KR200160136Y1 - Electron gun of cathode ray tube - Google Patents

Abstract

The present invention provides a dynamic electron gun of the cathode ray tube of the central electron beam through hole flange portion of the main lens.

The dynamic electron gun of the cathode ray tube of the central electron beam through-hole flange portion of the main lens is composed of a plurality of grid electrodes, and focuses and accelerates the R, G, and B electron beams using the fifth and sixth grids as the main lenses. WHEREIN: The width | variety W2 of the electron beam through hole of the G51 and G52 electrodes of a 5th grid is larger than the width W1 in the surrounding R and B electron beam through hole.

As a result, the quadrupole effect is strongly applied to prevent deterioration of the resolution characteristic even in the case of enlargement and optical deflection angle.

Description

Dynamic electron gun of the cathode ray tube of the center electron beam through hole of the main lens

The present invention relates to a dynamic electron gun of a cathode ray tube of a flange portion of a central electron beam through hole of a main lens. Specifically, an inline dynamic electron gun has a quadrupole effect on an electron beam to increase the parabolic voltage, thereby increasing the convergence value of the main lens. A dynamic electron gun of a cathode ray tube of a central electron beam through hole flange portion of a lens.

In general, the color receiving tube is a bulb type in which a fluorescent film is applied to the front screen and a dynamic electron gun is accommodated in the rear neck portion. The R, G, B electron beam emitted from the dynamic electron gun of the neck portion maintains a constant distance from the screen. It passes through the fine holes of the shadow mask to be mounted and collides with the fluorescent film to form a screen.

Referring to FIG. 1, a commonly used dynamic electron gun for a color water tube includes a cathode 10 for dissipating hot electrons and a plurality of grids G1 to G6 arranged sequentially and fixed integrally by a bead glass 12. Is 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, in the forefront of the series of grids, the convergence cup 11 supports the dynamic electron gun to the funnel It is installed so that the voltage of the anode is applied.

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 pre-focus functions such as the third grid G3, the fourth grid G4, and the main lens 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-convergence magnetic field for the in-line dynamic electron gun and automatically lands the R, G, and B electron beams across the screen. The self-convergence 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 astigmatism occurs due to the horizontal divergence and the vertical focusing force. do.

Accordingly, the focus characteristic is good in the center of the screen due to the self-converging magnetic field of the deflection yoke. There is this.

2 is a structural diagram showing an arrangement of a quadrupole electrode. In FIG. 2, a plurality of grids G1 to G6 are applied, and the fifth and sixth grids G6 and G6 are used as main lenses, and are applied to an inline type dynamic electron gun that focuses and accelerates an R, G, and B electron beam. do. The sixth grid G6 is formed of grids G61 and G62 divided into two parts, and is composed of a first electrode body 31 and a second electrode body 32 between the grids G61 and G62. Four-pole electrode 30 is provided. The spacing between the first electrode body 31 and the second electrode body 32 is about 1 mm. A small voltage is applied to the first electrode body 31 and the second electrode body 32, respectively, and a focus dynamic voltage is applied to the first electrode body 31, and a focus constant voltage is applied to the second electrode body 32. FIG. do. The focus lamp (dynamic) voltage is parabolic in response to the deflection current of the deflection yoke.

3 illustrates a large diameter shape 30 of the G5 and G6 electrodes of FIG. 2 to solve the above problem.

However, in recent years, as the color receiving tube is enlarged and optically deflected, the deterioration of the focus characteristic, which is more severe with the above-described deformation structure, cannot be compensated for, and even when the main lens is large in diameter as shown in FIG. In this case, the quadrupole effect on the electron beam is increased by reducing the width W. However, when the parabolic voltage is increased due to the short lens length, the convergence value is greatly changed.

Therefore, the present invention provides a dynamic electron gun of the cathode ray tube of the central electron beam through-hole flange portion of the main lens in which the convergence value does not change even if the parabolic voltage is increased by increasing the quadrupole effect on the electron beam in the in-line dynamic electron gun for the color receiving tube. Its purpose is to.

1 is a structural diagram showing a basic configuration of a dynamic electron gun for a color receiver.

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

3 is a structural diagram of various large diameter shapes of the G5 and G6 electrodes of FIG.

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

5 is a cross-sectional view taken along the line 5-5 of FIG.

<Explanation of symbols on main parts of the drawings>

10: Cathode 11: Convergence Cup

12: Bead glass G1: first grid

G2: second grid G2: third grid

G4: fourth grid G5: fifth grid

G6: 6th Grid 30: Large Diameter

31: central electron beam passing hole 32: surrounding electron beam passing hole

33: side wall part (flange)

In order to achieve this object, the present invention is composed of a plurality of grid electrodes, and focuses and accelerates the R, G, and B electron beams using the fifth grid and the sixth grid as the main lenses. The center electron beam through hole flange of the main lens, wherein the width W2 of the electron beam through hole of the G51 and G52 electrodes is larger than the width W1 from the surrounding R and B electron beam through holes. It provides a dynamic electron gun of a cathode ray tube.

Since the sidewall portions which are symmetrical above and below the center G electron beam passing hole are formed inward, the spot size of the center G electron beam can be easily adjusted.

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

4 is a structural diagram of a large diameter shape of the G51 and G52 electrodes according to the present invention.

In FIG. 4, the main electrodes G51 and G52 plate electrodes of the dynamic electron gun have a width W2 at the center G electron beam through hole larger than a width W1 at the surrounding R, B electron beam through holes.

Further, as shown in Fig. 5, sidewall portions 33 which are symmetrically inwardly formed on the G51 and G52 plate electrodes are formed up and down.

The action of the dynamic electron gun of the cathode ray tube of the central electron beam through hole flange portion of the main lens according to the present invention is as follows.

Namely, in a dynamic 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 the main lens: the G51 And the electron beam through hole of the G52 electrode is formed with a width W2 at the center G electron beam through hole larger than the width W1 at the surrounding R and B electron beam through holes, thereby forming a lens at the center thereof, and thus a G electron beam. The spot size of the surrounding electron beam can be easily adjusted, and the quadrupole effect on the electron beam is increased and the convergence value does not change even when the parabolic voltage is increased.

Further, as shown in Fig. 5, the side wall portions 33, which are symmetrical above and below the center G electron beam through hole, are deeply disposed at the upper and lower portions, so that the quadrupole effect is strongly acted, It can be easily formed by forming or bending.

As described through the above embodiment, according to the dynamic electron gun of the center electron beam through hole flange portion of the main lens of the present invention, the width of the electron beam through hole between the center and the periphery is varied and the side walls are formed up and down in the center to form a quadrupole. The strong effect of the magnetic effect has the effect of preventing deterioration of the resolution characteristics in the enlargement and optical deflection angle.

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 dynamic electron gun composed of a plurality of grid electrodes and focusing and accelerating the R, G, and B electron beams using the fifth and sixth grids as the main lenses, the electron beam passing holes of the G51 and G52 electrodes pass through the center G electron beam passing. A dynamic electron gun of a cathode ray tube of a flange portion of a central electron beam through hole of a main lens, wherein the width W2 in the hole is larger than the width W1 in the surrounding R and B electron beam through holes. The dynamic electron gun of the cathode ray tube of the central electron beam through-hole flange portion of the main lens according to claim 1, wherein sidewalls symmetrical to the upper and lower sides of the central G electron beam through-hole are formed inward.