral 4 denotes a core formed of a high-permeability magnetic material, formed in a shape surrounding the outer peripheral surface of the vertical deflection coil 3, and attached to the outside of the vertical deflection coil 3. At both open ends of the separator 1, a large-diameter side crossover housing 1 a and a small-diameter side crossover housing 1 b are formed to protrude in the radial direction, respectively. The large diameter side crossover line 2a and the small diameter side crossover line 2b are accommodated respectively.

[0003]

A high-frequency sawtooth current is applied to the horizontal deflection coil 2 of the deflection yoke, and a low-frequency sawtooth current is applied to the vertical deflection coil 3. Therefore, an AC loss (skin loss due to copper loss and eddy current loss) occurs in each of the deflection coils 2 and 3, and an iron loss (hysteresis loss and eddy current loss) occurs in the core 4. These losses increase as the frequency of the sawtooth current increases, and the losses increase the temperature of each part of the deflection yoke.

In recent years, means for increasing the horizontal deflection frequency has been adopted to increase the resolution of a displayed image. However, as described above, as the horizontal deflection frequency increases, the loss of the horizontal deflection coil and core increases. In addition, the temperature rise of each part of the deflection yoke increases. This causes a change in the convergence or the like due to the deformation of the separator 1 formed of a synthetic resin molded product and the deformation of the entire deflection yoke, and also causes a decrease in the durability of the deflection yoke due to thermal deterioration of the insulator. .

Considering the size of the heat source of the temperature rise of the deflection yoke, the AC loss generated by the horizontal deflection coil accompanying the increase in the horizontal deflection frequency is larger than the AC loss generated by the vertical deflection coil. , Horizontal deflection frequency is 3
It has been empirically found that the difference becomes significant when the frequency is 5 kHz or more.

Conventionally, in order to suppress the temperature rise of each part of the deflection yoke due to such a high horizontal deflection frequency,
Means such as an increase in the cross-sectional area of the horizontal deflection coil, an increase in the volume of the core, installation of a cooling fan, etc. are taken, but this leads to an increase in cost and an increase in the size of the deflection yoke, which in turn leads to an increase in the size of the cathode ray tube device. There was a problem.

[0007] Further, eddy current loss generated by using a horizontal deflection coil with a large number of thin wire windings or a litz wire as a winding material has also been reduced, but such eddy current loss has been reduced. Even if reduction measures are taken, 100kHz
In the deflection yoke used at the above-described horizontal deflection frequency, the suppression of the temperature rise of each part is not sufficient, which is a major problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a deflection yoke which can suppress a rise in temperature even when used at a high horizontal deflection frequency.

[0009]

A deflection yoke according to the present invention comprises a separator constituting a support base, a horizontal deflection coil mounted inside the separator, and a vertical deflection coil mounted outside the separator. In a deflection yoke having a core mounted outside the vertical deflection coil, a vent hole for heat radiation is formed in the separator.

The heat-dissipating vent is formed in a portion for accommodating the large diameter crossover of the horizontal deflection coil of the separator. Further, the ventilation hole for heat radiation is formed in a portion for accommodating the crossover on the small diameter side of the horizontal deflection coil of the separator. The heat-dissipating ventilation holes are formed in a portion between the large-diameter side and the small-diameter side of the horizontal deflection coil of the separator.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a view showing a deflection yoke according to Embodiment 1 of the present invention. FIG. 1A is a perspective view, and FIG.
Is a longitudinal sectional view thereof. In FIG. 1, reference numeral 1 denotes a separator constituting a supporting base, which is formed of a molded article of a heat-resistant synthetic resin material. Reference numeral 2 denotes a saddle-type horizontal deflection coil, which is attached to the inner surface of the separator 1. Reference numeral 3 denotes a saddle type vertical deflection coil, which is attached to the outer surface of the separator 1. Reference numeral 4 denotes a core formed of a high-permeability magnetic material, formed in a shape surrounding the outer peripheral surface of the vertical deflection coil 3, and attached to the outside of the vertical deflection coil 3. At both open ends of the separator 1, large-diameter-side crossover-housing portions 1 a and small-diameter-side crossover-housing portions 1 b that protrude in the radial direction, respectively.
Are formed, and among these, the horizontal deflection coil 2
The large diameter crossover 2a and the large diameter crossover 2b are respectively accommodated. Reference numeral 5 denotes a vent hole for heat radiation, which is formed on the peripheral surface of the large diameter side crossover housing 1a of the separator 1.

According to the first embodiment, the air heated by the horizontal deflection coil 2 rises toward the large-diameter side along the inner surface of the separator 1 to form an airflow flowing out of the ventilation hole 5 into the outside air. Therefore, the temperature rise of the horizontal deflection coil 2 and the inner surface of the separator 1 in contact with the horizontal deflection coil 2 is reduced by this air flow, and the temperature of the deflection yoke is also reduced.

Embodiment 2 FIG. FIG. 2 is a perspective view showing Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the second embodiment, a ventilation hole 5 for heat dissipation is provided on the peripheral surface of the small diameter side crossover housing 1b of the separator 1. According to the second embodiment, an airflow flowing around the horizontal deflection coil 2 is formed as in the first embodiment.
Due to this airflow, the temperature rise of the inner surface of the horizontal deflection coil 2 and the separator 1 in contact therewith is reduced, and the temperature of the deflection yoke is also lowered.

Embodiment 3 FIG. 3 is a perspective view showing Embodiment 3 of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the third embodiment, a ventilation hole 5 for heat radiation is provided in a portion between the large diameter side crossover wire accommodating portion 1a and the small diameter side crossover wire accommodating portion 1b of the separator 1. According to the third embodiment, similarly to the first and second embodiments, the airflow flowing around the horizontal deflection coil 2, the separator 1 in contact with the horizontal deflection coil 2, and the vertical deflection coil 3 is formed. The rise is small and the temperature of the deflection yoke is also low.

In the first to third embodiments, the airflow flowing around the horizontal deflection coil 2 is formed by providing the heat-dissipating air holes 5 so that the temperature rise of the horizontal deflection coil 2 is reduced and the deflection is performed. Although it has been described that the temperature of the yoke is lowered, in addition to this, it is possible to suppress an increase in the coil size of the horizontal deflection coil, an increase in the core volume, etc. Since the number is reduced, there is also an effect that the cost can be reduced. In addition, by combining the installation positions of the ventilation holes 5 described in the first to third embodiments, the effect of suppressing the temperature rise can be improved.

[0016]

As described above, in the deflection yoke according to the present invention, the ventilation holes for heat radiation are formed in the separator constituting the horizontal deflection coil, the vertical deflection coil and the core support base. The air heated by the horizontal deflection coil having a particularly large calorific value generates an air flow that flows through the through-hole and flows into the outside air, so that the heat radiation property is increased, the temperature rise is small, and an inexpensive deflection yoke is provided. There is an effect that can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view and a longitudinal sectional view of a deflection yoke according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a deflection yoke according to Embodiment 2 of the present invention.

FIG. 3 is a perspective view of a deflection yoke according to Embodiment 3 of the present invention.

FIG. 4 is a perspective view and a longitudinal sectional view of a conventional deflection yoke.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Separator, 1a Large diameter crossover wire accommodation part, 1b
Small-diameter side crossover housing, 2 horizontal deflection coils, 3 vertical deflection coils, 4 cores, 5 ventilation holes for heat dissipation.

Claims (4)

[Claims] 1. A separator constituting a support base, a horizontal deflection coil mounted inside the separator, a vertical deflection coil mounted outside the separator, and a core mounted outside the vertical deflection coil. A deflection yoke, characterized in that a ventilation hole for heat radiation is formed in the separator. 2. The deflection yoke according to claim 1, wherein the heat-dissipating ventilation hole is formed in a portion for accommodating the crossover wire on the large-diameter side of the horizontal deflection coil. 3. The deflection yoke according to claim 1, wherein the heat-dissipating ventilation hole is formed in a portion for accommodating a crossover on the small-diameter side of the horizontal deflection coil. 4. The deflection yoke according to claim 1, wherein the heat-dissipating air holes are formed in a portion between the large-diameter side and the small-diameter side of the horizontal deflection coil.