KR100778395B1 - Cathode ray tube - Google Patents

Abstract

A panel including a screen including R, G, and B phosphors formed therein to compensate for an unbalanced HCR miss convergence phenomenon occurring at a periphery of the screen to improve image quality characteristics thereof; A hollow coil support connected to the panel and having openings at both ends thereof; Horizontal and vertical coils installed inside and outside the coil support to form a magnetic field for deflecting the electron beam; A funnel in which a deflection unit including a core installed on an outer circumference of the coil support is installed on an outer circumference; And a plurality of cathodes connected to the funnel and having an electron emission material; A plurality of electrodes forming a beam of electrons emitted from the cathode; A shield cup connected to an electrode to which a high voltage supplied from the outside of the funnel is applied; A neck controller installed in the shield cup, the neck support including a field controller for adjusting the convergence of the electron beam, and having an electron gun mounted therein for scanning a plurality of electron beams in-line toward the fluorescent screen; A paramagnetic material that is formed of a pair of insulators formed by extending a plate around one side of the opening to enable separate coupling, and installed on the plate around the opening to compensate for the convergence of the electron beam disposed in the center of the electron beam. It includes a correction sphere.

Cathode Ray Tube, Deflection Unit, Paramagnetic, HCR, Miss Convergence, Electron Beam

Description

Cathode Ray Tube {CATHODE RAY TUBE}

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

2 is a front view showing a deflection unit according to an embodiment of the present invention,

3 is a rear view showing a deflection unit according to an embodiment of the present invention,

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

5 is a schematic diagram for explaining the operation of the electron beam convergence correction tool according to an embodiment of the present invention,

6 and 7 are diagrams for explaining the misconvergence state of the electron beam generated in the conventional cathode ray tube.

The present invention relates to a cathode ray tube, and more particularly to an in-line array of electron beams scanned onto a screen for image realization, and to fielding the electron gun to correct fine convergence for the electron beam. It relates to a cathode ray tube having a field controller.

As is well known, when implementing a color image by arranging R, G, and B electron beams in a cathode ray tube, the curvature of the shadow mask employed for color implementation and the electron beam converge to the hole of the shadow mask. Due to the difference in convergence curvature, a so-called peripheral miss convergence phenomenon occurs, and in order to solve this problem, a deflection unit employed for deflection of the electron beam is conventionally implemented in a self-convergence method. .

The self-convergence deflection unit is configured to have a pin-cushion type magnetic field for deflecting the electron beam in a horizontal direction, and a magnetic field for deflecting the electron beam in a vertical direction in a barrel shape. The non-uniform magnetic field thus formed increases the focusing distance of the electron beam scanned toward the periphery of the screen, thereby reducing the peripheral miss convergence phenomenon.

However, in the conventional cathode ray tube, although the peripheral miss convergence phenomenon is greatly reduced by the self-convergence deflection unit, the magnetic flux density of the deflection unit of the deflection unit on the R, G, B electron beams is reduced. In the portion, the magnetic flux density is relatively smaller than that of the R and B electron beams, which are side beams, compared to the G electron beams disposed between the R and B electron beams, so that when the electron beams are deflected in the horizontal direction by the deflection unit, the G electron beam Small deflection compared to R and B electron beams results in so-called HCR (Horizontal Center Raster (hereinafter referred to as HCR for convenience)) misconvergence.

The HCR miss convergence means that the R and B electron beams are further deflected outwardly than the G electron beams as shown in FIG. 6 by the influence of the magnetic flux density. To reduce miss convergence, a magnetic body called a field controller is mounted in the shield cup of the electron gun.

That is, the field controller is installed around the R, B electron beam through hole, which is a side beam of the R, G, B electron beams, and when a substantial cathode ray tube acts, a leakage magnetic field generated by the deflection unit passes into the R, G electron beam through hole. In other words, the R and B electron beams are deflected less than the G electron beams so that the R, G and B electron beams are centered on the screen.

However, in the conventional cathode ray tube having the field controller, there is a problem that the above-described HCR miss convergence is continuously generated due to the counter electromotive voltage formed in the shield cup.

That is, when the electron beam is deflected in the horizontal (left, right) direction of the screen by the horizontal magnetic field of the deflection unit, for example, when the raster is deflected once in the horizontal direction, the raster is drawn back to the first position, and the raster is drawn again. In the shield cup, a counter electromotive voltage is generated by electromagnetic induction.

When such counter electromotive voltage is formed in the shield cup, a repulsive force against the counter electromotive voltage is generated in the shield cup, which is usually formed in a circular cup shape, wherein the repulsive force is the greatest with respect to the G electron beam, which is the center beam, among the electron beams. Get up.

Accordingly, even when the G electron beam is compensated for the HCR miss convergence by the field controller, as shown in FIG. 7, since the repulsive force is greater than the compensation force by the field controller, as shown in FIG. The G electron beam is shifted further to the right than R and B and landed on the screen.

Accordingly, the conventional cathode ray tube of the field controller has a so-called unbalanced HCR miss convergence in which the G electron beams in the left and right side portions on the screen show a difference in the convergence state with the R and B electron beams. It is a situation that has a problem of deteriorating the image quality of the periphery of the screen.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an imbalance generated in a cathode ray tube employing a field controller in a shield cup of an electron gun in order to correct the convergence of a G electron beam. It is to provide cathode ray tube that can supply high quality image by preventing HCR miss convergence.

In order to realize the above object,

A panel having a screen including R, G, and B phosphors formed therein;

A hollow coil support connected to the panel and having openings at both ends thereof; Horizontal and vertical coils installed inside and outside the coil support to form a magnetic field for deflecting the electron beam; A funnel in which a deflection unit including a core installed on an outer circumference of the coil support is installed on an outer circumference; And

A plurality of cathodes connected to the funnel and having an electron emission material; A plurality of electrodes forming a beam of electrons emitted from the cathode; A shield cup connected to an electrode to which a high voltage supplied from the outside of the funnel is applied; A neck installed inside the shield cup, the neck controller including an electron gun for scanning a plurality of electron beams in-line toward the fluorescent screen, including a field controller for adjusting the convergence of the electron beams,

The coil support is formed of a pair of insulators formed by extending the plate around one side of the opening so as to be separated and coupled to each other, and the convergence of the electron beam disposed in the center of the electron beams is provided on the plate around the opening. Provided is a cathode ray tube including a correction sphere of a paramagnetic body to be corrected.

The correction tool includes a pair of horizontal magnetic pieces which are disposed to face each other with the electron beam disposed at the center and a vertical magnetic piece disposed between one end of the horizontal magnetic piece and connected to the horizontal magnetic piece.

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

1 is a side cross-sectional view showing a cathode ray tube according to an embodiment of the present invention. As shown, the cathode ray tube forms an outer appearance by a vacuum tube made of a glass body, which, as is well known, is a panel 20 which is a front glass, and which is connected to the panel 20 to form a trunk portion of the tube. It consists of a funnel 22 and a neck 24 leading to the rear of the funnel 22 and forming a tail portion.

In the panel 20, a screen 26 including R, G, and B phosphors is formed on the inner surface of the panel 20, and a deflection for deflecting the electron beam in the horizontal and vertical directions of the panel 20 on the outer circumference of the funnel 22. The unit 28 is mounted, and an electron gun 30 is installed inside the neck 24 for scanning the electron beam to be deflected by the deflection unit 28 to the screen 26.

In the above configuration, the deflection unit 28 is made of a cross arm type, and the electron gun 30 has an inline type electron gun configuration.

Looking at the configuration of the deflection unit 28 and the electron gun 30 in more detail, first, the deflection unit 28, as can be seen through Figs. A hollow coil support 28c having a hollow body 28b formed therein, and a horizontal coil 28d and a vertical coil (28d) which form magnetic fields for horizontal and vertical deflection of the electron beams on the inner and outer sides of the coil support 28c, respectively. 28e) is attached. Here, the vertical coil 28e is wound around a core 28f provided on the outer circumference of the coil support 28c, and the coil support 28c is formed of a magnetic material such as a silicon steel sheet on the portion of the opening 28a. A cross arm 28g is provided. In addition, the coil support 28c is composed of a pair of insulators capable of separate coupling, and the plate 28h is integrally formed around the introduction port 28b.

In addition, the electron gun 30 includes a cathode 30a having an electron emission material and provided in plurality in correspondence to R, G, and B electron beams, and a plurality of electrodes for forming a beam of electrons emitted from the cathode 30a. 30b and the shield cup 30c which are provided to be connected to the electrode to which the high voltage supplied from the outside of the cathode ray tube is applied among the plurality of electrodes 30b, as shown in FIG. Among the R, G and B electron beam through holes 300c, 302c and 304c, a field controller 30d which is a magnetic field control element having a substantially '-' shape is formed around the R and B electron beam through holes 300c and 304c which are side beams. Attached.

In this configuration, since the specific configuration and operation of the cross arm 28g and the field controller 30d are known techniques, detailed descriptions thereof will be omitted in the present embodiment.

On the other hand, the coil support 28c of the deflection unit 28 is provided with a means provided for correcting an unbalanced HCR miss convergence of an electron beam which has conventionally occurred in a cathode ray tube having the field controller 30d mounted on an electron gun. This means is provided on one side of the plate 28h that is around the introduction port 28b side of the coil support 28c. That is, the means is composed of a 'c' shaped correction sphere 32 provided with a paramagnetic body, when the deflection unit 28 is viewed from the neck 24 side to the panel 20 side, it is disposed on the right side It is installed on the plate 28h of the coil support. (See FIG. 3).

To this end, a plurality of fasteners 34 for fixing the correction tool 32 are integrally formed in the plate 28h.

The correction tool 32 is made of iron (Fe) as a main component of the material, and contains a small amount of silicon (Si), manganese (Mn), aluminum (Al), tin (Sn) and the like in addition to iron. In addition, as described above, the center electron beam of the R, G, B electron beams B _R , B _G , B _B arranged inline, that is, in the center of the introduction port 28b, as described above, is a G electron beam ( B _G ) a vertical magnetic piece 32 disposed between and connected to a pair of horizontal magnetic pieces 32a arranged up and down (based on the drawing) and having one side ends of the horizontal magnetic pieces 32a at the center thereof. It is shaped like a 'c', but it is not necessarily limited thereto. That is, if the shape which can exert a magnetic field on the G electron beam above and below the G electron beam B _G is sufficient.

In the present invention, the correction tool 32 is installed on the coil support 28c of the deflection unit 28 in the cathode ray tube according to the magnetic field distribution formed by the correction tool 32. This is to reduce the possibility of unbalanced HCR miss convergence.

The magnetic distribution of the corrector 32 is such that the HCR miss convergence is caused by the action of the field controller 30d by the electron beams B _R , B _G , and B _B in response to the action of the electron gun 30. Compensating for the unbalanced HCR miss convergence caused by the repulsive force caused by the counter electromotive force generated in the shield cup 30c when the electron beam B _G , which is the center beam, is emitted from the shield cup 30c while being compensated. Done.

That is, the G electron beam B _G is moved in consideration of an unbalanced HCR miss convergence amount caused when the screen 26 finally reaches the screen 26 by the magnetic field formed by the corrector 32. This is achieved by adjusting the position at which the correction sphere 32 is fixed on the coil support 28c (by moving the correction sphere to the left and right when referring to FIG. 3 as a reference).

In this way, if the movement path is corrected by the corrector 32 before the G electron beam B _G passes through the deflection unit 28 in earnest, the deflection unit 28 generates When it is deflected by the deflection magnetic field and scanned to the left and right side portions of the screen 26, it becomes possible to coincide with the side beams R and B electron beams B _R and B _B. In the cathode ray tube, the G electron beam ( B _G ) can reduce imbalance HCR miss convergence.

Table 1 below shows data of applying the correction tool 32 to the deflection unit 28 and measuring the degree of unbalanced HCR miss convergence of the electron beam in the present embodiment. It can be seen that the imbalance miss HCR miss convergence is reduced in the cathode ray tube of the present invention to which the corrector 32 is applied as compared with the case where the corrector is not conventionally applied.

The present invention Conventional No XH Left-HCR Right-HCR HCR-UNB No XH Left-HCR Right-HCR HCR-UNB One 0.82 -0.40 0.21 0.61 One 1.28 -0.47 0.51 0.98 2 0.76 -0.54 0.59 1.13 2 1.46 -0.48 0.72 1.19 3 0.57 -0.49 0.13 0.62 3 1.03 -0.71 0.59 1.3 4 0.99 -0.24 0.48 0.69 4 1.58 -0.44 0.72 1.16 5 0.35 -0.51 0.08 0.58 5 0.75 -0.60 0.38 0.97 6 0.50 -0.70 0.19 0.89 6 0.80 -0.75 0.90 1.05 7 0.37 -0.55 0.25 0.79 7 1.11 -0.62 0.32 0.94 Average 0.62 -0.49 0.29 0.77 Average 1.14 -0.58 0.51 1.08

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

As described above, the cathode ray tube according to the present invention includes a parabolic correction tool for reducing an unbalanced HCR miss convergence phenomenon of an electron beam in the deflection unit, thereby improving image quality around the screen and improving overall quality. Has an effect.

Claims (3)

A panel having a screen including R, G, and B phosphors formed therein; A hollow coil support connected to the panel and having openings at both ends thereof; Horizontal and vertical coils installed inside and outside the coil support to form a magnetic field for deflecting the electron beam; A funnel in which a deflection unit including a core installed on an outer circumference of the coil support is installed on an outer circumference; And A plurality of cathodes connected to the funnel and having an electron emission material; A plurality of electrodes forming a beam of electrons emitted from the cathode; A shield cup connected to an electrode to which a voltage supplied from the outside of the funnel is applied; A neck mounted inside the shield cup, including a field controller for adjusting the convergence of the electron beam, in which an electron gun for scanning a plurality of electron beams in-line toward the fluorescent screen is mounted therein. Including, The coil support is formed by a pair of insulators formed by extending the plate around one side of the opening so as to be separated and coupled to each other. Correction sphere of paramagnetic body to correct Cathode ray tube comprising a. The method of claim 1, A cathode ray comprising a pair of horizontal magnetic pieces arranged opposite to each other with the correction sphere positioned at the center of the electron beam, and a vertical magnetic piece disposed between one end of the horizontal magnetic piece and connected to the horizontal magnetic piece tube. The method of claim 1, A cathode ray tube, wherein the correction sphere is composed of iron as a main component.

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