KR20010036055A - Cathode ray tube - Google Patents

Abstract

PURPOSE: A cathode ray tube is provided to have a deflecting yoke capable of reducing a deflecting power of the cathode ray tube. CONSTITUTION: A panel(11) has a rectangular shape, and a funnel(13) is connected to the panel(11). A neck(15) is connected to the funnel(13), and a fluorescent screen(17) is formed in the panel(11). A deflecting yoke(19) is mounted at a boundary between the funnel(13) and the neck(15) and consists of a separator(19a), a horizontal deflecting coil(19b) and a vertical deflecting coil(19c). The shape of a mounting part, on which the deflecting coils(19b,19c) are mounted, is increasingly varied from a round shape to a non round shape extending from a small aperture part to a large aperture part. A ferrite core(19d) is formed such that a direct distance from a tube axis of a cathode ray tube to any point, a thickness corresponding thereto and a rate of the thickness to the direct distance become uniform according to an angle formed between the first axis and the second axis. The first axis is parallel with a length-wide direction of the panel(11), and the second axis is vertical to the first axis.

Description

Cathode Ray Tube {CATHODE RAY TUBE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube acting as a color television, a monitor, or the like, and more particularly to a cathode ray tube having a deflection yoke, which is advantageous for reducing the deflection power of the cathode ray tube.

As is well known, a cathode ray tube is an electron tube that realizes an image by deflecting an electron beam emitted from an electron gun in a horizontal and vertical direction with respect to a screen so that the electron beam lands on a phosphor of the screen.

Such cathode ray tubes are mainly installed in color televisions, computer monitors, and the like, and have recently been applied to high-end products such as high-definition televisions (HDTVs).

Here, the cathode ray tube is applied to high-definition television or other office automation (OA) equipment, or the screen brightness is increased, so that the deflection yoke's deflection frequency is increased and the electric field is shortened. For this purpose, wide angle is indispensable. In such technical matters, the deflection power is increased, which causes the leakage magnetic field and the increase in power consumption.

That is, in improving the quality of cathode ray tube, the problem due to the increase in deflection power remains an important problem.

To this end, conventionally, attempts have been made to reduce the diameter of the neck portion so that the deflection magnetic field generated by the deflection yoke is closer to the trajectory of the electron beam, thereby improving the efficiency of the deflection yoke for the electron beam.

However, in this technology, due to the neck portion which is smaller than in the related art, not only the design of the electron gun but also the outer curvature of the funnel has to be designed differently, the cathode ray tube must be manufactured. There is a problem that it is not enough compared to the existing cathode ray tube.

On the other hand, the cathode ray tube on the other hand, while the neck diameter has a general size (approximately, 29.1φ), while trying to reduce the deflection power by reducing the outer diameter of the neck portion side of the funnel than the prior art.

However, there is a problem to be solved even in this technique, which results in a so-called Beam Strike Neck (BSN) phenomenon in which an electron beam that reaches the corner of the screen impinges on the inner wall of the neck of the funnel. Will not achieve good.

Therefore, in recent years, in order to solve the said problem, the technique which comprises a cathode ray tube is made so that the outer periphery shape of the funnel to which a deflection yoke is mounted may change from circular shape to a non-circular shape from a neck part side to a panel side. In other words, in this technique, the neck portion of the funnel is made to have a rectangular shape so that the size of the portion is smaller than in the related art, and as a result, deflection power is reduced while preventing collision of the electron beam.

However, when the deflection yoke related to the reduction of the deflection power is formed in the conventional structure in the cathode ray tube, that is, the deflection yoke in which the inner surface is formed in a circular shape from the neck portion side to the panel side is applied to the cathode ray tube. When mounted, it becomes difficult to substantially bring the deflection coil close to the electron beam trajectory, which makes it difficult to reduce the deflection power.

In other words, even if the shape of the funnel in which the deflection yoke is mounted is squared to reduce the deflection power in the cathode ray tube, if the deflection yoke, which has a great influence on the electron beam, is not shaped according to the appearance of the funnel, the deflection power of the cathode ray tube is substantially reduced. It will be impossible to realize.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a cathode ray tube having a deflection yoke provided to have a substantial effect on reducing the deflection power of a cathode ray tube.

In order to realize the above object,

A vacuum tube including a panel having a phosphor screen formed on an inner surface thereof, a cylindrical neck having an electron gun inserted therein, and a funnel-shaped funnel interposed between the panel and the neck; Horizontal and vertical deflection coils for deflecting the electron beam emitted from the electron gun and a deflection yoke including ferrite cores, wherein the ferrite cores are formed into a non-circular shape gradually from one end to the other, and the tube axis When the linear distance from the inner surface of the ferrite core to any one point L, and the thickness of the ferrite core to the point T is proposed, a cathode ray tube formed by a constant ratio of L and T is proposed.

In addition, the present invention to realize the above object,

A vacuum tube including a panel having a phosphor screen formed on an inner surface thereof, a cylindrical neck having an electron gun inserted therein, and a funnel-shaped funnel interposed between the panel and the neck; Horizontal and vertical deflection coils for deflecting the electron beam emitted from the electron gun and a deflection yoke including ferrite cores, wherein the ferrite cores are formed into a non-circular shape gradually from one end to the other, and the tube axis When the linear distance from the inner surface of the ferrite core to any one point L, and the thickness of the ferrite core to the point T is the first axis parallel to the longitudinal direction of the panel and the second axis perpendicular to the first axis Of the ratio T / L of L and T formed along the angle formed between the first axis and the second axis as a reference, the maximum value Max T / L and the minimum value Min T / L We propose a cathode ray whose ratio (Max T / L) / (Min T / L) satisfies the condition of (Max T / L) / (Min T / L) ≤ 1.1.

1 is a half sectional view showing a cathode ray tube according to an embodiment of the present invention,

2 is a cross-sectional view showing a cone portion according to an embodiment of the present invention,

3 is a perspective view illustrating a deflection yoke according to an embodiment of the present invention;

4 is an exploded perspective view illustrating the separation of the deflection yoke according to the embodiment of the present invention;

5 is a perspective view illustrating a ferrite core of a deflection yoke according to an embodiment of the present invention;

6 is a partial cross-sectional view illustrating the ferrite core of the deflection yoke according to the embodiment of the present invention;

7 is a graph showing the rate of change of the thickness of the ferrite cores according to an embodiment of the present invention,

8 is a graph showing a rate of change between the thickness and distance of ferrite cores according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a half cross-sectional view of a cathode ray tube according to an embodiment of the present invention, which includes a panel 11 formed in a substantially rectangular shape and a funnel-shaped funnel connected to the panel 11. 13) and a vacuum tube including a cylindrical neck 15 connected to the funnel 13 to form an outer shape.

The phosphor screen 17 is formed on the inner surface of the panel 11, and the deflection yoke 19 is mounted on the outer side near the boundary between the funnel 13 and the neck 15, and the inner side of the neck 15. The electron gun 21 is inserted and installed.

In such a cathode ray tube, the funnel 13 has the following configuration, which includes a cone portion 13b including a neck seal portion 13a connected to the neck 15, and the cone portion ( A body 13c which is rapidly expanded from the panel side end portion of 13b) and connected to the panel 11 side is included.

Here, the cone portion 13b is formed in a circular shape having the same diameter as the neck 15 on the neck 15 side, but gradually follows from the neck 15 side to the panel 11 side in FIG. 2. As shown in the figure, the panel 11 is formed in a non-circular shape such as a rectangular shape having a maximum diameter in directions other than the major axis X and minor axis Y directions.

In general, the deflection yoke 19 has a horizontal deflection coil inside and outside of the separator 19a made of a synthetic resin, as shown in FIG. 19b) and the vertical deflection coil 19c are attached.

Here, as shown in FIG. 4, the separator 19a is formed of a single body having a shape of a trumpet body by being mutually coupled to each other, and the separator 19a is formed of one body and then introduced into one side end portion 190a. To the other end is usually formed opening 192a.

In addition, the separator 19a basically has a structure as described above, and in order to reduce the deflection power of the cathode ray tube, the shape of the portion where the deflection coils 19b and 19c are mounted is generally formed in the introduction opening 190a. 192a) toward the side to gradually form a non-circular like a rectangle.

The shape of the separator 19a helps the deflection power to be reduced by bringing the horizontal deflection coil 19b and the vertical deflection coil 19c closer to the electron beam path.

The pair of horizontal deflection coils 19b mounted inward of the separator 19a in this embodiment is of a saddle type in this embodiment, and also a vertical deflection coil 19c mounted outward of the separator 19a. ) Is also saddle shaped.

Therefore, the vertical deflection coil 19c is not wound directly on the ferrite core 19d mounted to the outside of the separator 19a. At this time, the deflection coils 19b and 19c are also According to the shape of the separator 19a, the overall shape is gradually changed from a circular shape to a non-circular shape such as a rectangle as it goes from the introduction mouth portion 190a of the separator 19a to the opening portion 192a.

In addition, the ferrite core 19d also corresponds to the shape of the separate 19a and both deflection coils 19b and 19c, as shown in FIG. Towards the side, it gradually changes from a circle to a non-circle like a rectangle.

The ferrite core 19d having such a shape is formed while satisfying the following conditions in order to more effectively reduce the deflection power when the cathode ray tube is acting.

The condition is related to the thickness of the ferrite core (19d), more specifically, the ferrite core (19d) is a straight line distance from the tube axis (Z) of the cathode ray tube to any point on the inside ( L) and its corresponding thickness T and ratio T / L are defined by a first axis H parallel to the longitudinal direction of the panel 11 and a second perpendicular to the first axis H. It is formed to be made uniform according to the angle formed between the axes (V).

FIG. 6 is a reference figure for this, which shows a cross section of the ferrite core 19d perpendicular to the tube axis Z of the cathode ray tube and shows only a quarter quadrant of the ferrite 19d for convenience of description. .

Conventional ferrite cores have a shape such that the cross section is circular, the thickness (T) is made uniform according to the above angle, in the present invention, as described above, the ferrite core (19d) is The thickness T is non-uniformly formed according to the above angle because it is squared to reduce deflection power.

Specific data for this is as described in Table 1 below. For reference, the data described in Table 1 corresponds to the quarter quadrant of the ferrite core 19d shown in FIG. 6.

Angle (α) ° Distance (L) mm Thickness (T) mm Ratio (T / L) 0.00 34.190 7.870 0.230 10.00 34.390 7.920 0.230 20.00 35.000 8.070 0.231 30.00 36.030 8.320 0.231 36.87 36.460 8.450 0.232 40.00 36.370 8.420 0.232 50.00 34.900 7.980 0.229 60.00 32.450 7.470 0.230 70.00 30.790 7.150 0.232 80.00 29.830 6.960 0.233 90.00 29.530 6.900 0.234

In the table, an angle of 0 ° represents a case lying on the first axis (H), and an angle of 90 ° represents an angle between the first axis (H) and the second axis (V).

7 is a graph illustrating a state of change of the thickness T according to the angle state, and FIG. 8 is a graph of a state of change of the ratio T / L according to the angle state.

With reference to these data, the ferrite core 19d squares the overall shape, and furthermore, while the thickness T is different according to the angle change state, the distance L and the distance L are different from each other. It can be seen by keeping the ratio T / L of the thickness T constant. At this time, the ratio (T / L) is preferably larger than 0.225 and smaller than 0.25, more preferably maintained near 0.230.

In the present invention, setting the range of the ratio (T / L) as described above, when the ratio (T / L) is less than 0.025 or greater than 0.25, ferrite core lowers the magnetic field strengthening effect to properly play its role. Because you can not perform.

On the other hand, when the ferrite core 19d keeps the ratio T / L constant, the maximum value Max T / L and the minimum value Min T / L among the values of the ratio T / L. (Max T / L) / (Min T / L) is preferably maintained within the following range, this range setting is, if the ratio of the above maximum value and minimum value exceeds the following value, This is because the magnetic field reinforcement rate shows a large difference depending on the angle described above.

(Max T / L) / (Min T / L) ≤ 1.1

Substantially the maximum value T / L of the ratio T / L presented in this embodiment is 0.234 when the angle α is 90 °, and the minimum value T / L is 50 degrees. In the case where it is kept at °, it is 0.229, and the value of said ratio is made 1.02 at this time.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. In addition, it is natural that it belongs to the scope of the present invention.

As described above, the cathode ray tube according to the present invention reduces the deflection power by changing the shape of the configuration of the deflection yoke including ferrite core so that the deflection yoke for deflecting the electron beam is close to the actual trajectory of the electron beam to form a deflection magnetic field. Due to this can be effective in reducing the power consumption of the cathode ray tube.

Claims (3)

A panel having a phosphor screen formed on the inner surface thereof, A cylindrical neck in which an electron gun is inserted and installed inside, A vacuum tube comprising a funnel shaped funnel interposed between the panel and the neck; Horizontal and vertical deflection coils deflecting the electron beam emitted from the electron gun, and a deflection yoke including ferrite cores, When the ferrite core is gradually formed into a non-circular shape from one end to the other end, when the linear distance from the tube axis to any point on the inner surface of the ferrite core is L, the thickness of the ferrite core with respect to the point is T. , Cathode ray tube formed of a constant ratio of L and T. The method of claim 1, Cathode ray tube made of a ratio of T to L (T / L) satisfy the following equation. 0.225 <T / L <0.25 A panel having a phosphor screen formed on the inner surface thereof, A cylindrical neck in which an electron gun is inserted and installed inside, A vacuum tube comprising a funnel shaped funnel interposed between the panel and the neck; Horizontal and vertical deflection coils deflecting the electron beam emitted from the electron gun, and a deflection yoke including ferrite cores, When the ferrite core is gradually formed into a non-circular shape from one end to the other end, when the linear distance from the tube axis to any point on the inner surface of the ferrite core is L, the thickness of the ferrite core with respect to the point is T. A ratio of L and T formed along an angle formed between the first axis and the second axis with respect to the first axis parallel to the longitudinal direction of the panel and the second axis perpendicular to the first axis ( T / L), wherein a ratio (Max T / L) / (Min T / L) of the maximum value (Max T / L) and the minimum value (Min T / L) satisfies the following expression. (Max T / L) / (Min T / L) ≤ 1.1