JPS63200437A - Cathode-ray tube device - Google Patents

Abstract

PURPOSE:To make it possible to perform proper compensation of astigma easily by providing an inline type electron gun inside its focusing electrode with vertical direction control electrodes and a horizontal direction control electrode to form a quadrupole electric field and a means to apply a voltage to compensate astigma between the vertical and horizontal direction control electrodes. CONSTITUTION:An astigma compensating voltage DELTAe is applied between a horizontal direction control electrode 10 and vertical direction control electrodes 9a, 9b. When, for this astigma compensating voltage DELTAe, DELTAe>0, inside the quadrupole lens electrode 11 is formed a quadrupole lens to apply focusing action in the vertical direction and diverging action in the horizontal direction to the electron beams. If DELTAe=0, the horizontal direction control electrode 10 and the vertical direction control electrodes 9a, 9b have the same potential, and a quadrupole lens is not formed. If DELTAe<0, inside the quadrupole lens electrode 11 is formed a quadrupole lens to apply diverging action in the vertical direction and focusing action in the horizontal direction to the electron beam. Thus, by adjusting size of DELTAe depending on the size of the astigma, any astigma can be compensated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube device for correcting astigma in an in-line electron gun.

[Conventional technology]

FIG. 4 is a sectional view showing an example of a conventional in-line sub-gun. In the figure, (11, +21, +3
1 are cathodes arranged in the same direction on a horizontal plane, a control YL pole (4) common to these cathodes, and an accelerating electrode (
5) constitutes the front octupole part. (6) is the focusing electrode, and (7) is the anode 'Iil! It is extreme. (8) is the difference between the vertical focusing action and horizontal focusing action (hereinafter referred to as "astigma") of the electron lens (hereinafter referred to as "main lens") formed between the focusing electrode (6) and anode t[44+71]. This is a plate-shaped plate for correcting the

Next, the operation will be explained. The main lens of the in-line electron gun is arranged horizontally in a straight line for eight beams, so the interaction of the lens electric field also works to increase the strength of the horizontal focusing action and the vertical +M direction focusing action. Because of the difference, the second
As shown in the figure, there is a plate (8) inside the focusing electrode (6).
) is inserted to correct astigma. Typically,
In the case of an in-line electron gun, since the lens focusing effect in the vertical direction is strong, the horizontal direction is The lens has a strong focusing effect to correct this astigma.

[Problem that the invention seeks to solve]

The in-line electron gun of the conventional cathode ray tube device has a plate for astigma correction as described above.1 This astigma consists of a focusing electrode +61. Anode chamber 4”1M (
71 (due to lot-to-lot variation, assembly precision, etc.). Therefore, according to the fluctuation, the plate (8)
The problem is that it is difficult to properly correct astigma because the dimensions of the plate (8) must be designed, and the amount of correction changes due to variations in the assembly accuracy of the plate (8) and dimensions between lots. There was a point.

This invention was made in order to solve the above-mentioned problems, and even if the υ astigma changes due to variations in the dimensions between lots of the focusing electrode and the anode 1, and variations in assembly accuracy, The object of the present invention is to obtain a cathode ray tube device equipped with an in-line electron gun that can easily make appropriate corrections in accordance with the astigma.

[Means for Solving the Problems] The cathode ray tube device according to the present invention has an in-line type electron gun focusing! It is equipped with a vertical control electrode that forms a quadrupole electric field within the pole, a horizontal control tJtwi, and a means for applying an astigma correction voltage between the vertical and horizontal control tWi. The vertical control electrode provided in the infin type electron gun focusing electrode in the invention is kept at the same potential as the focusing electrode, and the horizontal control electrode is connected to the focusing electrode by an astigma correction voltage applying means. Different potentials are applied to form a quadrupolar electric field between the vertical control electrode and the horizontal control electrode, and by adjusting the applied potential difference to an appropriate value,
Astigma is corrected.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

8. In FIG. 1, the same reference numerals as in FIG. 4 indicate the same components. (6a) t (6b) is a focusing electrode divided into two in the tube axis direction, (9a) * (9
b) are vertical control electrodes that are connected to the focusing electrodes (6a) and (6b), respectively, and are configured to sandwich the electron beam from above and below, and (io) are horizontal control electrodes that are configured to sandwich the electron beam from the left and right. The control electrodes include vertical control electrodes (9a) t (9b) and horizontal control electrodes (1
0) constitutes a quadrupole lens electrode (11) forming a quadrupole lens. (12) is the focusing chamber where the focusing voltage E is applied @
(6a) t (6b) and the horizontal control electrode (
10) is a variable voltage power supply that applies an astigma correction voltage Δe between the two.

Next, the operation of this embodiment will be explained.

As shown in FIG. 1, an astigma correction voltage Δe is applied between the horizontal control electrode (10) and the vertical control electrode (9a) t (9b). When this astigma correction voltage Δe is je>0, the quadrupole V lens electrode (11
) has a focusing effect on the electron beam in the vertical direction,
A quadrupole lens with a diverging effect is formed in the horizontal direction.

When Δe=Q, the horizontal control electrode (10) and the vertical control electrodes (9a), (9b) are at the same potential, and no quadrupole lens is formed. When je<0, a quadrupole lens is formed in the quadrupole lens electrode (11) that has a diverging effect in the vertical direction and a focusing effect in the horizontal direction with respect to the electron beam.

Therefore, if the astigma is positive, where the horizontal focusing action of the main lens formed between the focusing tFM (6a) and the anode (7) is stronger than the vertical controlling action, then je>0 and the a If stigma is 00, Δe=o
If the horizontal focusing effect is weaker than the vertical controlling effect and the astigma is negative, then if we set je(0 and adjust the size of je according to the size of the astigma, then what kind of Astigma can also be corrected, and it is also possible to set the size of astigma to a desired size, taking into account deflection aberrations and the like.

In the above embodiment, the horizontal direction control '1 has a pole (10).
, and the vertical direction control electrodes (9a), s (9b), respectively, are arranged in the tube axis direction to form the quadrupole lens electrode (11). As shown in the figure, even if each element is composed of one bare piece, the sensitivity will be lower but the effect will be the same.

Further, the electrode pieces constituting the quadrupole lens electrode (11) are not limited to a flat plate shape, and the cross-sectional shape of the plane perpendicular to the tube axis may be circular, oval, parabolic, hyperbolic, or a combination of these. It can be anything.

〔Effect of the invention〕

As described above, according to the present invention, the vertical control electrodes arranged in the focusing electrode of the in-line electron gun sandwich the electron beam from above and below, and the horizontal control electrodes sandwich the electron beam from the left and right sides. Since it is equipped with a quadrupole lens electrode and a means for applying an astigma correction voltage between the quadrupole lens electrodes, the difference between the vertical focusing action and the horizontal focusing action of the main lens formed between the anode electrode and the focusing electrode can be corrected. This provides an effect that can be adjusted freely.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an electron gun showing one embodiment of the present invention, FIGS. 2 and 8 are cross-sectional views showing main parts of other embodiments of the invention, and FIG. 4 is a conventional electron gun. FIG. 2 is a cross-sectional view of an in-line electron gun. (6a) * (6b) ... Focus! , pole, +7
1 - Anode, (9a) + (9b) Vertical control electrode, (10) Horizontal control electrode, (1
1)... Quadrupole lens 'i4. Pole, (12)... Astigma correction voltage power supply, (20)... Intwin type spring gun. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) It is arranged between the focusing electrodes that are divided into two in the tube axis direction, and each consists of a vertical control electrode that sandwiches the electron beam from above and below, and a horizontal control electrode that sandwiches the electron beam from the left and right. A cathode ray tube device comprising: an in-line electron gun having a quadrupole lens electrode; and a power source for applying an astigma correction voltage between the vertical and horizontal electrodes.