KR100228161B1 - Electron gun for color cathode ray tube - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electrode structure of an electron gun for a color receiver tube that improves a part of the electrode structure for reducing convergence drift of an inline electron gun.

The present invention selectively or collectively burrs the pipe-shaped inner protrusions 21 and the outer protrusions 22 around the through hole H in the convergence cup 20 of the collar water tube electron gun, respectively. By forming a protrusion having a predetermined shape by molding, it is possible to reduce productivity and improve productivity while preventing deterioration of focus characteristics due to misconvergence.

Description

Kalashnikov gun

1 is an illustration showing the basic configuration of a color gun electron gun.

2 is a plan view showing a convergence cup in the X direction of FIG.

3 (a) and 3 (b) are front and longitudinal cross-sectional views of the convergence cup according to the present invention, respectively.

* Explanation of symbols for main parts of the drawings

10: cathode 11: the first grid

12: second grid 13: third grid

14: 4th grid 15: 5th grid

16: Sixth Grid 20: Convergence Cup

21: internal protrusion 22: external protrusion

H: through hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color water tube electron gun, and more particularly, to a color water tube electron gun that improves a part of an electrode structure to reduce convergence drift and improve productivity of an inline type electron gun.

In general, the color receiving tube (cathode ray tube) is a bulb type in which a fluorescent film is applied to the front screen and an electron gun is accommodated in the rear neck portion. R, G, and B electron beams emitted from the electron gun of the neck portion are spaced apart from the screen. And impinges on the fluorescent film through the micro holes of the shadow mask to be mounted to form pixels.

With reference to FIG. 1, a commonly used color water tube electron gun includes a cathode assembly for emitting hot electrons from the cathode 10 and a three-pole portion composed of a first grid 11 and a second grid 12; And a third grid 13 for concentrating hot electrons emitted from the triode to a predetermined electron beam. 4th grid (14) 5th Grid (15) It includes a main lens unit composed of the sixth grid 16, and includes a stem glass assembly (not shown) for supplying current and voltage to various grid assemblies including the cathode assembly. The convergence cup 20 is installed at the forefront of the series of grids.

The electron gun for the color water tube by this structure receives electric current from the outside, and the heater 16 in the cathode 10 is heated and emits hot electrons. At this time, the emitted hot electrons are controlled to a certain amount by the first grid 11, the hot electrons passing through the first grid 11 is focused and accelerated by the second grid 12 and the third grid 13, The accelerated hot electrons have a predetermined height by the third grid 13, the fourth grid 14, and the fifth grid 15, which serve as pre-focus functions. The electron beam having the light is focused at an appropriate magnification by an equipotential lens generated in the gap of the fifth grid 15 and the sixth grid 16 serving as the main lens. Thereafter, the electron beam is accelerated again by the sixth grid 16 and radiated into the through hole H of the convergence cup 20 to form a predetermined pixel on the fluorescent surface of the cathode ray tube.

As described above, the cathode ray tube electron gun focuses and accelerates the hot electrons emitted from the cathode 10 to the electron beam to perform a function of emitting a fluorescent surface. The inline electron gun in which the R, G, and B electron beams are arranged in a horizontal line has a simple structure. It is easy to manufacture, but has a weak point in astigmatism of a focus lens that functions to focus an electron beam.

On the other hand, a deflection yoke (not shown) mounted outside the neck of the collar tube forms a self-converging magnetic field and automatically concentrates the R, G, and B electron beams across the screen, in which the pincushion is a horizontal deflection field. The self-converging magnetic field, which consists of a magnetic field and a barrel magnetic field, which is a vertical deflection field, forms a two-pole, four-component magnetic field, so that the electron beam is horizontally squeezed by the horizontal diverging force and the vertical focusing force. ) do.

As the size of pixels formed on the screen increases due to the effect of spherical aberration due to the electron beam focusing on the focus lens and the electron beam lateralization due to the horizontal divergence and vertical focusing forces during the operation of the electron gun, This is deteriorated. As the lens magnification increases with the increase in the size of the color receiving tube or the increase in voltage, the spherical aberration becomes more severe and deteriorates the focus characteristic such as over-focusing.

In order to improve such deterioration of characteristics, various means are installed between the grids 11 to 16, for example, in order to reduce spherical aberration, increasing the distance between the opposing electrodes to large diameter the focus lens and the excess of electrons. To alleviate the connection, and to compensate for resolution degradation, divide the focus electrode into two parts, install a 4-pole lens (not shown) in the middle, and apply the appropriate focusing constant voltage and focusing dynamic voltage to the distance between the screen center and the peripheral part. Alternatively, the distortion of the electron beam due to the nonuniform deflection magnetic field in the peripheral portion is alleviated. Each of the grids 11-16 that make up the electron gun controls the hot electrons. Acceleration When sufficient compensation is made while performing functions such as focusing, accelerating again, and the like, the R, G, and B electron beams emitted from the convergence cup 20 maintain proper convergence and the above degradation is prevented.

Referring to FIG. 2, the shunt around the through hole H through which the R, G, and B electron beams pass through the convergence cup 20. Enhancer An enhancer 20a is provided to prevent deterioration of convergence between R, G, and B electron beams occurring at the periphery of the screen by an external high frequency magnetic field.

However, the shunt above Enhancer Conventional means including the enhancer (20a) require sub-assembly work such as manufacturing a separate microplate and joining them by welding or the like, so that the number of manufacturing operations is relatively high, thereby improving the productivity of the color receiving tube gun. It is becoming one of the factors that there is.

Accordingly, an object of the present invention is to provide a color water tube electron gun that can improve productivity by reducing the number of manufacturing work while performing the function of improving the deterioration of properties in line with other components in the inline type electron gun mainly used for color water tube. For sake.

In order to achieve the above object, the present invention is characterized in that any one of the minute pipe-shaped inner protrusions 21 and the outer protrusions 22 is formed around the through hole H of the convergence cup 20, respectively. Provides an award-winning electron gun.

At this time, the ones on both sides of the outer protrusion 22 are cut inclined at a predetermined angle toward the center thereof.

Hereinafter, with reference to the accompanying Figure 3 will be described in detail a preferred embodiment of the present invention. 3 shows a convergence cup according to the present invention, wherein (a) and (b) are front and longitudinal cross-sectional views, respectively.

In FIG. 3 (a), the convergence cup 20 provided adjacent to the front of the grid constituting the main lens unit has a cylindrical shape having a bottom surface, and three bottom through which R, G, and B electron beams pass. The through hole H is formed. A small pipe-shaped inner projection 21 around each through hole H is provided toward the rear main lens portion.

In FIG. 3 (b), a small pipe-shaped outer protrusion 22 around the through hole H of the convergence cup 20 is provided toward the front side (opposite direction of the main lens portion). The ones on both sides of the outer protrusions 22 have a predetermined angle toward the center thereof. It is obliquely cut in order to maintain the convergence of the R and B electron beams, which are susceptible to external high frequency magnetic fields, to prevent major deterioration of the screen.

At this time, the inner protrusion 21 and the outer protrusion 22 may be selectively or collectively installed in consideration of the influence of the external high frequency magnetic field according to the size of the color receiving tube, such as drawing (drawing) Rather than forming by separate processing, it is formed by burring when processing through hole (H), and has a predetermined height (h) and angle ( Grinding with) is desirable in terms of manufacturing man-hours.

As described through the above embodiments, the present invention forms a protrusion having a predetermined shape formed by burring processing inside the convergence cup 20 of the color water tube electron gun, thereby reducing convergence drift to deteriorate focus characteristics and the like. It is effective in reducing productivity while preventing productivity.

Although the present invention has been described above through its embodiments, the present invention is not limited thereto, and various modifications and applications may be made by those skilled in the art from the above-described embodiments and the appended claims.

Claims (2)

R G In the electron gun consisting of a convergence cup 20 and a plurality of grids thereof having a bottom surface and an opening in front of the through hole H through which the B electron beam passes: Around the through hole H of the convergence cup 20 An electron gun for a color water tube, characterized in that any one of a minute pipe-shaped inner projection 21 and an outer projection 22 is formed. The electron gun for a color receiver tube according to claim 1, wherein the ones on both sides of the outer protrusions (22) are inclined at a predetermined angle toward the center thereof.