KR200160135Y1 - Electron gun of cathode ray tube - Google Patents

Abstract

The present invention provides a static focus electron gun of the flange portion of the main lens G-beam through-hole cathode ray tube.

The static focus electron gun of the G-beam through-hole cathode ray tube of the flange portion of the main lens is composed of a plurality of grids, and focuses and accelerates the R, G, and B electron beams using the fifth and sixth grids as the main lenses. In the static focus electron gun, a pair of sidewall portions in which the G electron beam passing holes are horizontally and vertically symmetrical are formed, respectively, and has a sidewall effect to adjust the spot size of the G electron beam.

Accordingly, the center G electron beam can be adjusted with respect to the surrounding R and B electron beams in the spot size on the screen, and there is an effect of preventing deterioration of the resolution characteristic even in the enlargement and the light deflection angle.

Description

Static focus electron gun of G-beam through hole cathode ray tube of flange part of main lens

The present invention relates to a static focus electron gun of the G-beam through-hole cathode ray tube of the flange of the main lens. Specifically, the spot size of the G electron beam in the in-line static focus electron gun is defined as R, B. The present invention relates to a static focus electron gun of a G-beam through-hole cathode ray tube of the flange portion of the main lens which can be adjusted to the spot size of the electron beam.

In general, the color receiving tube is a bulb type in which a fluorescent film is applied to the front screen and a static focus electron gun is accommodated in the rear neck portion, and the R, G, and B electron beams emitted from the static focus electron gun of the neck portion are screened. The pixel is formed by colliding with the fluorescent film by passing through the microholes of the shadow mask to be mounted at a constant interval therebetween.

Referring to FIG. 1, a commonly used static focus electron gun for a color water tube includes a cathode 10 for dissipating hot electrons and a plurality of grids G1 to G6 sequentially arranged and integrated by the bead glass 12. It is fixed and formed.

The grid includes a triode consisting of a cathode 10, a first grid G1, and a second grid G2, and a third grid G3 for focusing and accelerating hot electrons emitted from the tripole with a predetermined electron beam. ), The fourth grid (G4), the fifth grid (G5), the sixth grid (G6) consisting of a lens unit, the front of the series of convergence cup 11 is a static focus electron gun It is supported so as to be applied to the voltage of the anode.

When a heater (not shown) in the cathode 10 is supplied with a current from the outside and heated, it emits hot electrons. Hot electrons are controlled in a certain amount by the first grid G1, and hot electrons passing through the first grid G1 are focused and accelerated by the second grid G2 and the third grid G3.

In addition, the fifth grid G5 and the sixth grid G6 serving as the third grid G3, the fourth grid G4, and the main lens serving as the pre-focus function are provided. Is accelerated again, and is scanned across the fluorescent surface of the cathode ray tube by the horizontal and vertical deflection magnetic fields of the deflection yoke (not shown) through the convergence cup 20 to form a predetermined screen.

At this time, the deflection yoke mounted outside the neck of the collar tube forms a self-converging magnetic field for the inline static focus electron gun, and automatically lands the R, G, and B beams across the screen. Self-convergence magnetic field, which consists of a pincushion magnetic field and a barrel magnetic field which is a vertical deflection field, forms a bipolar 4-principal magnetic field so that astigmatism occurs due to the horizontal divergence and the vertical focusing force. This becomes horizontal.

Accordingly, the focus characteristic is good in the center of the screen due to the self-converging magnetic field of the deflection yoke, but the resolution is deteriorated because the spot is distorted due to the astigmatism toward the periphery of the screen and is divided into core and hollow components. There is this.

2 is a structural diagram showing an arrangement of a quadrupole electrode. In FIG. 2, an in-line type static focusing system composed of a plurality of grids G1 to G6 and focusing and accelerating R, G, and B electron beams using the fifth grid G5 and the sixth grid G6 as main lenses. Applies to electron guns. The sixth grid G6 is divided into two grids G61 and G62, and between the grids G61 and G62, the first electrode body 31 and the second electrode body 32 are formed. The quadrupole electrode 30 constituted is provided. The spacing between the first electrode body 31 and the second electrode body 32 is about 1 mm. A predetermined voltage is applied to the first electrode body 31 and the second electrode body 32, respectively, and a focus constant voltage is applied to the first electrode body 31 and a focus constant voltage is applied to the second electrode body 32. do. The focus dynamic (dynamic) voltage is parabolic in accordance with the deflection current of the deflection yoke.

However, in recent years, as the color receiving tube is enlarged and the optical deflection angle is increased, the deterioration of the focus characteristic, which is further exacerbated by the above-described deformation structure, cannot be compensated for, and thus the resolution is deteriorated. That is, the above-described G5 and G6 plate hole structures have a disadvantage in that the relative spot sizes of the three electron beams cannot be adjusted.

Therefore, the present invention provides a stay of the flange portion of the main lens G-beam through-hole cathode ray tube which can adjust the size of the spot of the G electron beam to the size of the spot of the R and B electron beams in the inline type static focus electron gun for the color receiver tube. The purpose is to provide a tic focus electron gun.

1 is a structural diagram showing the basic configuration of the static focus electron gun for color water pipes,

2 is a schematic cross-sectional structure diagram showing the configuration of the main lens;

3 is a structural diagram of the large-diameter shape of the G5 and G6 electrodes according to the present invention,

4 is a cross-sectional view of FIG.

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

10: cathode 11: convergence cup

12: Bead glass G1: first grid

G2: second grid G3: third grid

G4: fourth grid G5: fifth grid

G6: 6th grid 31, 31 ', 32, 32': (separated) side wall part

In order to achieve the above object, the present invention is composed of a plurality of grids, and the static focus type electron gun focusing and accelerating the R, G, B electron beams using the fifth and sixth grids as the main lenses: G electron beams. A pair of sidewall portions in which the through holes are symmetrically horizontally and vertically are formed, respectively, to have a sidewall effect, thereby adjusting the spot size of the G electron beam. Provides a focused electron gun.

It is effective for press working that each pair of side wall parts consist of separate flanges formed by cutting in diagonal directions.

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

3 shows a structural diagram of large diameter shapes of the G5 and G6 electrodes according to the present invention.

In FIG. 3, the G5 and G6 plate electrodes, which are the main electrodes of the static focus electron gun, have a sidewall effect. The pair of sidewalls 31 of which the G electron beam passing holes G are symmetrically horizontally and vertically have a sidewall effect. , 31 ', 32, 32') are formed respectively.

As described above, the pair of side wall portions 31, 31 ', 32, and 32' passes through the central G electron beam passing hole G along the length of the side wall portions 31, 31 ', 32, and 32' to the screen. The spot size to be formed can be adjusted.

As shown in FIG. 4, the pair of side wall portions 31, 31 ′, 32, and 32 ′ are formed by cutting in diagonal directions, respectively, to form flanges separated from each other to form a flanging process in a press process. It can be easily formed by.

In the static focus electron gun, which 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 main lenses: The pair of side wall portions 31, 31 ′, 32, and 32 ′ described above are formed vertically and horizontally in the G electron beam through hole G in the center of the fifth grid G5 or the sixth grid G6. By having the effect, the spot size on the screen of the surrounding R and B electron beams can be adjusted, and further, the phenomenon of deterioration in focus characteristics, which is worsened as the color receiving tube is enlarged and light deflected, can be compensated.

As described above, according to the static focus electron gun of the G-beam through hole cathode ray tube of the flange of the main lens of the present invention, the G electron beam passes through the center of the fifth grid G5 or the sixth grid G6. By forming the sidewall portions 31, 31 ', 32, 32' up and down, left and right in the ball G, the center G electron beam can be adjusted with respect to the surrounding R and B electron beams in the spot size on the screen. Increasing the size and light deflection angle also has the effect of preventing deterioration of resolution characteristics.

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 a static focus 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: G A pair of sidewall portions in which the electron beam passing holes are symmetrically horizontally and vertically are formed respectively to have a sidewall effect to adjust the spot size of the G electron beam. Electron gun. The static focus electron gun of claim 1, wherein each of the pair of side walls comprises a separate flange formed by cutting in a diagonal direction.