KR200160129Y1 - Cathode ray tube - 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 grid (G1 ~ G6), the fifth gun (G5) and the sixth grid (G6) as a main lens for focusing and accelerating the R, G, B electron beam in the electron gun: the fifth Between the grid G5 and the 6th grid G6, the 1st electrode body 21 and the 2nd electrode body 22 which have a large diameter are provided, and the said 1st electrode body 21 and the 2nd electrode body 22 are provided. ) Provides a large diameter multi-stage main stage characterized in that it is electrically connected to the sixth grid (G6) to correct the 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.

In this way, the light is focused at an appropriate magnification by an equipotential lens created in the gap of the fifth grid G5 and the sixth grid G6 serving as a main lens of the electron beam having a predetermined height. . 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 type electron gun in which the R, G, and B electron beams are arranged side by side is simpler to manufacture than the delta type, but 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 due to 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 illustration showing the basic configuration of a color gun electron gun.

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

<Description of the symbols for the main parts of the drawings>

10: Cathode 11: Convergence Cup

12 Bead glass 21 First electrode body

22: second electrode body 23: first split resistance

24: second division 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 ~ G6), is applied to the inline electron gun that focuses and accelerates the R, G, B electron beam with the fifth grid (G5) and the sixth grid (G6) as the main lens .

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, the first and second electrode bodies 21 and 22 are applied with differential voltages by the division resistors 23 and 24 to form a gentle voltage gradient, thereby increasing 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 the thermoelectrics, 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 may be made by those skilled in the art from the above-described embodiments and the appended claims.

Claims (2)

An electron gun composed of a plurality of grids (G1 to G6) and focusing and accelerating an R, G, B electron beam using a fifth grid (G5) and a sixth grid (G6) as main lenses: the fifth grid ( Between the G5) and the 6th grid G6, the 1st electrode body 21 and the 2nd electrode body 22 which have a large diameter are provided, and the said 1st electrode body 21 and the 2nd electrode body 22 are A large diameter multi-stage main lens, characterized in that for correcting the focusing of the electron beam by being electrically connected to the sixth grid (G6). 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 are A large-diameter multistage main lens, characterized in that all of them are connected in series via a second split resistor (24).