JPH0963508A - Deflection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-priced deflection device capable of reducing a leakage magnetic field which leaks on the tube surface side of a cathode-ray tube from the front opening part of a cylindrical magnetic core by a simple means. SOLUTION: This deflection device comprises a pair of semi-circular cylindrical magnetic cores or an integratedly molded core, and a pair of saddle-like horizontal deflection coils 4 and a pair of saddle-like vertical deflection coils 5 are provided inside a cylindrical magnetic core 1 with a front opening part 2 having a large outer diameter and a rear opening part 3 having a small outer diameter. In the deflection device installed in its in-line color cathode-ray tube 6, a thickness T1 of the front opening part 2 of the cylindrical magnetic core 1 is made into 1/6 to 1/3 of the thickness T2 of the rear opening part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflecting device used by being mounted on a color cathode ray tube having an in-line array electron gun, and more particularly to a leakage magnetic field leaking from the front opening side of the deflecting device to the outside. The present invention relates to a deflecting device capable of reducing unnecessary radiation of the above.

[0002]

2. Description of the Related Art A deflection device of self-convergence, in particular, a deflection device in which both horizontal and vertical deflection coils are deflection type coils (so-called S / S type or saddle type).
The saddle-type deflector) is generally used by being attached to the central portion of the color cathode ray tube 6 as shown in FIG. In addition, the cylindrical magnetic core 1 composed of a pair of semi-cylindrical magnetic cores or an integrally molded core constituting the deflection device has a pair of Kura-type horizontal deflection coils 4 and a pair of Kura-type vertical deflection coils inside thereof. 5 are arranged, and they are arranged so as to be located substantially in the center of the horizontal deflection coil 4 and the vertical deflection coil 5.

In the drawing, 2 is a front opening having a large outer diameter of the cylindrical magnetic core 1, and 3 is a rear opening having a small outer diameter. Reference numeral 7 denotes a horizontal deflection magnetic field generated when a horizontal deflection current is passed through the horizontal deflection coil 4, and 8 of these horizontal deflection magnetic fields 7 is a leakage magnetic field leaking from the front opening 2 side of the cylindrical magnetic core to the outside. Is shown. As a source of the leakage magnetic field leaking from the cathode ray tube display device to the outside, there are a deflection device, a flyback transformer, a size coil, a linear coil and the like. The main source of the leakage magnetic field is the deflection device.

In recent years, the leakage magnetic field 8 has been regulated in consideration of the influence on the human body of the leakage magnetic field 8 leaking from the cathode ray tube display device to the outside. Along with this, various measures have been taken to reduce the leakage magnetic field 8 affecting the human body.

By the way, when reducing the leakage magnetic field leaking from the deflecting device, a leakage magnetic field (not shown) leaking in a direction perpendicular to the cathode ray tube axis or a leakage magnetic field leaking to the rear opening 3 side of the deflecting device is reduced. Has taken a measure to completely shield it by using a magnetic plate such as permalloy or a silicon steel plate. On the other hand, with respect to the leakage magnetic field 8 that mainly leaks to the cathode ray tube surface side, an auxiliary coil (cancellation coil) that generates a magnetic field that cancels the leakage magnetic field 8 is attached to the deflection device or the cathode ray tube to cause the leakage magnetic field. Measures to reduce 8 have been taken.

[0006]

However, among the leakage magnetic fields leaking from the deflecting device to the outside, the leakage magnetic field leaking in the direction perpendicular to the cathode ray tube axis and the leakage magnetic field leaking to the rear opening side of the deflecting device are as follows. Although it was possible to completely shield by using a magnetic plate, it is impossible to sufficiently shield the leakage magnetic field leaking to the cathode ray tube surface side parallel to the cathode ray tube axis. there were.

The above-mentioned auxiliary coil generally generates a magnetic field for canceling the leakage magnetic field leaking from the horizontal deflection coil to the outside. In order to generate a magnetic field for canceling this leakage magnetic field from the auxiliary coil. It was necessary to supply the horizontal deflection current to the auxiliary coil as well. For this reason, there is a big problem that the horizontal deflection sensitivity is deteriorated by 3 to 10%. Further, the auxiliary coil is not only complicated in shape, but also requires a coil bobbin for attaching the auxiliary coil to the deflector, which complicates the manufacturing operation of the deflector and makes the deflector expensive. It was

[0008] Further, the deflection device equipped with the auxiliary coil is more susceptible to changes in characteristics such as convergence, distortion, and landing as compared with the deflection device not equipped with the auxiliary coil. However, there is a drawback in that further adjusting means and adjusting work are required to adjust the characteristics.

An object of the present invention is to solve the above-mentioned problems by a simple means and to reduce the leakage magnetic field leaking from the front opening side of the cylindrical magnetic core to the cathode ray tube tube surface side, and to provide an inexpensive deflecting device. To do.

[0010]

A pair of semi-cylindrical magnetic cores or a cylindrical magnetic core made of an integrally molded core constituting a deflecting device mounted on an in-line color cathode ray tube 6 has a front opening with a large outer diameter. A deflection device including a portion 2 and a rear opening 3 having a small outer diameter, and a pair of Kura-type horizontal deflection coils 4 and a pair of Kura-type vertical deflection coils 5 disposed inside the cylindrical magnetic core. In, the thickness T1 of the front opening 2 of the cylindrical magnetic core 1 is formed to be 1/6 to 1/3 of the thickness T2 of the rear opening 3.

[0011]

The front opening thickness T1 of the cylindrical magnetic core is formed to be 1/6 to 1/3 of the rear opening thickness T2. The leakage magnetic field leaking from the front opening side to the tube surface side of the cathode ray tube display device is reduced without adversely affecting the characteristics of the deflecting device.

[0012]

The present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a cylindrical magnetic core used in the deflecting device of the present invention. In the figure, reference numeral 1 denotes a cylindrical magnetic core, which is composed of a pair of semi-cylindrical magnetic cores or an integrally molded core. Reference numeral 2 denotes a front opening portion having a large outer diameter of the cylindrical magnetic core 1, and 3 denotes a rear opening portion having a small outer diameter. Here, the thickness T1 of the front opening 2 is formed to be 1/6 to 1/3 of the thickness T2 of the rear opening 3.

The reason why the thickness T1 of the front opening 2 is limited to 1/6 to 1/3 of the thickness T2 of the rear opening 3 is that a clear effect of reducing the leakage magnetic field can be obtained within this limited range. In addition, the mechanical strength of the cylindrical magnetic core 1 can be obtained. If the mechanical strength of the cylindrical magnetic core 1 is obtained, the wall thickness T1 of the front opening 2 can be set to 1 of the wall thickness T2 of the rear opening 3. Needless to say, it may be set to / 6 or less.

Reference numeral 7 is a horizontal deflection magnetic field, and 8 is a leakage magnetic field leaking from the front opening side of the cylindrical magnetic core 1. In the deflection apparatus of the present invention, the state of the leakage magnetic field 8 leaking from the front opening 2 side of the cylindrical magnetic core 1 is shown in FIG. 1, and in the conventional deflection apparatus, the leakage magnetic field 8 leaks from the front opening 2 side of the cylindrical magnetic core 1. The state of the leakage magnetic field 8 is shown in FIG. As is clear from the figure, there is a clear difference between the two.

In Table 1, the thickness T2 of the rear opening 3 is set to 8 mm and the thickness T1 of the front opening 2 is changed to measure the front opening of the cylindrical magnetic core 1 used in the deflection apparatus of the present invention. Although the value of the leakage magnetic field 8 leaking from the portion 2 side is shown, as is apparent from the measured value, the thickness T on the front opening 2 side is T.
When 1 becomes 1/3 or less of the wall thickness T2 of the rear opening 3, the value of the leakage magnetic field 8 decreases to 1/2 or less accordingly,
It is understood that a clear effect is obtained in reducing the stray magnetic field 8.

[0016]

[Table 1]

[0017]

According to the present invention, there is provided a saddle-saddle type deflection device capable of significantly reducing the leakage magnetic field leaking from the front opening side of the magnetic core to the cathode ray tube surface side by a simple means. I was able to do it. Further, it becomes possible to provide a deflecting device which is suitable for a saddle-saddle type deflecting device and is inexpensive, without adversely affecting the main characteristics of the deflecting device, and has a great practical effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a magnetic core used in a deflecting device of the present invention and a horizontal magnetic field.

FIG. 2 is a cross-sectional view showing a configuration of a magnetic core used in a conventional deflection device and a horizontal magnetic field.

FIG. 3 is an explanatory diagram showing a state of a deflecting device mounted on an in-line color cathode ray tube and a leakage magnetic field.

[Explanation of symbols]

 1 Cylindrical magnetic core 2 Front opening 3 Rear opening 4 Horizontal deflection coil 5 Vertical deflection coil 6 In-line color cathode ray tube 7 Horizontal deflection magnetic field 8 Leakage magnetic field T1 Front opening thickness T2 Rear opening thickness

Claims (1)

[Claims] 1. A pair of semi-cylindrical magnetic cores or a cylindrical magnetic core composed of integrally molded cores constituting a deflecting device mounted on an in-line color cathode ray tube 6 has a large outer diameter and a front opening 2 and an outer diameter. And a pair of Kura-type horizontal deflection coils 4 and a pair of Kura-type vertical deflection coils 5 inside the cylindrical magnetic core.
In the deflection device having the above-mentioned arrangement, the thickness T1 of the front opening 2 of the cylindrical magnetic core 1 is formed to be 1/6 to 1/3 of the thickness T2 of the rear opening 3. Deflection device.