KR0144204B1 - Inline electron gun for cathode ray tube - Google Patents

Abstract

The present invention relates to an inline electron gun for a cathode ray tube, and in particular, to satisfy both astigmatism and positive convergence without the addition of a complex correction electrode.

A control means formed to control positive conversion on the outer electrodes of both side beams, and a plate electrode surrounding each of the electron beams to adjust astigmatism by retreating at a predetermined interval from the rim portion where the main focusing electrode and the acceleration electrode face each other. It is equipped.

Description

Inline electron gun for cathode ray tube

1 is a cross-sectional view of a color-brown tube equipped with a general tank gun.

2 is a partially broken perspective view of a conventional large-diameter main lens electrode.

3 is a partially broken perspective view of the main lens electrode of the inline electron gun according to the present invention;

4 is a sectional view of principal parts of an asymmetric main lens according to the present invention;

5 is an electron beam state diagram of the main lens unit of the present invention.

6 is a configuration diagram of another embodiment of the present invention.

7 is a perspective view of another embodiment bankruptcy of the present invention

8 is a cross-sectional view of another embodiment of the present invention.

9 is an electron beam state diagram according to another embodiment of the present invention.

10 is a block diagram of another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

106: main focusing electrode 107: acceleration electrode

120, 122: plate electrode 121: opening

121 ': main electrode main body 123, 124, 125: electron beam

128, 130: low potential electrode 129: high potential electrode

The present invention relates to an inline tank gun for a cathode ray tube, and in particular, to form a shape of a main focusing lens that can satisfy astigmatism and static convergence simultaneously with a simple structure without additional parts of an electrode constituting the main lens. It is.

Each electrode of the conventional inline tank gun is the first electrode 4 which is a common lattice of three cathodes 3 which are independent of each other, as shown in FIGS. And the second electrode 5 arranged at a predetermined distance from the first electrode 4, and the third electrode 6 and the fourth electrode 7 in that order, and the fourth nation 7. A shielding member 8 is formed on the upper portion of the shield member 8, and different voltages are supplied to the cathodes so as to obtain a constant current value for the cut-off voltage of each electron gun to be the same. In addition, when the heater 2 built in the cathode 3 receives power from the stem pin 1 and generates heat, electrons are emitted from the cathode 3 by this heat. The beam is controlled by the first electrode 4 and the beam is accelerated by the second electrode 5 which is the acceleration electrode, and the fluorescent surface 11 passes through the main focusing electrode 6 and the acceleration electrode 7 which are the main lens forming electrodes. ) And emit light.

In addition, the main focusing electrode 6 and the accelerating electrode 7 for forming the main focusing lens are common to the three R, G, and B beams, and the same amount of the main focusing electrode 6 and the accelerating electrode 7 is constant. It has a shape (burring) 18, which is rolled in parallel with the outer periphery inward, and has race track-shaped rims 19 and 26 facing each other, and at a certain distance from the rims 19 and 26. The central hole has an elliptic opening, and the side balls on both sides have plate-shaped electrodes 15 and 16 in which elliptic openings are cut in half so that the portions in contact with the outer circumferential wall at both left and right ends thereof are removed. When the characteristic satisfaction is not achieved only by the oval opening, a pair of shade-shaped correction electrodes 17 are added on the shielding member 8 in parallel with the arrangement direction of the electron beam.

In the conventional tank gun configured as described above, the main lens through which three electron beams pass is formed by the potential difference between the main focusing electrode 6 and the acceleration electrode 7, and the main lens has three electron beams having the same amount of burring 18. One main lens in common is formed.

In addition, since the main lens common to the three electron beams has a stronger influence of the vertical focusing / acceleration electrode than the horizontal focusing / acceleration electric field, the shape of the three electron beams after the main lens passes is longer than the vertical. Indicates. Therefore, the plate-shaped electrodes 15, 16 having elliptical balls whose vertical diameter, which compensates for the horizontalization phenomenon of the electron beam, are receded at a predetermined interval on the rims 19, 26 by the main focusing electrode. By disposing at (6) and the acceleration electrode (7), the lateralization phenomenon of the electron beam was compensated.

This main lens structure can obtain the focusing force (constant convergence) to the center beam of the side beam itself, which is a feature that is important for the side beam by retreating the plate electrodes 15 and 16.

However, the plate-shaped electrode with the elliptical opening alone has a restriction on the shape change that can satisfy the convergence difference between the horizontal beam and the vertical beam and the positive convergence at the same time, which greatly affects the astigmatism. A pair of low-shape correction electrodes 17 are disposed to satisfy both astigmatism and positive convergence of the side beam at the same time.

Another way to achieve positive convergence is to create an electron beam that is parallel to each other, focusing them on a main stove composed of non-symmetrical symmetry and concentrating each beam at a point on the fluorescent surface by giving them the desired concentration. It is.

For example, in an inline electron gun which generates three electron beams parallel to each other on a common plane, the central axis of the high potential electrode among the counter electrodes constituting two sets of main lenses focusing two electron beams arranged on the outside The non-axisymmetric lens is realized by shifting the outer side with respect to the center side of the low potential side electrode. An axisymmetric lens is used to focus the center beam, so that the center beam goes straight along the axis, while the outer beam is the central axis of the diverging lens formed inside the high potential electrode and passes through the deflected portion in the direction of the center beam. Therefore, under the same concentration, the three electron beams are concentrated on a point on the fluorescent surface.

However, this conventional technique is limited in the design of the retraction amount of the plate electrodes (15) and (16), and thus, the components of the complex shape are provided by disposing the correction electrode (17) under the shield member (8) to compensate for astigmatism. There was an issue added.

Then, by shifting the central axis of the high potential side electrode of the counterelectrode, which constitutes two sets of main lenses that focus on two electron beams arranged outside, to the outside of the center of the low true side electrode, the electron gun realizes a non-axisymmetric lens. Since the electrodes constituting the two main stoves on the outer side are not the same side, the electrode assembly requires a special assembling jig having a partially non-coaxial shape, and has the drawback that the complexity and accuracy of the assembly work are caused.

In addition, in order to bias the center side of the diverging lens in the outer main lens, it is necessary to increase the inner diameter of the high potential electrode or reduce the inner diameter of the low potential electrode, but in the former means, the outer diameter increases after the electrode combination. Therefore, there is a problem in that the increase in the deflection power due to the increase in the wonder of the crown head, the spherical aberration increases in the latter means, resulting in degradation of the resolution.

In view of the above, the present invention provides a control means formed to control positive conversion on the outer electrodes of both side beams, and the main focusing electrode and the accelerating electrode are retracted by a predetermined interval from each other to adjust the astigmatism. By providing a plate electrode surrounding the electron beam, the assembly is easy and the purpose is to be able to satisfy the astigmatism and the positive conversion at the same time in the shape having a number of design elements without the addition of parts.

The invention is illustrated by FIGS. 3 to 10.

The three cathodes 103, the first electrode 104, the second electrode 105, the main focusing electrode 106, and the acceleration electrode 107, which are common grids of the cathode 103, are configured in this order. The shielding agent 108 attached to the upper part of the fourth national body 107, the burring 118 formed inwardly of the main focusing electrode 106 and the acceleration electrode 107, and the rim portion 119 having a race track shape. In the inline tank gun composed of (126), the opening means 121 formed on the outer circumferential wall end side of the acceleration electrode 107 as a control means formed to adjust the positive conversion on the outer electrodes of both side beams, The main focusing electrode 106 and the acceleration electrode 107 are provided with plate electrodes 120 and 122 surrounding each of the electron beams so as to retreat a predetermined distance from the rims 119 and 126 facing each other to adjust astigmatism. It was.

In another embodiment, the regulating means is provided with a through-electrode recess 121 'in the inner side of the outer wall at a short side of the outer peripheral wall of the main focusing electrode 106.

In another embodiment, the two electrodes of the high potential electrode 107 and the potential potential electrode 106 are not limited to the so-called bipotential lenses constituting the main lens, and the high potential electrodes 129 and 107 and the low potential electrode are formed. The same applies to the biunipotential lens constituted by the four electrodes of (128) and (130).

Reference numerals 123, 124, and 125 denote electronic beams.

According to the embodiment of the present invention configured as described above, in order to satisfy both the astigmatism and the positive convergence of the main lens formed by the potential difference between the main focusing electrode 106 and the acceleration electrode 107 in FIGS. The reinforcement phenomenon of the vertical focusing force by 119 and 126 is retracted by a predetermined interval, and the opening 121 is formed at the short side of the outer circumferential wall of the acceleration electrode 107 at a position short of the plate electrode 120 having the opening. Satisfy Convergence

4 shows a case where the electrodes constituting the main lens for focusing each beam are independent and are not integrated. The penetration of the low potential is suppressed in the portion where the plate electrode 120 of the acceleration electrode 107 is installed, and since the high potential does not work where the opening 121 is installed, the penetration of the low potential by the main focusing electrode is performed. Since the equipotential lines are moved in the direction in which the openings are located, equipotential lines having a shape as shown in the drawing are formed.

By this electric field, the electron beam is focused and deflected in the alain direction.

In FIG. 5, three main lenses focusing three electron beams 123, 124 and 125 are formed in each beam passing hole between the electrodes 106 and 107. In FIG. In order to form the main focusing lens for converging the center beam 124 in the form of axisymmetry, the plate-shaped electrode 120 having a rectangular opening is disposed at a position where the race track-shaped rim portion 126 has been retracted by a certain distance. Beam 124 goes straight.

Since the outside beam takes positive conversion, it is concentrated inward in the center beam direction by the opening 121 of the acceleration electrode 107. At this time, the installation position of the opening 121 has a condition for concentrating the beam inside. The three electron beams focus on one point when the distance between the center axis of the electron gun and the center side of the electron gun that concentrates the outer beam coincides with the deflection of the side beam.

In another embodiment, the penetration of the high potential is strongly suppressed at the portion where the main electrode recess 121 ′ of the main focusing electrode 106 is installed, as shown in FIGS. 7 to 9. Is formed. The electron beam is focused and deflected downward by the electric field, and the position of the main electrode recess 121 'can be adjusted to satisfy the condition for concentrating the beam inside.

In another embodiment, as shown in FIGS. 6 and 10, high potential electrodes are disposed on both sides of the low potential electrode, and the so-called unipotential lens composed of three electrodes, and again on the cathode side of the unipotential lens The low potential electrode can be added to the biunipotential lens composed of four electrodes.

The present invention as described above is an easy invention that can satisfy the constant convergence and non-aberration at the same time without the addition of parts while simplifying the design and assembly of the electrode.

Claims (7)

Control means formed to control the positive conversion on the outer electrodes of both side beams, and a plate electrode surrounding each of the electron beams to adjust the astigmatism by retreating a predetermined interval on the rim facing the main focusing electrode and the acceleration electrode Inline electron gun for cathode ray tube, characterized in that provided with The inline electron gun for cathode ray tubes according to claim 1, wherein the adjusting means has an opening at an end portion of the outer peripheral wall of the acceleration electrode. 2. The inline electron gun for cathode ray tube according to claim 1, wherein the adjusting means has a through-electrode recess in the inner circumferential wall of the outer circumferential wall short side of the main focusing electrode. The in-line electron gun for cathode ray tubes according to claim 2, wherein the opening portion is provided between the rim portion of the acceleration electrode and the rectangular plate electrode. The in-line electron gun for cathode ray tubes according to claim 2, wherein the opening portion is provided between the plate-shaped electrode of the acceleration electrode and the shielding member. 4. The inline electron gun for cathode ray tube according to claim 3, wherein the main electrode main portion is provided between the opening of the main focusing electrode and the plate-shaped electrode. The in-line electron gun for cathode ray tubes according to claim 3, wherein the through-electrode main portion is provided in the cathode side direction from the plate-shaped electrode of the main focusing electrode.