KR19980011187U - Large Diameter Multistage Main Lens - Google Patents

Abstract

The present invention relates to a large diameter multistage main lens that improves a part of the electrode structure of an inline electron gun.

The present invention is composed of a plurality of grids (G1 to G6) in the electron gun focusing and accelerating the R, G, B electron beam with the fifth grid (G5) and the sixth grid (G6) as the main lens; The first electrode body 21 and the second electrode body 22 having a large diameter are provided between the fifth grid G5 and the sixth grid G6, and the first electrode body 21 and the second electrode are provided. The sieve 22 provides a large diameter multi-stage main lens, which is electrically connected to the sixth grid G6 to correct focusing of the electron beam.

Accordingly, the present invention, by installing a predetermined focusing correction electrode in the middle of the main lens in the color receiving tube having an inline electron gun, effectively reducing the characteristics of the cathode ray tube due to spherical aberration by effectively large diameter of the main lens. It works.

Description

Large Diameter Multistage Main Lens

The present invention relates to an electron gun for a color receiver, and more particularly, to a large diameter multistage main lens that improves a part of an electrode structure to correct structural defects 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, and the 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.

Referring to FIG. 1, a commonly used color water tube electron gun is provided with a cathode 10 for dissipating hot electrons and a plurality of grids G1 to G6 sequentially arranged and integrally formed by the bead glass 12.

The grid includes a three-pole portion consisting of a first grid G1 and a second grid G2, and a third grid G3 and a fourth grid G4 to focus hot electrons emitted from the three-pole portion into a predetermined electron beam. ), A main lens unit composed of a fifth grid G5 and a sixth grid G6, and a convergence cup 11 is provided at the foremost of the series of grids.

When a heater (not shown) in the cathode 10 is supplied with a current from the outside and heated, it emits hot electrons. The emitted hot electrons are controlled in a certain amount by the first grid G1, and the hot electrons passing through the first grid G1 are focused and accelerated by the second grid G2 and the third grid G3, and accelerated. The hot electrons have a height of a predetermined angle by the third grid G3, the fourth grid G4, and the fifth grid G5, which serve as pre-focus functions. The electron beam having an angle of a predetermined height is focused at an appropriate magnification by an equipotential lens generated in a gap between the fifth grid G5 and the sixth grid G6 serving as a main lens. . Thereafter, the electron beam is accelerated again by the sixth grid G6 and radiated through the convergence cup 20 to form a predetermined pixel on the fluorescent surface of the cathode ray tube.

In this case, the inline electron gun in which the R, G, and B electron beams are arranged in a horizontal line is simpler in structure than the delta type, and is easy to manufacture, while spherical aberration occurs on a focus lens that focuses the electron beam. There is this.

In addition, the deflection yoke (not shown) mounted outside the neck of the color receiving tube forms a self-converging magnetic field and automatically concentrates the R, G, and B electron beams throughout the screen. Since the self-converging magnetic field consisting of the barrel magnetic field, which is a vertical deflection field, forms a two-pole, four-component magnetic field, astigmatism is caused by the horizontal diverging force and the vertical focusing force, and the electron beam is horizontally lateralized.

Due to the effect of spherical aberration due to the electron beam overfocusing on the focus lens and the astigmatism caused by the horizontal divergence and vertical focusing forces during the operation of the electron gun, the pixels formed on the screen are distorted, and the resolution characteristic of the screen is closer to the peripheral part of the screen Deteriorates.

In particular, when the lens magnification increases with the increase in the size or the high voltage of the color receiving tube, the spherical aberration becomes more severe such as over-focusing and the focus characteristic is deteriorated.

In order to improve such deterioration of characteristics, various means are installed between the grids G1 to G6, for example, to reduce the spherical aberration, to increase the distance between the opposing electrodes to enlarge the focus lens, The large diameter of the lens is difficult because the cathode ray tube neck portion has a limited size to alleviate excessive focusing.

Accordingly, the present invention provides a large-diameter multi-stage main lens in which the focus lens is effectively enlarged and the deterioration of cathode ray tube characteristics is improved by installing a predetermined focusing electrode in the middle of the main lens in the in-line electron gun mainly used for color receiving tubes. Its purpose is to.

1 is an exemplary view showing the basic configuration of a color gun electron gun;

2 is a structural diagram showing a main lens according to the present invention;

Explanation of symbols on main parts of drawing

10: cathode, 11: convergence cup, 12: bead glass, 21: first electrode body,

22: second electrode body, 23: first split resistor, 24: second split resistor, G1: first grid,

G2: second grid, G3: third grid, G4: fourth grid, G5: fifth grid,

G6: 6th grid, Vf: focus voltage.

In order to achieve the above object, the present invention is composed of a plurality of grids G1 to G6, and focuses and accelerates the R, G, and B electron beams using the fifth grid G5 and the sixth grid G6 as the main lenses. In the electron gun: a first electrode body 21 and a second electrode body 22 having a large diameter are provided between the fifth grid G5 and the sixth grid G6, and the first electrode body 21 is provided. And the second electrode body 22 is electrically connected to the sixth grid G6 to correct the focus of the electron beam, thereby providing a large-diameter multistage main lens.

In this case, the first electrode body 21 and the second electrode body 22 are interposed with a first split resistor 23, and the second electrode body 22 and the sixth grid G6 have a second split resistor. Connect all in series via (24).

Example

Hereinafter, with reference to the accompanying Figure 2 will be described in detail a preferred embodiment of the present invention. 2 is a structural diagram showing a main lens according to the present invention.

The present invention is composed of a plurality of grids (G1 to G6), and is applied to an inline electron gun that focuses and accelerates an R, G, B electron beam using the fifth grid (G5) and the sixth grid (G6) as main lenses. .

The present invention provides a first electrode body 21 and a second electrode body 22 having a large diameter between the fifth grid G5 and the sixth grid G6. The electrode bodies 21 and 22 have the same size and are installed at the same intervals, but form a large diameter (not shown) for converging R, G, and B electron beams, and have a vertical shape having a large diameter up and down. This alleviates the shortcomings of astigmatism.

In this case, the first electrode body 21 and the second electrode body 22 are electrically connected to the sixth grid G6 to form a correction lens.

The first electrode body 21 and the second electrode body 22 are interposed with a first split resistor 23, and the second electrode body 22 and the sixth grid G6 have a second split resistor 24. Connect all of them in series via).

Accordingly, since the differential voltage is applied by the split resistors 23 and 24 to form a gentle voltage gradient, the first electrode body 21 and the second electrode body 22 increase the size of the main lens unit. The effect of spherical aberration can be reduced.

In the electron gun of this configuration, when the grids G1 to G6 are sufficiently compensated while performing functions such as controlling, accelerating, concentrating, and accelerating hot electrons, they are radiated from the convergence cup 11 (Fig. 1). The R, G, B electron beam maintains proper convergence and the above-mentioned deterioration phenomenon is prevented.

As described through the above embodiments, the large-diameter multi-stage main lens of the present invention is provided with a predetermined focusing correction electrode in the middle of the main lens in a color receiving tube having an inline-type electron gun, thereby effectively spherically sizing the main lens. There is an effect of improving the deterioration of characteristics of the cathode ray tube due to aberration.

Although the present invention has been described through the embodiments, the present invention is not limited thereto, and various modifications and applications are possible to those skilled in the art from the above-described embodiment and the appended claims of utility model registration.

Claims (2)

In an electron gun composed of a plurality of grids (G1 to G6) and focusing and accelerating an R, G, B electron beam using the fifth grid (G5) and the sixth grid (G6) as main lenses: The first electrode body 21 and the second electrode body 22 having a large diameter are provided between the fifth grid G5 and the sixth grid G6, and the first electrode body 21 and the second electrode are provided. The sieve 22 is electrically connected to a sixth grid G6 to correct focusing of an electron beam. The method of claim 1, wherein the first electrode body 21 and the second electrode body 22 are interposed through a first split resistor 23, and the second electrode body 22 and the sixth grid G6 A large-diameter multistage main lens, characterized in that all of them are connected in series via a second split resistor (24).