KR920005235Y1 - In-line type electron gun - Google Patents

Abstract

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Description

Inline Color Water Gun Electron Gun

Figure 1a is a reference diagram showing the electron beam spot shape of the electron gun in a general color receiver, (b) is a reference diagram showing a beam spot shape associated with the pincushion magnetic field, (c) is a beam associated with the barrel magnetic field Reference diagram showing the sport shape.

2 is a cross-sectional structural view of a conventional electron gun.

3 is a reference diagram of an electrode constituting a pre-focus lens in FIG. 2.

4 is a reference diagram showing the shape of a beam spot over the whole of the picture tube screen in a conventional electron gun.

5 is a cross-sectional structural view showing an electron gun of the present invention.

Fig. 6A is a reference diagram showing a quadrupole lens in Fig. 5, and (b) is a cross-sectional structure diagram of (a).

7a, b, c is a reference diagram showing the beam spot shape and the in-line self-convergence magnetic field according to the present invention.

8 is a signal waveform diagram showing a relationship between a deflection current and a dynamic voltage.

9 is a reference diagram showing an electron beam spot shape on a screen according to the present invention.

10 is a reference diagram showing a beam spot shape in the whole screen according to the present invention.

* Explanation of symbols for main parts of the drawings

42,43,44: quadrupole electrode S _1: Lot transverse PLAISANCE

S ₂ : Long throat

The present invention relates to an electron gun of a color receiver, and more particularly, to an inline type color receiver electron gun that can significantly improve the resolution of the screen periphery of the receiver.

In general, the color water pipe is composed of R, G and B beams concentrated all over the screen by in-line self-convergence magnetic field as shown in Fig. 1a. They are composed of two-pole and four-pole components, respectively, as shown in (b) and (c), and the electron beam emitted from the electron gun 1 is mainly deflected in the direction of the broken arrow by the two-pole component and is microscopically four-pole. The components receive magnetic force in the dashed arrow direction and diverge in the horizontal direction and focus in the vertical direction, causing astigmatism in the beam spot, especially at the periphery of the screen.

This is because the imaging planes of the electron beams are different from each other in the vertical and horizontal directions, and the electron beam spots are over-focused in the vertical direction on the fluorescent surface, causing haze to deteriorate the vertical resolution of the water pipe.

Deteriorates vertical resolution.

In addition, the conventional electron gun is formed like a second tile, wherein the cathode 10 emitting the hot electrons to the pair of bead glass, the first to fourth electrodes 11-14 and the shield cup 15 maintain a constant interval. And arranged so that the first electrode 11 controls the amount of electron beam emitted and accelerates it to the second electrode 12 and is connected to the fluorescent surface by the third and fourth electrodes 13 and 14 forming the main lens. It is.

The first electrode 12 and the third electrode bottom 13a constituting the pre-focus lens of the electron gun 1 have three circular electron beam through holes a inline with each electrode as shown in FIG. A voltage VG ₂ of about 260 V is applied to the second electrode 12, and a focus voltage Vf of about 4-7 KV is applied to the third electrode bottom 13a.

The electron beam 2 of the conventional electron gun 1 is crushed as the electron beam is deflected at the center portion of the screen, and the beam spot at the center portion of the screen becomes a power source as shown in FIG. 4, while the beam spot at the peripheral portion is long in the horizontal direction. The shape is accompanied by the elliptical high luminance core portion c and the haze portion H generated in the vertical direction, so that resolution at the periphery of the screen is inevitably degraded.

This distortion of the electron beam spot is because the self-convergence deflection yoke gives a non-uniform magnetic field with respect to the three electron beams as shown in FIG. To compensate for the distortion.

As a means of compensating for such distortion of the peripheral beam spot shape, various methods have been proposed. However, Japanese Unexamined Patent Publication No. 58-192250, which is cited in the present invention, is most prominent. There is a problem that the effect is not complete because it is compensated only by each spot of the.

The present invention has been made to improve the problems as described above better.

In particular, the four-pole lens is composed of three electrodes. Among the electrodes of the four-pole lens, a dynamic focus voltage is applied to the center electrode, and a constant focus voltage is applied to the remaining electrodes. A circular hole is drilled in an inline direction, and an in-line color water pipe electron gun having one horizontal throat on each side of the center electrode and three longitudinal throats on the opposite electrode on the center electrode side.

This will be described in more detail below.

That is, FIG. 5 shows an electron gun for in-line color water pipes according to the present invention.

Here, three cathodes emitting hot electrons, a plurality of electrodes 41-45 and a shield cup 46 are arranged in a row, and although not shown, they are fixed to beadgrass, a rod-shaped electrical insulator, of which 42 The 43,44a electrodes consist of electrodes forming a four-pole lens. In addition, the quadrupole electrodes 42, 43, 44a are perforated in the in-line direction with three circular beam through holes a in each electrode as shown in FIG. 6. Among them, the electrode 43 is surrounded by the circular holes a. One horizontal throat (S ₁ ) is formed on both sides of the electrode 43, and the throat (S ₁ ) has dimensions of 15.5-16.5 mm, 1.0-1.5 mm, and 0.4-0.5 mm in depth. .

In addition, the electrodes 42 and 44a have three longitudinal throats (S ₂ ) formed around the soft hole (a) only on opposite surfaces of the electrode 43 in the direction of 1.0-1.5 mm in width and 3.5-5.5 mm in length. The depth is 0.4-0.5mm.

In the ninth, reference numeral 54 denotes an electrostatic lens formed between the electrodes 44 and 54, and e denotes an electron beam passing through the main lens.

The present invention of this configuration is as follows.

That is, as in the sixth diagram, the electron gun 4 of the present invention employs a quadrupole electrode system 42, 43, 44a, and a focus voltage vf of 4-7 Kv is applied to the electrodes 42, 43, 44a. The electrode 43 is provided with a dynamic focus voltage VDf which varies according to the deflection current P ₁ of the deflection yoke DY as in P ₂ or P ₃ of FIG. 8, and the dynamic voltage is VDF = Vf ± 200 Vpp is applied.

In addition, the electron beam emitted from the cathode passes through the four-pole electrodes 42, 43, and 44a and is affected by the four-pole electrodes 42, 43, and 44a, and is strongly concentrated in the vertical direction, and weakly focused in the horizontal direction. Because it is received, it becomes a horizontal ellipse beam.

In addition, the electrodes 42 and 44a have three longitudinal spots (S ₂ ) formed around the circular hole (a) only on opposite surfaces in the direction of the electrode 43, and the dimensions are 1.0-1.5 mm long and 3.5-5.5 mm long, The depth is 0.4-0.5mm.

Reference numeral 9 denotes an electrostatic lens formed between the electrodes 44 and 45, and e is an electron beam passing through the main lens.

The present invention of this configuration is as follows.

That is, as in the sixth diagram, the electron gun 4 of the present invention employs a quadrupole electrode system 42, 43, 44a, and a 4-6kv war focus voltage Vf is applied to these electrodes 42, 43, 44a. The dynamic focus voltage V _Df , which is changed according to the deflection current P ₁ of the deflection yoke DY, is applied to the electrode 43, such as P ₂ or P ₃ in FIG. 8. ± 200 Vpp is applied.

In addition, the electron beam from the cathode 40 is the four-pole

Claims (1)

In an inline type tube of a color water tube including positive poles of a quadrupole lens and a dynamic voltage and a focus voltage applied to these electrodes, the electrodes of the quadrupole lens have a dynamic focus on the center electrode 43 in a double. A voltage is applied, and a structure in which a constant focus voltage is applied to the remaining electrodes 42 and 44a, and three circular holes a are drilled in the in-line direction to the electrodes 42, 43 and 44a, respectively, and the electrode 43 Inline type water gun electron gun, characterized in that the configuration is provided with one longitudinal throat (S ₁ ) electrode 42, 44a on each side of the three longitudinal throat (S ₂ ).