JPH03187205A - Deflection yoke - Google Patents

Abstract

PURPOSE:To restrain a temperature rise of a deflection yoke effectively and to prevent change of convergence and deterioration of durability by arranging a heat sink of high heat conductivity and high electrical resistance between a magnetic core and a separator. CONSTITUTION:A heat sink 6 having high heat conductivity and high electrical resistance is fixed to a highly permeable core 4 by an adhesive material 7. Since the heat sink 6 itself does not generate heat, a temperature of a radiation fin 6a which is in contact with the air is low. Therefore, heat generated by a horizontal deflection coil 2 is transmitted through the heat sink 6 due to a temperature difference between a temperature of an area of the heat sink 6 held by a separator 3 and the core 4 and a temperature of the radiation fin 6a which is in contact with the air and released effectively in the air; a temperature rise of the horizontal deflection coil 2 is restrained. Heat generated in the core 4 is also transmitted through the heat sink 6 and released in the air. Thereby, a deflection yoke can be acquired, which does not cause change of convergence and lowering of durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a deflection yoke mounted on a cathode ray tube, and particularly to a deflection yoke with improved high resolution and large deflection angle.

[Conventional technology]

Figure 3 is a vertical cross-sectional view of a conventional deflection yoke, and Figure 4 is its A.
- A sectional view, shown in the figure), (1) & more dollars =
It is a toroidal type deflection yoke, and includes a horizontal deflection coil (2) wound in a saddle shape, and a high magnetic permeability core (4) provided outside of this horizontal deflection coil (2) with a separator (3) in between. , a toroidally wound vertical deflection coil (5
).

In the above configuration, horizontal and vertical deflection coils (2);
When a sawtooth wave deflection current for scanning is applied to (5),
A deflection magnetic field is generated. At the same time, both these coils (2
), (5) generate alternating current losses (copper loss, eddy current loss, and skin loss), and on the other hand, iron loss (hysteresis loss, eddy current 11t) occurs in the core (4). These losses increase as the frequency of the deflection current flowing through the coils (2) and (5) increases, and as the deflection current increases.

By the way, in recent years, a method of increasing the frequency of the horizontal deflection coil (2) side has been adopted to increase the resolution of images, and wide-angle deflection is required to obtain a large screen, so it is necessary to increase the deflection current. It is supposed to be done. As a result, the temperature rise in each part of the deflection yoke (1) becomes even greater.
Deterioration of the characteristics of the core (4), deformation of the separator (3), deformation of the entire deflection yoke, resulting in convergence changes, and reduction in the durability of the deflection yoke (1) due to thermal deterioration of the insulator. There were problems such as causing

In order to suppress the temperature rise of each part of the deflection yoke (1), for example, the cross-sectional area of the coil and the core volume are Countermeasures are being taken such as increasing the amount of noise and installing cooling fans, but it is difficult to obtain a sufficient cooling effect, especially when scanning at a high frequency such as 130KIIz or scanning at a deflection angle of 110°. I couldn't do it.

[Problem to be solved by the invention]

This invention was made in order to eliminate the conventional problems as described in item 2, and effectively suppresses the temperature rise of the deflection yoke even during high frequency scanning or when it is necessary to increase the deflection II flow. The object of the present invention is to obtain a deflection yoke that does not cause changes in convergence or decrease in durability.

[Means to solve the problem]

The deflection yoke according to the present invention has a magnetic core, a horizontal deflection coil, a vertical deflection coil, and a separator that isolates the horizontal deflection coil and the vertical deflection coil. It is equipped with a conductive and high electrical resistance heat sink.

[For production]

In the deflection yoke of this invention, a heat sink with high thermal conductivity and high electrical resistance is arranged between the separator that separates the horizontal deflection coil and the vertical deflection coil, and the magnetic core. Heat generated by AC loss and iron loss in the deflection coil and magnetic core is efficiently dissipated to the outside through this heat sink, thereby suppressing temperature rise.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of a deflection yoke according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line B--B.

In the figure, parts that are the same as the conventional one are given the same reference numerals and explanations are omitted. 6 (6) is a heat sink with high thermal conductivity and high electrical resistance, and (6a) is a heat sink at both ends of the heat sink (6). The heat sink (6) is a heat dissipation fin that has been used as a heat dissipation fin (7).
is fixed to the high permeability core (4).

Next, the operation will be explained.

When the deflection yoke (1) is operated in the same way as before, AC losses such as copper loss generated in the horizontal deflection coil (2) and the vertical deflection coil (5) cause the horizontal deflection coil (2) and the vertical deflection coil (5) to ) temperature increases.

Further, iron loss occurs in the core (4), and the temperature of the core (4) also increases. Most of the heat generated by the horizontal deflection coil (2) passes through the separator (3) and is transmitted to the heat sink (6). Since the heat sink (6) itself does not generate heat, the heat sink (6a) in contact with the surrounding air is at a low temperature.

Therefore, the heat generated by the horizontal deflection coil (2) is transferred to the heat sink (
6) The temperature of the part sandwiched between the separator (3) and the core (4) and 5 the heat dissipation fin (6a) in contact with the surrounding air.
Due to the temperature difference, the heat is efficiently released into the air through the heat sink (6), so the temperature rise of the horizontal deflection coil (2) is suppressed. Furthermore, the heat generated in the core (4) is similarly transmitted through the heat sink (6) and released into the surrounding air. Therefore, the temperature rise in the core (4) is also suppressed. More cores (4)
When the temperature of the vertical deflection coil (5) is low, the amount of heat generated in the vertical deflection coil (5) that is transferred to the core (4) increases, so that the temperature rise of the vertical deflection coil (5) is also suppressed.

As a result, the frequency of the deflection current can be increased to improve the image resolution, and the deflection current can also be increased, making wide-angle deflection possible.

In the above embodiment, a saddle-toroidal type deflection yoke has been described, but the present invention is not limited to this, and the same effect can be obtained even if a toroidal-toroidal type or saddle-saddle type deflection yoke is used.

〔Effect of the invention〕

As described above, according to the present invention, since a heat sink with high thermal conductivity and high electrical resistance is arranged between the magnetic core and the separator, the temperature rises even when the deflection yoke is operated at high frequency and large deflection current. can be kept low, thereby providing a deflection yoke that does not cause convergence changes or decreases in durability.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a deflection yoke according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line B-B, FIG. 3 is a vertical cross-sectional view of a conventional deflection yoke, and FIG. 4 is a cross-sectional view taken along line A-A. FIG. In each figure, the same reference numerals indicate the same or corresponding parts, (1)
is a deflection yoke, (2) is a horizontal deflection coil, (3) is a sehalator, (4) is a high permeability core, (5) is a vertical deflection coil, (6) is a heat sink, (6a) is a heat sink, ( 7) is an adhesive.

Claims (1)

[Claims] (1) In a deflection yoke that has a magnetic core, a horizontal deflection coil, a vertical deflection coil, and a separator that isolates the horizontal deflection coil and the vertical deflection coil, there is a high thermal conductivity and high electrical resistance between the magnetic core and the separator. A deflection yoke characterized by having a heat sink arranged therein.