KR200203873Y1 - Electron gun for cathode ray tube - Google Patents

Abstract

An electron gun that emits an electron beam from a cathode ray tube that can be used as a color television or a computer monitor. When an electron beam that is injected into the diagonal periphery of the screen passes through the hole of the shield cup, the electron beam does not pass through the hole properly. In order to prevent loss, the shape of the hole portion of the shield cup is configured to have a maximum diameter in a direction other than the horizontal axis and the vertical axis. The electron gun for the cathode ray tube, in particular, even when the cathode ray tube shortens the electric field by increasing the deflection angle, the electron beam can be satisfactorily landed on the diagonal periphery of the screen, thereby achieving a good image.

Description

Electron gun for cathode ray tube

The present invention relates to an electron gun of a cathode ray tube, and more particularly, to an electron gun suitable for a cathode ray tube having a shortened electric field.

Cathode ray tubes, as is well known, realize images by deflecting the electron beam emitted from the electron gun in the horizontal and vertical directions with respect to the screen so that the electron beam lands on the phosphor of the screen.

In order to reduce the size of the cathode ray tube, that is, shorten the electric field and provide it to the consumer, the wide angle deflection of the electron beam must be made, as is well known. The increase in leakage magnetic field and power consumption due to the increase of version and deflection power remains a challenge.

Conventional techniques proposed to solve this problem include square color tubes disclosed in US Pat. No. 3,731,129. That is, in this technique, the funnel to which the deflection yoke is mounted is configured such that the wide periphery and the cross section of the deflection yoke are installed to include a deflection portion that gradually changes from a square shape to a circular shape from the panel side toward the neck portion, so that the deflection yoke is horizontal and vertical. By reducing the deflection power by allowing the coil to approach the pass-through region of the electron beam formed inside the funnel, and simultaneously preventing the electron beam from being emitted to the inner surface of the funnel, it is possible to achieve a good image in the diagonal direction of the screen effective screen. .

On the other hand, when the electron beam emitted from the electron gun passes through the shield cup 10 attached to the final electrode of the electron gun shown in FIG. 8, the electron beam must pass through the hole 10b without hitting the bottom surface 10a of the electron gun. It is well known that it is possible to implement.

However, in view of this fact, in the technique disclosed in the above-mentioned US Patent 3,731,129, since the shield cup configuration of the electron gun is generally referred to, in other words, the shape of the hole part of the shield cup is formed in a simple circle, even in the shape of a funnel Although it is provided to solve the problems caused by the wide-angle deflection of the electron beam, in practice, there is a high probability that the electron beam hits the bottom surface of the above-described shield cup when it is emitted from the electron gun. There is a difficult problem.

That is, when the electron beam is wide-angle deflection in the cathode ray tube shortened in the electric field, when the deflection in the diagonal direction of the effective screen of the screen, the deflection electron beam has a sufficient margin of passage when passing through the hole of the shield cup. Do.

However, in the wide-angle deflection tube, the electron beam tends to be deflected substantially with a pincushion type of movement trajectory. When such an electron beam passes through a conventional circular shield cup hole, the electron beam does not pass properly, but is disposed on the bottom surface. It will be more likely to hit.

Therefore, the present invention has been devised in view of the above problems, and an object of the present invention is that the electron beam emitted from the cathode ray tube shortened in the electric field can pass through its hole well without hitting the shield cup of the electron gun. To provide an electron gun for a cathode ray tube.

In addition, another object of the present invention is to provide a cathode ray tube which allows the electron beam emitted from the electron gun to pass through it well without being caught in the shield cup of the electron gun.

In order to realize the above object,

A plurality of cathodes having an electron beam emitting material;

A plurality of grid electrodes arranged on one side of the cathode and having a plurality of electron beam through holes corresponding to the cathode;

Among the grid electrodes, a shield cup is provided which is connected to the final grid electrode and has a plurality of electron beam through holes corresponding to the cathode, and the holes have a shape having a maximum diameter in a direction other than the horizontal axis and the vertical axis. An electron gun for cathode ray tubes is proposed.

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

A panel having a phosphor screen formed on an inner surface thereof;

A funnel connected to the panel and having a deflection yoke installed on an outer circumference thereof;

And a neck portion connected to the funnel and having an electron gun inserted therein, wherein the funnel has an outer shape of the panel in a circular shape gradually from the neck portion side to the panel side of the funnel at the portion where the deflection yoke is installed. Formed into a non-circle having a maximum diameter in a direction other than a short axis,

The electron gun comprises: a plurality of cathodes having an electron beam emitting material;

A plurality of grid electrodes arranged on one side of the cathode and having a plurality of electron beam through holes corresponding to the cathode;

Among the grid electrodes, a shield cup is provided which is connected to the final grid electrode and has a plurality of electron beam through holes corresponding to the cathode, and the holes have a shape having a maximum diameter in a direction other than the horizontal axis and the vertical axis. A cathode ray tube is proposed.

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

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

3 is a cross-sectional view showing a panel side cross-sectional shape of the cone portion according to an embodiment of the present invention,

4 is a perspective view showing an electron gun according to an embodiment of the present invention,

5 is a front view showing a shield cup of an electron gun according to an embodiment of the present invention,

6 and 7 are schematic views for explaining the electron beam through hole formed in the shield cup of the electron gun according to the embodiment of the present invention,

FIG. 8 is a front view showing a shield cup of a typical cathode ray tube electron gun. FIG.

Hereinafter, with reference to the accompanying drawings, preferred embodiments for clarifying the present invention will be described in detail.

1 is a cutaway perspective view showing a cathode ray tube according to an embodiment of the present invention.

The illustrated cathode ray tube is provided for a color television, which is formed in a substantially rectangular shape and has a panel 3 having a phosphor screen 1 formed therein and a deflection in its outer peripheral portion while being connected to the panel 3. It is formed of a vacuum body including a funnel-shaped funnel 7 to which the yoke 5 is mounted, and a neck portion 11 which is connected to the rear of the funnel 7 and has an electron gun 9 inserted therein. .

As is well known, such a cathode ray tube uses three (R, G, B) electron beams emitted from the electron gun 9 to the deflection yoke 5 for the long axis (or horizontal axis H) and the short axis ( Or it is deflected in the direction of the vertical axis V to pass through the electron beam through hole 13a of the shadow mask 13 installed inside the panel 3 to be landed on the screen 1, thereby realizing a predetermined image. do.

In order to effectively reduce the deflection power while performing the above-described action, the cathode ray tube is formed by quadranging the portion where the deflection yoke 5 is mounted to be close to the substantially moving trajectory of the electron beam in the portion of the funnel 7.

That is, the funnel 7 has a neck seal portion 70a which forms a connection portion with the neck portion 11 in the direction of the panel 3 from the neck portion 11 and the neck seal portion 70a. Cone part 70b which is adjacently arrange | positioned and the body 70c which are expanded rapidly from the panel side end part of this cone part 70b and connected to the said panel 3 side are formed, and this deflection yoke (substrate) is substantially performed at this time. The cone portion 70b to which 5) is mounted is formed in a circular shape having the same diameter as that of the neck portion 11 on the side of the neck portion 11, while the neck portion 11 is mounted. As shown in FIG. 3, the panel 3 has a maximum diameter in a direction other than the long axis H and the short axis V of the panel 3, and is formed in a non-circular shape such as a rectangle. do.

The cathode ray tube formed as described above has the deflection yoke as the deflection yoke of the deflection yoke 5 approaches the movement trajectory of the electron beam passing through the inside of the cone portion 70b due to the shape of the cone portion 70b. The deflection power of the electron beam by (5) can be reduced.

On the other hand, the electron gun 9 mounted inside the neck portion 11 of the cathode ray tube includes a plurality of cathodes 9a corresponding to three R, G, and B, as shown in FIG. A plurality of grid electrodes 9b, 9c, 9d, 9e having electron beam passage holes corresponding to the respective cathodes 9a, and a shield cup 9f attached to the final electrode 9e, among the grid electrodes. It has a conventional structure.

The cathode 9a has a hot electron emission material, and the plurality of grid electrodes 9b, 9c, 9d, and 9e pass through respective electron beams from the first grid electrode 9b to the fourth grid electrode 9e. The hole is fixed to the bead glass 9g serving as the support while being arranged to one side of the cathode 9a in accordance with the cathode 9a.

In addition, the shield cup 9f is formed in a cylindrical cup shape as usual, and as shown in FIG. 5, an electron beam through hole portion corresponding to the three cathodes 9a on its bottom surface 90f ( 92f).

Here, the holes 92f are arranged in a line at predetermined intervals as the electron gun 9 is provided with an inline electron gun, and the shape thereof is in a direction other than the horizontal axis H and the vertical axis V. It consists of a non-circular shape with a maximum diameter, for example, a rectangle.

That is, the hole portion 92f is formed to have a longer length in the diagonal direction than in the directions of the horizontal axis H and the vertical axis V, which causes the cathode ray tube to have a large deflection angle to shorten its length. When the deflection yoke 5 is mounted along with the cone portion 70b to the neck portion 11 where the shield cup 9f is located, an electron beam emitted from the electron gun 9 is thereby caused. It is considered to be further deflected toward the diagonal direction side of the screen 1 from passing through the shield cup 9f.

The hole 92f is preferably formed by satisfying the following conditions while taking the shape of the above structure, which is referred to as the radius of the maximum diameter L as shown in Figure 6, the maximum radius (L) ) And the difference between the radius in the horizontal axis (H) direction ΔH and the difference between the maximum radius (L) and the radius in the vertical axis (V) direction ΔV, the hole (92f) is To satisfy.

When the electron beam passage hole 92f is formed in this manner, as shown in FIG. 7, the hole 92f is conventionally in the horizontal axis H or vertical axis V direction of the hole 92f. Compared to the circular hole portion 20 having a radius with respect to the radius, the space portion is further secured to the diagonal portion side, and the passage margin of the electron beam substantially deflected in the diagonal direction can be sufficiently obtained.

In addition, the electron beam passage hole portion 92f is an unnecessary space compared to the horizontal axis H and the vertical axis V, as compared with the circular hole portion 30 formed with the maximum radius L as the radius. Not to occupy the bottom surface 90f of the sealed cup 9f, which helps to have a stable structure when the sealed cup 9f is made to a certain size.

Thus, the cathode ray tube having the electron gun 9 formed as described above, in the process of reducing the deflection power due to the shape of the cone portion 70b as described above, furthermore, the electron beam of the shield cup 9f. By deforming the through-holes 92f so that the wide-angle deflected electron beams can easily pass, the electron beams deflected even at the diagonal portions of the screen do not hit the shield cup 9f and land well.

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 utility model registration claims and the detailed description of the invention and the scope of the accompanying drawings. Of course, this also belongs to the scope of the present invention.

As described above, the electron gun according to the present invention and the cathode ray tube having the same allow the electron beam that may be lost in the shield cup of the electron gun to be completely landed on the screen when the electron beam is deflected by the deflection yoke, so that the image of the periphery of the screen is also good. It will have an effect that can be implemented.

Claims (3)

A plurality of cathodes having an electron beam emitting material; A plurality of grid electrodes arranged on one side of the cathode and having a plurality of electron beam through holes corresponding to the cathode; Among the grid electrodes, a shield cup is provided which is connected to the final grid electrode and has a plurality of electron beam through holes corresponding to the cathode, and the holes have a shape having a maximum diameter in a direction other than the horizontal axis and the vertical axis. Electron gun for cathode ray tube. The shape of the electron beam through hole of the shield cup is defined as L, and the difference between L and the radius in the horizontal axis direction is ΔH, and L and the radius in the vertical axis direction. An electron gun for a cathode ray tube, characterized in that when the difference is ΔV, the following equation is satisfied. A panel having a phosphor screen formed on an inner surface thereof; A funnel connected to the panel and having a deflection yoke installed on an outer circumference thereof; And a neck portion connected to the funnel and having an electron gun inserted therein. Formed into a non-circle having a maximum diameter in a direction other than a short axis, The electron gun comprises: a plurality of cathodes having an electron beam emitting material; A plurality of grid electrodes arranged on one side of the cathode and having a plurality of electron beam through holes corresponding to the cathode; Among the grid electrodes, a shield cup is provided which is connected to the final grid electrode and has a plurality of electron beam through holes corresponding to the cathode, and the holes have a shape having a maximum diameter in a direction other than the horizontal axis and the vertical axis. Cathode ray tube.