JPS61114444A - Deflection york - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a deflection yoke used in a cathode ray tube, and more particularly to a deflection yoke that enables high-speed deflection.

[Background of the invention]

In conventional deflection yokes that require high-speed deflection, Utility Model Application No. 57-10726 was developed to reduce eddy current loss in the deflection coil, loss due to skin effect, and heat generation in the coil itself.
As described in Publication No. 5 and Japanese Utility Model Application Publication No. 59-57844, single-stranded wires (hereinafter referred to as Litz wires), which are made by twisting a plurality of wires with small wire diameters, are used; Due to restrictions on circuit elements and the like associated with the increased FLK, it is necessary to increase the number of strands of wire in one turn in order to reduce the inductance L of the deflection coil and keep the coil cross-sectional area constant.

In this case, as described in JP-A No. 58-23106, the effective loss resistance R at high frequencies increases due to the effect of adjacent parallel conductors, and L/R (a value proportional to the coil cross-sectional area) at the operating frequency increases. decreases, resulting in a significant increase in the temperature of the deflection coil. However, all of the above-mentioned known examples only describe methods for reducing the temperature rise of the coil itself, which poses a problem with heat generation, but do not consider loss due to skin effect (proximity effect) from other conductors. .

[Purpose of the invention]

An object of the present invention is to reduce the temperature rise of the horizontal deflection coil due to an increase in loss resistance (proximity effect) due to the influence of the skin effect and close parallel conductors between horizontal and vertical deflection coils and both deflection coils. The objective is to provide a deflection yoke that

[Summary of the invention]

In this deflection yoke, the coil conductors constituting the vertical deflection coil are twisted into two or three conductors, with one unit consisting of two or three twists, or the conductors are further twisted multiple times. With the vertical deflection coil,
This reduces the skin effect (proximity effect) of the horizontal deflection coil, which is another coil conductor that is wound in close proximity to this, and reduces the temperature rise of the horizontal deflection coil when the horizontal deflection coil is driven at a high deflection frequency. This was a lecture.

[Embodiments of the invention] The present invention will be explained below with reference to embodiments shown in the drawings.

Figure 1 is a perspective view showing the deflection yoke of the present invention, which uses a core provided with a slot portion with good deflection ability for high-definition displays. Figure 2 is a cross-sectional view of this, in which a horizontal deflection coil and a vertical deflection coil are wound around the slot portion of the core.

In addition, as shown in Figure 3, in the deflection yoke of the present invention, the horizontal deflection coil driven at a high deflection frequency is constructed of litz wire to reduce coil loss due to the skin effect, and to reduce the deflection The vertical deflection coil, which is frequency-driven and is extremely unaffected by the skin effect, is also constructed of litz wire. For more details, see 1. ? Figure 4 (a
As shown in the JK horizontal single-direction coil, for example, a 4-layer wire made of 34 strands made by repeating 3 twists 4 times as a unit was used. As shown in the vertical deflection coil, in one embodiment, the vertical deflection coil is composed of a quintuple litz wire formed of 51 strands in which the three twists described above are repeated three times as one unit.

Now, the proximity effect means that the loss resistance increases due to the influence of nearby parallel conductors, so just having a vertical deflection coil conductor made of a normal single wire near the horizontal deflection coil will cause the horizontal deflection to increase. The loss resistance of the coil increases at high deflection frequencies, resulting in increased temperature rise of the horizontal deflection coil.

Therefore, in the deflection yoke according to the present invention, the vertical deflection coil is also composed of multilayered wires as described above, and the increased loss resistance that the horizontal deflection coil receives due to the magnetic field created by the eddy current can be compensated for by using a thin wire conductor. In addition to reducing eddy currents, the coil conductor is twisted with litz wire to reduce the number of parallel conductors with the horizontal deflection coil, thereby reducing the increase in loss resistance due to the proximity effect. Therefore, by configuring the vertical deflection coil with multiple wires, it is possible to obtain the effect of reducing the temperature rise of the horizontal deflection coil, which is another coil conductor.

As an example, the horizontal deflection coil is composed of 34 straight wires of 0.09-, and the vertical deflection coil is composed of a single wire of 0.4-
Comparing the temperature rise values in the case of 31 Litz wires, it is found that the vertical deflection coil and the Litz wire configuration have the effect of reducing the temperature rise value of the horizontal deflection coil by 20°C. From the above, it can be seen that multi-twisting the vertical deflection coil, which is a coil conductor different from the horizontal deflection coil, is effective in reducing the temperature rise of the horizontal deflection coil.

〔Effect of the invention〕

According to the present invention, it is possible to reduce the increase in loss resistance (proximity effect) due to the influence of the skin effect and adjacent parallel conductors between the horizontal and vertical deflection coils and both deflection coils, thereby reducing the temperature rise of the horizontal deflection coil. effective.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the deflection yoke according to the present invention, Figure 2 is a cross-sectional view of the deflection yoke according to the present invention, Figure 3 is a perspective view of a cross-section of the main part of the deflection yoke according to the present invention, and Figure 4 (Al is the same as the book). FIG. 4 is a perspective view showing the litz wire of the horizontal deflection coil according to the invention (bl is a perspective view showing the litz wire of the vertical deflection coil according to the invention. 1 - Deflection yoke, 2 - Horizontal deflection coil, 3... Vertical deflection coil, 4-- Core, 4a... Core protrusion,
5... Core slot portion, 6... Shasa, 7...
・Litz wire, 8... bare wire. '$3 v17 Figure 2nd Flash

Claims (1)

[Claims] The coil conductor constituting the vertical deflection coil is composed of a stranded wire consisting of a plurality of conductor wires as one unit, and a conductor group formed by twisting the stranded wire group which is a plurality of stranded wires multiple times. A deflection yoke characterized by reducing the skin effect (proximity effect) of a horizontal deflection coil arranged in close proximity to the horizontal deflection coil and reducing the temperature rise of the horizontal deflection coil when the horizontal deflection coil is driven at a high deflection frequency.